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 32 of 53

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Q311.
For a laminar flow of fluid in a circular tube, 'h1' is the convective heat transfer co-efficient at velocity 'V1'. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is

a.

1.26 h1

b.

0.794 h1

c.

0.574 h1

d.

1.741 h1

Discuss
Answer: (b).0.794 h1
Q312.
The main purpose of providing fins on heat transfer surface is to increase the

a.

temperature gradient.

b.

mechanical strength of the equipment.

c.

heat transfer area.

d.

heat transfer co-efficient.

Discuss
Answer: (c).heat transfer area.
Q313.
A BTU/hr.ft.² °F is equal to

a.

1 kcal/hr. m²°C.

b.

4.88 kcal/hr. m².°C.

c.

1 kcal/hr. m².°K.

d.

none of these.

Discuss
Answer: (b).4.88 kcal/hr. m².°C.
Q314.
Which of the following has the lowest Prandtl number ?

a.

Molten sodium (a coolant used in fast breeder reactor)

b.

Water

c.

Transformer oil

d.

Dilute H₂SO₄

Discuss
Answer: (a).Molten sodium (a coolant used in fast breeder reactor)
Q315.
Choose the most important factor on which the heat conducted through a wall in a unit time will depend on ?

a.

Thickness of the wall.

b.

Area of the wall perpendicular to heat flow.

c.

Material of the wall.

d.

Temperature difference between the two surfaces of the wall.

Discuss
Answer: (d).Temperature difference between the two surfaces of the wall.
Q316.
Which of the following has the minimum thermal conductivity ?

a.

Nitrogen

b.

Steel

c.

Carbon black

d.

Tar

Discuss
Answer: (a).Nitrogen
Q317.
In a heat exchanger, one transfer unit means

a.

a section of the exchanger in which change in temperature of one stream equals the average driving force in the section.

b.

the size of the exchanger in which heat transfer rate is 1 kcal/hr.

c.

both (a) and (b)

d.

none of these

Discuss
Answer: (a).a section of the exchanger in which change in temperature of one stream equals the average driving force in the section.
Q318.
For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then

a.

hf = hd

b.

hf > hd

c.

hf < hd

d.

hf could be greater or smaller than hd

Discuss
Answer: (c).hf < hd
Q319.
Pick out the wrong statement:

a.

The capacity of an evaporator is reduced by the boiling point elevation.

b.

Corrosive liquid is normally passed through the tubes in a shell and tube heat exchanger.

c.

Steam jet ejector is used for vapor compression in a thermal recompression evaporator.

d.

Heat sensitive materials should be concentrated in high pressure evaporators.

Discuss
Answer: (d).Heat sensitive materials should be concentrated in high pressure evaporators.
Q320.
The advantage of backward feed multiple effect evaporators over forward feed units is that

a.

heat sensitive material can be handled.

b.

there is no additional cost of pumping.

c.

most concentrated liquid is at highest temperature.

d.

equal heat transfer co-efficients exist in various effects.

Discuss
Answer: (c).most concentrated liquid is at highest temperature.
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