Heat Transfer - Interview Questions | Exam2Win

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81. Depending on the radiating properties, a body will be opaque when

A. p = 0, x = 0 and a = 1

B. p=l,x = 0anda = 0

C. p = 0, x = 1 and a = 0

D. x - 0, a + p = 1

E. a=0,x + p= 1.

Explanation:

82. In re generator type heat exchanger, heat transfer takes place by

A. direct mixing of hot and cold fluids

B. a complete separation between hot and cold fluids

C. flow of hot and cold fluids alternately over a surface

D. generation of heat again and again

E. indirect transfer.

Explanation:

83. The amount of radiation mainly depends on

A. nature of body

B. temperature of body

C. type of surface of body

D. all of the above

E. none of the above.

Explanation:

84. A grey body is one whose absorptivity

A. varies with temperature

B. varies with the wave length of incident ray

C. varies with both

D. does not vary with temperature and wave length of the incident ray

E. there is no such criterion.

Explanation:

85. The emissive power of a body depends upon its

A. temperature

B. wave length

C. physical nature

D. all of the above

E. none of the above.

Explanation:

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