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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Q1.
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
Q2.
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
Q3.
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
Q4.
The temperature distribution profile for a solid cylinder is

a.

Parabolic

b.

Linear

c.

Ellipse

d.

Hyperbolic

Discuss
Answer: (a).Parabolic
Q5.
A slab of 12 cm thickness and generating heat uniformly at 10โถ W/m³ has thermal conductivity of 200 W/m degree. Both surfaces of the slab are maintained at 150 degree Celsius. Determine the heat flow rate at the quarter planes

a.

30000 W/m²

b.

40000 W/m²

c.

50000 W/m²

d.

60000 W/m²

Discuss
Answer: (a).30000 W/m²
Q6.
Consider a convective heat flow to water at 75 degree Celsius from a cylindrical nuclear reactor fuel rod of 50 mm diameter. The rate of heat generation is 50000000 W/m³ and convective heat transfer coefficient is I kW/m² K. The outer surface temperature of the fuel element would be

a.

625 degree Celsius

b.

700 degree Celsius

c.

550 degree Celsius

d.

400 degree Celsius

Discuss
Answer: (b).700 degree Celsius
Q7.
For a cylindrical rod with uniformly distributed heat sources, the thermal gradient at half the radius location will be

a.

Four times

b.

Twice

c.

One fourth

d.

One half

Discuss
Answer: (d).One half
Q8.
Consider heat conduction through a solid sphere of radius R. There are certain assumptions

(i) Unsteady state conditions
(ii) One-dimensional radial conduction
(iii) Constant thermal conductivity

Identify the correct statements

a.

i and iii

b.

ii and iii

c.

i, ii and iii

d.

i and ii

Discuss
Answer: (b).ii and iii
Q9.
An 8 cm diameter orange, approximately spherical in shape, undergoes ripening process and generates 18000 k J/m³ hr of energy. If external surface of the orange is at 6.5 degree Celsius, find out the temperature at the center of the orange. Take thermal conductivity = 0.8 k J/ m hr degree for the orange material

a.

13.5 degree Celsius

b.

12.5 degree Celsius

c.

11.5 degree Celsius

d.

10.5 degree Celsius

Discuss
Answer: (b).12.5 degree Celsius
Q10.
A solid sphere of 8 cm radius has a uniform heat generation of 4000000 W/m³. The outside surface is exposed to a fluid at 150 degree Celsius with convective heat transfer coefficient of 750 W/m² K. If thermal conductivity of the solid material is 30 W/m K, determine maximum temperature

a.

444.45 degree Celsius

b.

434.45 degree Celsius

c.

424.45 degree Celsius

d.

414.45 degree Celsius

Discuss
Answer: (b).434.45 degree Celsius
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