Category

Mechanical Engineering MCQs


The chemical used in breather is_______________?


aasbestos fiber

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b silica sand

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c sodium chloride

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d silica gel

✓


View Answer silica gel

Who first introduced solid media_______________?


aLouis pasteur

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bRobert koch

✓


cHensen

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dOgston

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View Answer Robert koch

Atmospheric pressure is equal to____________?


a1.013 bar

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b760mm of Hg

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c101.3KN/m2

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dAll of these

✓


View Answer All of these

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


aGlobe valve

✓


bGate valve

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cButterfly valve

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dPlug valve

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View Answer Globe valve

Ball valves are commonly used to_________?


athrottle flow

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bcheck flow

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cchange flow direction

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dstart/stop flow

✓


View Answer start/stop flow

Which tool is used to measure gap size in a rough alignment?


aInside caliper

✓


bDial indicator

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cFeeler gage

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dMeasuring tape

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View Answer Inside caliper

The part of the coupling that actually transmits power and rotation from one shaft to the other shaft is_________?


agap

✖


bhub

✓


ckey

✖


ddriver

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View Answer hub

The stress developed in a material at breaking point in extension is called__________?


aBreaking stress

✓


bFracture stress

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cYield point stress

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dProof stress

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View Answer Breaking stress

Which is not correct statement about effect of sulphur in fuel ___________________?


ait has heating value

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bit helps in electrostatic precipitation of ash in flue-gases

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cit leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low

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dit erodes furnace walls

✓


View Answer it erodes furnace walls

Which is not the correct statement about moisture in coal ______________________?


ainherent moisture and surface mois¬ture are different things

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bin some coals moisture may be present upto 40%

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csome moisture in coal helps in better burning which is not possible with completely dry coal

✖


dit increases thermal efficiency

✓


View Answer it increases thermal efficiency

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