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Following diagram represents _________ (a)specific power vs mach number

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Following diagram represents _________

(a) specific power vs mach number

(b) mach number for various propulsion systems

(c) drag polar

(d) lift curve slope

I had been asked this question during an interview for a job.

The question is from Flight Mechanics topic in section Performance and Flight Mechanics of Aircraft Design

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Right answer is (a) specific power vs mach number

The best I can explain: The above diagram is showing specific power vs Mach number relations. As shown in the diagram, specific power is initially increases with Mach number but then after certain value of Mach number it begins to decrease.

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