Mechanical Engineering MCQs

Page No. 109

Measurement of temperature is based on_________________?


athermodynamic properties


bzeroth law of thermodynamics


cfirst law of thermodynamics


dsecond law of thermodynamics



Addition of heat at constant pressure to a gas results in________________?


araising its temperature


braising its pressure


craising its volume


draising its temperature and doing external work



Total heat of a substance is also known as __________________?


ainternal energy


bentropy


cthermal capacity


denthalpy


View Answer enthalpy

Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant_______________?


apressure


btemperature


cvolume


dinternal energy


View Answer volume

Isochoric process is one in which___________________?


afree expansion takes place


bvery little mechanical work is done by the system


cno mechanical work is done by the system


dall parameters remain constant



Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant________________?


apressure


btemperature


cvolume


dentropy


View Answer pressure

Energy can neither be created nor destroyed but can be converted from one form to other is inferred from_________________?


azeroth low of thermodynamic


bfirst law of thermodynamics


csecond law to thermodynamics


dbasic law of thermodynamics



Entropy change depends on___________________?


aheat transfer


bmass transfer


cchange of temperature


dthermodynamic state


View Answer heat transfer

A gas is compressed in a cylinder by a movable piston to a volume one-half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be___________________?


a300 Nm


b300,000 Nm


c30 Nm


d3000 Nm


View Answer 300,000 Nm

Minimum work in compressor is possible when the value of adiabatic index n is equal to_________________?


a0.75


b1


c1.27


d1.35


View Answer 1

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