Heat Transfer QUESTIONS AND ANSWERS

Mechanical Engineering : Heat Transfer QUESTIONS AND ANSWERS :: part2 : 21 to 25

Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :

21.In heat transfer, conductance equals conductivity (kcal/hr/sqm/�C/cm) divided by

hr (time)

sqm (area)

�C (temperature)

cm (thickness)

kcal (heat).

22.Thermal conductivity of glass-wool varies from sample to sample because of variation in

composition

density

porosity

structure

all of the above.

23.Moisture would find its way into insulation by vapour pressure unless it is prevented by

high thickness of insulation

high vapour pressure

less thermal conductivity insulator

a vapour seal

all of the above.

24.The amount of heat flow through a body by conduction is

directly proportional to the surface area of the body

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

dependent upon the material of the body

inversely proportional to the thickness of the body

all of the above.

25.Thermal diffusivity of a substance is .

proportional of thermal conductivity

inversely proportional to k

proportional to (kf

inversely proportional to k2

none of the above.

More Heat Transfer QUESTIONS AND ANSWERS available in next pages

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Mechanical Engineering Questions And Answers :: Heat Transfer: part2

Heat Transfer QUESTIONS AND ANSWERS

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