E-PolyLearning

11. Generally heat generated depends on some parameters. It is directly proportional to
a. Time
b. Conductivity
c. Voltage
d. Distance between plates
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Answer: (c).Voltage

12. 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
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Answer: (b).29.73 degree celsius

13. The insulating material used in dielectric heating is
a. Coal
b. Silver
c. Coin
d. Wool
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Answer: (d).Wool

14. Unit of specific resistance is
a. Ohm mm²/m
b. Ohm mm
c. Ohm/m
d. Ohm mm/m
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Answer: (a).Ohm mm²/m

15. 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
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Answer: (b).3.64 m

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