Heat Transfer Basics MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Heat Transfer Basics, a fundamental topic in the field of Basic Chemical Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Heat Transfer Basics 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 Transfer Basics mcq questions that explore various aspects of Heat Transfer Basics problems. Each MCQ is crafted to challenge your understanding of Heat Transfer Basics principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Basic Chemical Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Heat Transfer Basics MCQs are your pathway to success in mastering this essential Basic Chemical Engineering topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Heat Transfer Basics. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

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Heat Transfer Basics MCQs | Page 23 of 53

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Q221.
For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of

a.

1

b.

1.74

c.

6.1

d.

37

Discuss
Answer: (c).6.1
Q222.
The inner wall of a furnace is at a temperature of 700°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.mโป¹.°Cโป¹ respectively. The ambient air is at 30°C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.mโป².°Cโป¹. The rate of heat loss from the outer surface in W.mโป² is

a.

165.4

b.

167.5

c.

172.5

d.

175

Discuss
Answer: (a).165.4
Q223.
Value of Nusselt number [Nu = (hD/k)] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is

a.

0.5

b.

2

c.

10

d.

100

Discuss
Answer: (b).2
Q224.
Pick out the wrong statement.

a.

'Solvates' are chemical compounds formed by solute with their solvents. When water is the solvent, then it is called a 'hydrate'.

b.

In heat exchanger calculations (ฮ”t)weighted is used in place of ฮ”t, when it involves more than one sequence of heating or cooling i.e., desuperheating & condensation or condensation & sub-cooling.

c.

Heat transfer co-efficient during nucleate boiling is not influenced by the agitation imparted.

d.

In case of short tube vertical evaporators, area of central downtake is about 50 to 100% of the total tube cross-sectional area.

Discuss
Answer: (c).Heat transfer co-efficient during nucleate boiling is not influenced by the agitation imparted.
Q225.
Evaporation by thermocompression results in the

a.

saving of steam.

b.

realisation of multiple effect economy in a single effect.

c.

both (a) and (b).

d.

none of these.

Discuss
Answer: (c).both (a) and (b).
Q226.
Forced circulation evaporators are normally used for concentrating liquids having

a.

scaling characteristics

b.

high viscosity

c.

both(a) & (b)

d.

neither (a) nor (b)

Discuss
Answer: (c).both(a) & (b)
Q227.
Steam economy in case of a triple effect evaporator will be

a.

1

b.

< 1

c.

> 1

d.

between 0 and 1

Discuss
Answer: (c).> 1
Q228.
In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be

a.

less than 45°C

b.

more than 45°C

c.

equal to 45°C

d.

initially decreases and remains constant thereafter.

Discuss
Answer: (b).more than 45°C
Q229.
Multiple effect evaporation accounts for

a.

steam economy

b.

lower operating costs

c.

investment economy

d.

none of these

Discuss
Answer: (a).steam economy
Q230.
In case of a supercooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is

a.

more

b.

less

c.

same

d.

more or less; depends on the nature of solution

Discuss
Answer: (a).more
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