Conduction With Heat Generation MCQs

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

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Q21.
A composite slab consists of 5 cm thick layer of steel (k = 146 kJ/m hr degree) on the left side and a 6 cm thick layer of brass (k = 276 kJ/m hr degree) on the right hand side. The outer surfaces of the steel and brass are maintained at 100 degree Celsius and 50 degree Celsius. The contact between the two slabs is perfect and heat is generated at the rate of 4.2 * 10⁵ k J/m² hr at the plane of contact. The heat thus generated is dissipated from both sides of composite slab for steady state conditions. Calculate the temperature at the interface

a.

115.26 degree celsius

b.

125.26 degree celsius

c.

135.26 degree celsius

d.

145.26 degree celsius

Discuss
Answer: (b).125.26 degree celsius
Q22.
In case when both the surfaces of plane wall are at different temperature, we get an expression i.e.

T MAX – T W2 /T W1 – TW2 = (B + 1)²/4B

What is the value of B?

a.

(q g) (δ)²/2k (T W1 – TW2)

b.

(q g) (δ)³/3k (T W1 – TW2)

c.

(q g) (δ)⁴/4k (T W1 – TW2)

d.

(q g) (δ)⁵/5k (T W1 – TW2)

Discuss
Answer: (a).(q g) (δ)²/2k (T W1 – TW2)
Q23.
Which one of the following materials are quickly heated by applying high frequency?

a.

Textiles

b.

Engines

c.

Rubber

d.

Coal

Discuss
Answer: (a).Textiles
Q24.
Generally heat generated depends on some parameters. It is directly proportional to

a.

Time

b.

Conductivity

c.

Voltage

d.

Distance between plates

Discuss
Answer: (c).Voltage
Q25.
Consider a 1.2 m thick slab of poured concrete (k = 1.148 W/m degree) with both of side surfaces maintained at a temperature of 20 degree Celsius. During its curing, chemical energy is released at the rate of 80 W/m³. Workout the maximum temperature of concrete

a.

30.73 degree celsius

b.

29.73 degree celsius

c.

28.73 degree celsius

d.

27.73 degree celsius

Discuss
Answer: (b).29.73 degree celsius
Q26.
The insulating material used in dielectric heating is

a.

Coal

b.

Silver

c.

Coin

d.

Wool

Discuss
Answer: (d).Wool
Q27.
Unit of specific resistance is

a.

Ohm mm²/m

b.

Ohm mm

c.

Ohm/m

d.

Ohm mm/m

Discuss
Answer: (a).Ohm mm²/m
Q28.
What maximum thickness of concrete can be poured without causing the temperature gradient to exceed 98.5 degree Celsius per meter anywhere in the slab? Consider a 1.2 m thick slab of poured concrete (k = 1.148 W/m degree) with both of side surfaces maintained at a temperature of 20 degree Celsius. During its curing, chemical energy is released at the rate of 80 W/m³. Workout the maximum temperature of concrete

a.

2.64 m

b.

3.64 m

c.

4.64 m

d.

5.64 m

Discuss
Answer: (b).3.64 m
Q29.
Dielectric heating apparatus consists of

a.

4 electrodes

b.

Elemental strip

c.

No Insulating material

d.

4 plates

Discuss
Answer: (b).Elemental strip
Q30.
A slab of insulating material of thickness 6 cm and thermal conductivity 1.4kJ/m hr deg is placed between and is in contact with two parallel electrodes, and is then subjected to high frequency dielectric heating at a uniform rate of 140,000kJ/m³ hr. At steady state coefficients of combined radiation and convection are 42 and 48 kJ/m² hr deg. If atmospheric temperature is 25 degree Celsius, find surface temperatures?

a.

144.10 degree Celsius and 134.47 degree Celsius

b.

123.50 degree Celsius and 154.34 degree Celsius

c.

121.60 degree Celsius and 115.45 degree Celsius

d.

165.40 degree Celsius and 165.45 degree Celsius

Discuss
Answer: (c).121.60 degree Celsius and 115.45 degree Celsius
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