Morse test is a type of engine test that is carried out to determine the Indicated Horsepower (I.H.P) of an engine. The I.H.P is the measure of the actual power produced by the engine's combustion process.

The Morse test involves the use of a Prony brake, which is a type of dynamometer that measures the power output of the engine. The engine is connected to the Prony brake, which is used to apply a load to the engine. The load is then gradually increased until the engine is running at its maximum output.

The Morse test is performed by following these steps:

1. The engine is started and allowed to warm up to its normal operating temperature.

2. The Prony brake is connected to the engine, and the load is gradually increased.

3. The engine speed is measured using a tachometer.

4. The Prony brake is adjusted until the engine speed is constant.

5. The brake drum is then cooled with water, and the load is gradually increased again.

6. The engine speed is measured again, and the brake drum is cooled with water.

7. The process is repeated until the engine reaches its maximum output.

8. The I.H.P is calculated using the following formula:

I.H.P = 2πNT/33,000

where N is the engine speed in revolutions per minute (RPM), T is the torque measured by the Prony brake in pound-feet (lb-ft), and π is the mathematical constant pi (approximately 3.1416).

In conclusion, the Morse test is a reliable way of determining the Indicated Horsepower (I.H.P) of an engine. This information is crucial for understanding the engine's performance and efficiency.