Question

A heat engine operates between 500C and 250C.
a) Calculate its maximum effeciency. (ans: 32.3%)
b) How much heat must be input to produce a work output of 750 J ? (ans: 2320 J)

Answer 1

a) see Carnot cycle
\[\eta=1-T_c/T_h=50\]

Answer 2

that's is what i thought, but the answer provided says answer is 32.3%

Also, what about part b?

Answer 3

\[\eta=W/Q\]

Answer 4

using given 23% you will get that Q.
but I think 50% is right

Answer 5

sorry 32.2%

Answer 6

with the information given it has to be 50? must be a mistake

Answer 7

right

Answer 8

hey man thanks I really appreciate your time. just needed some validation.

Answer 9

you are welcome