21) Which one of the following is flow properly
a) Prandtl number
b) Reynolds number
c) Schmidt number
d) Lewis number
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
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
24) The unit of Stefan-Botlzman constant is
a) W/mK
b) W/m2K2
c) W/m2K4
d) W/mK2
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
26) Stefen-Boltzman’s law is application to
a) Grey body
b) White body
c) Black body
d) Any of the above
27) Dropwise condensation usually occurs on
a) glazed surface
b) smooth surface
c) oily surface
d) coated surface
28) The normal automobile radiator is a heat exchange of the type
a) direct contact
b) parallel flow
c) counter flow
d) cross flow
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