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Hydraulics and Fluid Mechanics MCQ Questions & Answers

Hydraulics and Fluid Mechanics MCQs : This section focuses on the "Hydraulics and Fluid Mechanics". These Multiple Choice Questions (MCQs) should be practiced to improve the Hydraulics and Fluid Mechanics skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

When a tube of smaller diameter is dipped in water, the water rises in the tube due to viscosity of water.

A. TRUE
B. FALSE

View Answer

Question 2

The viscosity of a gas

A. decreases with increase in temperature
B. increases with increase in temperature
C. is independent of temperature
D. is independent of pressure for very high pressure intensities

View Answer

Question 3

The rise or depression of liquid in a tube due to surface tension wim increase in size of tube will

A. increase
B. remain unaffected
C. may increase or decrease depending on the characteristics of liquid
D. decrease

View Answer

Question 4

The kinematic viscosity is the

A. ratio of absolute viscosity to the density of the liquid
B. ratio of density of the liquid to the absolute viscosity
C. product of absolute viscosity and density of the liquid
D. product of absolute viscosity and mass of the liquid

View Answer

Question 5

Coefficient of velocity for Borda’s mouth piece running full is

A. 0.611
B. 0.707
C. 0.855
D. 1

View Answer

Question 6

Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by

A. 5%
B. 10%
C. 15%
D. 20%

View Answer

Question 7

Metacentre is the point of intersection of

A. vertical upward force through e.g. of body and center line of body
B. buoyant force and the center line of body
C. mid point between e.g. and center of buoyancy
D. all of the above

View Answer

Question 8

The equation of continuity holds good when the flow

A. is steady
B. is one dimensional
C. velocity is uniform at all the cross sec-tions
D. all of the above

View Answer

Question 9

Stanton diagram is a

A. log-log plot of friction factor against Reynolds number
B. log-log plot of relative roughness against Reynolds number
C. semi-log plot of friction factor against Reynolds number
D. semi-log plot of friction factor against relative roughness

View Answer

Question 10

If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be

A. from reservoir A to reservoirs B and C
B. from reservoir B to reservoirs C and A
C. from reservoir C to reservoirs A and B
D. unpredictable

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Question 11

An ideal flow of any fluid must satisfy

A. Pascal law
B. Newton’s law of viscosity
C. boundary layer theory
D. continuity equation

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Question 12

Ay between two stream lines represents

A. velocity
B. discharge
C. head
D. pressure

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Question 13

A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be

A. 1 m
B. 10m
C. 100m
D. none of the above

View Answer

Question 14

Which of the following is used to measure the discharge ?

A. current meter
B. venturimeter
C. pitot tube
D. hotwire anemometer

View Answer

Question 15

A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid, and H = Height of liquid)

A. wH
B. wH/2
C. wH2/2
D. wH2/3

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Question 16

The density of water is 1000 kg/m3 at

A. 0°C
B. 0°K
C. 4°C
D. 20°C

View Answer

Question 17

Uniform flow occurs when

A. the flow is steady
B. the flow is streamline
C. size and shape of the cross section in a particular length remain constant
D. size and cross section change uniformly along length

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Question 18

The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is

A. constant over the cross section
B. parabolic distribution across the section
C. zero at the mid plane and varies linearly with distance from mid plane
D. zero at plates and increases linearly to midpoint

View Answer

Question 19

One litre of water occupies a volume of

A. 100 cm3
B. 250 cm3
C. 500 cm3
D. 1000 cm3

View Answer

Question 20

A fluid of kinematic viscosity 0.4 cm²/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be

A. less than 1 m/sec
B. 1 m/sec
C. 1.5 m/sec
D. 2 m/sec

View Answer

Question 21

An error of 1% in measuring head over the apex of the notch (H) will produce an error of __________ in discharge over a triangular notch.

A. 1%
B. 1.50%
C. 2%
D. 2.50%

View Answer

Question 22

Stream lines and path lines always coincide in case of

A. steady flow
B. laminar flow
C. uniform flow
D. turbulent flow

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Question 23

The discharge over a right angled notch is (where H = Height of liquid above the apex of notch)

A. Cd 2g x H
B. Cd 2g x H3/2
C. Cd 2g x H2
D. Cd 2g x H5/2

View Answer

Question 24

Coefficient of contraction for an external cylindrical mouthpiece is

A. 1
B. 0.855
C. 0.7H
D. 0.611

View Answer

Question 25

A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?

A. 0.5
B. 0.4
C. 0.515
D. 0.5

View Answer

Question 26

The horizontal component of force on a curved surface is equal to the

A. product of pressure intensity at its centroid and area
B. force on a vertical projection of the curved surface
C. weight of liquid vertically above the curved surface
D. force on the horizontal projection of the curved surface

View Answer

Question 27

Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is

A. less than d
B. between d and 1.5 d
C. between 1.5 d and 2d
D. greater than 2d

View Answer

Question 28

According to Bernoulli’s equation for steady ideal fluid flow

A. principle of conservation of mass holds
B. velocity and pressure are inversely proportional
C. total energy is constant throughout
D. the energy is constant along a stream-line but may vary across streamlines

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Question 29

The maximum discharge over a broad crested weir is

A. 0.384 Cd x L x H1/2
B. 0.384 Cd x L x H3/2
C. 1.71 Cd x L x H1/2
D. 1.71 Cd x L x H3/2

View Answer

Question 30

All the terms of energy in Bernoulli’s equation have dimension of

A. energy
B. work
C. mass
D. length

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Question 31

The motion of air mass in a tornado is a

A. free vortex motion
B. forced vortex motion
C. free vortex at center and forced vortex outside
D. forced vortex at center and free vortex outside

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Question 32

The hydraulic grade line is

A. always above the centre line of pipe
B. never above the energy grade line
C. always sloping downward in the direction of flow
D. all of the above

View Answer

Question 33

Barometer is used to measure

A. pressure in pipes, channels etc
B. atmospheric pressure
C. very low pressure
D. difference of pressure between two points

