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!

So, are you ready to put your Heat Transfer Basics knowledge to the test? Let's get started with our carefully curated MCQs!

Heat Transfer Basics MCQs | Page 18 of 53

Discover more Topics under Basic Chemical Engineering

Q171.
Boiling of milk in an open vessel is an example of __________ boiling.

a.

film

b.

sub-cooled

c.

saturated nucleate

d.

none of these

Discuss
Answer: (a).film
Q172.
Pick out the wrong statement.

a.

In process heat exchangers, saturated steam is preferred over the superheated steam.

b.

The maximum is the emissive power of a surface at a temperature T1 occurs at a wavelength of Ξ»1. If the surface temperature is halved, the maximum in the emissive power would occur at a wavelength of 0.5 Ξ»1.

c.

When a vertical plate is heated in infinite air environmental under natural convection conditions, the velocity profile in air, normal to the plate, exhibits a maximum.

d.

A body at 925 K emits an energy of 1.42 x 10¹¹ΟƒW/m² (Οƒ is the Stefan-Boltzman constant) in the wavelength band between 3 ΞΌm to 4 ΞΌm. The fraction of this energy in the total energy emitted over the entire wavelength range is equal to emissivity.

Discuss
Answer: (b).The maximum is the emissive power of a surface at a temperature T1 occurs at a wavelength of Ξ»1. If the surface temperature is halved, the maximum in the emissive power would occur at a wavelength of 0.5 Ξ»1.
Q173.
The value of Stefan-Boltazman constant in SI unit is

a.

5.6697 x 10⁻⁸W/m².°K⁴

b.

0.1714 x 10⁻⁸W/m².°K⁴

c.

5.6697 x 10⁻⁸kcal/m² . °K⁴

d.

0.1714 x 10⁻⁸kcal/m². °K⁴

Discuss
Answer: (a).5.6697 x 10⁻⁸W/m².°K⁴
Q174.
The unit of heat transfer co-efficient is

a.

BTU/hr. ft²°F

b.

BTU/hr. °F. ft.

c.

BTU/hr. °F

d.

BTU/hr. ft

Discuss
Answer: (a).BTU/hr. ft²°F
Q175.
For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of

a.

1

b.

1.74

c.

6.1

d.

37

Discuss
Answer: (c).6.1
Q176.
The inner wall of a furnace is at a temperature of 700°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m⁻¹.°C⁻¹ respectively. The ambient air is at 30°C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m⁻².°C⁻¹. The rate of heat loss from the outer surface in W.m⁻² is

a.

165.4

b.

167.5

c.

172.5

d.

175

Discuss
Answer: (a).165.4
Q177.
Value of Nusselt number [Nu = (hD/k)] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is

a.

0.5

b.

2

c.

10

d.

100

Discuss
Answer: (b).2
Q178.
Pick out the wrong statement.

a.

'Solvates' are chemical compounds formed by solute with their solvents. When water is the solvent, then it is called a 'hydrate'.

b.

In heat exchanger calculations (Ξ”t)weighted is used in place of Ξ”t, when it involves more than one sequence of heating or cooling i.e., desuperheating & condensation or condensation & sub-cooling.

c.

Heat transfer co-efficient during nucleate boiling is not influenced by the agitation imparted.

d.

In case of short tube vertical evaporators, area of central downtake is about 50 to 100% of the total tube cross-sectional area.

Discuss
Answer: (c).Heat transfer co-efficient during nucleate boiling is not influenced by the agitation imparted.
Q179.
Evaporation by thermocompression results in the

a.

saving of steam.

b.

realisation of multiple effect economy in a single effect.

c.

both (a) and (b).

d.

none of these.

Discuss
Answer: (c).both (a) and (b).
Q180.
Forced circulation evaporators are normally used for concentrating liquids having

a.

scaling characteristics

b.

high viscosity

c.

both(a) & (b)

d.

neither (a) nor (b)

Discuss
Answer: (c).both(a) & (b)
Page 18 of 53