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 2 of 7

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Q11.
Identify the correct expression for effectiveness

a.

4 – exponential (- NTU)

b.

3 – exponential (- NTU)

c.

2 – exponential (- NTU)

d.

1 – exponential (- NTU)

Discuss
Answer: (d).1 – exponential (- NTU)
Q12.
In a gas turbine recuperator, the capacity ratio becomes

a.

2

b.

1

c.

4

d.

3

Discuss
Answer: (b).1
Q13.
In a gas turbine recuperator, the expression for effectiveness for the parallel flow configuration reduces to

a.

1 – exponential (- NTU)/3

b.

1 – exponential (- NTU)/4

c.

1 – exponential (- 2 NTU)/2

d.

1 – exponential (- NTU)/6

Discuss
Answer: (c).1 – exponential (- 2 NTU)/2
Q14.
What is the maximum efficiency for parallel flow heat exchanger?

a.

5%

b.

10%

c.

20%

d.

50%

Discuss
Answer: (a).5%
Q15.
The curve of effectiveness versus NTU parameters indicates the relationship between

(i) Effectivenes
(ii) NTU MAX
(iii) C MIN/C MAX

Identify the correct statements

a.

1 and 2

b.

1, 2 and 3

c.

2 only

d.

3 only

Discuss
Answer: (b).1, 2 and 3
Q16.
Hot water having specific heat 4200 J/kg K flows through a heat exchanger at the rate of 4 kg/min with an inlet temperature of 100 degree Celsius. A cold fluid having a specific heat 2400 J/kg K flows in at a rate of 8 kg/min and with inlet temperature 20 degree Celsius. Make calculations for maximum possible effectiveness if the fluid flow conforms to parallel flow arrangement

a.

0.533

b.

0.633

c.

0.733

d.

1

Discuss
Answer: (a).0.533
Q17.
A counter flow heat exchanger is used to col 2000 kg/hr of oil (c p = 2.5 k J/kg K) from 105 degree Celsius to 30 degree Celsius by the use of water entering at 15 degree Celsius. If the overall heat transfer coefficient is expected to be 1.5 k W/m² K, find out the water flow rate. Presume that the exit temperature of the water is not to exceed 80 degree Celsius

a.

1680.2 kg/hr

b.

1580.2 kg/hr

c.

1480.2 kg/hr

d.

1380.2 kg/hr

Discuss
Answer: (d).1380.2 kg/hr
Q18.
Assumptions made for calculation of logarithmic mean temperature difference are

(i) Constant overall heat transfer coefficient
(ii) The kinetic and potential energy changes are negligible
(iii) There is no conduction of heat along the tubes of heat exchanger

Identify the correct statements

a.

1, 2 and 3

b.

1 and 3

c.

1 and 2

d.

2 and 3

Discuss
Answer: (a).1, 2 and 3
Q19.
A cold fluid (specific heat 2.95 k J/kg K) at 10 kg/min is to be heated from 25 degree Celsius to 55 degree Celsius in a heat exchanger. The task is accomplished by extracting heat from hot water (specific heat 4.186 k J /kg K) available at mass flow rate 5 kg/min and inlet temperature 85 degree Celsius. Identify the type of arrangement of the heat exchanger

a.

Concentric tubes

b.

Parallel flow

c.

Counter flow

d.

Shell and tubes

Discuss
Answer: (c).Counter flow
Q20.
In a food processing plant, a brine solution is heated from – 12 degree Celsius to – 65 degree Celsius in a double pipe parallel flow heat exchanger by water entering at 35 degree Celsius and leaving at 20.5 degree Celsius. Let the rate of flow is 9 kg/min. Estimate the area of heat exchanger for an overall heat transfer coefficient of 860 W/m² K. For water c P = 4.186 * 10³ J/kg K

a.

1. 293 m²

b.

0.293 m²

c.

7. 293 m²

d.

8. 293 m²

Discuss
Answer: (b).0.293 m²
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