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 7 of 7

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Q61.
In a counter flow heat exchanger, water flowing through a tube of 10 cm inner diameter is heated by steam condensing on the outside of the tube. The convective film coefficient on the water and steam side are estimated to be 12000 and 20000 k J/m² hr degree. Neglecting tube thickness and its resistance to heat flow, workout the overall heat transfer coefficient for the heat exchanger

a.

4500 k J/m² hr degree

b.

5500 k J/m² hr degree

c.

6500 k J/m² hr degree

d.

7500 k J/m² hr degree

Discuss
Answer: (d).7500 k J/m² hr degree
Q62.
A heat exchanger to preheat oil for a furnace was designed without considering the possibility of scale formation, and the overall heat transfer coefficient based on the fuel oil side was 3200 k J/m² hr degree. What would be the corrected coefficient of heat transfer if a fouling factor of 0.00025 m² hr degree/k J for the fuel oil is taken into account?

a.

1777.78 k J/m² hr degree

b.

1666.78 k J/m² hr degree

c.

1555.78 k J/m² hr degree

d.

1444.78 k J/m² hr degree

Discuss
Answer: (a).1777.78 k J/m² hr degree
Q63.
A copper pipe (k = 350 W/m K) having inner diameter of 1.75 cm and 2.0 cm outside diameter conveys water and the oil flows through the annular passage between this pipe and a steel pipe. On the water side, the film coefficient is 4600 W/m² K and the fouling factor is 0.00034 m² K/W. The corresponding values for the oil side are 1200 W/m² K and 0.00086 m² K/W. Estimate the overall heat transfer coefficient between the oil and water

a.

235.16 W/m² K

b.

335.16 W/m² K

c.

435.16 W/m² K

d.

535.16 W/m² K

Discuss
Answer: (c).435.16 W/m² K
Q64.
Unit of fouling factor is

a.

m² K/kcal

b.

m² hr K/kcal

c.

m² hr/kcal

d.

m² hr K

Discuss
Answer: (b).m² hr K/kcal
Q65.
The rear window of an automobile is made of thick glass i.e. AB = 5 mm and thermal conductivity is 0.8 W/m degree. To defrost this window, a thin transparent film type heating element has been fixed to its inner surface. For the conditions given below, determine the electric power that must be provided per unit area of window if a temperature 5 degree Celsius is maintained at its outer surface. Interior air temperature and the corresponding surface coefficient are 20 degree Celsius and 12 W/m² degree. Surrounding air temperature and the corresponding surface coefficient are – 15 degree Celsius and 70 W/m² degree. Electric heater provides uniform heat flux

a.

232.5 /m²

b.

1232.5 /m²

c.

2232.5 /m²

d.

3232.5 /m²

Discuss
Answer: (b).1232.5 /m²
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