Heat Transfer From Extended Surfaces MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Heat Transfer From Extended Surfaces, a fundamental topic in the field of Heat Transfer. 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 From Extended Surfaces 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 From Extended Surfaces mcq questions that explore various aspects of Heat Transfer From Extended Surfaces problems. Each MCQ is crafted to challenge your understanding of Heat Transfer From Extended Surfaces principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Heat Transfer tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Heat Transfer From Extended Surfaces MCQs are your pathway to success in mastering this essential Heat Transfer topic.

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Heat Transfer From Extended Surfaces MCQs | Page 1 of 8

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Q1.
A very long copper rod 20 mm in diameter extends horizontally from a plane heated wall maintained at 100 degree Celsius. The surface of the rod is exposed to an air environment at 20 degree Celsius with convective heat transfer coefficient of 8.5 W/m² degree. Workout the heat loss if the thermal conductivity of copper is 400 W/m degree

a.

10.71 W

b.

20.71 W

c.

30.71 W

d.

40.71 W

Discuss
Answer: (b).20.71 W
Q2.
Common applications of finned surfaces are with

(i) Electrical motors

(ii) Economizers for steam power plant

(iii) Convectors for steam and cold water heating systems

(iv) Cooling coils

Identify the correct option

a.

1, 2 and 4

b.

1, 2 and 3

c.

1, 2, 3 and 4

d.

1 and 2

Discuss
Answer: (a).1, 2 and 4
Q3.
The extended surface used for the enhancement of heat dissipation is

a.

Convective coefficient

b.

Fourier number

c.

Fin

d.

No finned surface

Discuss
Answer: (c).Fin
Q4.
It is said that fins can take a variety of forms

(i) Longitudinal fins of rectangular cross section attached to a wall

(ii) Cylindrical tubes with radial fins

(iii) Conical rod protruding from a wall

Identify the correct statement

a.

1 only

b.

1 and 2

c.

2 and 3

d.

1, 2 and 3

Discuss
Answer: (d).1, 2 and 3
Q5.
A steel rod (k = 30 W/m degree) 1 cm in diameter and 5 cm long protrudes from a wall which is maintained at 10 degree Celsius. The rod is insulated at its tip and is exposed to an environment with h = 50 W/m² degree and t a = 30 degree Celsius. Calculate the fin efficiency

a.

56.57%

b.

66.57%

c.

76.57%

d.

86.57%

Discuss
Answer: (b).66.57%
Q6.
If fin is sufficiently thin, so heat flows pertains to

a.

One dimensional heat conduction

b.

Two dimensional heat conduction

c.

Three dimensional heat conduction

d.

No heat flow is there

Discuss
Answer: (a).One dimensional heat conduction
Q7.
If heat dissipation for one fin is given by 377.45 k J/hour, then what is the heat dissipation for 12 fins?

a.

7529.4 k J/hour

b.

6529.4 k J/hour

c.

5529.4 k J/hour

d.

4529.4 k J/hour

Discuss
Answer: (d).4529.4 k J/hour
Q8.
In order to achieve maximum heat dissipation the fin should be designed in such a way that has a

a.

Maximum lateral surface towards the tip side of fin

b.

Minimum lateral surface near the center line

c.

Maximum lateral surface at the root side of fin

d.

Maximum lateral surface near the center of fin

Discuss
Answer: (c).Maximum lateral surface at the root side of fin
Q9.
A steel rod (k = 30 W/m degree) 1 cm in diameter and 5 cm long protrudes from a wall which is maintained at 10 degree Celsius. The rod is insulated at its tip and is exposed to an environment with h = 50 W/m² degree and t a = 30 degree Celsius. Calculate the rate of heat dissipation

a.

2.658 W

b.

3.658 W

c.

4.658 W

d.

5.658 W

Discuss
Answer: (b).3.658 W
Q10.
On a heat transfer surface, fins are provided to

a.

Increase turbulence in flow for enhancing heat transfer

b.

Increase temperature gradient so as to enhance heat transfer

c.

Pressure drop of the fluid should be minimized

d.

Surface area is maximum to promote the rate of heat transfer

Discuss
Answer: (d).Surface area is maximum to promote the rate of heat transfer
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