Final answer:
The actual power delivered to the propeller of an aircraft engine is known as brake horsepower.
Torque is the force that helps create propulsive power, but brake horsepower measures engine power output before considering propulsive efficiency. Unused energy in an engine typically becomes heat.
So The Correct Option is ; d) Propulsive power
Step-by-step explanation:
The actual power delivered to the propeller of an aircraft engine is called brake horsepower (b). Brake horsepower is the power that is derived from the engine after losses for things like the gearbox and alternator, but before any deduction for the propeller efficiency.
The torque produced by the engine is converted into propulsive power, which is what actually powers the aircraft forward; however, brake horsepower is a measure of the engine's power output without propulsive efficiency factored in.
In an engine, the unused energy is most commonly converted into heat (d), which is why engines need cooling systems to dissipate it. Torque, on the other hand, is the turning or twisting effectiveness of a force (c), and it is critical in determining how power is transferred from the engine to the propeller.
For instance, if a propeller is accelerated from rest to an angular velocity of 1000 rev/min over a period of 6.0 seconds by a constant torque of 2.0 × 10³ N·m, you would calculate the moment of inertia and then the power at a given time (like at 3 seconds into the acceleration).