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Thank you Mr. Alex,,, I apologize to answer The subject is out of my specialty
Thanks En.Alex
Answer will be "D">>>
Answer "D"
Yes it can be higher or lower.
D may be higher or lower
D
D. may be higher or lower
A typical gasoline automobile engine operates at around25% efficiency, and a large coal-fueled electrical generating plant peaks at about46%. The largest diesel engine in the world peaks at51.7%. In a combined cycle plant, thermal efficiencies are approaching60%. Such a real-world value may be used as a figure of merit for the device.
For engines where a fuel is burned there are two types of thermal efficiency: indicated thermal efficiency and brake thermal efficiency. This efficiency is only appropriate when comparing similar types or similar devices.
I have to agree, D