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.
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
Q32.
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
Q33.
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
Q34.
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΄
Q35.
β€œEffectiveness of fin is the ratio of the fin heat dissipation with fin to that of no fin”. Choose the correct answer

a.

True

b.

False

c.

May be

d.

Can't say

Discuss
Answer: (a).True
Q36.
Three fins of equal length and diameter but made of aluminum, brass and cast iron is heated to 200 degree Celsius at one end. If the fins dissipate heat to the surrounding air at 25 degree Celsius, the temperature at the free end will be least in

a.

1/ml

b.

2/ml

c.

Aluminum fin

d.

4/ml

Discuss
Answer: (c).Aluminum fin
Q37.
Two long rods A and B of the same diameter have thermal conductivities k and 4k and have one of their end inserted into a furnace at 400 K. At 9.5 m away section from the furnace, the temperature of rod B is120 degree Celsius. So find out at what end from the furnace end, the same temperature would be reached in the rod A?

a.

0.25 m

b.

0.75 m

c.

0.15 m

d.

0.50 m

Discuss
Answer: (a).0.25 m
Q38.
The following factors need consideration for the optimum design of fins

(i) Cost

(ii) Space considerations

(iii) Weight considerations

Choose the correct option

a.

1 only

b.

1 and 2 only

c.

1, 2 and 3

d.

2 only

Discuss
Answer: (c).1, 2 and 3
Q39.
A heating unit is made in the form of a vertical tube of 50 mm outside diameter and 1.2 m height. The tube is fitted with 20 steel fins of rectangular section with height 40 mm and thickness 2.5 mm. The temperature at the base of fin is 75 degree Celsius, the surrounding air temperature is 20 degree Celsius and the heat transfer coefficient between the fin as well as the tube surface and the surrounding air is 9.5 W/m² K. If thermal conductivity of the fin material is 55 W/m K, find the amount of heat transferred from the tube with fin

a.

1234 .98 W

b.

1004.84 W

c.

6539.83 W

d.

3829.46 W

Discuss
Answer: (b).1004.84 W
Q40.
The fins would be effective for heat conduction if the ratio P k/h A C is

a.

Greater than 5

b.

Less than 5

c.

Equal to 5

d.

Varies between 2 to 9

Discuss
Answer: (a).Greater than 5
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