Heat Exchangers and Mass Transfer MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Heat Exchangers and Mass Transfer, a fundamental topic in the field of Heat Transfer. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Heat Exchangers and Mass Transfer MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Heat Exchangers and Mass Transfer mcq questions that explore various aspects of Heat Exchangers and Mass Transfer problems. Each MCQ is crafted to challenge your understanding of Heat Exchangers and Mass Transfer principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Heat Transfer tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Heat Exchangers and Mass Transfer MCQs are your pathway to success in mastering this essential Heat Transfer topic.

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Heat Exchangers and Mass Transfer MCQs | Page 5 of 7

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Q41.
What is the value of overall heat transfer coefficient for steam condensers?

a.

200-9000 W/m² K

b.

3000-5500 W/m² K

c.

2000-9500 W/m² K

d.

1500-5000 W/m² K

Discuss
Answer: (d).1500-5000 W/m² K
Q42.
Capacity ratio is defined as the product of

a.

Mass and temperature

b.

Mass and specific heat

c.

Specific heat and temperature

d.

Time and temperature

Discuss
Answer: (b).Mass and specific heat
Q43.
Which of the following is not associated with heat exchanger?

a.

Fouling

b.

NTU

c.

Capacity ratio

d.

Mc Adam’s correction factor

Discuss
Answer: (d).Mc Adam’s correction factor
Q44.
The engine oil at 150 degree Celsius is cooled to 80 degree Celsius in a parallel flow heat exchanger by water entering at 25 degree Celsius and leaving at 60 degree Celsius. Estimate the exchanger effectiveness

a.

0.56

b.

0.66

c.

0.76

d.

0.86

Discuss
Answer: (a).0.56
Q45.
In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m² hr degree. Find the effectiveness of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg K

a.

0.224

b.

0.706

c.

2.224

d.

3.224

Discuss
Answer: (b).0.706
Q46.
For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference for parallel flow is

a.

Does not depend on counter flow

b.

Smaller than counter flow

c.

Greater than counter flow

d.

Equal to counter flow

Discuss
Answer: (d).Equal to counter flow
Q47.
Water (specific heat = 4 k J/kg K) enters a cross flow exchanger (both fluids unmixed) at 15 degree Celsius and flows at the rate of 7.5 kg/s. It cools air (C P = 1 k J/kg K) flowing at the rate of 10 kg/s from an inlet temperature of 120 degree Celsius. For an overall heat transfer coefficient of 780 k J/m² hr degree and the surface area is 240 m², determine the NTU

a.

4.2

b.

5.2

c.

6.2

d.

7.2

Discuss
Answer: (b).5.2
Q48.
Pick the odd one out.

a.

Open feed water heaters

b.

Jet condensers

c.

De-super heaters

d.

Surface condensers

Discuss
Answer: (d).Surface condensers
Q49.
A cross flow type air heater has an area of 50 cm². The overall heat transfer coefficient is 100 W/m² K and heat capacity of both hot and cold stream is 1000 W/m K. The value of NTU is

a.

1000

b.

500

c.

5

d.

0.2

Discuss
Answer: (b).500
Q50.
After expansion from a gas turbine, the hot exhaust gases are used to heat the compressed air from a compressor with the help of a cross flow heat exchanger of 0.8 effectiveness. What is the number of transfer units of the heat exchanger?

a.

2

b.

4

c.

8

d.

16

Discuss
Answer: (b).4
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