Engineering :: Heat Transfer

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91.

The units of the Stefan-Boltzmann canstant (?) are

A.	W/(m2.K)	B.	W/(m2.K4)
C.	W/m2	D.	W/(m.K4)

92.

The value of the Stefan-Baltzmann constant (?) is 0.1714 x 10-8 Btu/(hr.ft.2?R4). What is its value in W/m2.K4)?

A.	0.1714 x 10-8	B.	5.6697 x 10-6
C.	5.6697 x 10-8	D.	0.1714 x 10-6

93.

Heat transfer rate by radiation depends on

A.	the distance between the heat source and the object receiving the heat	B.	the surface area and temperature of the heat source
C.	the type of absorbing surface	D.	all of the above

94.

As the distance between the heat source and the object receiving the heat increases the rate of heat transfer by rediation

A.	remains constant	B.	increases
C.	decreases	D.	increases linearly

95.

Storage tanks for petroleum products are usually painted. Which paint would be used for a tank used for storage of gasoline?

A.	White lead paint	B.	Black matte paint
C.	Grey paint	D.	Light cream paint

96.

Which of the tanks below would heat up the most from the radiation from the sun?

A.	A tank painted with light cream paint	B.	A tank painted with white lead paint
C.	A tank painted with black matte paint	D.	A tank painted with grey paint

97.

Absorption coefficient is minimum for

A.	white lead paint	B.	light cream paint
C.	grey paint	D.	black matte paint

98.

Absorption coefficient is minimum for

A.	white lead paint	B.	grey paint
C.	light cream paint	D.	black matte paint

99.

Absorption coefficient is maximum for

A.	aluminium plate	B.	steel
C.	furnace refractories	D.	carbon lamp black

100.

Absorption coefficient is minimum for

A.	carbon lampblack	B.	steel
C.	aluminium plate	D.	furnace refractories