The statement "It is impossible to construct a heat engine which can convert heat directly to work completely" was given by

Clausius

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Carnot

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Plank

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Kelvin & Plank

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Solution

The correct option is D Kelvin & Plank
The second law of thermodynamics states , that it is impossible to construct a heat engine , operating in cycle , which extracts heat and can convert it all to useful work .In other words , it is impossible for a heat engine to convert heat completely in work .This statement is given by Kelvin & Plank .

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Similar questions

Q. Assertion :It is impossible to create a heat engine which takes heat energy from a reservoir and completely converts it into work. Reason: Heat energy cannot flow from lower temperature to higher temperature by itself.

In one complete cycle, a heat engine extracts heat $Q_{h}$ from a thermal reservoir, does work W and does not eject any heat into the environment. This heat engine is impossible because its operation violates:

Q. Only a part heat energy absorbed can be converted to work by heat engine because:

Q. Assertion (A) : According to the principle of conservation of energy all heat can be converted
into mechanical work
Reason (R) : Due to various losses, it is impossible to convert all heat into mechanical work.

Q. Consider the following statements.

1.

A heat engine is a device which converts heat energy into mechanical energy.

2.

A heat engine essentially consists of source of heat at higher temperature, working substance and sink of heat at lower temperature.

3.

In a diesel engine, a mixture of fuel vapours and air acts as the working substance.

4.

Efficiency of a petrol engine is greater than diesel engine.
Which of the statements given above are correct?

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