Intermittant tube cleaning is possible to be done in case of a __________ evaporator.

Question: In the equation Q = UAΔt; Δt is
[A].

geometric mean temperature difference.

[B].

arithmetic mean temperature difference.

[C].

logarithmic mean temperature difference.

[D].

the difference of average bulk temperatures of hot and cold fluids.

Answer: Option C

Explanation:

No answer description available for this question.

Question: In sub-cooled boiling,
[A].

temperature of the heating surface is less than the boiling point of the liquid.

[B].

temperature of the heating surface is more than the boiling point of the liquid.

[C].

bubbles from heating surface are absorbed by the mass of the liquid.

[D].

very large vapour space is necessary.

Answer: Option B

Explanation:

No answer description available for this question.

Question: A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.
[A].

10

[B].

>10

[C].

<10

[D].

either (b) or (c), depends on the mass of the body

Answer: Option B

Explanation:

No answer description available for this question.