Automobile Engineering MCQ Questions & Answers

41

The main function of an exhaust muffler is the

A) Optimization of exhaust efficiency B) Reduction of exhaust noise C) Reduction of nitrogen oxide in the exhaust gases D) Reduction of the exhaust gas volume

Discuss

Answer & Solution

Answer: Option B

Solution:

The function of a Muffler or a Silencer in Vehicle is to cool the exhaust gases by expansion through it and to reduce the noise of outgoing gases.
The exhaust gases must be discharged into the atmosphere with minimum restriction. The restriction in flow of exhaust gases causes back pressure.

42

The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

A) Enable the pump's fault diagnosis function to operate B) Warm up and lubricate the pump C) Supplies a large amount of fuel and thereby creates a choke effect D) Pressurise the fuel system before the engine is started

Discuss

Answer & Solution

Answer: Option D

Solution:

The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to Pressurise the fuel system before the engine is started

43

The information provided by the oxygen (O₂) sensor to the feedback control system is about the

A) Air-fuel ratio B) Air temperature C) Air flow speed D) Exhaust gas volume

Discuss

Answer & Solution

Answer: Option A

Solution:

The information provided by the oxygen (O₂) sensor to the feedback control system is about the Air-fuel ratio.

44

In a forced feed lubrication system, the device used to guard against excessive oil pressure, is known as

A) Release chamber B) Balancer C) Relief valve D) Stop valve

Discuss

Answer & Solution

Answer: Option C

Solution:

In a forced feed lubrication system, the device used to guard against excessive oil pressure, is known as Relief valve

45

The fuel pump in the programmed fuel injection (PFI) system is located

A) Between the fuel filler pipe and fuel tank B) In the fuel tank C) On the distributor mounting in the engine compartment D) On the engine compartment bulkhead

Discuss

Answer & Solution

Answer: Option B

Solution:

The fuel pump in the programmed fuel injection (PFI) system is located In the fuel tank

46

The function of positive crankcase ventilation (PCV) system is that it

A) Mixes fuel with air B) Promotes combustion by creating a swirling movement in the air-fuel mixture C) Returns blow by gases from the crankcase to the intake system D) Feeds blow by gases to the exhaust manifold

Discuss

Answer & Solution

Answer: Option C

Solution:

The function of positive crankcase ventilation (PCV) system is that it returns blow by gases from the crankcase to the intake system

47

The basic purpose of a four wheel drive (4WD) system is that it

A) Delivers improved cornering on dry road surfaces B) Eliminates the need of snow tyres, tyre chains, etc. C) Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces D) Ensures that effective braking can be performed, even on slippery surfaces

Discuss

Answer & Solution

Answer: Option C

Solution:

The basic purpose of a four wheel drive (4WD) system is that it Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces

48

The air resistance to a car at 20 kmph is R. The air resistance at 40 kmph will be

A) R B) 2R C) 4R D) 4R²

Discuss

Answer & Solution

Answer: Option C

Solution:

R = K × A × V² when vehicle speed is about 20 km/hr
Where K = Co-efficient of air resistance
A = Projected area of vehicle
V = Vehicle speed in km/hr
When vehicle speed is about 40 km/hr, speed is doubled so we can write V = 2V
Therefore, R = K × A × (2V)²
R = K × A × 4V²
R = 4K × A × V²
R = 4R

49

Which part of the automobile tyre is subjected to greatest flexing action?

A) Bead B) Side wall C) Shoulder D) Tread

Discuss

Answer & Solution

Answer: Option B

Solution:

Side wall of tyre is subjected to greatest flexing action.

50

When a gear box has four forward speeds and one reverse speed, it is said to be a

A) 3-speed gear box B) 4-speed gear box C) 5-speed gear box D) 6-speed gear box

Discuss

Answer & Solution

Answer: Option B

Solution:

When a gear box has four forward speeds and one reverse speed, it is said to be a 4-speed gear box

Automobile Engineering MCQ Questions & Answers | Mechanical Engineering