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.

## How can we increase the efficiency of a heat engine can we get 100 efficiency if yes how?

The equation is Hot Temperature minus Cold Temperature over Hot Temperature. These temperatures must be in kelvins to work in the equation. Hence the only way to get 100% efficiency is **to have an engine run in an absolute zero vacuum**, which we dont have the technology to produce, assuming its possible at all.

## Can we increase the efficiency of a heat engine by increasing the amount of working substance Why?

At low temperature, the N_{2}O_{4} is compressed and then heated. The increasing temperature causes each N_{2}O_{4} to break apart into two NO_{2} molecules. This **lowers the molecular weight of the working** fluid, which drastically increases the efficiency of the cycle.

## Which is more effective way to increase the efficiency of a Carnot engine?

The efficiency of the carnot engine can be increased by either **increasing the sink temperature** or by decreasing the reservoir temperature.

## What is heat engine efficiency?

Heat engine is a device that performs the conversion of heat energy to mechanical work through cyclic process. The efficiency of a heat engine is defined as **the ratio of work done by the heat engine to heat absorbed per cycle.**

## Can a system be 100% efficient?

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.**

## Why is the heat engine not 100% efficient?

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%.

## What is a good thermal efficiency?

When expressed as a percentage, the thermal efficiency must be **between 0% and 100%**. Efficiency is typically less than 100% because there are inefficiencies such as friction and heat loss that convert the energy into alternative forms.