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.
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
Q22.
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
Q23.
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
Q24.
Which one is true for the spine?

a.

A C = ฯ€ d²/4 and P = 4 ฯ€ d

b.

A C = ฯ€ d²/4 and P = 3 ฯ€ d

c.

A C = ฯ€ d²/4 and P = ฯ€ d

d.

A C = ฯ€ d²/4 and P = 2 ฯ€ d

Discuss
Answer: (c).A C = ฯ€ d²/4 and P = ฯ€ d
Q25.
In convection from the tip what is the value of correction length?

a.

L C = A C/P

b.

L C = L + A C

c.

L C = L + P

d.

L C = L + A C/P

Discuss
Answer: (d).L C = L + A C/P
Q26.
Let us assume there are two pieces of copper wire 0.1625 cm in diameter with a device that melts it at 195 degree Celsius. The wires are positioned vertically in air at 24 degree Celsius and the heat transfer coefficient of the wire is 17 W/ square m K. Let us say k = 335W/m K i.e. of wire. Find out the energy input?

a.

1.234W

b.

2.652W

c.

4.562W

d.

9.435W

Discuss
Answer: (b).2.652W
Q27.
The figure shows a 5 cm diameter rod, 90 cm long, which is having its lower face grinded smooth. The remainder of the rod is exposed to 32 degree Celsius room air and a surface coefficient heat transfer equal to 6.8 W/m² degree exists between the rod surface and the room air. The grinder dissipates mechanical energy at the rate of 35 W. If thermal conductivity of rod material is 41.5 W/m degree, find the temperature of the rod at the point where the grinding is taking place

a.

161.45 degree celsius

b.

151.45 degree celsius

c.

141.45 degree celsius

d.

131.45 degree celsius

Discuss
Answer: (b).151.45 degree celsius
Q28.
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
Q29.
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
Q30.
In heat dissipation from an infinitely long fin, the boundary conditions are

a.

t = t0 at x = infinity and t = ta at x = 0

b.

t = t0 at x = 0 and t = ta at x = infinity

c.

t = t0 at x = 0 and t = ta at x = 0

d.

t = t0 at x = infinity and t = ta at x = infinity

Discuss
Answer: (b).t = t0 at x = 0 and t = ta at x = infinity
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