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Mechanical Engineering - Thermodynamics - Discussion

Discussion Forum : Thermodynamics - Section 2 (Q.No. 1)
Thermodynamics
1.
According to Kelvin-Planck's statement of second law of thermodynamics,
it is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
it is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
it is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
14 comments Page 2 of 2.
Sarath said:   8 years ago
In option C, "device" is wrong it should be written as "engine".

So that it become wrong. And both A and C are right.
Mano said:   8 years ago
I think the answer is C.
Subhashree said:   8 years ago
It impossible to construct a heat engine which work cyclically and exchange heat with a single fix reservoir.

100% conversion of heat into work in a heat engine is not possible.
Atanu said:   5 years ago
It is Impossible to Construct a heat engine which will give no other effect except to extract heat from a single reservoir and to equal ammount of work .

H.E
Q rej. =0.
Q add =W net.

Thermal efficiency n = W/Q add =1.
n= 100%,

So answer is A correct.
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