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Mechanical Engineering MCQs with Explanations

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1171Mechanical EngineeringMedium

Barometer is used to measure________?

Arain level

very low pressure

Catmospheric pressure

Dpressure in pipes, channels etc.

Edifference of pressure between two points

Correct answer

C. atmospheric pressure

Explanation

The correct answer is atmospheric pressure.

1172Mechanical EngineeringMedium

In vapour compression cycle, the conditii of refrigerant is saturated liquid________?

Abefore entering the compressor

Bafter passing through the expansion throttle valve

Cbefore entering the expansion valve

Dafter passing through the condenser

Ebefore passing through the condensei

Correct answer

D. after passing through the condenser

Explanation

The correct answer is after passing through the condenser.

1173Mechanical EngineeringMedium

Which of the following is not the unit of power?

Akg m/sec

BkW (kilowatt)

Ckcal/kg sec

Dhp (horse power)

Ekcal/sec

Correct answer

C. kcal/kg sec

Explanation

The correct answer is kcal/kg sec.

1174Mechanical EngineeringMedium

The percentage of carbon in pig iron varies from________?

A4.5 to 6.3%.

B1.5 to 2.5%

C4 to 4.5%

D2.5 to 4%

E0.1 to 1.2%

Correct answer

C. 4 to 4.5%

Explanation

The correct answer is 4 to 4.5%.

1175Mechanical EngineeringMedium

Slow plastic defomiation of metals under a constant stress is known as________?

Acreep

Bnon-plastic deformation

Cendurance

Dplastic deformation

Efatigue

Correct answer

A. creep

Explanation

The correct answer is creep.

1176Mechanical EngineeringMedium

Drop forging dies contain carbon of the order of________?

A0.7 to 0.9%

B0.25 to 0.5%

C0.6 to 0.7%

D0.1 to 0.2%

E1.0 to 1.2%.

Correct answer

C. 0.6 to 0.7%

Explanation

The correct answer is 0.6 to 0.7%.

1177Mechanical EngineeringMedium

Which of the following instrument can be used for measuring speed of an aeroplane________?

AOrifice plate

Brotameter

Cpitot tube

Dhot wire anemometer

EVenturimeter

Correct answer

C. pitot tube

Explanation

The correct answer is pitot tube.

1178Mechanical EngineeringMedium

Hardness of upper bainite (acicular structure) is about________?

ARC 65

BRC 32.

CRC 80

DRC 48

ERC 57

Correct answer

D. RC 48

Explanation

The correct answer is RC 48.

1179Mechanical EngineeringMedium

Carbon in iron is an example of________?

Aintermetallic compounds

Ball of the above

Csubstitutional solution

Dinterstitial solid solution

Enone of the above.

Correct answer

D. interstitial solid solution

Explanation

The correct answer is interstitial solid solution.

1180Mechanical EngineeringMedium

The door of a running refrigerator inside a room was left open________?

AThe room will be gradually warmed up.

BThe room will be cooled very slightly.

CThe temperature of the air in room will remain unaffected.

Dany one of above is possible depending on the capacity

EThe room will be cooled to the temperature inside the refrigerator.

Correct answer

A. The room will be gradually warmed up.

Explanation

The correct answer is The room will be gradually warmed up..

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