quiz lesson 3

Percentage correct a

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Unformatted text preview: calories, what is the efficiency of the system? Correct B ) 0.7931 System Efficiency = 69 / 87 = 0.7931 = 79.31% 12 million Joules of chemical energy are supplied to a boiler in a power plant. 8 x 10^6 Joules of energy are lost through unburnt fuel. The boiler radiates 1.8 million Joules to the atmosphere. What is the efficiency of the boiler in percentage? Correct A ) 18.3 Energy efficiency = Useful energy output / Total energy input Useful energy output = 12 - 8 - 1.8 = 2.2 million Joules Efficiency of the boiler = 2.2 / 12 x 100 = 18.33% Carnot efficiency is the efficiency of a heat engine....
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