IndiaBIX

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.
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.
Sunil Sachdeva said:   8 years ago
I agree @Subhashree.

Let us take an example of a Steam Turbine (as Heat Engine) It 's exhaust Steam give it's residual heat to Condenser. Heat exchange is not limited to Condenser, since Condenser's heat is taken away by Cooling Water/ Atmospheric Air.
(1)
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.
Post your comments here:

Your comments will be displayed after verification.

Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers