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.
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
Q42.
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).
Q43.
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% NaNO₂and 7% NaNO₃)

Discuss
Answer: (b).mercury
Q44.
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.
Q45.
The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )

a.

(ΔT)²

b.

√ΔT

c.

(ΔT)^1/4

d.

(ΔT)^3/2

Discuss
Answer: (c).(ΔT)^1/4
Q46.
Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is

a.

in the central core of the fluid.

b.

uniformly distributed throughout the fluid.

c.

mainly confined to a thin film of fluid near the surface.

d.

none of these.

Discuss
Answer: (c).mainly confined to a thin film of fluid near the surface.
Q47.
Which of the following is concerned with both heat and mass transfer ?

a.

Lewis relationship

b.

Nusselt number

c.

Kutateladze number

d.

Froude number

Discuss
Answer: (a).Lewis relationship
Q48.
A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

a.

higher economy

b.

lower capacity

c.

both (a) & (b)

d.

lower economy

Discuss
Answer: (a).higher economy
Q49.
A 10 cm diameter steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m².°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be

a.

greater than that for uninsulated steam pipe.

b.

less than that of the uninsulated steam pipe.

c.

equal to that of the uninsulated steam pipe.

d.

less than the steam pipe with 5 cms insulation.

Discuss
Answer: (b).less than that of the uninsulated steam pipe.
Q50.
Fouling factor

a.

is a dimensionless quantity.

b.

does not provide a safety factor for design.

c.

accounts for additional resistances to heat flow.

d.

none of these.

Discuss
Answer: (c).accounts for additional resistances to heat flow.
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