Automobile Engineering MCQ Questions & Answers

51

The camshaft of a four stroke Diesel engine running at 1000 rpm will run at

A) 500 rpm B) 1000 rpm C) 2000 rpm D) 4000 rpm

Discuss

Answer & Solution

Answer: Option A

Solution:

The camshaft of a four stroke Diesel engine running at 1000 rpm will run at 500 rpm

52

The difference between DOT 3 and DOT 4 brake fluids is

A) DOT 4 fluids have a higher boiling point than DOT 3 fluid B) DOT 4 fluids have a lower boiling point than DOT 3 fluid C) DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life D) DOT 4 fluid is more resistant to freezing than DOT 3 fluid

Discuss

Answer & Solution

Answer: Option A

Solution:

The difference between DOT 3 and DOT 4 brake fluids is DOT 4 fluids have a higher boiling point than DOT 3 fluid

53

The condition that causes vapour locking in a brake system is

A) Overheating of the fluid due to frequent brake application B) Overcooling of the brakes during high speed driving C) Keeping the vehicle without use for an extended period D) An excessively high engine speed on a downhill road

Discuss

Answer & Solution

Answer: Option A

Solution:

vapour locking in a brake system is Overheating of the fluid due to frequent brake application

54

Which of the following symptom is caused as a result of brake disc run out?

A) Ineffectiveness of the brakes B) Judder during braking C) Localized wearing of the brake pads D) Rapid wearing of the brake pads

Discuss

Answer & Solution

Answer: Option B

Solution:

Judder during braking is caused as a result of brake disc run out

55

The octane rating of petrol commercially available is

A) 85 - 95 B) 95 - 100 C) 100 - 110 D) 110 - 125

Discuss

Answer & Solution

Answer: Option A

Solution:

The octane rating of petrol commercially available is 85 - 95

56

If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on

A) Too lean mixture B) Stoichiometric mixture C) Most economical mixture D) Too rich mixture

Discuss

Answer & Solution

Answer: Option D

Solution:

If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on Too rich mixture

57

A maintenance free battery

A) Has lead-antimony plate grid B) Has lead-calcium plate grid C) Does not contain acid D) Does not contain water

Discuss

Answer & Solution

Answer: Option B

Solution:

A maintenance free battery has lead-calcium plate grid

58

The correct way to rectify an imbalanced wheel is to

A) Adjust the tyre pressure B) Rotate the tyres C) Adjust the damper spring tension D) Attach appropriate weights to the wheel at appropriate positions

Discuss

Answer & Solution

Answer: Option D

Solution:

The correct way to rectify an imbalanced wheel is to Attach appropriate weights to the wheel at appropriate positions

59

The purpose of a balancer shaft is to

A) Balance the timing in the movement of the two groups of pistons B) Increase inertia force of the rotating crankshaft C) Reduce vibrations caused by the crankshaft rotation D) Adjusts the timing of the intake and exhaust valve openings

Discuss

Answer & Solution

Answer: Option C

Solution:

The purpose of a balancer shaft is to Reduce vibrations caused by the crankshaft rotation

60

An under-inflated tyre will wear the tread most

A) Near the centre B) Near the edges C) In the lateral direction D) In the cross direction

Discuss

Answer & Solution

Answer: Option B

Solution:

An under-inflated tyre will wear the tread most Near the edges

Automobile Engineering MCQ Questions & Answers | Mechanical Engineering