LMTD in case of counter flow heat exchanger as compared-to parallel flow heat exchanger is _________________?

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.

Question: A __________ evaporator employs an annular downtake.
[A].

basket type

[B].

horizontal

[C].

long tube vertical

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Dropwise condensation is promoted on a/an __________ surface.
[A].

glazed

[B].

oily

[C].

coated

[D].

smooth

Answer: Option B

Explanation:

No answer description available for this question.

Question: Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is
[A].

0.1

[B].

>1

[C].

< 1

[D].

l

Answer: Option A

Explanation:

No answer description available for this question.

Question: Mode of heat transfer involved in the cooling of air cooled internal combustion engine is
[A].

conduction

[B].

natural convection

[C].

forced convection

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.