E-PolyLearning

6. Consider a slab of thickness δ with one side (x = 0) insulated and other side (x = δ) maintained at constant temperature. The rate of uniform heat generation within the slab is q g W/m³. Presuming that the heat conduction is in steady state and one dimensional along x direction, the maximum temperature in the slab would occur at x equal
a. δ/2
b. Zero
c. δ/4
d. δ
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Answer: (b).Zero

7. There occurs heat conduction and internal heat generation at uniform rate within the conduction medium itself in the following cases
(i) Drying of concrete

(ii) Chemical processes

(iii) Fuel elements in a nuclear reaction

Choose the correct option
a. 1 only
b. 2 only
c. 1 and 3
d. 1, 2 and 3
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Answer: (d).1, 2 and 3

8. Suppose heat is conducted due to electrons
Where, i = I/A and p is the resistivity, then
a. q g = 2i² p
b. q g = 3i² p
c. q g = i² p
d. q g = 4i² p
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Answer: (c).q g = i² p

9. 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)
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Answer: (a).(q g) (δ)²/2k (T W1 – TW2)

10. Which one of the following materials are quickly heated by applying high frequency?
a. Textiles
b. Engines
c. Rubber
d. Coal
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Answer: (a).Textiles

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