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 4 of 8

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Q31.
Heat dissipation by every segment of the fin is

a.

Sometimes same

b.

Same

c.

Not same

d.

Sometimes same or sometimes not same

Discuss
Answer: (c).Not same
Q32.
β€œIf a fin of a constant cross section is used, there would be wastage of material”. Chose the correct option.

a.

True

b.

False

c.

May be

d.

Can't say

Discuss
Answer: (a).True
Q33.
Which one is true regarding parabolic fin?

a.

It dissipates the minimum amount of heat at minimum material cost

b.

It dissipates the minimum amount of heat at maximum material cost

c.

It dissipates the maximum amount of heat at maximum material cost

d.

It dissipates the maximum amount of heat at minimum material cost

Discuss
Answer: (d).It dissipates the maximum amount of heat at minimum material cost
Q34.
For parabolic fin, the curve follows which law?

a.

y = C/x^2

b.

y = C x^4

c.

y = C x^2

d.

y = C x^(1/2)

Discuss
Answer: (c).y = C x^2
Q35.
The correction length for cylindrical fin is
(Where, d is the diameter)

a.

L C = L + d/4

b.

L C = 2 L + d/4

c.

L C = 3 L + d/4

d.

L C = 4 L + d/4

Discuss
Answer: (a).L C = L + d/4
Q36.
A copper steel rod (k = 55 W/m degree) has been attached to a plane wall which is maintained at a temperature of 350 degree Celsius. The rod is 8 cm long and has the cross-section of an equilateral triangle with each side 5 mm. Determine the heat dissipation from the rod if it is exposed to a convection environment at 25 degree Celsius with unit surface conductance 100 W/m² degree. Consider end surface loss to be negligible

a.

10.26 W

b.

9.26 W

c.

8.26 W

d.

7.26 W

Discuss
Answer: (b).9.26 W
Q37.
For an infinitely long fin, the efficiency of fin is given by

a.

1/ml

b.

2/ml

c.

3/ml

d.

4/ml

Discuss
Answer: (a).1/ml
Q38.
For a fin of finite length with an insulated end, the fin efficiency is given as

a.

tan h (ml)

b.

tan (ml)/ml

c.

tan h (m)/ml

d.

tan h (ml)/ml

Discuss
Answer: (d).tan h (ml)/ml
Q39.
For an infinitely long fin, the effectiveness of fin is given as

a.

(P k/h AC)

b.

(P k/h AC)^3/2

c.

(P k/h AC)^1/2

d.

(P k/h AC)^2

Discuss
Answer: (c).(P k/h AC)^1/2
Q40.
For a straight rectangular fin of thickness Ξ΄ and width b, choose the correct option

a.

P/A C = 1/ Ξ΄

b.

P/A C = 2/ Ξ΄

c.

P/A C = 3/ Ξ΄

d.

P/A C = 4/ Ξ΄

Discuss
Answer: (b).P/A C = 2/ Ξ΄
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