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13.

Depending on the radiating properties, a body will be black when where a = absorptivity, p == reflectivity, X = transmissivity.

A.	p = 0, x = 0 and a = 1	B.	p= l,T = 0anda = 0
C.	p = 0, x = 1 and a = 0	D.	x = 0, a + p = 0

14.

Depending on the radiating properties, a body will be opaque when where a = absorptivity, p = reflectivity, X = transmissivity.

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

15.

Depending on the radiating properties, a body will be white when where a = absorptivity, p = reflectivity, x = transmissivity

A.	p = 0, x = 0 and a = 1	B.	p=l,T = 0anda = 0
C.	p = 0, x = 1 and a = 0	D.	x = 0, a + p = 1

16.

Emissivity of a white polished body in comparison to a black body is

A.	higher	B.	lower
C.	same	D.	depends upon the shape of body

17.

Film coefficient is defined as Inside diameter of tube

A.	Equivalent thickness of film	B.	Thermal conductivity Equivalent thickness of film Specific heat x Viscosity
C.	Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity	D.	Film coefficient x Inside diameter Thermal conductivity

18.

Fourier's law of heat conduction is valid for

A.	one dimensional cases only	B.	two dimensional cases only
C.	three dimensional cases only	D.	regular surfaces having non-uniform temperature gradients

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