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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