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Question 34

A metal with specific gravity of o floating in a fluid of same specific gravity a will

A. sink to bottom
B. float over fluid
C. partly immersed
D. be fully immersed with top surface at fluid surface

View Answer

Question 35

The unit of kinematic viscosity is

A. gm/cm-sec²
B. dyne-sec/cm²
C. gm/cm²-sec
D. cm²/sec

View Answer

Question 36

The velocity distribution for laminar flow through a circular tube

A. is constant over the cross-section
B. varies linearly from zero at walls to maximum at centre
C. varies parabolically with maximum at the centre
D. none of the above

View Answer

Question 37

The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm”. The pressure at 2.5 m below the oil surface will be

A. 2 meters of water column
B. 3 meters of water column
C. 3.5 meters of water column
D. 4 m of water column

View Answer

Question 38

Surge wave in a rectangular channel is an example ofi) steady flowii) unsteady flowiii) uniform flowiv) non-uniform flowThe correct answer is

A. (i) and (iii)
B. (ii) and (iii)
C. (i) and (iv)
D. (ii) and (iv)

View Answer

Question 39

Coefficient of velocity of venturimeter

A. is independent of Reynolds number
B. decreases with higher Reynolds number
C. is equal to the coefficient of discharge of venturimeter
D. none of the above

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Question 40

A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water ?

A. 10 m/sec
B. 25 m/sec
C. 2 m/sec
D. 50 m/sec

View Answer

Question 41

When a body floating in a liquid, is displaced slightly, it oscillates about

A. e.g. of body
B. center of pressure
C. center of buoyancy
D. metacentre

View Answer

Question 42

An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The intensity of pressure at the bottom of tank will be

A. 4 kN/m2
B. 10 kN/m2
C. 12 kN/m2
D. 14 kN/m2

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Question 43

Size of a venturimeter is specified by

A. pipe diameter
B. throat diameter
C. angle of diverging section
D. both pipe diameter as well as throat diameter

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Question 44

Hot wire anemometer is used to measure

A. discharge
B. velocity of gas
C. pressure intensity of gas
D. pressure intensity of liquid

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Question 45

Newton’s law of viscosity is a relationship between

A. shear stress anctthejiate of angular distortion
B. shear stress and viscosity
C. shear stress, velocity and viscosity
D. pressure, velocity and viscosity

View Answer

Question 46

The value of friction factor ‘f’ for smooth pipes for Reynolds number 106 is approximately equal to

A. 0.1
B. 0.01
C. 0.001
D. 0.0001

View Answer

Question 47

Which of the following manometer has highest sensitivity

A. U-tube with water
B. inclined U-tube
C. U-tube with mercury
D. micro-manometer with water

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Question 48

Flow of water in a pipe about 3 meters in diameter can be measured by

A. orifice plate
B. venturi
C. rotameter
D. pitot tube

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Question 49

True one-dimensional flow occurs when

A. the direction and magnitude of the veiocity at all points are identical
B. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
C. the magnitude and direction of the velocity do not change from point to point in the fluid
D. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

View Answer

Question 50

The units of viscosity are

A. metre2/sec
B. kg sec/metre
C. newton-sec/metre2
D. newton-sec/metre

View Answer

Question 51

The value of mass density in kgsecVm4 for water at 0°C is

A. 1
B. 1000
C. 100
D. 101.9

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Question 52

Choose the wrong statement.Alcohol is used in manometer, because

A. its vapour pressure is low
B. it provides suitable meniscus for the inclined tube
C. its density is less
D. it provides longer length for a given pressure difference

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Question 53

The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is

A. at the centroid of the submerged area
B. always above the centroid of the area
C. always below the centroid of the area
D. none of the above

View Answer

Question 54

An ideal flow of any fluid must fulfill the following

A. Newton’s law of motion
B. Newton’s law of viscosity
C. Pascal’ law
D. Continuity equation

View Answer

Question 55

Centre of buoyancy always

A. coincides with the centre of gravity
B. coincides with the centroid of the volume of fluid displaced
C. remains above the centre of gravity
D. remains below the centre of gravity

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Question 56

Liquids transmit pressure equally in all the directions. This is according to

A. Boyle’s law
B. Archimedes principle
C. Pascal’s law
D. Newton’s formula

View Answer

Question 57

An object having 10 kg mass weighs 9.81kg on a spring balance. The value of ‘g’ at this place is

A. 10m/sec²
B. 9.81 m/sec²
C. 10.2/m sec
D. 9.75 m/sec²

View Answer

Question 58

If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm”, the pressure at a depth of 50 m below the oil surface will be

A. 2 meters of water column
B. 3 meters of water column
C. 5 meters of water column
D. 6 meters of water Column

View Answer

Question 59

In open channels, the specific energy is the

A. total energy per unit discharge
B. total energy measured with respect to the datum passing through the bottom of the channel
C. total energy measured above the horizontal datum
D. kinetic energy plotted above the free surface of water

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Question 60

Pitot tube is used for measurement of

A. pressure
B. flow
C. velocity
D. dsscharge

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Question 61

For laminar flow in circular pipes, the Darcy’s friction factor f is equal to

A. 16/Re
B. 32/ Re
C. 64/ Re
D. none of the above where Re is Reynolds number.

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Question 62

Kinematic viscosity is equal to

A. dynamic viscosity/density
B. dynamicviscosity x density
C. density/dynamic viscosity
D. 1/dynamicviscosity x density

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Question 63

Choose the wrong statement

A. Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force
B. Viscosity is due primarily to interaction between fluid molecules
C. Viscosity of liquids decreases with in-crease in temperature
D. Viscosity of liquids is appreciably affected by change in pressure

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Question 64

Least possible value of correction factor fori) kinetic energy is zeroii) kinetic energy is 1iii) momentum is zeroiv) momentum is 1The correct statements are

A. (i) and (iii)
B. (ii) and (iii)
C. (i) and (iv)
D. (ii) and (iv)

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Question 65

A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of

A. 3.75 m
B. 4.0 m
C. 4.2m
D. 4.5m

View Answer

Question 66

Choose the wrong statement

A. The horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface
B. The horizontal component acts through the center of pressure for the vertical projection
C. The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area
D. he vertical component passes through the center of pressure of the volume

View Answer

Question 67

Select the incorrect statement.

