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AIEEE 2012 Solved Paper
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© examsnet.com
Question : 39
Total: 89
Helium gas goes through a cycle
A
B
C
D
(consisting of two isochoric and isobaric lines) as shown in figure efficiency of this cycle is nearly : (Assume the gas to be close to ideal gas)
15.4
%
9.1
%
10.5
%
12.5
%
Validate
Solution:
Heat given to system
=
(
n
C
v
∆
T
)
A
→
B
+
(
n
C
p
∆
T
)
B
→
C
=
[
3
2
(
n
R
∆
T
)
]
A
→
B
+
[
5
2
(
n
R
∆
T
)
]
B
→
B
→
=
[
3
2
×
V
0
∆
P
]
A
→
B
+
[
5
2
×
2
P
0
×
V
0
]
B
→
C
=
13
2
P
0
V
0
and
W
0
=
P
0
V
0
η
=
Work
heat given
=
P
0
V
0
18
2
P
0
V
0
×
100
=
15.4
%
© examsnet.com
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