# You asked: Is it possible to construct a reversible heat engine of unity efficiency?

Contents

In reality, there is no such thing as a completely reversible engine. All engines, even the most efficient, have frictional losses that render them, at least, slightly irreversible.

## Is a reversible heat engine possible?

This cycle is still known as Carnot’s cycle, but because it is defined to be a reversible cycle, no heat engine can ever be made to operate using it.

## What is the efficiency of a reversible heat engine?

A heat engine operates between 2100 K and 700K. Its actual efficiency is 40%.

## Why is it impossible to design a 100% efficient heat engine?

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%.

## Can the efficiency of heat engine be greater than unity?

Efficiency of a heat engine can’t be greater than efficiency of Carnot’s engine.

## How are the efficiency of any heat engine and reversible heat engine compared?

The efficiency of an irreversible heat engine is always less than the efficiency of a reversible one operating between same two thermal reservoirs. … The efficiencies of all reversible heat engines operating between the same two thermal reservoirs are the same.

## Do all reversible engines have the same efficiency?

All reversible heat engines operating between the two given thermal reservoirs have the same efficiency. The efficiency of reversible heat engine does not depend on the working fluid, it depends only on the temperature of the reservoirs between which it operates.

## Is it possible to improve the efficiency of a reversible heat engine if so how it can be improved?

Assuming very large heat & cold sinks, you can increase the Carnot efficiency by increasing the hot temperature or by decreasing the cold temperature!

## Is it possible to develop a reversible heat engine cycle that is more efficient than a Carnot cycle operating between the same temperature limits?

Thus, the thermal efficiency of an ideal cycle, in general, is less than that of a totally reversible cycle operating between the same temperature limits, i.e., Carnot cycle. Therefore, nobody can develop a cycle more efficient than the Carnot cycle.

## Which has more efficiency reversible or irreversible?

The efficiency of the reversible engine is greater than the irreversible engine. … Irreversible engines are the ones that undergo loss of energy in due course of operation. As the losses in case of irreversible engines are present so naturally, its efficiency will be less as compared to reversible engines.

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## Can you reach 100% thermal efficiency?

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.

## Is it possible to construct a heat engine that produces no thermal pollution Why?

Is it possible to construct a heat engine, which is free from thermal pollution? No, as in accordance with second law of thermodynamics, whole of heat cannot be converted into work.

## Is it possible for a heat engine to convert its total heat into work?

For a heat engine to be functional, it has to operate in a cycle, and given that, the engine cannot convert heat to work completely, not even in principle, which is the Second Law of Thermodynamics.

## Why no heat engine can be constructed having efficiency equal to or greater than unity?

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.

## Can you have a heat engine with efficiency greater than 1?

The efficiency of a heat engine is the work we can do divided by the heat we take out of the hot reservoir. This quantity is always ≤1.

## How can you increase the efficiency of a heat engine?

Therefore, the efficiency of the heat engine can be increased by decreasing the temperature of the cold sink or increasing the temperature of the hot source.

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