A. The pressure intensity at vena contracta is atmospheric
B. Contraction is least at vena contracta
C. Stream lines are parallel throughout the jet at vena contracta
D. Coefficient of contraction is always less than one

View Answer

Question 68

When an ideal fluid flows past a sphere

A. highest intensity of pressure occurs around the circumference at right angles to flow
B. lowest pressure intensity occurs at front stagnation point
C. lowest pressure intensity occurs at rear stagnation point
D. total drag is zero

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Question 69

Which of the following velocity potentials satisfies continuity equation ?

A. x2y
B. x2-y2
C. cosx
D. x2 + y2

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Question 70

In one dimensional flow, the flow

A. is steady and uniform
B. takes place in straight line
C. takes place in curve
D. takes place in one direction

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Question 71

The length of a pipe is 1 km and its diameter is 20 cm. If the diameter of an equivalent pipe is 40 cm, then its length is

A. 32 km
B. 20 km
C. 8 km
D. 4 km

View Answer

Question 72

Working principle of dead weight pressure gauge tester is based on

A. Pascal’s law
B. Dalton’s law of partial pressure
C. Newton’s law of viscosity
D. Avogadro’s hypothesis

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Question 73

Choose the wrong statement

A. fluids are capable of flowing
B. fluids conform to the shape of the con-taining vessels
C. when in equilibrium, fluids cannot sustain tangential forces
D. when in equilibrium, fluids can sustain shear forces

View Answer

Question 74

The discharge over a rectangular notch is (where b = Width of notch, and H = Height of liquid, above the sill of the notch)

A. Cd x b2gH
B. Cd x b2g x H
C. Cd x b2g x H3/2
D. Cd x b2g x H2

View Answer

Question 75

Non uniform flow occurs when

A. the direction and magnitude of the velocity at all points are identical
B. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
C. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
D. velocity, depth, pressure, etc. change from point to point in the fluid flow.

View Answer

Question 76

The value of bulk modulus of a fluid is required to determine

A. Reynold's number
B. Froude's number
C. Mach number
D. Euler's number

View Answer

Question 77

Manometer is used to measure

A. pressure in pipes, channels etc
B. atmospheric pressure
C. very low pressure
D. difference of pressure between two points

View Answer

Question 78

Two dimensional flow occurs when

A. the direction and magnitude of the velocity at all points are identical
B. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
C. the magnitude and direction of the velocity do not change from point to point in the fluid
D. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

View Answer

Question 79

The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is

A. 1-3
B. 1-4
C. 1-2
D. 2-3

View Answer

Question 80

The units of kinematic viscosity are

A. metres² per sec
B. kg sec/meter
C. newton-sec per meter
D. newton-sec per meter

View Answer

Question 81

For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be

A. 300
B. 337.5
C. 600
D. 675

View Answer

Question 82

For a floating body to be in equilibrium

A. meta center should be above e.g.
B. center of buoyancy and e.g. must lie on same vertical plane
C. a righting couple should be formed
D. all of the above

View Answer

Question 83

Two pipe systems can be said to be equivalent, when the following quantites are same

A. friction loss and flow
B. length and diameter
C. flow and length
D. friction factor and diameter

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Question 84

Coefficient of resistance is the ratio of

A. actual velocity of jet at vena contracta to the theoretical velocity
B. area of jet at vena contracta to the area of orifice
C. loss of head in the orifice to the head of water available at the exit of the orifice
D. actual discharge through an orifice to the dieoretical discharge

View Answer

Question 85

Choose the wrong statement

A. The center of buoyancy is located at the center of gravity of the displaced liquid
B. For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy
C. For stability of floating cylinders or spheres, the e.g. of body must lie below the center of buoyancy
D. All floating bodies are stable

View Answer

Question 86

The resultant upward pressure of the fluid on an immersed body is called

A. upthrust
B. buoyancy
C. center of pressure
D. all the above are correct

View Answer

Question 87

If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be

A. h
B. wh
C. w/h
D. h/w

View Answer

Question 88

The bulk modulus of elasticity with increase in pressure

A. increases
B. decreases
C. remains constant
D. increases first upto certain limit and then decreases

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Question 89

Drag force is a function ofi) projected area of the bodyii) mass density of the fluidiii) velocity of the bodyThe correct answer is

A. (i) and (ii)
B. (i) and (iii)
C. (ii) and (iii)
D. (i), (ii) and (iii)

View Answer

Question 90

The pressure measured with the help of a piezometer tube is in

A. N/mm2
B. N/m2
C. head of liquid
D. all of these

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Question 91

The increase in meta centric heighti) increases stabilityii) decreases stabilityiii) increases comfort for passengersiv) decreases comfort for passengersThe correct answer is

A. (i) and (iii)
B. (i) and (iv)
C. (ii) and (iii)
D. (ii) and (iv)

View Answer

Question 92

A fluid in equilibrium can’t sustain

A. tensile stress
B. compressive stress
C. shear stress
D. bending stress

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Question 93

In an immersed body, center of pressure is

A. at the center of gravity
B. above the center of gravity
C. below be center of gravity
D. could be above or below e.g. depending on density of body and liquid

View Answer

Question 94

A model of a reservior is drained in 4 mts by opening the sluice gate. The model scale is 1: 225. How long should it take to empty the prototype ?

A. 4 minutes
B. 4 x (225)3/2 minutes
C. 4 (225)1/3 minutes
D. 4 x (225)1/2 minutes

View Answer

Question 95

If velocity is zero over l/3rd of a cross-section and is uniform over remaining 2/3rd of the cross-section, then the correction factor for kinetic energy is

A. 4-3
B. 3-2
C. 9-4
D. 27/8

View Answer

Question 96

For a floating body to be in stable equilibrium, its metacentre should be

A. below the center of buoyancy
B. above the center of buoyancy
C. between e.g. and center of pressure
D. above the center of gravity.

