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 3 of 8

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Q21.
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
Q22.
A rod of 10 mm square section and 160 mm length with thermal conductivity of 50W/m K protrudes from a furnace wall at 200 degree Celsius with convective coefficient 20 W/ square m K. Make calculations for the heat convective up to 80 mm length

a.

6.84W

b.

7.34W

c.

4.54W

d.

5.47W

Discuss
Answer: (a).6.84W
Q23.
A fin protrudes from a surface which is held at a temperature higher than that of its environment. The heat transferred away from the fin is

a.

Heat escaping from the tip of the fin

b.

Heat conducted along the fin length

c.

Convective heat transfer from the fin surface

d.

Sum of heat conducted along the fin length and that convected from the surface

Discuss
Answer: (c).Convective heat transfer from the fin surface
Q24.
The value of correction length for equilateral fin is

a.

L C = 2 L + a/4(3)^1/2

b.

L C = L + a/4(3)^1/2

c.

L C = 3 L + a/4(3)^1/2

d.

L C = 6 L + a/4(3)^1/2

Discuss
Answer: (b).L C = L + a/4(3)^1/2
Q25.
The parameter m = (h P/k A C)^1/2 has been stated to increase in a long fin. If all other parameters are constant, then

a.

Profile of temperature will remain the same

b.

Along the length temperature drop will be less

c.

The parameter influences the heat flow only

d.

The temperature drop along the length will be steeper

Discuss
Answer: (d).The temperature drop along the length will be steeper
Q26.
The relevant boundary conditions in case of heat dissipation from a fin insulated at the tip are

a.

t = t₀ at x = 0 and d t/d x = 0 at x = 0

b.

t = t₀ at x = 0 and d t/d x = 0 at x = 1

c.

t = t₀ at x = 1 and d t/d x = 0 at x = 1

d.

t = t₀ at x = infinity and d t/d x = 0 at x = infinity

Discuss
Answer: (b).t = t₀ at x = 0 and d t/d x = 0 at x = 1
Q27.
The temperature distribution in case of fin insulated at the tip is given by

a.

t – t₀/t₀ – t a = cos h m (3 – x)/cos ml

b.

t – t₀/t₀ – t a = cos h m (2 – x)/sin h ml

c.

t – t₀/t₀ – t a = cos h m (l – x)/cos h ml

d.

t – t₀/t₀ – t a = cos m (l – x)/sin ml

Discuss
Answer: (c).t – t₀/t₀ – t a = cos h m (l – x)/cos h ml
Q28.
The rate of heat transfer from the fin in case of fin insulated at the tip is

a.

(h P k A)^1/2 (t₀ – t a) tan h ml

b.

(h k A)^1/2 (t₀ – t a) tan h ml

c.

(h P A)^1/2 (t₀ – t a) tan h ml

d.

(h P k)^1/2 (t₀ – t a) tan h ml

Discuss
Answer: (a).(h P k A)^1/2 (t₀ – t a) tan h ml
Q29.
“Fin is insulated at the tip”. What does that mean?

a.

Less heat is transferred from the tip

b.

Heat will transferred from tip only

c.

More heat is transferred from the tip

d.

No heat is transferred from the tip

Discuss
Answer: (d).No heat is transferred from the tip
Q30.
Find the heat transfer rate from a hot surface for 6 fins of 10 cm length? The base temperature of the fin is maintained at 200 degree Celsius and the film is exposed to a convection environment at 15 degree Celsius with convective coefficient 25W/square m K. Each fin has cross-sectional area 2.5 square centimeter and is made of a material having thermal conductivity 250W/m K

a.

120.34W

b.

130.18W

c.

145.46W

d.

165.43W

Discuss
Answer: (b).130.18W
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