c) A 415V star-connected synchronous induction motor has a stator resistance of 0.5 ohms per phase and a combined rotor and exciter resistance of 2 ohms. On no- load and with unity power factor, the motor draws a line current of 5 amperes. If the excitation current is 10 amperes under no-load unity power factor conditions and 20 amperes under load condition, what is the efficiency of the motor when the line supply current is 100 amperes?

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c)
A 415V star-connected synchronous induction motor has a stator resistance of 0.5
ohms per phase and a combined rotor and exciter resistance of 2 ohms. On no-
load and with unity power factor, the motor draws a line current of 5 amperes. If
the excitation current is 10 amperes under no-load unity power factor conditions
and 20 amperes under load condition, what is the efficiency of the motor when
the line supply current is 100 amperes?
Transcribed Image Text:c) A 415V star-connected synchronous induction motor has a stator resistance of 0.5 ohms per phase and a combined rotor and exciter resistance of 2 ohms. On no- load and with unity power factor, the motor draws a line current of 5 amperes. If the excitation current is 10 amperes under no-load unity power factor conditions and 20 amperes under load condition, what is the efficiency of the motor when the line supply current is 100 amperes?
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