Heat & Mass Transfer MCQ Questions Answers Mechanical Engineering


21) Which one of the following is flow properly

a) Prandtl number

b) Reynolds number

c) Schmidt number

d) Lewis number

View Answer
Option – b)

22) For laminar flow in a tube for constant wall temperature Nusselt number is approximately equal to

a) 4.36

b) 3.66

c) 5.78

d) 2

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Option – b)

23) Wave length for maximum power is given by

a) Kirchoff’s law

b) Wein’s law

c) Fouries’s law

d) Stefen boltzman law

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Option – b)

24) The unit of Stefan-Botlzman constant is

a) W/mK

b) W/m2K2

c) W/m2K4

d) W/mK2

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Option – c)

25) The shape factor of a hemispherical body placed on a flat surface with respect to it self is

a) zero

b) 0.25

c) 0.5

d) 1

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Option – c)

26) Stefen-Boltzman’s law is application to

a) Grey body

b) White body

c) Black body

d) Any of the above

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Option – c)

27) Dropwise condensation usually occurs on

a) glazed surface
b) smooth surface

c) oily surface

d) coated surface

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Option – c)

28) The normal automobile radiator is a heat exchange of the type

a) direct contact

b) parallel flow

c) counter flow

d) cross flow

View Answer
Option – d)

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