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 8 of 53

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Q71.
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
Q72.
For an ideal black body

a.

absorptivity = 1

b.

reflectivity = 1

c.

emissivity = 0

d.

transmissivity = 1

Discuss
Answer: (a).absorptivity = 1
Q73.
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 ms⁻². 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
Q74.
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.
Q75.
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.
Q76.
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.
Q77.
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
Q78.
With increase in temperature, the thermal conductivity of most liquids

a.

increases

b.

decreases

c.

remains same

d.

first increases upto a certain temperature and then becomes constant

Discuss
Answer: (b).decreases
Q79.
What is the unit of thermal conductivity ?

a.

Kcal/hr. m² °C

b.

Kcal/hr.m.°C

c.

Kcal/hr.m

d.

Kcal/hr. °C

Discuss
Answer: (b).Kcal/hr.m.°C
Q80.
The thermal radiation emitted by a body is proportional to Tⁿ, where T is its absolute temperature. The value of 'n' is exactly 4 for

a.

black painted bodies only

b.

all bodies

c.

polished bodies only

d.

a black body

Discuss
Answer: (b).all bodies
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