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Q.

A continuous flow water heater (geyser) has an electrical power rating of  2kW and efficiency of conversion of electrical power into heat is 80% If water is flowing through device at the constant rate of 100cc/s and the inlet temperature is 100C,the outlet temperature will be (assume density remains constant) 

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a

13.8C

b

12.2C

c

30C

d

20C

answer is B.

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Detailed Solution

 Power P=dQdtP=msdθdt(dQ=msdθ)80100×P=dVdt×ρ×s×dθ80100×2000=100×106×103×4200×(θ10)θ10=3.8θ=13.8C

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