Mechanical Engineering MCQs

Page No. 105

The energy of molecular motion appears as________________?


aheat


bpotential energy


csurface tension


dfriction


View Answer heat

The unit’of universal gas constant is___________________?


awatts/°K


bdynes/°C


cergscm/°K


derg/°K


View Answer erg/°K

I kgf/cm2 is equal to________________?


a760 mm Hg


bzero mm Hg


c735.6 mm Hg


d1 mm Hg


View Answer 735.6 mm Hg

One barometric pressure or 1 atmospheric pressure is equal to___________________?


a1 kgf/cnr2


b1.033 kgf/cm2


c0 kgf/cm2


d1.0197 kgf/cm2


View Answer 1.033 kgf/cm2

A perpetual motion machine is___________________?


aa thermodynamic machine


ba non-thermodynamic machine


ca hypothetical machine


da hypothetical machine whose opera-tion would violate the laws of thermodynamics



According to Clausis statement of second law of thermodynamics___________________?


aheat can’t be transferred from low temperature source to high temperature source


bheat can be transferred for low temperature to high temperature source by using refrigeration cycle.


cheat can be transferred from low temperature to high temperature source if COP of process is more than unity


dheat can’t be transferred from low temperature to high temperature source without the aid of external energy



Which of the following is an irreversible cycle_____________________?


acarnot


bStirling


cericsson


dnone of the above


View Answer none of the above

The efficiency of a Carnot engine depends on_______________________?


aworking substance


bdesign of engine


csize of engine


dtemperatures of source and sink



The efficiency of Carnot cycle is maximum for_____________________?


agas engine


bwell lubricated engine


cpetrol engine


dreversible engine


View Answer reversible engine

Diesel cycle consists of following four processes_________________?


atwo isothermals and two isentropics


btwo isentropics, and two constant volumes.


ctwo isentropics, one constant volume and one constant pressure


dtwo isentropics and two constant pressures



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