Steady State Conduction MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Steady State Conduction, 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 Steady State Conduction 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 Steady State Conduction mcq questions that explore various aspects of Steady State Conduction problems. Each MCQ is crafted to challenge your understanding of Steady State Conduction 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 Steady State Conduction MCQs are your pathway to success in mastering this essential Heat Transfer topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Steady State Conduction. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Steady State Conduction knowledge to the test? Let's get started with our carefully curated MCQs!

Steady State Conduction MCQs | Page 7 of 7

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Q61.
A cable of 10 mm outside is to be laid in an atmosphere of 25 degree Celsius (h = 12.5 W/m² degree) and its surface temperature is likely to be 75 degree Celsius due to heat generated within it. How would the heat flow from the cable be affected if it is insulated with rubber having thermal conductivity k = 0.15 W/m degree?

a.

43.80 W per meter length

b.

53.80 W per meter length

c.

63.80 W per meter length

d.

73.80 W per meter length

Discuss
Answer: (b).53.80 W per meter length
Q62.
Chose the correct one with respect to critical radius of insulation

a.

There is more heat loss i.e. conductive

b.

There occurs a decrease in heat flux

c.

Heat loss increases with addition of insulation

d.

Heat loss decreases with addition of insulation

Discuss
Answer: (c).Heat loss increases with addition of insulation
Q63.
A heat exchanger shell of outside radius 15 cm is to be insulated with glass wool of thermal conductivity 0.0825 W/m degree. The temperature at the surface is 280 degree Celsius and it can be assumed to remain constant after the layer of insulation has been applied to the shell. The convective film coefficient between the outside surface of glass wool and the surrounding air is estimated to be 8 W/m² degree. What is the value of critical radius?

a.

9.31 mm

b.

10.31 mm

c.

11.31 mm

d.

12.31 mm

Discuss
Answer: (b).10.31 mm
Q64.
For an object i.e. spherical the value of critical radius would be

a.

2k/3h

b.

3k/h

c.

2k/h

d.

k/h

Discuss
Answer: (c).2k/h
Q65.
Maximum value of critical radius is

a.

0.01 m

b.

0.04 m

c.

0.06 m

d.

0.0001 m

Discuss
Answer: (a).0.01 m
Q66.
An electric cable of aluminum (k = 240 W/ m degree) is to be insulated with rubber (k = 6 W/ square meter degree). If the cable is in air (h = 6 W/square meter degree). Find the critical radius?

a.

80 mm

b.

160 mm

c.

40 mm

d.

25 mm

Discuss
Answer: (d).25 mm
Q67.
The value of critical radius in case of cylindrical hollow object is

a.

2k/h

b.

2h/k

c.

k/h

d.

h/k

Discuss
Answer: (c).k/h
Q68.
A wire of radius 3 mm and 1.25 m length is to be maintained at 60 degree Celsius by insulating it by a material of thermal conductivity 0.175 W/m K. The temperature of surrounding is 20 degree Celsius with heat transfer coefficient 8.5 W/ m² K. Find percentage increase in heat loss due to insulation?

a.

134.46 %

b.

124.23 %

c.

100.00 %

d.

12.55 %

Discuss
Answer: (a).134.46 %
Q69.
A pipe of outside diameter₂0 mm is to be insulated with asbestos which has a mean thermal conductivity of 0.1 W/m degree. The local coefficient of convective heat to the surroundings is 5 W/square meter degree. Find the critical radius of insulation for optimum heat transfer from pipe?

a.

10 mm

b.

20 mm

c.

30 mm

d.

40 mm

Discuss
Answer: (b).20 mm
Q70.
For insulation to be properly effective in restricting heat transmission, the pipe radius r0 will be

a.

Greater than critical radius

b.

Less than critical radius

c.

Equal to critical radius

d.

Greater than or equal to critical radius

Discuss
Answer: (d).Greater than or equal to critical radius
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