Mechanical Engineering MCQs

Page No. 110

In order that a cycle be reversible, following must be satisfied ________________?


afree expansion or friction resisted expansion/compression process should not be encountered


bwhen heat is being absorbed, temperature of hot source and working sub¬stance should be same


cwhen beat is being rejected, temperature of cold source and working sub-stance should be same


dall of the above


View Answer all of the above

Which of the following processes are thermodynamically reversible___________________?


athrottling


bfree expansion


cconstant volume and constant pressure


disothermal and adiabatic



The specific heat of air increases with increase in __________________?


atemperature


bpressure


cboth pressure and temperature


dvariation of its constituents


View Answer temperature

In a free expansion process___________________?


awork done is zero


bheat transfer is zero


cboth A. and B. above


dwork done is zero but heat increases


View Answer both A. and B. above

The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is________________?


a29.27 J/kmol°K


b83.14J/kmol°K


c848J/kmol°K


dAll J/kmol °K


View Answer 83.14J/kmol°K

On volume basis, air contains following parts of oxygen _____________________?


a21


b23


c25


d77


View Answer 21

In a non-flow reversible process for which p = (- 3V+ 15) x 105N/m2,V changes from 1 m to 2 m3. The work done will be about_______________?


a100 xlOO5 joules


blxlO5 joules


c10 xlO5 joules


d10 xlO5 kilo joules


View Answer 10 xlO5 joules

Work done is zero for the following process_________________?


aconstant volume


bfree expansion


cthrottling


dall Of the above


View Answer all Of the above

The basis for measuring thermodynamic property of temperature is given by___________________?


azeroth law of thermodynamics


bfirst law of thermodynamics


csecond law of thermodynamics


dthird law of thermodynamics



Zeroth law of thermodynamics________________?


adeals with conversion of mass and energy


bdeals with reversibility and irreversibility of process


cstates that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other


ddeals with heat engines



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