If an emf at slip frequency is injected at an angle α with existing rotor induced emf, then the ___________

power factor improves and speed changes

power factor worsens and speed changes

Due to the line to ground fault, phase ‘a’ in the induction motor phase supply gets cut, then machine ___________

continues to run with excessive supply current

continues to run with reduced slip

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1.	If an emf at slip frequency is injected at an angle α with existing rotor induced emf, then the ___________
A.	power factor only improves
B.	speed changes
C.	power factor improves and speed changes
D.	power factor worsens and speed changes
Answer» B. speed changes

Discussion

2.	Due to the line to ground fault, phase ‘a’ in the induction motor phase supply gets cut, then machine ___________
A.	continues to run with excessive supply current
B.	continues to run with reduced slip
C.	stalls
D.	all of the mentioned
Answer» B. continues to run with reduced slip

Discussion