Heat Transfer (3151909) MCQs

MCQs of Heat Exchangers

Showing 1 to 10 out of 32 Questions
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1.

The steam condenser in a thermal power plant is a heat exchanger of the type

(a)

direct contact
(b)

regenerator
(c)

recuperator
(d)

none of these
Answer:

Option (c)

2.

The normal automobile radiator is a heat exchanger of the type

(a)

direct contact
(b)

parallel flow
(c)

counter flow
(d)

cross flow
Answer:

Option (d)

3.

Choose the correct statement with respect to a counter-flow heat exchanger

(a)

both the fluids at the inlet are in their coldest state
(b)

both the fluids at the exit are in their hottest state
(c)

both the fluids at the inlet are in their hottest state
(d)

one fluid is hottest and the other is coldest at inlet
Answer:

Option (c)

4.

The requirement of transfer of a large heat is usually met by

(a)

increase the length of the tube
(b)

decreasing the diameter of the tube
(c)

increase the number of tubes
(d)

having multiple tube or shell passes
Answer:

Option (d)

5.

The shell of a tubular heat exchanger is provided with expansion bellows to

(a)

facilitate an increase in the length of the boiler shell 
(b)

impart structural strength to exchanger 
(c)

account for the uneven expansion of shell and tube bundles
(d)

reduce the pressure drop
Answer:

Option (c)

6.

In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in 

(a)

parallel flow
(b)

counter flow
(c)

cross flow
(d)

same in parallel, counter and cross flow arrangements
Answer:

Option (d)

7.

In a counter-flow heat exchanger, cold fluid enters at 30°C and leaves at 50°C, Whereas the hot fluid enters at 150°C and leaves at 130°C. The mean temperature difference for this case is

(a)

20°C
(b)

80°C
(c)

100°C
(d)

indeterminate
Answer:

Option (c)

8.

Multipass heat exchangers are used to

(a)

reduce the pressure drop 
(b)

get a compact unit 
(c)

obtain a high heat transfer coefficient 
(d)

facilitate a very large temperature drop through the tube wall
Answer:

Option (c)

9.

In a heat exchanger, the hot liquid enters with a temperature of 180°C and leaves at 160°C. The cooling fluid enters at 30°C and leaves at 110°C. The capacity ratio of the heat exchanger is

(a)

0.25
(b)

1.5
(c)

0.33
(d)

0.2
Answer:

Option (a)

10.

A cross-flow type air heater has an area of 50m2 the overall transfer coefficient is 100Wm2K and the heat capacity of both hot and cold stream is 1000WK . The value of NTU is

(a)

1000
(b)

500
(c)

5
(d)

0.2
Answer:

Option (c)

Showing 1 to 10 out of 32 Questions
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