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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