| 6. | The temperature distribution in a large thin plate with uniform surface temperature will be
(Assume steady state condition) |
| a. | Logarithmic |
| b. | Hyperbolic |
| c. | Parabolic |
| d. | Linear |
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Answer: (d).Linear
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| 7. | Let us assume two walls of same thickness and cross-sectional area having thermal conductivities in the ratio 1/2. Let us say there is same temperature difference across the wall faces, the ratio of heat flow will be |
| a. | 1 |
| b. | 1/2 |
| c. | 2 |
| d. | 4 |
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Answer: (b).1/2
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| 8. | The interior of an oven is maintained at a temperature of 850 degree Celsius by means of a suitable control apparatus. The oven walls are 500 mm thick and are fabricated from a material of thermal conductivity 0.3 W/m degree. For an outside wall temperature of 250 degree Celsius, workout the resistance to heat flow |
| a. | 0.667 degree/W |
| b. | 1.667 degree/W |
| c. | 2.667 degree/W |
| d. | 3.667 degree/W |
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Answer: (b).1.667 degree/W
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| 9. | A plane slab of thickness 60 cm is made of a material of thermal conductivity k = 17.45 W/m K. Let us assume that one side of the slab absorbs a net amount of radiant energy at the rate q = 530.5 watt/m². If the other face of the slab is at a constant temperature t₂ = 38 degree Celsius. Comment on the temperature with respect to the slab? |
| a. | 87.5 degree Celsius |
| b. | 32 degree Celsius |
| c. | 47.08 degree Celsius |
| d. | 32.87 degree Celsius |
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Answer: (c).47.08 degree Celsius
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| 10. | The rate of heat transfer for a plane wall of homogenous material with constant thermal conductivity is given by |
| a. | Q = kA (t₁-t₂)/δ |
| b. | Q = 2kAx/ δ |
| c. | Q = 2kAδx |
| d. | Q = 2k/δ x |
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Answer: (a).Q = kA (t₁-t₂)/δ
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