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JEE Main Physics Class 11 Thermodynamics Part 2 Questions
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© examsnet.com
Question : 51
Total: 82
In
1
st
case, Carnot engine operates between temperatures
300
K
and
100
K
.
ln
2
nd
case, as shown in the figure, a combination of two engines is used. The efficiency of this combination (in
2
nd
case) will be :
[27-Jul-2022-Shift-2]
same as the
1
st
case.
always greater than the
1
st
case.
always less than the
1
st
case.
may increase or decrease with respect to the
1
st
case.
Validate
Solution:
First case
:
η
=
1
−
100
300
=
2
3
Second case
:
η
net
=
η
1
+
η
2
−
η
1
η
2
η
1
=
1
−
200
300
=
1
3
η
2
=
1
−
100
200
=
1
2
η
net
=
1
3
+
1
2
−
1
6
=
2
3
η
(
first case
)
=
η
(
second case
)
© examsnet.com
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