View Answer

Question 97

Fluid is a substance that

A. cannot be subjected to shear forces
B. always expands until it fills any container
C. has the same shear stress.at a point regardless of its motion
D. cannot remain at rest under action of any shear force

View Answer

Question 98

Buoyant force is

A. resultant force acting on a floating body
B. equal to the volume of liquid displaced
C. force necessary to keep a body in equilibrium
D. the resultant force on a body due to the fluid surrounding it

View Answer

Question 99

A siphon is used to connect two reservoirs at different levels intervened by a high ridge.

A. TRUE
B. FALSE

View Answer

Question 100

The center of pressure of a surface subjected to fluid pressure is the point

A. on the surface at which resultant pres-sure acts
B. on the surface at which gravitational force acis
C. at which all hydraulic forces meet
D. similar to metacentre

View Answer

Question 101

Choose the wrong statement

A. any weight, floating or immersed in a liquid, is acted upon by a buoyant force
B. Buoyant force is equal to the weight of the liquid displaced
C. The point through which buoyant force acts, is called the center of buoyancy
D. Center of buoyancy is located above the center of gravity of the displaced liquid v

View Answer

Question 102

Dynamic viscosity of most of the liquids with rise in temperature

A. increases
B. decreases
C. remains unaffected
D. unpredictable

View Answer

Question 103

Ratio of inertia force to surface Jension is known as

A. Mach number
B. Froude number
C. Reynold’s number
D. Weber’s number

View Answer

Question 104

A manometer is used to measure

A. low pressure
B. moderate pressure
C. high pressure
D. atomospheric pressure

View Answer

Question 105

The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the sub-merged body is called

A. upthrust
B. reaction
C. buoyancy
D. metacentre

View Answer

Question 106

The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is

A. d > m > e
B. d > e > m
C. e > m > d
D. e > d > m

View Answer

Question 107

The loss of head due to an obstruction in a pipe is twice the loss of head at its entrance.

A. Agree
B. Disagree

View Answer

Question 108

The theoretical value of coefficient of contraction of a sharp edged orifice is

A. 0.611
B. 0.85
C. 0.98
D. 1

View Answer

Question 109

Steady flow occurs when

A. the direction and magnitude of the velocity at all points are identical
B. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
C. the magnitude and direction of the velocity do not change from point to point in the fluid
D. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

View Answer

Question 110

In order to measure the flow with a venturimeter, it is installed in

A. horizontal line
B. inclined line with flow upwards
C. inclined line with flow downwards
D. any direction and in any location

View Answer

Question 111

The flow in which the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant to instant, is known as

A. one dimensional flow
B. uniform flow
C. steady flow
D. turbulent flow

View Answer

Question 112

If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is

A. 0.25
B. 0.5
C. 1
D. none of the above

View Answer

Question 113

A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?

A. 1 : 5
B. 1 : 2.5
C. 1 :25
D. 01:50

View Answer

Question 114

In an isothermal atmosphere, the pressure

A. decreases linearly with elevation
B. remains constant
C. varies in the same way as the density
D. increases exponentially with elevation

View Answer

Question 115

In a forced vortex, the velocity of flow everywhere within the fluid is

A. maximum
B. minimum
C. zero
D. non-zero finite

View Answer

Question 116

A streamline is defined as the line

A. parallel to central axis flow
B. parallel to outer surface of pipe
C. of equal yelocity in a flow
D. along which the pressure drop is uniform

View Answer

Question 117

Which of the following instrument can be used for measuring speed of a submarine moving in deep sea

A. Venturimeter
B. hot wire anemometer
C. rotameter
D. pitot tube

View Answer

Question 118

If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will

A. rise until its weight equals the buoyant force
B. tend to move downward and it may finally sink
C. float
D. none of the above

View Answer

Question 119

Which of the following meters is not associated with viscosity

A. Red wood
B. Say bolt
C. Engler
D. Orsat

View Answer

Question 120

Two pipe systems are said to be equivalent when

A. head loss and discharge are same in two systems
B. length of pipe and discharge are same in two systems
C. friction factor and length are same in two systems
D. length and diameter are same in two systems

View Answer

Question 121

In a depressed nappe

A. the pressure below the nappe is atmospheric
B. the pressure below the nappe is negative
C. the pressure above the nappe is atmospheric
D. the pressure above the nappe is negative

View Answer

Question 122

Separation of flow occurs when

A. the pressure intensity reaches a minimum
B. the cross-section of a channel is reduced
C. the boundary layer comes to rest
D. all of the above

View Answer

Question 123

If a vessel containing liquid moves downward with a constant acceleration equal to ‘g’ then

A. the pressure throughout the liquid mass is atmospheric
B. there will be vacuum in the liquid
C. the pressure in the liquid mass is greater than hydrostatic pressure
D. none of the above

View Answer

Question 124

In which of the following the friction drag is generally larger than pressure drag?

A. a circular disc or plate held normal to flow
B. a sphere
C. a cylinder
D. an airfoil

View Answer

Question 125

In a free vortex motion, the radial component of velocity everywhere is

A. maximum
B. minimum
C. zero
D. non-zero and finite

View Answer

Question 126

Mach number is significant in

A. supersonics, as with projectiles and jet propulsion
B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship’s hulls
D. all of fhe above

View Answer

Question 127

The continuity equation is connected with

A. viscous/unviscous fluids
B. compressibility of fluids
C. conservation of mass
D. steady/unsteady flow

View Answer

Question 128

Which of the following is an example of laminar flow?

A. Under ground flow
B. Flow past tiny bodies
C. Flow of oil in measuring instruments
D. all of these

View Answer

Question 129

Dynamic viscosity of most of the gases with rise in temperature

A. increases
B. decreases
C. remains unaffected
D. unpredictable

View Answer

Question 130

The losses are more in

A. laminar flow
B. transition flow
C. turbulent flow
D. critical flow

View Answer

Question 131

The metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.

