Automobile Engineering MCQ Questions & Answers

71

The purpose of a thermostat in an engine cooling system is to

A) Prevent the coolant from boiling B) Allow the engine to warm up quickly C) Indicate the coolant temperature D) Pressurise the system to raise the boiling point

Discuss

Answer & Solution

Answer: Option B

Solution:

When the engine is cold, the thermostat is closed and prevents coolant from flowing into the engine and allows the engine to warm up.
Once the engine has warmed, the thermostat will open and allow coolant to flow and cool the engine when it starts to get too hot.
This function is vital for optimal engine performance.

72

In an engine, the temperature of the piston will be more at the

A) Crown of the piston B) Skirt of the piston C) Piston walls D) Piston rings

Discuss

Answer & Solution

Answer: Option A

Solution:

In an engine, the temperature of the piston will be more at the Crown of the piston

73

The diagram which shows the correct crank positions corresponding to the opening and closing of the valves, is known as

A) Indicator diagram B) Axial force diagram C) Valve timing diagram D) None of these

Discuss

Answer & Solution

Answer: Option C

Solution:

A valve timing diagram is a graphical representation of the opening and closing of the intake and exhaust valve of the engine,

74

Engine misfiring is likely to result from

A) Spark plug gap too small B) Spark plug gap too wide C) Vapours lock in the fuel only D) Incorrect fuel air mixture

Discuss

Answer & Solution

Answer: Option B

Solution:

Engine misfiring is likely to result from Spark plug gap too wide

75

A clutch is usually designed to transmit maximum torque which is

A) Equal to the maximum engine torque B) 80% of the maximum engine torque C) 150% of the maximum engine torque D) None of these

Discuss

Answer & Solution

Answer: Option C

Solution:

A clutch is usually designed to transmit maximum torque which is 150% of the maximum engine torque

76

The effect of vapour locking on the brake performance is that the

A) Brakes function more effectively B) Brakes fail completely C) Brake operation is delayed after depression of the brake pedal D) Vapour locking has no effect on brake performance

Discuss

Answer & Solution

Answer: Option B

Solution:

The effect of vapour locking on the brake performance is that the Brakes fail completely

77

The acid used in automobile battery is

A) Hydrochloric acid B) Hydrofluoric acid C) Nitric acid D) Sulphuric acid

Discuss

Answer & Solution

Answer: Option D

Solution:

The acid used in automobile battery is Sulphuric acid

78

Damper in an automobile is used to

A) Absorb the energy B) Dissipate the energy C) Release the energy D) Increase the energy

Discuss

Answer & Solution

Answer: Option B

Solution:

Damper in an automobile is used to Dissipate the energy

79

In a hydraulic power steering system, the power steering pump is driven by a

A) Belt driven by camshaft B) Chain driven by crankshaft C) Belt driven by drive-shaft D) Belt driven by crankshaft

Discuss

Answer & Solution

Answer: Option D

Solution:

In a hydraulic power steering system, the power steering pump is driven by a Belt driven by crankshaft

80

The antiknock property of compression ignition engine fuel can be improved by adding

A) Tetraethyl lead B) Trimethyl pentane C) Amyl nitrate D) Hexadecane

Discuss

Answer & Solution

Answer: Option C

Solution:

The antiknock property of compression ignition engine fuel can be improved by adding Amyl nitrate

Automobile Engineering MCQ Questions & Answers | Mechanical Engineering