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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