A. The bodies A and B have equal stability
B. The body A is more stable than body B
C. The body B is more stable than body A
D. The bodies A and B are unstable

View Answer

Question 132

The velocity of jet of water travelling out of opening in a tank filled with water is proportional to

A. head of water (h)
B. h2
C. V/T
D. h2

View Answer

Question 133

Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is

A. slightly less
B. slightly more
C. nearly half
D. equal

View Answer

Question 134

A large Roynold number is indication of

A. smooth and streamline flow
B. laminar flow
C. turbulent flow
D. highly turbulent flow.

View Answer

Question 135

In case of an airfoil, the separation of flow occurs

A. at the extreme rear of body
B. at the extreme front of body
C. midway between rear and front of body
D. any where between rear and front of body depending upon Reynolds number

View Answer

Question 136

Dimensions of surface tension are

A. ML°T-2
B. ML°T
C. ML r-2
D. ML2T2

View Answer

Question 137

When the velocity distribution is uniform over the cross-section, the correction factor for momentum is

A. 0
B. 1
C. 4-3
D. 2

View Answer

Question 138

If a body floating in a liquid returns back to its original position, when given a small angular displacement, the body is said to be in

A. neutral equilibrium
B. stable equilibrium
C. unstable equilibrium
D. none of these

View Answer

Question 139

Thee horizontal component of buoyant force is

A. negligible
B. same as buoyant force
C. zero
D. none of the above

View Answer

Question 140

The Bernoulli's equation is based on the assumption that

A. there is no loss of energy of the liquid flowing
B. the velocity of flow is uniform across any cross-section of the pipe
C. no force except gravity acts on the fluid
D. all of the above

View Answer

Question 141

The pressure at a point in a fluid will not be same in all the directions when the fluid is

A. moving
B. viscous
C. inviscous and moving
D. viscous and moving.

View Answer

Question 142

The center of gravity of the volume of the liquid displaced by an immersed body is called

A. meta-center
B. center of pressure
C. center of buoyancy
D. center of gravity

View Answer

Question 143

The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is (where R is radius of pipe)

A. 0.223 R
B. 0.423 R
C. 0.577 R
D. 0.707 R

View Answer

Question 144

If the velocity is zero over half of the cross-sectional area and is uniform over the remaining half, then the momentum correction factor is

A. 1
B. 4-3
C. 2
D. 4

View Answer

Question 145

Ratio of inertia force to elastic force is known as

A. Mach number
B. Froude number
C. Reynold’s number
D. Weber’s number

View Answer

Question 146

The pitot tube is used to measure

A. velocity at stagnation point
B. stagnation pressure
C. static pressure
D. dynamic pressure

View Answer

Question 147

Specific weight of water in S.I. units is equal to

A. 1000 N/m3
B. 10000 N/m3
C. 9.81 xlO3 N/m3
D. 9.81 xlO6 N/m3

View Answer

Question 148

Newton’s law of viscosity relates

A. intensity of pressure and rate of angular deformation
B. shear stress and rate of angular deformation
C. shear stress, viscosity and temperature
D. viscosity and rate of angular deformation

View Answer

Question 149

For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is

A. directly proportional to Reynolds number and independent of pipe wall roughness
B. directly proportional to pipe wall roughness and independent of Reynolds number
C. inversely proportional to Reynolds number and indpendent of pipe wall roughness
D. inversely proportional to Reynolds number and directly proportional to pipe wall roughness

View Answer

Question 150

The pressure less than atmospheric pressure is known as

A. suction pressure
B. vacuum pressure
C. negative gauge pressure
D. all of these

View Answer

Question 151

The wake

A. always occurs before a separation point
B. always occurs after a separation point
C. is a region of high pressure intensity
D. none of the above

View Answer

Question 152

For very great pressures, viscosity of moss gases and liquids

A. remains same
B. increases
C. decreases
D. shows erratic behaviour

View Answer

Question 153

Operation of McLeod gauge used for low pressure measurement is based on the principle of

A. gas law
B. Boyle’s law
C. Charle’s law
D. Pascal’s law

View Answer

Question 154

When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wave), the portion of pipe length subjected to maximum head is

A. L/4
B. L/3
C. L/2
D. L

View Answer

Question 155

The maximum thickness of boundary layer in a pipe of radius r is

A. 0
B. r/2
C. r
D. 2r

View Answer

Question 156

The speed of sound in a ideal gas varies directly as its

A. absolute temperature
B. temperature
C. density
D. modulus of elasticity

View Answer

Question 157

Center of buoyancy is the

A. centroid of the displaced volume of fluid
B. center of pressure of displaced volume
C. e.g. of floating body
D. does not exist

View Answer

Question 158

Which of the following instrument can be used for measuring speed of an aeroplane

A. Venturimeter
B. Orifice plate
C. rotameter
D. pitot tube

View Answer

Question 159

The centre of buoyancy is the centre of area of the immersed body.

A. Correct
B. Incorrect

View Answer

Question 160

An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to

A. g/3
B. g/2
C. 2g/3
D. g

View Answer

Question 161

If no resistance is encountered by displacement, such a substance is known as

A. fluid
B. water
C. perfect solid
D. ideal fluid

View Answer

Question 162

The upper surface of a weir over which water flows is known is

A. crest
B. nappe
C. sill
D. weir top

View Answer

Question 163

Kinematic viscosity is dependent upon

A. pressure
B. distance
C. flow
D. density

View Answer

Question 164

Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be

A. 1000 kg
B. 4000 kg
C. 2000 kg
D. 8000 kg

View Answer

Question 165

The resultant of all normal pressures acts

A. at e.g. of body
B. at center of pressure
C. vertically upwards
D. at metacentre

View Answer

Question 166

The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to

A. 1 Pa
B. 91 Pa
C. 981 Pa
D. 9810 Pa

View Answer

Question 167

Metacentric height for small values of angle of heel is the distance between the

A. centre of gravity and centre of buoy-ancy
B. centre of gravity and metacentre
C. centre of buoyancy and metacentre
D. free surface and centre of buoyancy

View Answer

Question 168

The weight per unit volume of a liquid at a standard temperature and pressure is called

A. specific weight
B. mass density
C. specific gravity
D. none of these

View Answer

Question 169

According to equation of continuity,

A. w1a1 = w2a2
B. w1v1 = w2v2
C. a1v1 = a2v2
D. a1/v1 = a2/v2

View Answer

Question 170

For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is

A. constant
B. dependent only on Reynolds number
C. a function of Reynolds number and relative roughness
D. dependent on relative roughness only

View Answer

Question 171

A weir is said to be broad crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.

