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.

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Heat Transfer Basics MCQs | Page 22 of 53

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Q211.
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.
Q212.
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).
Q213.
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)
Q214.
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
Q215.
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
Q216.
Multiple effect evaporation accounts for

a.

steam economy

b.

lower operating costs

c.

investment economy

d.

none of these

Discuss
Answer: (a).steam economy
Q217.
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
Q218.
Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.

a.

1

b.

10

c.

20

d.

30

Discuss
Answer: (a).1
Q219.
In Biot number, the characteristic length used is the ratio of the __________ of the solid.

a.

volume to surface area

b.

perimeter to surface area

c.

surface area to volume

d.

surface area to perimeter

Discuss
Answer: (a).volume to surface area
Q220.
Which of the following is the most widely used heat insulating material for pipelines carrying steam ?

a.

Tar dolomite bricks followed by asbestos.

b.

Fireclay refractory followed by aluminium sheet.

c.

Cotton followed by aluminium foil.

d.

85% magnesia cement and glass wool.

Discuss
Answer: (d).85% magnesia cement and glass wool.
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