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 10 of 53

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Q91.
Pick out the wrong statement.

a.

The controlling resistance in case of heating of air by condensing steam is in the air film.

b.

The log mean temperature difference (LMTD) for counter flow and parallel flow can be theoretically same when any one of the fluids (hot or cold fluid) passes through the heat exchanger at constant temperature.

c.

In case of a 1 - 2 shell and tube heat exchanger, the LMTD correction factor value increases sharply, when a temperature cross occurs.

d.

Phase change in case of a pure fluid at a given pressure from liquid to vapor or vice-versa occurs at saturation temperature.

Discuss
Answer: (c).In case of a 1 - 2 shell and tube heat exchanger, the LMTD correction factor value increases sharply, when a temperature cross occurs.
Q92.
Shell side pressure drop in a shell and tube heat exchanger does not depend upon the

a.

baffle spacing & shell diameter.

b.

tube diameter & pitch.

c.

viscosity, density & mass velocity of shell side fluid.

d.

none of these.

Discuss
Answer: (d).none of these.
Q93.
In the equation Q = UAฮ”t; ฮ”t is

a.

geometric mean temperature difference.

b.

arithmetic mean temperature difference.

c.

logarithmic mean temperature difference.

d.

the difference of average bulk temperatures of hot and cold fluids.

Discuss
Answer: (c).logarithmic mean temperature difference.
Q94.
With increase in porosity, the thermal conductivity of a solid substance

a.

increases

b.

decreases

c.

remains unchanged

d.

may increase or decrease; depends on the solid

Discuss
Answer: (b).decreases
Q95.
For an ideal black body

a.

absorptivity = 1

b.

reflectivity = 1

c.

emissivity = 0

d.

transmissivity = 1

Discuss
Answer: (a).absorptivity = 1
Q96.
In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 msโป². Neglecting the heat capacity of agitator, the temperature of water (in °C) is

a.

40.5

b.

34.4

c.

26.8

d.

25

Discuss
Answer: (b).34.4
Q97.
The Graetz number is concerned with the

a.

mass transfer between a gas and a liquid.

b.

absorption with chemical reaction.

c.

heat transfer in turbulent flow.

d.

heat transfer in laminar flow.

Discuss
Answer: (d).heat transfer in laminar flow.
Q98.
Solid angle subtended by the finite surface at the radiating element is

a.

called the view factor.

b.

called the angle of vision.

c.

proportional to the square of the distance between surfaces.

d.

expressed in terms of radians.

Discuss
Answer: (b).called the angle of vision.
Q99.
Pick out the wrong statement.

a.

The emissivity of a surface decreases, if it gets corroded by atmospheric environment.

b.

The emissivity of a surface increases with increase in surface roughness.

c.

The emissivity of a polished surface is quite low.

d.

The emissivity of a non-metallic surface decreases with increase in the temperature.

Discuss
Answer: (a).The emissivity of a surface decreases, if it gets corroded by atmospheric environment.
Q100.
In forced convection, the heat transfer depends on

a.

Re, Pr

b.

Re, Gr

c.

mainly Gr

d.

Re only

Discuss
Answer: (a).Re, Pr
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