A. equal to.
B. less than
C. more than

View Answer

Question 172

In a free nappe,

A. the pressure below the nappe is atmospheric
B. the pressure below the nappe is negative
C. the pressure above the nappe is atmospheric
D. the pressure above the nappe is negative

View Answer

Question 173

A closed tank containing water is moving in a horizontal direction along a straight line at a constant speed. The tank also contains a steel ball and a bubble of air. If the tank is decelerated horizontally, theni) the ball will move to the frontii) the bubble will move to the frontiii) the ball will move to the reariv) the bubble will move to the rear Find out which of the above statements are correct ?

A. (i) and (ii)
B. (i) and (iv)
C. (ii) and (iii)
D. (iii) and (iv)

View Answer

Question 174

The stress-strain relation of the newtoneon fluid is

A. linear
B. parabolic
C. hyperbolic
D. inverse type

View Answer

Question 175

An ideal fluid is

A. one which obeys Newton’s law of viscosity
B. frictionless and incompressible
C. very viscous
D. frictionless and compressible

View Answer

Question 176

For pipes, laminar flow occurs when Roynolds number is

A. less than 2000
B. between 2000 and 4000
C. more than 4000
D. less than 4000

View Answer

Question 177

In series-pipe problems

A. the head loss is same through each pipe
B. the discharge is same through each pipe
C. a trial solution is not necessary
D. the discharge through each pipe is added to obtain total discharge

View Answer

Question 178

The time oscillation of a floating body with increase in metacentric height will be

A. same
B. higher
C. lower
D. lower/higher depending on weight of body

View Answer

Question 179

A structure whose width is __________ the width of the channel, is called a flumed structure.

A. less than
B. more than

View Answer

Question 180

The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is

A. 1-2
B. 2-3
C. 3-2
D. 2

View Answer

Question 181

Select the correct statement

A. Local atmospheric pressure depends upon elevation of locality only
B. Standard atmospheric pressure is the mean local atmospheric pressure a* sea level
C. Local atmospheric pressure is always below standard atmospheric pressure
D. A barometer reads the difference be-tween local and standard atmospheric pressure

View Answer

Question 182

With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on

A. a circular disc of plate held normal to flow
B. a sphere
C. a cylinder
D. a streamlined body

View Answer

Question 183

The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where RN = Reynold number)

A. 1/RN
B. 4/RN
C. 16/RN
D. 64/RN

View Answer

Question 184

The line of action of the buoyant force acts through the

A. centroid of the volume of fluid vertically above the body
B. center of the volume of floating body
C. center of gravity of any submerged body
D. centriod of the displaced volume of fluid

View Answer

Question 185

A fluid is said to be ideal, if it is

A. incompressible
B. inviscous
C. inviscous and compressible
D. inviscous and incompressible.

View Answer

Question 186

In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

A. less than
B. more than

View Answer

Question 187

The difference of pressure between the inside and outside of a liquid drop is

A. (a)p = Txr
B. (b)p = T/r
C. p = T/2r
D. (d)p = 2T/r

View Answer

Question 188

The centre of gravity of the volume of the liquid displaced is called

A. centre of pressure
B. centre of buoyancy
C. metacentre
D. none of these

View Answer

Question 189

A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal tc

A. 10 kg
B. 100 kg
C. 1000 kg
D. 1 kg

View Answer

Question 190

In a venturimeter, the velocity of liquid at throat is __________ than at inlet.

A. higher
B. lower

View Answer

Question 191

The continuity equation pi V,A,= p2V2A2 is based on the following assumption regarding flow of fluid (where pi and p2 are mass densities.)

A. steady flow
B. uniform flow
C. incompressible flow
D. frictionless flow

View Answer

Question 192

A perfect gas

A. has constant viscosity
B. is incompressible
C. is of theoretical interest
D. none of the above.

View Answer

Question 193

The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is (where R is the radius of pipe)

A. 1/3 R
B. 1/2 R
C. 2/3 R
D. 3/4 R

View Answer

Question 194

In a Sutro weir, the discharge is proportional to (where H is head)

A. H1/2
B. H3/2
C. H5/2
D. H

View Answer

Question 195

The coefficient of viscosity may be determined by

A. capillary tube method
B. orifice type viscometer
C. rotating cylinder method
D. all of these

View Answer

Question 196

Which of the following statements is correct?

A. Lower critical Reynolds number is of no practical significance in pipe flow problems.
B. Upper critical Reynolds number is significant in pipe flow problems.
C. Lower critical Reynolds number has the value 2000 in pipe flow
D. Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow.

