Relating Brake Power (bp) and Indicated Power (ip) of an I C engine, the brake power is always

Relating Brake Power (bp) and Indicated Power (ip) of an I C engine, the brake power is always

Options:

a. less then the indicated power
b. more then the indicated power
c. equals to the indicated power
d. cannot say

Correct Answer: a. less then the indicated power

Explanation:

To obtain mechanical power from combustion of fuel, is the main function of an I C engine. Power is defined as the work done by the engine per unit time. It is the product of force produced by the engine and linear velocity or the product of torque and angular velocity. Therefore, to measure the power of an I C engine, the force or torque as well as speed of an engine have to be measured.

Brake Power (bp) is the power developed by the engine and measured at the output shaft of the engine. It is given by,

bp = (2πNT) / 60

where,

T is torque in N-m and N is the rotational speed of the shaft in rotations per minute.

But as the brake power is measured at the output shaft, some power is consumed to overcome the friction between moving parts from the total power produced by the engine. This total power developed by the engine through combustion of the fuel in combustion chamber is called as Indicated Power (ip). Therefore, the brake power is always less than the indicated power