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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 1 of 2.
Shivasish said:   1 decade ago
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 is clausius's statement of second law.
Arshad said:   1 decade ago
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert all the heat energy into work.
J.d said:   1 decade ago
Indicated thermal efficiency = brake power + friction power.
Manoj said:   1 decade ago
It's impossible to construct a device which works on a cycle and produce network by exchanging heat with a single reservoir.
Busa Sravan Kumar said:   1 decade ago
It is impossible to construct a device which works on a cycle and exchange heat with a single reservoir. It means with only one reservoir we can't exchange heat if there is only one reservoir it means whole heat energy we are giving is converted into 100% work it is not possible. It became the violation of kelvin-plank statement.
Malli said:   1 decade ago
It is impossible because of have a single reservoir.
Manoj said:   10 years ago
The meaning of statement :

1. It is impossible to make a such engine which thermal efficiency is 100%.

T.E = W.D/Heat supplied.

2. All practical engine are irreversible.

3. PMM2 type machine not possible.
Robin parihar said:   9 years ago
Impossible to make an engine whose efficiency is 100%.
Nikhil said:   9 years ago
According to me, the correct answer is c.
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.
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