Mechanical Engineering MCQs

Page No. 103

If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as__________________?


afree expansion


bhyperbolic expansion


cadiabatic expansion


dthrottling


View Answer throttling

If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called___________________?


afree expansion


bhyperbolic expansion


cadiabatic expansion


dparabolic expansion


View Answer free expansion

Which of the following processes is irreversible process___________________?


aisothermal


badiabatic


cthrottling


dall of the above


View Answer throttling

For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be___________________?


azero


bminimum


cmaximum


dinfinity


View Answer zero

Molecular volume of any perfect gas at 600 x 103 N/m2 and 27°C will be ____________________?


a4.17m3/kgmol


b400 m3/kg mol


c0.15 m3/kg mol


d41.7 m3/kg mol


View Answer 4.17m3/kgmol

The more effective way of increasing efficiency of Carnot engine is to____________________?


aincrease higher temperature


bdecrease higher temperature


cincrease lower temperature


ddecrease lower temperature



For reversible adiabatic process, change in entropy is_________________?


amaximum


bminimum


czero


dunpredictable


View Answer zero

According to first law of thermodynamics__________________?


awork done by a system is equal to heat transferred by the system


btotal internal energy of a system during a process remains constant


cinternal energy, enthalpy and entropy during a process remain constant


dtotal energy of a system remains constant



First law of thermodynamics furnishes the relationship between______________________?


aheat and work


bheat, work and properties of the system


cvarious properties of the system


dvarious thermodynamic processes



In an isothermal process, the internal energy________________?


aincreases


bdecreases


cremains constant


dfirst increases and then decreases


View Answer remains constant

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