E-PolyLearning

21. The temperature distribution profile for a solid cylinder is
a. Parabolic
b. Linear
c. Ellipse
d. Hyperbolic
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Answer: (a).Parabolic

22. A slab of 12 cm thickness and generating heat uniformly at 10⁶ 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
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Answer: (a).30000 W/m²

23. 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
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Answer: (b).700 degree Celsius

24. 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
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Answer: (d).One half

25. 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
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Answer: (b).ii and iii

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