Mechanical Engineering Questions And Answers :: Heat Transfer: part3



Mechanical Engineering : Heat Transfer QUESTIONS AND ANSWERS :: part3 : 1 to 5

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

1.Which of the following property of air does not increase with rise in temperature

thermal conductivity
thermal diffusivity
density
dynamic viscosity
kuiematic viscosity.

2.The concept of overall coefficient of heat transfer is used in case of heat transfer by

conduction
convection
radiation
conduction and convection
convection and radiation.

3.In free con-vection heat transfer, Nusselt number is function of

Grashoff no. and Reynold no.
Grashoff no. and Prandtl no.
Prandtl no. and Reynold no.
Grashoff no., Prandtl no. and Reynold no.
none of the above.

4.The unit of overall coefficient of heat transfer is

kcal/m2
kcal/hr �C
kcal/m2 hr �C
acl/m hr �C
kcal/m3 hr �C.

5.According to Kirchoff's law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a

grey body
brilliant white polished body
red hot body
black body
none of the above.

More Heat Transfer QUESTIONS AND ANSWERS available in next pages

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