# Willian’s line method, Morse test and Motoring test can all be used to find which of the following for an IC engine?

By Mandeep Kumar|Updated : August 10th, 2022

1. Indicated power

2. Brake power

3. Indicated mean effective pressure

4. Frictional power

The most common heat engines used in vehicles, boats, ships, airplanes, and trains are called IC engines. The full name of IC engine is Internal combustion engines. It is named so because the fuel in the engine is burned to perform the work inside the engine.

## Answer: Willian’s line method, Morse test and Motoring test can all be used to find the frictional power in an IC engine.

Frictional power is the difference between Indicated power and Brake power. It incorporates friction losses in the flywheel, governor, oil pump, water pump, and other moving parts. It can be determined by the following methods Willian’s line method, Morse test, and Motoring test.

### Willian’s Line Method

It is also known as the fuel rate extrapolation method. To determine the frictional power of an IC engine, a graph is drawn for brake power (kW) on the x-axis and fuel flow rate (kg/hr) on the y-axis on the condition that the engine is running at a constant speed.

### Morse Test

This test is used for finding out the indicated power and the mechanical efficiency of a multi-cylinder auto engine is found out in a very short time.

### Motoring Test

The test in which the engine runs at a constant speed using the motor and the engine is connected to the electric motor is called the Motoring test.

Summary:

## Willian’s line method, Morse test, and Motoring test can all be used to find which of the following for an IC engine.

Out of the given option, Frictional power is the right answer.