View Answer

Question 197

Surface tension has the units of

A. newtons/m2
B. newtons/cm
C. newtons/m
D. newtons

View Answer

Question 198

A floating body is said to be in a state of stable equilibrium

A. when its metacentric height is zero
B. when the metacentre is above the centre of gravity
C. when the metacentre is below the centre of gravity
D. only when its centre of gravity is below its centre of buoyancy

View Answer

Question 199

Flow at constant rate through a tapering pipe isi) steady flowii) uniform flowiii) unsteady flowiv) non-uniform flowThe correct answer is

A. (i) and (ii)
B. (i)and(iv)
C. (ii) and (iii)
D. (ii) and (iv)

View Answer

Question 200

In a forced vortex motion, the velocity of flow is

A. directly proportional to its radial distance from axis of rotation
B. inversely proportional to its radial distance from the axis of rotation
C. inversely proportional to the square of its radial distance from the axis of rotation
D. directly proportional to the square of its radial distance from the axis of rotation

View Answer

Question 201

The conditions for the stable equilibrium of a floating body are

A. the meta-center should lie above the center of gravity
B. the center of buoyancy and the center of gravity must lie on the same vertical line
C. a righting couple should be formed
D. all the above are correct

View Answer

Question 202

The stability of a dam is checked for

A. tension at the base
B. overturning of the wall or dam
C. sliding of the wall or dam
D. all of these

View Answer

Question 203

In steady flow of a fluid, the total accele ration of any fluid particle

A. can be zero
B. is never zero
C. is always zero
D. is independent of coordinates

View Answer

Question 204

A body floats in stable equilibrium

A. when its meatcentric height is zero
B. when the metancentre is above e.g.
C. when its e.g. is below it’s center of buoyancy
D. metacentre has nothing to do with position of e.g. for determining stability

View Answer

Question 205

The property of fluid by virtue of which it offers resistance to shear is called

A. surface tension
B. adhesion
C. cohesion
D. viscosity

View Answer

Question 206

The coefficient of discharge for an external mouthpiece is

A. 0.375
B. 0.5
C. 0.707
D. 0.855

View Answer

Question 207

Which of the following is demensionless

A. specific weight
B. specific volume
C. specific speed
D. specific gravity

View Answer

Question 208

At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

A. minimum
B. maximum
C. negative value
D. could be any value

View Answer

Question 209

For a body floating in a liquid the normal pressure exerted by the liquid acts at

A. bottom surface of the body
B. e.g. of the body
C. metacentre
D. all points on the surface of the body

View Answer

Question 210

A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039 m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is

A. 400 kg/cm²
B. 4000 kg/cm²
C. 40 x 105 kg/cm²
D. 40 x 106 kg/cm²

View Answer

Question 211

The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s)

A. w x Q x H
B. w x Q x hf
C. w x Q (H - hf)
D. w x Q (H + hf)

View Answer

Question 212

The flow in which each liquid particle has a definite path and their paths do not cross each other is called

A. one dimensional flow
B. uniform flow
C. turbulent flow
D. streamline flow

View Answer

Question 213

Pressure of the order of 10''' torr can be measured by

A. Bourdon tube
B. Pirani Gauge
C. micro-manometer
D. ionisastion gauge

View Answer

Question 214

The maximum efficiency of transmission through a pipe is

A. 50%
B. 56.70%
C. 66.67%
D. 76.66%

View Answer

Question 215

Units of surface tension are

A. energy/unit area
B. distance
C. both of the above
D. it has no units

View Answer

Question 216

Which of the following has highest coefficient of discharge ?

A. sharp edged orifice
B. venturimeter
C. Borda’s mouthpiece running full
D. CipoUetti weir

View Answer

Question 217

A flow in which the volume of a fluid and its density does not change during the flow is called __________ flow.

A. incompressible
B. compressible

View Answer

Question 218

The specific weight of water is 1000 kg/m”

A. at normal pressure of 760 mm
B. at 4°C temperature
C. at mean sea level
D. all the above

View Answer

Question 219

The major loss of energy in long pipes is due to

A. sudden enlargement
B. sudden contraction
C. gradual contraction or enlargement
D. friction

View Answer

Question 220

Which of the following is an incorrect statement ?

A. Coefficient of contraction of a venturimeter is unity
B. Flow nozzle is cheaper than venturimeter but has higher energy loss
C. Discharge is independent of orientation of venturimeter whether it is horizontal, vertical or inclined
D. None of the above statement is correct

View Answer

Question 221

The resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body. This definition is according to

A. Buoyancy
B. Equilibrium of a floating body
C. Archimedes’ principle
D. Bernoulli’s theorem

View Answer

Question 222

For measuring flow by a venturimeter, if should be installed in

A. vertical line
B. horizontal line
C. inclined line with upward flow
D. in any direction and in any location.

View Answer

Question 223

Which of the following instruments is used to measure flow on the application of Bernoulli’s theorem

A. Venturimeter
B. Orifice plate
C. pitot tube
D. all of the above

View Answer

Question 224

Pascal-second is the unit of

A. pressure
B. kinematic viscosity
C. dynamic viscosity
D. surface tension

View Answer

Question 225

The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is ap-proximately

A. 5 mm
B. 10 mm
C. 20 mm
D. 30 mm

View Answer

Question 226

Resultant pressure of the liquid in the case of an immersed body acts through

A. center of gravity
B. center of pressure
C. metacentre
D. center of buoyancy

View Answer

Question 227

The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be (where D is the depth of flow)

A. 0.423 D
B. 0.577 D
C. 0.223 D
D. 0.707 D

View Answer

Question 228

The discharge over a broad crested weir is maximum when the depth of flow is (where H is the available head)

A. H/3
B. H/2
C. 2 H/5
D. 2 H/3

View Answer

Question 229

The eddy viscosity for turbulent flow is

A. a function of temperature only
B. a physical property of the fluid.
C. dependent on the flow
D. independent of the flow

View Answer

Question 230

Froude number is significant in

A. supersonics, as with projectile and jet propulsion
B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
D. all of the above

View Answer

Question 231

The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge)

A. Q = Cd x b2g(H2 - H1)
B. Q = Cd x b2g(H21/2 - H11/2)
C. Q = Cd x b2g(H23/2 - H13/2)
D. Q = Cd x b2g(H22 - H12)

View Answer

Question 232

Density of water is maximum at

A. 0°C
B. 0°K
C. 4°C
D. 100°C

View Answer

Question 233

The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is

A. 2.4 m
B. 3.0 m
C. 4.0 m
D. 2.5 m

View Answer

Question 234

The peoperty by virtue of which a liquid opposes relative motion between its different layers is called

A. surface tension
B. co-efficient of viscosity
C. viscosity
D. osmosis

View Answer

Question 235

To avoid an interruption in the flow of a syphon, an air vessel is provided

A. at the inlet
B. at the outlet
C. at the summit
D. ay nay point between inlet and outlet

View Answer

Question 236

An ideal fluid is frictionless and incompressible.

