Mechanical Engineering MCQs

Page No. 154

Thermal diffusivity is ____________________?


aa dimensionless parameter


bfunction of temperature


cused as mathematical model


da physical property of the material



Moisture would find its way into insulation by vapour pressure unless it is prevented by __________________ ?


ahigh thickness of insulation


bhigh vapour pressure


cless thermal conductivity insulator


da vapour seal


View Answer a vapour seal

Heat transfer by radiation mainly depends upon___________________?


aits temperature


bnature of the body


ckind and extent of its surface


dall of the above


View Answer all of the above

Which of the following has maximum value of thermal conductivity________________?


aaluminium


bsteel


cbrass


dcopper


View Answer aluminium

The amount of heat flow through a body by conduction is_______________?


adirectly proportional to the surface area of the body


bdirectly proportional to the temperature difference on the two faces of the body


cdependent upon the material of the body


dall of the above


View Answer all of the above

Heat flows from one body to other when they have_________________?


adifferent heat contents


bdifferent specific heat


cdifferent atomic structure


ddifferent temperatures



Which of the following has least value of conductivity_________________?


aglass


bwater


cplastic


dair


View Answer air

Thermal conductivity of glass-wool varies from sample to sample because of variation in ________________ ?


acomposition


bdensity


cporosity


dall of the above


View Answer all of the above

According to Prevost theory of heat exchange ___________________?


ait is impossible to transfer heat from low temperature source to t high temperature source


bheat transfer by radiation requires no medium


call bodies above absolute zero emit radiation


dheat transfer in most of the cases takes place by combination of conduction, convection and radiation



Thermal diffusivity of a substance is ____________________?


aproportional of thermal conductivity


binversely proportional to k


cproportional to (k)


dinversely proportional to k2



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