Mechanical Engineering MCQs

Page No. 108

Barometric pressure is equal to_____________________?


a760 mm Hg

✓


bzero mm Hg

✖


c735.6 mm Hg

✖


d1 mm Hg

✖


View Answer 760 mm Hg

Calorie is a measure of


aspecific heat

✖


bquantity of heat

✓


cthermal capacity

✖


dentropy

✖


View Answer quantity of heat

A sudden fall in the barometer reading is a sign of approaching________________?


afine weather

✖


brains

✖


cstorm

✓


dcold wave

✖


View Answer storm

During throttling process___________________?


aheat exchange does not take place

✖


bno work is done by expanding steam

✖


cthere is no change of internal energy of steam

✖


dall of the above

✓


View Answer all of the above

Compressed air coming out from a punctured football___________________?


abecomes hotter

✖


bbecomes cooler1

✓


cremains at the same temperature

✖


dmay become hotter or cooler depend-ing upon the humidity of the surround¬ing air

✖


View Answer becomes cooler1

An adiabatic wall is one which__________________?


aprevents thermal interaction

✓


bpermits thermal interaction

✖


cencourages thermal interaction

✖


ddiscourages thermal interaction

✖



In a Carnot cycle, heat is transferred at_______________________?


aconstant pressure

✖


bconstant volume

✖


cconstant temperature

✓


dconstant enthaply

✖


View Answer constant temperature

An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is___________________?


afeasible

✖


bimpossible

✖


cpossible

✖


dpossible, but with lot of sophistications

✓



If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly_________________?


atemperature

✖


benthalpy

✖


cinternal energy

✖


dentropy

✓


View Answer entropy

Carnot cycle efficiency is maximum when______________?


ainitial temperature is 0°K

✖


bfinal temperature is 0°K

✓


cdifference between initial and final temperature is 0°K

✖


dfinal temperature is 0°C

✖



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