Mechanical Engineering - Automobile Engineering - Discussion
Discussion Forum : Automobile Engineering - Section 4 (Q.No. 24)
24.
The mechanical efficiency (ηm) of an I.C. engine is equal to (where I.P. = Indicated power, B.P. = Brake power and F.P. = Frictional power)
Discussion:
1 comments Page 1 of 1.
Ahsan Gulzar said:
7 years ago
The formula to calculate mechanical efficiency is;
Mechanical efficiency = brake power (B.P) divided by indicated power (I.P) multiplied by 100%.
Mechanical efficiency = (B.P/ I.P)100%.
For example; An engine develops a brake power of 120 kw at the speed of 3000 rev/min. At this speed the indicated power is 140kw. calculate the mechanical efficiency of the engine at this speed.
Mechanical efficency = (120/140)100% = 85.7%.
Mechanical efficiency = brake power (B.P) divided by indicated power (I.P) multiplied by 100%.
Mechanical efficiency = (B.P/ I.P)100%.
For example; An engine develops a brake power of 120 kw at the speed of 3000 rev/min. At this speed the indicated power is 140kw. calculate the mechanical efficiency of the engine at this speed.
Mechanical efficency = (120/140)100% = 85.7%.
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