# The difference between indicated power and brake power is:

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The difference between indicated power and brake power is:
1. absolute power
2. engine friction loss
3. engine power
4. engine accumulated power

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Correct Answer - Option 2 : engine friction loss

Explanation:

Engine Performance Parameters:

Indicated Power:

• It is the power developed inside the engine cylinder.
• $I.P = \frac{{{p_m}LANK}}{{60}}$

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

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