Automobile Engineering MCQ Questions & Answers

91

The heat transfer from coolant to air in the radiator of an automobile engine takes place by

A) Radiation only B) Convention only C) Convection and radiation D) Conduction, convection and radiation

Discuss

Answer & Solution

Answer: Option C

Solution:

The heat transfer from coolant to air in the radiator of an automobile engine takes place by convection and radiation

92

The function of a radiator fan in the cooling system is that

A) It blows air through the radiator when necessary B) It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump C) It cools the engine by blowing air onto the cylinder block D) It draws heat out of the engine compartment

Discuss

Answer & Solution

Answer: Option A

Solution:

The Functions of a Radiator Fan It can push air through the radiator core or pull it through. It must cool the antifreeze that circulates through the block and head passages and reduces the engine temperature

93

A basic difference between the spark ignition engine and the Diesel engine is that the

A) Diesel engine compresses air alone instead of an air-fuel mixture B) Air temperature ignites the fuel in the Diesel engine C) Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke D) All of the above

Discuss

Answer & Solution

Answer: Option D

Solution:

A basic difference between the spark ignition engine and the Diesel engine is that the:
- Diesel engine compresses air alone instead of an air-fuel mixture
- Air temperature ignites the fuel in the Diesel engine
- Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke

94

The main function of intake manifold is that it

A) Promotes the mixture of air and fuel B) Reduces intake noise C) Cools the intake air to a suitable temperature D) Distributes intake air equally to the cylinders

Discuss

Answer & Solution

Answer: Option D

Solution:

The primary function of the intake manifold is to evenly distribute the combustion mixture (or just air in a direct injection engine) to each intake port in the cylinder head(s). Even distribution is important to optimize the efficiency and performance of the engine.

95

The clutch is located between the transmission and the

A) Engine B) Rear axle C) Propeller shaft D) Differential

Discuss

Answer & Solution

Answer: Option A

Solution:

The clutch is located between the transmission and the engine.

96

If a tyre is designated as 175/65 R-14 82-S, then the aspect ratio for the tyre is

A) 175 B) 65 C) 14 D) 82

Discuss

Answer & Solution

Answer: Option B

Solution:

If a tyre is designated as 175/65 R-14 82-S, then the aspect ratio for the tyre is 65

97

The component that connects the steering rack to the knuckles is

A) Tie rod B) Sector gear C) Pivot D) Spline

Discuss

Answer & Solution

Answer: Option A

Solution:

The component that connects the steering rack to the knuckles is Tie rod.

98

The painting of automobiles is done to

A) Prevent rust from growing on the body B) Improve its external appearance C) Retain the characteristics of steel for long D) All of these

Discuss

Answer & Solution

Answer: Option D

Solution:

The painting of automobiles is done to
- Prevent rust from growing on the body
- Improve its external appearance
- Retain the characteristics of steel for long

99

The advantage of having a tandem master cylinder arrangement in automobiles is that it

A) Enhances safety by serving two independent lines in a divided line brake circuit B) Enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss C) Supplies equal fluid pressure to each line of a divided line brake circuit, thereby preventing the brakes from dragging on one side D) Boosts the brake fluid pressure to reduce the force required to depress the brake pedal

Discuss

Answer & Solution

Answer: Option A

Solution:

The advantage of having a tandem master cylinder arrangement in automobiles is that it enhances safety by serving two independent lines in a divided line brake circuit.

100

The condition that results in large quantities of CO emission is

A) Insufficient air during combustion B) Insufficient fuel during combustion C) Low temperature combustion D) High temperature combustion

Discuss

Answer & Solution

Answer: Option A

Solution:

The condition that results in large quantities of CO emission is insufficient air during combustion.

Automobile Engineering MCQ Questions & Answers | Mechanical Engineering