# Rate of work done on the piston by burning of the fuel inside the cylinder of IC engine is called

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Rate of work done on the piston by burning of the fuel inside the cylinder of IC engine is called
1. Friction Power
2. Indicated Power
3. Brake power
4. Mechanical power

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Correct Answer - Option 2 : Indicated Power

Explanation:

Engine Performance Parameters:

Indicated Power:

It is the power developed inside the engine cylinder or it is the rate of work done on the piston by burning of the fuel inside the cylinder of IC engine.

$I.P = \frac{{{p_m}LANK}}{{60}}$

Brake Power:

This is the actual power available at the crankshaft and may be called the power output of the engine. It is always less than indicated power.

$B.P = \frac{{2\pi NT}}{{60}}$

Friction Power:

It is the power loss in overcoming the friction between piston and cylinder walls, between the crankshaft and camshaft and their bearings, etc.

It is the difference between Indicated power and Brake power.

F.P = I.P - B.P

∴ B.P = I.P - F.P

Indicated thermal efficiency:

It is the ratio of I.P to fuel power.

${\eta _{ith}} = \frac{{I.P}}{{{{\dot m}_f} \;\times\; CV}}$

Brake thermal efficiency :

It is the ratio of B.P to fuel power.

${\eta _{bth}} = \frac{{B.P}}{{{{\dot m}_f} \;\times \;CV}}$

Mechanical Efficiency :

It is the ratio of brake power to indicated power.

${\eta _m} = \frac{{B.P}}{{I.P}} = \frac{{{\eta _{bth}}}}{{{\eta _{ith}}}}$