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Under which one of the following sets of conditions will a supersonic compressor have the highest efficiency?   

(a) Rotor inlet velocity is supersonic and exit velocity subsonic; stator inlet velocity is subsonic and exit velocity is subsonic

(b) Rotor inlet velocity is supersonic and exit velocity subsonic: statot inlet velocity is supersonic and exit velocity is subsonic

(c)Rotor inlet velocity is supersonic and exit velocity supersonic; stator inlet is supersonic and exit velocity is subsonic.

(d) Rotor inlet velocity is supersonic and exit velocity supersonic: stator inlet velocity is subsonic and exit velocity is subsonic.

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