1I'm getting "the claim of the engineer is genuine"
Kuch mistake kari hogi maine...[2]
An engineer claims to have developed an engine which develops 3.4 kW while consuming 0.44 Kg of fuel of calorific value of calorific value of 41870 kJ / kg in one hour. The maximum and minimum temperatures recorded in the cycle are 1400 °C & 350 °C respectively. is the claim of the engineer genuine ?
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6 Answers
106efficiency (max) = 1-T1/T2 = 1-(350+273)/(1400+273) = 0.628
Now heat supplied (1hr) = 0.44*41870 = 18422.8 kJ
work done (1hr) = 3.4*3600 kJ = 12240 kJ
efficiency = 12240/18422.8 > 0.628
so it is NOT genuine
edit: missed out the time..
1@ Ashish Your answer is not correct .
Read it carefully and explain you answer !!!
11Efficiency = 1400-350/1673= 1050/1673 = 0.628 =E
Heat supplied = 0.44*41870kJ in 1 hour
Work done = 3.4K*3600 in 1Hour
Effi.=e=3.4K*3600/0.44*41870K = 0.664
e>E Hence it is not genuine
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