What is Indicated Power (IP) in IC engines?
A
Power measured at the crankshaft B
Power measured at the flywheel C
Power developed inside the engine cylinder D
Power lost due to friction
Analysis & Theory
Indicated Power is the total power developed by the combustion of fuel in the engine cylinder.
Brake Power (BP) is defined as:
A
Power available at the piston B
Power lost due to heat C
Power output at the crankshaft D
Power used for friction
Analysis & Theory
Brake Power is the usable power measured at the output shaft (crankshaft) of the engine.
Which formula correctly defines Brake Power?
A
(2πNT) / 60 B
(2NT) / 60 C
(NT) / (2π) D
60 / (2πNT)
Analysis & Theory
Brake Power (BP) = (2πNT)/60 where T is torque in Nm and N is rpm.
The difference between Indicated Power and Brake Power is called:
A
Friction Power B
Thermal Power C
Net Power D
Gross Power
Analysis & Theory
Friction Power = Indicated Power - Brake Power.
Which instrument is commonly used to measure Brake Power?
A
Tachometer B
Manometer C
Dynamometer D
Barometer
Analysis & Theory
A dynamometer is used to measure Brake Power (BP) at the engine shaft.
What does the term 'Mechanical Efficiency' represent in IC engines?
A
BP/IP B
IP/BP C
IP + BP D
IP - BP
Analysis & Theory
Mechanical Efficiency = (Brake Power / Indicated Power) × 100.
If an engine develops 60 kW of IP and 48 kW of BP, what is the friction power?
A
12 kW B
108 kW C
8 kW D
18 kW
Analysis & Theory
Friction Power = IP - BP = 60 - 48 = 12 kW.
Which of the following factors affects the Brake Power of an engine?
A
Fuel injection pressure B
Load on the engine C
Ambient temperature D
Type of coolant used
Analysis & Theory
Brake Power depends on the load applied to the engine.
Which one of the following represents the correct relationship?
A
IP = BP + FP B
BP = IP + FP C
FP = BP - IP D
BP = IP - ME
Analysis & Theory
Indicated Power = Brake Power + Friction Power.
If Mechanical Efficiency is 80% and IP is 100 kW, then BP is:
A
80 kW B
120 kW C
60 kW D
100 kW
Analysis & Theory
BP = (Mechanical Efficiency × IP) = (0.8 × 100) = 80 kW.