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 5 of 53

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Q41.
The number of kg vaporised per kg of steam fed to the evaporator is defined as

a.

capacity

b.

rate of evaporation

c.

economy

d.

rate of vaporisation

Discuss
Answer: (c).economy
Q42.
Pick out the wrong statement.

a.

In case of heat transfer by purely forced convection, GR/Re² ≀ 1.

b.

The equivalent diameter of heat transfer for a duct of square cross-section (having each side as 'x') is equal to 4x.

c.

Distillation process is not the same as evaporation.

d.

The effectiveness of nucleate boiling depends basically on the ease with which the bubbles are formed and detached from the heating surface.

Discuss
Answer: (b).The equivalent diameter of heat transfer for a duct of square cross-section (having each side as 'x') is equal to 4x.
Q43.
Economy of a multiple effect evaporator is not influenced much by the

a.

boiling point elevations

b.

temperature of the feed

c.

rate of heat transfer

d.

ratio of the weight of the thin liquor to thick liquor

Discuss
Answer: (a).boiling point elevations
Q44.
Increasing the liquor level in the evaporator results in the

a.

decreased capacity.

b.

increase in liquor film co-efficient.

c.

decreased effect of hydrostatic head.

d.

increased true temperature drop.

Discuss
Answer: (a).decreased capacity.
Q45.
Pick out the wrong statement.

a.

Orifice baffles are never used in a shell and tube heat exchanger.

b.

Pressure drop on the shell side of a heat exchanger depends upon tube pitch also.

c.

In a horizontal tube evaporator, surface blanketing by air is avoided.

d.

Split ring type and pull through type floating heads are two commonly used floating heads is heat exchangers.

Discuss
Answer: (a).Orifice baffles are never used in a shell and tube heat exchanger.
Q46.
Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.

a.

laminar

b.

transition

c.

both 'a' & 'b'

d.

highly turbulent

Discuss
Answer: (d).highly turbulent
Q47.
The actual temperature drop across the heating surface in an evaporator depends on the

a.

feed.

b.

depth of liquid over heating surface.

c.

pressure difference between steam chest and vapour space.

d.

all (a), (b) and (c).

Discuss
Answer: (d).all (a), (b) and (c).
Q48.
Which of the following is not used as a medium for high temperature heating ?

a.

Dowtherm

b.

mercury

c.

liquid metal (e.g. molten sodium)

d.

fused salts (e.g., an eutectic mixture of 53% KNO₃, 40% NaNOβ‚‚and 7% NaNO₃)

Discuss
Answer: (b).mercury
Q49.
Presence of a non-condensing gas in a condensing vapour

a.

increases the rate of condensation.

b.

decreases thermal resistance.

c.

is desirable to increase the film co-efficient.

d.

none of these.

Discuss
Answer: (d).none of these.
Q50.
The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, Ξ”T = Temperature drop across condensate film )

a.

(Ξ”T)²

b.

βˆšΞ”T

c.

(Ξ”T)^1/4

d.

(Ξ”T)^3/2

Discuss
Answer: (c).(Ξ”T)^1/4
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