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Choose the correct statement while conducting morse test in I.C. engine- (Where, IHP = Indicated Horse Power, BHP = Brake Horse Power, FHP = Friction Horse Power)

Choose the correct statement while conducting morse test in I.C. engine- (Where, IHP = Indicated Horse Power, BHP = Brake Horse Power, FHP = Friction Horse Power) Correct Answer IHP = BHP + FHP

Explanation:

Morse test:

  • The Morse test is used for measuring the indicated power of the multi-cylinder engines.
  • This test measures the indicated power by cutting out the spark plug of the cylinder by keeping the speed of the engine constant.
  • To understand this test better, suppose break power for a cylinder with the spark plug on is B.P1 and with spark plug cut is B.P’1 then the indicated power will be B.P1 - B.P'1.
  • It is assumed that pumping and friction losses are the same when the spark plug is cut-off or in operation.
  • Friction power = Indicated power of cylinder – Break the power of the cylinder.

 

  •  Indicated power of cylinder = Friction power + Break the power of the cylinder.

Additional Information

The difference between the indicated and the brake power of an engine is known as friction power. The frictional power of an engine can be determined by William's line method.

Willan’s line method:

This method is also known as fuel rate extrapolation method. A graph connecting fuel consumption on Y-axis and brake power on X-axis at constant speed is drawn and it is extrapolated on the negative axis of brake power. The intercept of the negative axis is taken as the friction power of the engine at that speed. 

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