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!

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Steady State Conduction MCQs | Page 1 of 7

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Q1.
Find the heat flow rate through the composite wall as shown in figure. Assume one dimensional flow and take

k 1 = 150 W/m degree
k 2 = 30 W/m degree
k 3 = 65 W/m degree
k 4 = 50 W/m degree
AB = 3 cm, BC = 8 cm and CD = 5 cm.
The distance between middle horizontal line from the top is 3 cm and from the bottom is 7 cm

a.

1173.88 W

b.

1273.88 W

c.

1373.88 W

d.

1473.88 W

Discuss
Answer: (b).1273.88 W
Q2.
A steel pipe of 20 mm inner diameter and 2 mm thickness is covered with 20 mm thick of fiber glass insulation (k = 0.05 W/m degree). If the inside and outside convective coefficients are 10 W/m² degree and 5 W/m² degree, calculate the overall heat transfer coefficient based on inside diameter of pipe. In the diagram, the diameter of small circle is 20 mm

a.

1.789 W/m² degree

b.

2.789 W/m² degree

c.

3.789 W/m² degree

d.

4.789 W/m² degree

Discuss
Answer: (b).2.789 W/m² degree
Q3.
The oven of an electric store, of total outside surface area 2.9 m² dissipates electric energy at the rate of 600 W. The surrounding room air is at 20 degree Celsius and the surface coefficient of heat transfer between the room air and the surface of the oven is estimated to be 11.35 W/m² degree. Determine the average steady state temperature of the outside surface of the store

a.

38.22 degree Celsius

b.

48.22 degree Celsius

c.

58.22 degree Celsius

d.

68.22 degree Celsius

Discuss
Answer: (a).38.22 degree Celsius
Q4.
The accompanying sketch shows the schematic arrangement for measuring the thermal conductivity by the guarded hot plate method. Two similar 1 cm thick specimens receive heat from a 6.5 cm by 6.5 cm guard heater. When the power dissipation by the wattmeter was 15 W, the thermocouples inserted at the hot and cold surfaces indicated temperatures as 325 K and 300 K. What is the thermal conductivity of the test specimen material?

a.

0.81 W/m K

b.

0.71 W/m k

c.

0.61 W/m K

d.

0.51 W/m K

Discuss
Answer: (b).0.71 W/m k
Q5.
In Cartesian coordinates the heat conduction equation is given by

a.

d²t/dx² + d²t/dy2 + d²t/dz2 + q g = (1/α) (d t/d T)

b.

2d²t/dx² + d²t/dy2 + d²t/dz2 + 34q g = (d t/d T)

c.

d²t/dx² + 3d²t/dy2 + d²t/dz2 = (1/α) (d t/d T)

d.

4d²t/dx² + d²t/dy2 + d²t/dz2 + 1/2q g = (1/α) (d t/d T)

Discuss
Answer: (a).d²t/dx² + d²t/dy2 + d²t/dz2 + q g = (1/α) (d t/d T)
Q6.
The temperature distribution in a large thin plate with uniform surface temperature will be
(Assume steady state condition)

a.

Logarithmic

b.

Hyperbolic

c.

Parabolic

d.

Linear

Discuss
Answer: (d).Linear
Q7.
Let us assume two walls of same thickness and cross-sectional area having thermal conductivities in the ratio 1/2. Let us say there is same temperature difference across the wall faces, the ratio of heat flow will be

a.

1

b.

1/2

c.

2

d.

4

Discuss
Answer: (b).1/2
Q8.
The interior of an oven is maintained at a temperature of 850 degree Celsius by means of a suitable control apparatus. The oven walls are 500 mm thick and are fabricated from a material of thermal conductivity 0.3 W/m degree. For an outside wall temperature of 250 degree Celsius, workout the resistance to heat flow

a.

0.667 degree/W

b.

1.667 degree/W

c.

2.667 degree/W

d.

3.667 degree/W

Discuss
Answer: (b).1.667 degree/W
Q9.
A plane slab of thickness 60 cm is made of a material of thermal conductivity k = 17.45 W/m K. Let us assume that one side of the slab absorbs a net amount of radiant energy at the rate q = 530.5 watt/m². If the other face of the slab is at a constant temperature t₂ = 38 degree Celsius. Comment on the temperature with respect to the slab?

a.

87.5 degree Celsius

b.

32 degree Celsius

c.

47.08 degree Celsius

d.

32.87 degree Celsius

Discuss
Answer: (c).47.08 degree Celsius
Q10.
The rate of heat transfer for a plane wall of homogenous material with constant thermal conductivity is given by

a.

Q = kA (t₁-t₂)/δ

b.

Q = 2kAx/ δ

c.

Q = 2kAδx

d.

Q = 2k/δ x

Discuss
Answer: (a).Q = kA (t₁-t₂)/δ
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