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 52 of 53

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Q511.
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
Q512.
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.
Q513.
Heat transfer co-efficient equation for forced convection, Nu = 0.023 Re^0.8 . Prⁿ, is not valid, if the value of

a.

n = 0.4 is used for heating.

b.

n = 0.3 is used for cooling.

c.

Reynolds number for the flow involved is > 10000.

d.

Reynolds number for the flow involved is < 2100.

Discuss
Answer: (d).Reynolds number for the flow involved is < 2100.
Q514.
Which is the best tube arrangement (in a shell and tube heat exchanger) if the fluids are clean and non-fouling ?

a.

Square pitch

b.

Triangular pitch

c.

Diagonal square pitch

d.

None of these

Discuss
Answer: (b).Triangular pitch
Q515.
In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid

a.

is inversely proportional to the resistance across which the drop occurs.

b.

and the wall are proportional to individual resistances.

c.

and the wall is not related.

d.

none of these.

Discuss
Answer: (b).and the wall are proportional to individual resistances.
Q516.
Reason for operating an evaporator in multiple effect is to secure

a.

increased steam economy.

b.

decreased steam consumption.

c.

both (a) and (b).

d.

increased capacity.

Discuss
Answer: (c).both (a) and (b).
Q517.
In a cooling tower, water becomes cool by

a.

loosing sensible heat.

b.

heat transfer to surroundings.

c.

vaporisation due to heat loss to air.

d.

loosing latent heat.

Discuss
Answer: (a).loosing sensible heat.
Q518.
In Fourier's law, the proportionality constant is called the

a.

heat transfer co-efficient

b.

thermal diffusivity

c.

thermal conductivity

d.

Stefan-Boltzman constant

Discuss
Answer: (c).thermal conductivity
Q519.
The heat transfer co-efficient in film type condensation is __________ that for dropwise condensation.

a.

greater than

b.

lower than

c.

is same as

d.

half

Discuss
Answer: (b).lower than
Q520.
Pick out the wrong statement.

a.

Bubble size increases with the dynamic viscosity of the liquid in case of nucleate pool boiling.

b.

Thermal conductivity of a dry material is more than that of the damp material.

c.

Ratio of its capacity to economy equals the steam consumption in kg/hr in an evaporator.

d.

Vaporisation of organic substances in evaporator mostly causes foam formation.

Discuss
Answer: (b).Thermal conductivity of a dry material is more than that of the damp material.
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