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 10 of 53

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Q91.
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.
Q92.
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.
Q93.
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
Q94.
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
Q95.
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
Q96.
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
Q97.
It is not preferable to use superheated steam in evaporators, because of its very

a.

high temperature

b.

high pressure

c.

low film co-efficient

d.

none of these

Discuss
Answer: (c).low film co-efficient
Q98.
It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is

a.

3.06 x 10⁵

b.

6.12 x 10⁵

c.

7.24 x 10⁵

d.

9.08 x 10⁵

Discuss
Answer: (a).3.06 x 10⁵
Q99.
LMTD for counterflow and prallel flow heat exchanger will be the same, when the

a.

cold fluid is heated to a certain temperature by condensing steam (isothermal fluid).

b.

outlent temperature of both the hot and cold fluid are same.

c.

outlet temperature of hot fluid is less than the outlet temperature of the cold fluid.

d.

none of these.

Discuss
Answer: (a).cold fluid is heated to a certain temperature by condensing steam (isothermal fluid).
Q100.
For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it

a.

occupies smaller space.

b.

is more economical.

c.

is easy to operate and maintain.

d.

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

Discuss
Answer: (d).all (a), (b) and (c).
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