Question
Question: An ideal gas is taken through the cycle A® B ® C ® A, as shown in the figure. If the net heat suppli...
An ideal gas is taken through the cycle A® B ® C ® A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C ® A is–
A
– 5 J
B
– 10 J
C
– 15 J
D
– 20 J
Answer
– 5 J
Explanation
Solution
DWAB = PDV = (10) (2 – 1) = 10 J
DWBC = 0 (as V = constant)
From first law of thermodynamicsDQ = DW + DU
DU = 0 (process
ABCA is cyclic)
\ DQ = DWAB + DWBC + DWCA
\ DWCA = DQ – DWAB – DWBC = 5 – 10 – 0
= – 5 J