Mechanical Engineering questions and answers

Mechanical Engineering Questions and Answers

Challenge your knowledge of machinery, prepare for your exams or aptitude tests with these Mechanical Engineering questions and answers.

41.

It is necessary to maintain the valve clearances as they

A.

reduce the resistance to sliding that occurs between the cam and the tappet

B.

allow for lengthening of the valves owing to the heat of combustion

C.

increase the speed at which the valves move up and down

D.

make the crankshaft turn smoothly

Correct answer is B

No explanation has been provided for this answer.

42.

What type of bearing is used for main bearings and connecting rod bearings ?

A.

Ballbearings

B.

Plain bearings

C.

Needle roller bearing

D.

Taper roller bearing

Correct answer is B

No explanation has been provided for this answer.

43.

A clutch is usually designed to transmit maximum torque which is

A.

equal to the maximum engine torque

B.

80 per cent of the maximum engine torque

C.

150 per cent of the maximum engine torque

D.

none of these

Correct answer is C

No explanation has been provided for this answer.

44.

The function of an alternator in an automobile is to

A.

supply electric power

B.

convert mechanical energy into electrical energy

C.

continually recharge the battery

D.

partly convert engine power into electric power

Correct answer is C

No explanation has been provided for this answer.

45.

If the engine coolant leaks into the engine oil, then engine oil

A.

appears milky

B.

becomes foamy

C.

turns black

D.

none of these

Correct answer is A

No explanation has been provided for this answer.

46.

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

Correct answer is B

No explanation has been provided for this answer.

47.

The motion of the cam is transferred to the valves through

A.

pistons

B.

rocker arms

C.

camshaft pulley

D.

valve stems

Correct answer is B

No explanation has been provided for this answer.

48.

A baffle plate is fitted inside the oil pan to prevent the oil from splashing when it is subjected to vibration and other movement during vehicle operation.

A.

True

B.

False

C.

Cannot say

D.

There's no baffle plate

Correct answer is A

No explanation has been provided for this answer.

49.

The portion of a crankshaft which rests on cylinder block is called main journal.

A.

True

B.

False

C.

Cannot say

D.

No part of crankshaft rests on cylinder block

Correct answer is A

No explanation has been provided for this answer.

50.

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

Correct answer is A

No explanation has been provided for this answer.