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 24 of 53

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Q231.
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ law.

a.

hyperbolic

b.

parabolic

c.

linear

d.

logarithmic

Discuss
Answer: (c).linear
Q232.
In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred

a.

through a metallic wall.

b.

by direct contact of hot flue gas with air.

c.

by heating an intermediate material (like chequor bricks) and then heating the air from this hot material.

d.

none of these.

Discuss
Answer: (c).by heating an intermediate material (like chequor bricks) and then heating the air from this hot material.
Q233.
__________ equation relates the thermal conductivity of a solid to its temperature.

a.

Antonie

b.

Kopp's

c.

Lee's

d.

Kistyakowski

Discuss
Answer: (c).Lee's
Q234.
For small temperature difference, the heat transfer rate as per Newton's law of cooling is proportional to (where, Δt = excess temperature)

a.

Δt

b.

Δt²

c.

Δt³

d.

√Δt

Discuss
Answer: (a).Δt
Q235.
Pick out the wrong statement.

a.

The condensing film co-efficient is about 3 times lower for vertical condenser as compared to the equivalent horizontal condenser for identical situation.

b.

Film co-efficient for vaporisation decreases as a result of vapor binding.

c.

In industrial practice, sub-cooling of condensate is required, when the condensate is a volatile liquid and is to be transferred for storage.

d.

Overall heat transfer co-efficient in a heat exchanger is controlled by the value of the film co-efficient, which is higher.

Discuss
Answer: (d).Overall heat transfer co-efficient in a heat exchanger is controlled by the value of the film co-efficient, which is higher.
Q236.
In case of __________ boiling, the bubbles formed on a submerged hot surface get absorbed in the mass of the liquid.

a.

nucleate

b.

pool

c.

low pressure

d.

none of these

Discuss
Answer: (b).pool
Q237.
A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.

a.

10

b.

>10

c.

<10

d.

either (b) or (c), depends on the mass of the body

Discuss
Answer: (b).>10
Q238.
In forced convection, the Nusselt number is a function of

a.

Re and Pr

b.

Re and Gr

c.

Pr and Gr

d.

Re and Sc

Discuss
Answer: (a).Re and Pr
Q239.
At what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical ?

a.

0.5

b.

1

c.

1.5

d.

80

Discuss
Answer: (b).1
Q240.
A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because

a.

total heat transfer area of all the effects is -less than that in a single effect evaporator system.

b.

total amount of vapor produced per Kg of feed steam in a multiple effect system is much higher than in a single effect.

c.

boiling point elevation in a single effect system is much higher than that in any effect in a multieffect system.

d.

heat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect system.

Discuss
Answer: (b).total amount of vapor produced per Kg of feed steam in a multiple effect system is much higher than in a single effect.
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