Q-3:- An Elevator has 30 induction motor- a star-connected rotor has an induced e.m.f. of 80 volts between slip-rings at standstill on open-circuit. The rotor has a resistance and reactance per phase of I and 4 2 respectively. Calculate current/phase and power factor when (a) slip- rings are short-circuited (b) slip-rings are connected to a star-connected rheostat of 3 Q per phase.

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Q-3:- An Elevator has 30 induction motor- a star-connected rotor has an induced e.m.f. of 80
volts between slip-rings at standstill on open-circuit. The rotor has a resistance and reactance
per phase of I and 4 2 respectively. Calculate current/phase and power factor when (a) slip-
rings are short-circuited (b) slip-rings are connected to a star-connected rheostat of 3 2 per
phase.
Transcribed Image Text:Q-3:- An Elevator has 30 induction motor- a star-connected rotor has an induced e.m.f. of 80 volts between slip-rings at standstill on open-circuit. The rotor has a resistance and reactance per phase of I and 4 2 respectively. Calculate current/phase and power factor when (a) slip- rings are short-circuited (b) slip-rings are connected to a star-connected rheostat of 3 2 per phase.
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