MCQs

Mechanical Engineering MCQs with Explanations

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891Mechanical EngineeringMedium

What does symbol ‘V’ employ in work study________?

Adelay/ temporary Storage

Bnone of the above

Cpermanent storage

Dinspection

Eoperation

Correct answer

C. permanent storage

Explanation

The correct answer is permanent storage.

892Mechanical EngineeringMedium

Ammonia-absorption refrigeration cycle requires________?

Avery little work input

Bnone of the above

Cmaximum work input

Dnearly same work input as for vapour compression cycle

Ezero work input

Correct answer

A. very little work input

Explanation

The correct answer is very little work input.

893Mechanical EngineeringMedium

In petrol engine, increase of cooling water temperature will________?

Aincrease or decrease knocking tendency depedning on strength and time of spark

Bincrease the knocking tendency

Cunpredictable

Dnot affect the knocking tendency

Edecrease the knocking tendecny

Correct answer

B. increase the knocking tendency

Explanation

The correct answer is increase the knocking tendency.

894Mechanical EngineeringMedium

An ideal air compressor cycle without clearance on p-v diagram can be represented by following processes________?

Atwo isobaric, two adiabatic and one constant volume

Btwo adiabatic and two isobaric

Ctwo adiabatic, one isobaric and one constant volume

Done adiabatic, two isobaric, and one constant volume

Eone adiabatic, one isobaric and two constant volume

Correct answer

D. one adiabatic, two isobaric, and one constant volume

Explanation

The correct answer is one adiabatic, two isobaric, and one constant volume.

895Mechanical EngineeringMedium

In locomotives, the draught is produced by________?

Achimney

Bsteam jet draught

Cboth combined A. and B.

Dnone of the above

Einduced draft fan

Correct answer

B. steam jet draught

Explanation

The correct answer is steam jet draught.

896Mechanical EngineeringMedium

Queuing theory is associated with ________?

Awaiting time

Bproduction time

Csales

Dinventory

Einspection time

Correct answer

A. waiting time

Explanation

The correct answer is waiting time.

897Mechanical EngineeringMedium

The vapor compression refrigerator employs the following cycle________?

AReversed Rankine

BCarnot

CRankine

DReversed Carnot

EBrayton

Correct answer

D. Reversed Carnot

Explanation

The correct answer is Reversed Carnot.

898Mechanical EngineeringMedium

Which is the false statement about the properties of instantaneous center________?

Athe double centre can be denoted either by 02 or Ol2, but proper selection should be made

Bthe two rigid links have no linear velocities relative to each other at the instantaneous centre

Cthe two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link

Dnone of the above

Eat the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered

Correct answer

A. the double centre can be denoted either by 02 or Ol2, but proper selection should be made

Explanation

The correct answer is the double centre can be denoted either by 02 or Ol2, but proper selection should be made.

899Mechanical EngineeringMedium

Kinematic pairs are those which have two elements that ________?

Ahave dynamic forces

Bare held together

Cpermit relative motion

Dhave line contact

Ehave surface contact

Correct answer

C. permit relative motion

Explanation

The correct answer is permit relative motion.

900Mechanical EngineeringMedium

Incomplete combustion can be best judged by________?

Ameasuring oxygen in flue gases

Bsmoky chimney exit

Cexcess air in flue gases

Dmeasuring carbon mono-oxide in flue gases

Emeasuring temperature of flue gases at exit of furnace

Correct answer

D. measuring carbon mono-oxide in flue gases

Explanation

The correct answer is measuring carbon mono-oxide in flue gases.

In petrol engine, increase of cooling water temperature will________?

Aincrease or decrease knocking tendency depedning on strength and time of spark

Bincrease the knocking tendency

Cunpredictable

Dnot affect the knocking tendency

Edecrease the knocking tendecny

Correct answer

B. increase the knocking tendency

Explanation

The correct answer is increase the knocking tendency.

An ideal air compressor cycle without clearance on p-v diagram can be represented by following processes________?

Atwo isobaric, two adiabatic and one constant volume

Btwo adiabatic and two isobaric

Ctwo adiabatic, one isobaric and one constant volume

Done adiabatic, two isobaric, and one constant volume

Eone adiabatic, one isobaric and two constant volume

Correct answer

D. one adiabatic, two isobaric, and one constant volume

Explanation

The correct answer is one adiabatic, two isobaric, and one constant volume.

Which is the false statement about the properties of instantaneous center________?

Athe double centre can be denoted either by 02 or Ol2, but proper selection should be made

Bthe two rigid links have no linear velocities relative to each other at the instantaneous centre

Cthe two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link

Dnone of the above

Eat the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered

Correct answer

A. the double centre can be denoted either by 02 or Ol2, but proper selection should be made

Explanation

The correct answer is the double centre can be denoted either by 02 or Ol2, but proper selection should be made.

Incomplete combustion can be best judged by________?

Ameasuring oxygen in flue gases

Bsmoky chimney exit

Cexcess air in flue gases

Dmeasuring carbon mono-oxide in flue gases

Emeasuring temperature of flue gases at exit of furnace

Correct answer

D. measuring carbon mono-oxide in flue gases

Explanation

The correct answer is measuring carbon mono-oxide in flue gases.