Can a Carnot engine be 100\% efficient?

Can a Carnot engine be 100\% efficient?

In order to achieve 100\% efficiency (η=1), Q2 must be equal to 0 which means that all the heat form the source is converted to work. Hence negative temperature of absolute scale is impossible and we cannot reach absolute 0 temperature. …

What will be the efficiency of a Carnot engine operating between absolute temperature T and zero temperature?

The efficiency of a carnot heat engine is 0.6 when the absolute temperatures of the source and sink are T1andT2 respectively.

Can a Carnot heat engine attains 100\% efficiency justify your answer?

The impossibility of converting heat energy completely into mechanical energy, limits the efficiency of heat engines. Since heat energy can never be transformed completely into mechanical energy, so the efficiency of a heat engine can never be 100 per cent.

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Why 100 efficient engine is not possible?

A heat engine is considered to be 100\% efficient if only all the heat is converted into useful work or mechanical energy. Since heat engines cannot convert all the heat energy into mechanical energy, their efficiency can never be 100\%.

Under what conditions should the efficiency of a Carnot engine be 100\%?

For the efficiency of the Carnot engine to be 1 i.e. 100 \%, either T2 (temperature of the sink) should be zero or T1 (temperature of the source) should be infinite.

Can we consider heat engine 100 efficient Why?

It is impossible for heat engines to achieve 100\% thermal efficiency () according to the Second law of thermodynamics. This is impossible because some waste heat is always produced produced in a heat engine, shown in Figure 1 by the term.

Why can’t we have 100 efficiency?

Explanation: No machine is free from the effects of gravity, and even with wonderful lubrication, friction always exists. The energy a machine produces is always less than the energy put into it (energy input). That is why 100\% efficiency in machines shall not be possible.

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Can the efficiency of an engine be 100?

What is the principle of Carnot engine is Carnot engine 100\% efficient Why Why not?

The efficiency of a Carnot engine depends solely on the temperatures of the hot and cold reservoirs. Carnot’s theorem states that all heat engines between two heat reservoirs are less efficient than a Carnot heat engine operating between the same reservoirs.

Why is Carnot engine Impossible?

Because the Carnot cycle consist of Isothermal process which is not possible to achieve in reality. The perfect Isothermal requires temperature of the system to be constant irrespective of increase in pressure and decrease in volume. Carnot cycle is ideal cycle in nature.

Which of the following engine has 100\% efficiency?

Carnot engine
Efficiency of Carnot engine is 100\% if. η=1-T2T1 for 100\% effeicency η=1 which gives T2=0K.

Can a heat engine have a Carnot efficiency of 100?

No,, never . According to second law of thermodynamics, no heat engine can have 100℅ efficiency. Carnot efficiency depends on only temperature limits. It is given as It can be 100℅ only if the sink temperature is zero or the source temperature is infinite (very large value).

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How do you increase the Carnot efficiency?

To make the Carnot efficiency as high as possible, either T hot should be increased or T cold (temperature of heat rejection) should be decreased. .

What is the meaning of the term ‘Carnot cycle’?

Carnot is an ideal cycle is provides benchmark to compare efficiency of other cycles. Carnot efficiency is the maximum efficiency that can be achieved in a cycle. Carnot is two isothermal and two adiabatic process. That is if we look the diagram on T-S diagram it looks like a SQUARE.

What is t hot and T cold in an engine?

The temperature at which the high temperature reservoir operates ( T Hot ). The temperature at which the low temperature reservoir operates ( T Cold ). The temperature of the combustion gases inside the engine ( T Hot ). The temperature at which the gases are exhausted from the engine ( T Cold ).