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Mechanical Engineering MCQs with Explanations

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71Mechanical EngineeringMedium

A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water?

A10 m/sec

B250 m/sec

C50 m/sec

D2 m/sec

E25 m/sec

Correct answer

D. 2 m/sec

Explanation

The correct answer is 2 m/sec.

72Mechanical EngineeringMedium

In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is________?

Aslightly more than 95 mm

Bslightly less than 95 mm

C45 mm

Dnone of the above

E95 mm

Correct answer

B. slightly less than 95 mm

Explanation

The correct answer is slightly less than 95 mm.

73Mechanical EngineeringMedium

Rectilinear motion of piston is converted into rotary by________?

Aconnecting rod

Bfour bar chain mechanism

Cslider crank

Dcross head

Egudgeon pin

Correct answer

C. slider crank

Explanation

The correct answer is slider crank.

74Mechanical EngineeringMedium

The capacity of a compressor is 5 m /mih. 5 m /min refers to________?

Afree air

Bcompressed air

Cstandard air

Dcompressed air at delivery pressure

Eair sucked

Correct answer

A. free air

Explanation

The correct answer is free air.

75Mechanical EngineeringMedium

Basic shaft is one________?

Awhose upper deviation is zero

Bdoes not exist

Cnone of the above

Dwhose lower as well as upper deviations are zero

Ewhose lower deviation is zero

Correct answer

A. whose upper deviation is zero

Explanation

The correct answer is whose upper deviation is zero.

76Mechanical EngineeringMedium

A rocket engine for the combustion of its fuel________?

Auses surrounding air

Bcarries its own oxygen

Cdepends on electrical energy supplied by solar cells

Ddoes not require oxygen

Euses compressed atmospheric air

Correct answer

B. carries its own oxygen

Explanation

The correct answer is carries its own oxygen.

77Mechanical EngineeringMedium

What is the most common valve used in piping systems to throttle or regulate flow?

AButterfly valve

BGlobe valve

CPlug valve

DGate valve

Correct answer

B. Globe valve

Explanation

The correct answer is Globe valve.

78Mechanical EngineeringMedium

Two non-collinear parallel equal forces acting in opposite direction________?

Abalance each other

Bconstitute a resultant couple

Cconstitute a moment

Dconstitute a moment of couple

Econstitute a couple

Correct answer

E. constitute a couple

Explanation

The correct answer is constitute a couple.

79Mechanical EngineeringMedium

The ignition of charge by some hot surface in the engine cylinder before operation of spark plug is known as________?

Aauto ignition

Baccelerated ignition

Cpreignition

Dretarded ignition

Edetonation

Correct answer

C. preignition

Explanation

The correct answer is preignition.

80Mechanical EngineeringMedium

An alien bolt is________?

Aself locking bolt

Bused in high speed components

Cprovided with hexagonal depression in head

Dsame as stud

Eprovided with countersunk head

Correct answer

C. provided with hexagonal depression in head

Explanation

The correct answer is provided with hexagonal depression in head.

71Mechanical EngineeringMedium

A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water?

A10 m/sec

B250 m/sec

C50 m/sec

D2 m/sec

E25 m/sec

Correct answer

D. 2 m/sec

Explanation

The correct answer is 2 m/sec.

72Mechanical EngineeringMedium

In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is________?

Aslightly more than 95 mm

Bslightly less than 95 mm

C45 mm

Dnone of the above

E95 mm

Correct answer

B. slightly less than 95 mm

Explanation

The correct answer is slightly less than 95 mm.

73Mechanical EngineeringMedium

Rectilinear motion of piston is converted into rotary by________?

Aconnecting rod

Bfour bar chain mechanism

Cslider crank

Dcross head

Egudgeon pin

Correct answer

C. slider crank

Explanation

The correct answer is slider crank.

74Mechanical EngineeringMedium

The capacity of a compressor is 5 m /mih. 5 m /min refers to________?

Afree air

Bcompressed air

Cstandard air

Dcompressed air at delivery pressure

Eair sucked

Correct answer

A. free air

Explanation

The correct answer is free air.

75Mechanical EngineeringMedium

Basic shaft is one________?

Awhose upper deviation is zero

Bdoes not exist

Cnone of the above

Dwhose lower as well as upper deviations are zero

Ewhose lower deviation is zero

Correct answer

A. whose upper deviation is zero

Explanation

The correct answer is whose upper deviation is zero.

76Mechanical EngineeringMedium

A rocket engine for the combustion of its fuel________?

Auses surrounding air

Bcarries its own oxygen

Cdepends on electrical energy supplied by solar cells

Ddoes not require oxygen

Euses compressed atmospheric air

Correct answer

B. carries its own oxygen

Explanation

The correct answer is carries its own oxygen.

77Mechanical EngineeringMedium

What is the most common valve used in piping systems to throttle or regulate flow?

AButterfly valve

BGlobe valve

CPlug valve

DGate valve

Correct answer

B. Globe valve

Explanation

The correct answer is Globe valve.

78Mechanical EngineeringMedium

Two non-collinear parallel equal forces acting in opposite direction________?

Abalance each other

Bconstitute a resultant couple

Cconstitute a moment

Dconstitute a moment of couple

Econstitute a couple

Correct answer

E. constitute a couple

Explanation

The correct answer is constitute a couple.

79Mechanical EngineeringMedium

The ignition of charge by some hot surface in the engine cylinder before operation of spark plug is known as________?

Aauto ignition

Baccelerated ignition

Cpreignition

Dretarded ignition

Edetonation

Correct answer

C. preignition

Explanation

The correct answer is preignition.

80Mechanical EngineeringMedium

An alien bolt is________?

Aself locking bolt

Bused in high speed components

Cprovided with hexagonal depression in head

Dsame as stud

Eprovided with countersunk head

Correct answer

C. provided with hexagonal depression in head

Explanation

The correct answer is provided with hexagonal depression in head.