A. Correct
B. Incorrect

View Answer

Question 237

Choose the correct relationship

A. specific gravity = gravity x density
B. dynamicviscosity = kinematicviscosity x density
C. gravity = specific gravity x density
D. kinematicviscosity = dynamicviscosity x density

View Answer

Question 238

The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is (Assume that boundary layer is entirely laminar)

A. 0.40 cm
B. 0.20 cm
C. 0.10 cm
D. 0.05 cm

View Answer

Question 239

A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the center of bottom is

A. zero
B. one-fourth its value when cylinder was full
C. one-half its value when cylinder was full
D. cannot be predicted from the given data

View Answer

Question 240

A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at vater surface. The hydrostatic force on square surface is

A. 9,000 kg
B. 13,500 kg
C. 18,000 kg
D. 27,000 kg

View Answer

Question 241

The discharge of a liquid of kinematic viscosity 4 cm²/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is

A. laminar flow
B. transition flow
C. turbulent flow
D. not predictable from the given data

View Answer

Question 242

The total energy line lies over the hydraulic gradient line by an amount equal to the

A. pressure head
B. velocity head
C. pressure head + velocity head
D. pressure head - velocity head

View Answer

Question 243

The pressure at the summit of a syphon is

A. equal to atmospheric
B. less than atmospheric
C. more than atmospheric
D. none of the above

View Answer

Question 244

When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies

A. linearly with radial distance
B. as the square of the radial distance
C. inversely as the square of the radial distance
D. inversely as the radial distance

View Answer

Question 245

When the flow parameters at any given instant remain same at every point, then flow is said to be

A. quasi static
B. steady state
C. laminar
D. uniform

View Answer

Question 246

The Prartdtl mixing length is

A. zero at the pipe wall
B. maximum at the pipe wall
C. independent of shear stress
D. none of the above

View Answer

Question 247

Equation of continuity is based on the principle of conservation of

A. mass
B. energy
C. momentum
D. none of the above

View Answer

Question 248

The discharge through a siphon spillway is

A. Cd x a2gH
B. Cd x a2g x H3/2
C. Cd x a2g x H2
D. Cd x a2g x H5/2

View Answer

Question 249

The Reynold's number of a ship is __________ to its velocity and length.

A. directly proportional
B. inversely proportional

View Answer

Question 250

Piezometer is used to measure

A. pressure in pipe, channels etc
B. atmospheric pressure
C. very low pressures
D. difference of pressure between two points

View Answer

Question 251

Euler’s dimensionless number relates the following

A. inertial force and gravity
B. viscous force and inertial force
C. viscous force and buoyancy force
D. pressure force and inertial force

View Answer

Question 252

A rectangular block 2 m long, 1 m wide and 1 m deep floats in water, the depth of immersion being 0.5 m. If water weighs 10 kN/m3, then the weight of the block is

A. 5kN
B. lOkN
C. 15 kN
D. 20 kN

View Answer

Question 253

Differential monometer is used to measure

A. pressure in pipes, channels etc
B. atmospheric pressure
C. very low pressure
D. difference of pressure between two points

View Answer

Question 254

Metacentric height is given as the distance between

A. the center of gravity of the body andthe meta center
B. the center of gravity of the body and the center of buoyancy
C. the center of gravity of the body and the center of pressure
D. center of buoyancy and metacentre

View Answer

Question 255

If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is

A. less than 1
B. between 1 and 100
C. 160
D. 200

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Question 256

The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as

A. center of gravity
B. center of buoyancy
C. center of pressure
D. metacentre

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Question 257

Which of the following is the unit of kinematic viscosity

A. pascal
B. poise
C. stoke
D. faraday

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Question 258

Coefficient of contraction is the ratio of

A. actual velocity of jet at vena contracta to the theoretical velocity
B. loss of head in the orifice to the head of water available at the exit of the orifice
C. actual discharge through an orifice to the theoretical discharge
D. area of jet at vena contracta to the area of orifice

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Question 259

In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is

A. 22.5 m/sec.
B. 33 m/sec.
C. 40 m/sec.
D. 90 m/sec.

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Question 260

Select the correct statement.

A. The absolute roughness of a pipe de-creases with time
B. A pipe becomes smooth after using for long time
C. The friction factor decreases with time
D. The absolute roughness increases with time

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Question 261

Centre of pressure compared to e.g. is

A. above it
B. below it
C. at same point
D. above or below depending on area of body

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Question 262

The body will sink down if the force of buoyancy is __________ the weight of the liquid displaced.

A. equal to
B. less than
C. more than

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Question 263

The discharge through a V- notch varies as

A. H1/2
B. H3’2
C. H5/2
D. H5’4 where H is head.

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Question 264

The normal stress in a fluid will be constant in all directions at a point only if

A. it is incompressible
B. it has uniform viscosity
C. it is frictionless
D. it is at rest

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Question 265

Reynolds number is significant in

A. supersonics, as with projectile and jet propulsion
B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
D. all of the above

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Question 266

The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as

A. one dimensional flow
B. uniform f^w
C. steady flow
D. turbulent flow

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Question 267

The process of diffusion of one liquid into the other through a semi-permeable membrane is called

A. viscosity
B. osmosis
C. surface tension
D. cohesion

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Question 268

A pressure of 25 m of head of water is equal to

A. 25 kN/m2
B. 245 kN/m2
C. 2500 kN/m2
D. 2.5 kN/m2

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Question 269

The center of gravity of the volume of the liquid displaced by an immersed body is called

A. center of gravity
B. center of pressure
C. metacentre
D. center of buoyancy

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Question 270

The speed of a pressure wave through a pipe depends upon

A. the length of pipe
B. the viscosity of fluid
C. the bulk modulus for the fluid
D. the original head

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Question 271

The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if

A. the area is horizontal
B. the area is vertical
C. the area is inclined
D. all of the above

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