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 34 of 53

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Q331.
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.
Q332.
Which of the following has the minimum thermal conductivity ?

a.

Nitrogen

b.

Steel

c.

Carbon black

d.

Tar

Discuss
Answer: (a).Nitrogen
Q333.
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.
Q334.
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
Q335.
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.
Q336.
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.
Q337.
Which of the following is the most controlling factor for the rate of bubble detachment from the hot solid surface ?

a.

Liquid density

b.

Liquid viscosity

c.

Hot surface temperature

d.

Interfacial tension

Discuss
Answer: (d).Interfacial tension
Q338.
Which characteristic of a fluid is not important in deciding its route in a shell and tube heat exchanger ?

a.

Corrosiveness

b.

Fouling characteristic

c.

Viscosity

d.

None of these

Discuss
Answer: (d).None of these
Q339.
Thermal conductivities of most of the liquids __________ with rise in temperature.

a.

increases

b.

decreases

c.

remains unchanged

d.

may increase or decrease; depends on the liquid

Discuss
Answer: (b).decreases
Q340.
A metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/m³ and 0.4 kJ/kg.K respectively. The heat transfer co-efficient is 50 W/m².K Neglecting the temperature gradients inside the ball, the time taken (in hours) for the ball to cool to 60°C is

a.

555

b.

55.5

c.

0.55

d.

0.15

Discuss
Answer: (d).0.15
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