Transformers
The primary coil of a transformer is connected to a 60 V ac source. The secondary coil is connected to a 330 load. The turns ratio is 3:1. What is the secondary voltage?

20 V
2 V
18 V
180 V

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Transformers
In case of 3-phase induction motors, plugging means

interchanging two supply phases for quick stopping
pulling the motor directly on line without a starter
starting the motor on load which is more than the rated load
locking of rotor due to harmonics

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