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Question: Corrosiveness of steam condensate is due to the presence of
[A].

CO2

[B].

dissolved O2

[C].

both (a) & (b)

[D].

neither (a) nor (b)

Answer: Option C

Explanation:

No answer description available for this question.

Question: In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is
[A].

infinity.

[B].

zero.

[C].

same as average heat transfer co-efficient for tube side.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )
[A].

(ΔT)2

[B].

ΔT

[C].

(ΔT)1/4

[D].

(ΔT)3/2

Answer: Option C

Explanation:

No answer description available for this question.

Question: At what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical ?
[A].

0.5

[B].

1

[C].

1.5

[D].

80

Answer: Option B

Explanation:

No answer description available for this question.

Question: Conductance is given by(where, x = thickness, A = heat flow area, K = thermal conductivity.)
[A].

x/KA

[B].

KA/x

[C].

K/Ax

[D].

A/Kx

Answer: Option B

Explanation:

No answer description available for this question.

Question: In SI units, fouling factor is expressed in
[A].

m2°K/W

[B].

W/m2°K

[C].

m2°K

[D].

m°K/W

Answer: Option A

Explanation:

No answer description available for this question.

Question: In SI units, thermal conductivity is expressed in
[A].

Watt/m.°K

[B].

Watt/m2. °K

[C].

Watt/m2. °K

[D].

Watt/m4. °K

Answer: Option A

Explanation:

No answer description available for this question.

Question: Circulation pump is located below the evaporater to
[A].

avoid cavitation.

[B].

avoid frequent priming.

[C].

create more suction head.

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Evaporator tubes are generally
[A].

horizontal

[B].

vertical

[C].

inclined

[D].

random

Answer: Option B

Explanation:

No answer description available for this question.

Question: LMTD can’t be used as such without a correction factor for the
[A].

multipass heat exchanger.

[B].

baffled heat exchanger.

[C].

condensation of mixed vapour in a condenser.

[D].

all (a) (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.