Heat Transfer - Interview Questions | Exam2Win

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

A. thermal conductivity

B. thermal diffusivity

C. density

D. dynamic viscosity

E. kuiematic viscosity.

Explanation:

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

A. conduction

B. convection

C. radiation

D. conduction and convection

E. convection and radiation.

Explanation:

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

A. Grashoff no. and Reynold no.

B. Grashoff no. and Prandtl no.

C. Prandtl no. and Reynold no.

D. Grashoff no., Prandtl no. and Reynold no.

E. none of the above.

Explanation:

49. The unit of overall coefficient of heat transfer is

A. kcal/m2

B. kcal/hr �C

C. kcal/m2 hr �C

D. acl/m hr �C

E. kcal/m3 hr �C.

Explanation:

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

A. grey body

B. brilliant white polished body

C. red hot body

D. black body

E. none of the above.

Explanation:

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