# Diesel Vs Petrol Engine MCQ Questions & Answers

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

Question 1

1 kg of air is compressed from 40 m3 volume under 100 kPa pressure to 1 m3 volume. What will be the pressure at constant temperature?

A. 5000 kPa
B. 6170 kPa
C. 3215 kPa
D. 4000 kPa

Question 2

7 gram of gas occupies a volume of 4.1 litre at 300°K temperature and 1 atmospheric pressure. What will be the molecular mass of gas?

A. 78.19
B. 42.05
C. 35.65
D. 18.19

Question 3

A cylinder can withstand the L.P.G. at 16.7 atmospheric pressure, if at any time instant the inside pressure of L.P.G. becomes 13 atmosphere pressures at 27°C. Then what will be the temperature at which it will explode?

A. 116.7°C
B. 114.1°C
C. 112.1°C
D. 111.6°C

Question 4

A diesel engine transmits 25 KW at the end of the crankshaft, moving at 1650 rev/min, find the torque exerted by the piston.

A. 148.90 Newton-metre
B. 144.75 Newton-metre
C. 150.75 Newton-metre
D. 120.10 Newton-metre

Question 5

A high-speed diesel engine operating at 2000 rev/min has a single cylinder. During the compression stroke, the fuel injection starts 20° before TDC and ends at TDC. Determine the duration the fuel injection takes place.

A. 1/600 seconds
B. 2/248 seconds
C. 1/60 seconds
D. 2/319 seconds

Question 6

A six-cylinder 4-stroke engine has bore diameter 11 cm and stroke length 12.2 cm running at 2800 rev/min consumes 455m2 of air per hour. What would be the volumetric efficiency of the engine?

A. 75%
B. 78.70%
C. 77.80%
D. 76%

Question 7

A tractor tyre contains 28 litre of air at 184 kPa pressure and 27°C temperature. How much air does the tyre contain?

A. 0.0599 kg
B. 0.599 kg
C. 55.059 kg
D. 5.99 kg

Question 8

The correct way of representing the compression ratio is __________

A. C.R.=$$\frac{Total \, cylinder \, volume}{Clearance \, Volume}$$
B. C.R.=$$\frac{Clearance \, Volume}{Total \, Clearance \, Volume}$$
C. C.R.=$$\frac{Total \, clearance \, volume}{Cylinder \, Volume}$$
D. C.R.=$$\frac{Clearance \, volume}{Total \, cylinder \, volume}$$

Question 9

The device in which air-fuel mixture is prepared away from the cylinder of an engine is known as __________

A. Lubricant
B. Delivery valve
C. Nozzle holder
D. Carburettor

Question 10

The first I.C. engine was invented by _______

A. Nikolaus Otto
B. James Watt
C. Hudson
D. Norman

Question 11

The function of piston pin is to _________

A. Absorb the cylinder heat
B. Join the connecting rod to the piston
C. Increase the speed
D. Joint wheel and connecting rod

Question 12

The minimum temperature required for a liquid fuel to form a spontaneously combustible mixture is known as ____________

A. Flash point
B. Fluid coupling
C. Differential
D. Disc brake

Question 13

The process of removal of burnt or exhaust gases from the engine cylinder is known as ___________

A. Tappet
B. Skirt
C. Scavenging
D. Suction

Question 14

What is the clearance between rocker arm and valve stem is known as _______

A. Valve clearance
B. Sleeve
C. Tappet clearance
D. Buffer space

Question 15

What is the detachable portion of engine, which covers the upper end of the cylinder known as ______

B. Ignition cell
C. Combustion cell
D. Manifold

Question 16

What will be the temperature, at which 28g nitrogen occupies a volume of 10 litres at 2.46 atmospheric pressure?

A. 319.48 K
B. 456.23 K
C. 299.64 K
D. 123.45 K

Question 17

Where are manifolds fitted?

A. The lower part of cylinder
B. The intake valves
C. The exhaust valves
D. The side of the cylinder

Question 18

Which engine is designed to convert chemical energy of heavier fuel oil into mechanical energy?

A. Diesel engine
B. Petrol engine
C. Injector
D. Tappet clearance

Question 19

Which of the following is not a function of a flywheel?

A. It stores energy during power stroke and returns back the same energy during the idle strokes, providing a rotary motion
B. It carries ring gear that meshes with the pinion of starting motor
C. It is used to join the connecting rod to piston
D. It serves the purpose of a pulley for transmitting power