Automobile Engineering Multiple Choice Questions(MCQs) & Answers

Questions

1 As the number of cylinders in multi cylinder engines increases the power to weight ratio ………

A Remains the same

B Increases

C Becomes zero

D Decreases

View Answer

Answer: Increases

2 The maximum pressure of air at the end of compression in diesel engines is about

A 10 Kg/cm2

B 100 Kg/cm2

C 300 Kg/cm2

D 30 Kg/cm2

View Answer

Answer: 30 Kg/cm2

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3 The characteristic of an object which makes it resist any tendency to change its direction of motion is called

A Inertia

B Power

C Internal energy

D None

View Answer

Answer: Inertia

4 When we lift a 10 kg weight, 3 metre we would be doing

A 300 m kg of work

B 3 m kg of work

C 30 m kg of work

D None

View Answer

Answer: 30 m kg of work

5 The maximum pressure of air fuel mixture at the end of compression in petrol engines varies from

A 100-1000 Kg/cm2

B 10-30 Kg/cm2

C 30-100 Kg/cm2

D 6-10 Kg/cm2

View Answer

Answer: 10-30 Kg/cm2

6 Engine torque is highest at

A Low speed

B Intermediate speed

C High speed

D None

View Answer

Answer: Intermediate speed

7 One of the major causes of FHP in an engine is

A High speed

B High volumetric efficiency

C Piston-ring friction

D None

View Answer

Answer: Piston-ring friction

8 For diesel engines the nominal compression ratio is from

A 17 to 21:1

B 7.5 to 8.5:1

C 30 to 40:1

D 1 to 5:1

View Answer

Answer: 17 to 21:1

9 For petrol engines the nominal compression ratio will vary between

A 1 to 2:1

B 18 to 21:1

C 7.5 to 8.5:1

D 1 to 5:1

View Answer

Answer: 7.5 to 8.5:1

10 Connecting rods are generally of the following from

A Forged I section steel

B Forged round section steel

C Cast steel triangular section

D Forged square section steel

View Answer

Answer: Forged I section steel

11 The temperature of the piston will be more at

A The piston walls

B The crown of the piston

C The skirt of the piston

D The piston pin

View Answer

Answer: The crown of the piston

12 The two-stroke engine has valve ports in the

A Cylinder walls

B Pistons

C Piston rings

D None

View Answer

Answer: Cylinder walls

13 The crankcase scavenging the the crankcase or underside of the piston acts as

A An air compressor

B A blower

C A ventilator

D A breather

View Answer

Answer: An air compressor

14 The fuel injected when pressure in the cylinder reaches the point ……….. on the curve

A 1

B 2

C 3

D 4

View Answer

Answer: 3

15 The heat is added in the cycle at

A Constant pressure

B Constant volume

C Approximately constant pressure and constant volume

D None

View Answer

Answer: Approximately constant pressure and constant volume

16 During compression stroke the air is compressed according to

A Isothermal process

B Hyperbolic process

C Adiabatic process

D Constant pressure process

View Answer

Answer: Adiabatic process

17 During suction stroke the pressure inside the cylinder is

A Equal to atmospheric pressure

B Above atmospheric pressure

C Above or below atmospheric pressure

D Below atmospheric pressure

View Answer

Answer: Below atmospheric pressure

18 The type of air cycle used in diesel engine is called

A Otto cycle

B Carnot cycle

C Diesel cycle

D Rankine cycle

View Answer

Answer: Diesel cycle

19 In commercial vehicle layouts engine is located forward, rear or under floor mainly to

A Better utilization of space

B Increase fuel economy

C Better weight distribution

D Reduce the weight of chassis

View Answer

Answer: Better weight distribution

20 The type of friction generally present in an automotive engine is

A Viscous friction

B Greasy friction

C Dry friction

D None

View Answer

Answer: Viscous friction

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