Heat transfer by radiation mainly depends upon___________________?

Question: A hot body will radiate heat most rapidly, if its surface is
[A].

white & rough

[B].

black & rough

[C].

white & polished

[D].

black & polished

Answer: Option B

Explanation:

No answer description available for this question.

Question: In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred
[A].

through a metallic wall.

[B].

by direct contact of hot flue gas with air.

[C].

by heating an intermediate material (like chequor bricks) and then heating the air from this hot material.

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.
[A].

1

[B].

10

[C].

20

[D].

30

Answer: Option A

Explanation:

No answer description available for this question.

Question: Boiling point elevation of an ideal solution
[A].

increases rapidly with temperature rise.

[B].

decreases rapidly with temperature rise

[C].

in independent of pressure.

[D].

both (b) and (c).

Answer: Option A

Explanation:

No answer description available for this question.