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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Conduction With Heat Generation MCQs | Page 2 of 3

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Q11.
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
Q12.
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
Q13.
The insulating material used in dielectric heating is

a.

Coal

b.

Silver

c.

Coin

d.

Wool

Discuss
Answer: (d).Wool
Q14.
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
Q15.
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
Q16.
Dielectric heating apparatus consists of

a.

4 electrodes

b.

Elemental strip

c.

No Insulating material

d.

4 plates

Discuss
Answer: (b).Elemental strip
Q17.
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
Q18.
A 25 mm diameter egg roll (k = 1 W/m degree) is roasted with the help of microwave heating. For good quality roasting, it is desired that temperature at the center of roll is maintained at 100 degree Celsius when the surrounding temperature is 25 degree Celsius. What should be the heating capacity in W/m³ of the microwave if the heat transfer coefficient on the surface of egg roll is 20 W/m² degree?

a.

113.31 k W/m³

b.

213.31 k W/m³

c.

313.31 k W/m³

d.

413.31 k W/m³

Discuss
Answer: (b).213.31 k W/m³
Q19.
The constants of integration are to be determined from the relevant boundary conditions which are
(i) t = t w at r = R
(ii) q g (ฯ€ L R²) = -k (2 ฯ€ R L) (d t/d r)
(iii) Increasing temperature gradient
Choose the correct option?

a.

Only i

b.

Only ii

c.

i and iii

d.

i and ii

Discuss
Answer: (d).i and ii
Q20.
A concrete column used in bridge construction is cylindrical in shape with a diameter of 1 meter. The column is completely poured in a short interval of time and the hydration of concrete results in the equivalent of a uniform source strength of 0.7 W/kg. Determine the temperature at the center of the cylinder at a time when the outside surface temperature is 75 degree Celsius. The column is sufficiently long so that temperature variation along its length may be neglected. For concrete
Average thermal conductivity = 0.95 W/m K
Average density = 2300 kg/m³

a.

190.92 degree Celsius

b.

180.92 degree Celsius

c.

170.92 degree Celsius

d.

160.92 degree Celsius

Discuss
Answer: (b).180.92 degree Celsius
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