# Hydraulics MCQ Questions & Answers

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

Question 1

A piezometer opening in pipes measures

B. static pressure
C. total pressure
D. negative static pressure.

Question 2

A pipe of 0.1 m2 cross sectional area suddenly enlarges to 0.3 m2 cross-sectional area. If the discharge of the pipe is 0.3 m3 /sec, the head loss is

A. 2/g m of water
B. g/2 m of water
C. 1g m of water
D. g m of water.

Question 3

A pitot tube is used to measure

A. pressure
B. difference in pressure
C. velocity of flow
D. none of these.

Question 4

A short tube mouthpiece will not run full at its outlet if the head under which the orifice works, is

A. less than 12.2 m of the water
B. more than 12.2 m of the water
C. equal of 12.2 m of water
D. none of these.

Question 5

A syphon is used

A. to connect water reservoirs at different levels intervened by a hill
B. to supply water to a town from higher level to lower level
C. to fill up a tank with water at higher level from a lower level
D. none of these.

Question 6

A tank 4m x 3m x 2m containing an oil of specific gravity 0.83 is moved with an acceleration g/2 m sec2. The ratio of the pressures at its bottom when it is moving vertically up and down, is

A. 2
B. 3
C. 01-Feb
D. 01-Mar

Question 7

An ideal flow of a liquid obeys

A. Continuity equation
B. Newton's law of viscosity
C. Newton's second law of motion
D. dynamic viscosity law,

Question 8

An independent mass of a fluid does not posses

A. elevation energy
B. kinetic energy
C. pressure energy
D. none of these.

Question 9

Differential manometers are used to measure

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

Question 10

Highest dam in India, is

A. Bhakra dam
B. Hirakund dam
C. Nagarjuna Sagar dam
D. Iddiki dam.

Question 11

If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.1 kg/cm2, the pressure at a depth of 2.5 m, is

A. 1 metre of water
B. 2 metres of water
C. 3 metres of water
D. 3.5 metres of water

Question 12

If the total head of the nozzle of a pipe is 37.5 m and discharge is 1 cumec, the power generated is

A. 400 H.P.
B. 450 H.P.
C. 500 H.P.
D. 550 H.P.

Question 13

If the volume of a liquid weighing 3000 kg is 4 cubic metres, 0.75 is its

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

Question 14

Maximum efficiency of transmission of power through a pipe, is

A. 25%
B. 33.30%
C. 50%
D. 66.67%.

Question 15

Pick up the correct statement from the following :

A. For tranquil flow h > 2g or v <
B. For critical flow
C. For torrential flow h > or v < gh
D. None of these.

Question 16

Reynold number is the ratio of initial force and

A. viscosity
B. elasticity
C. gravitational force
D. surface tension.

Question 17

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

A. weight of liquid vertically below the curved surface
B. force on a vetical projection of the curved surface
C. product of pressure at its centroid and the area
D. weight of liquid retained by the curved area.

Question 18

The maximum vacuum created at the summit of a syphon is

A. 2.7 m of water
B. 7.4 m of water
C. 5.5 m of water
D. none.

Question 19

The momentum correction factor (β) for the viscous flow through a circular pipe is

A. 1.25
B. 1.33
C. 1.5
D. 1.66

Question 20

The phenomenon occuring in an open channel when a rapidly flowing stream abruptly changes to a slowly flowing stream causing a distinct rise of liquid surface, is

A. water hammer
B. hydraulic jump
C. critical discharge
D. none of these.

Question 21

The radius of gyration of the water line of a floating ship is 4 m and its metacentric height is 72.5 cm. The period of oscillation of the ship, is

A. π
B. 2π
C. 3π
D. 4π

Question 22

The ratio of maximum velocity to average velocity of viscous fluid through a circular pipe is

A. 0.5
B. 0.75
C. 1.25
D. 2

Question 23

The shear stress distribution in viscous fluid through a circular pipe is :

A. maximum at the centre
B. maximum at the inside of surface
C. same throughout the section
D. none of these.

Question 24

The side slope of Cipolletti weir is generally kept

A. 1 to 4
B. 1 to 3
C. 1 to 2
D. 01:05

Question 25

The thickness of a sharp crested weir is kept less than

A. one-third of the height of water on the sill
B. one-half of the height of water on the sill
C. one-fourth of the height of water on the sill
D. two-third of the height of water on the sill

Question 26

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

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

Question 27

Unit of kinematic viscosity is

A. m2/sec
B. Newton sec/m2
C. Newton sec/m3
D. Kg sec/m2.