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Transformers
In case of 3-phase induction motors, plugging means
pulling the motor directly on line without a starter
interchanging two supply phases for quick stopping
locking of rotor due to harmonics
starting the motor on load which is more than the rated load
pulling the motor directly on line without a starter
interchanging two supply phases for quick stopping
locking of rotor due to harmonics
starting the motor on load which is more than the rated load
Answer
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Related Question
Transformers
The eddy current loss in a transformer is directly proportional to _______.
Thickness of core lamination
The supply frequency
Square of thickness of core lamination
The flux density in the core
Thickness of core lamination
The supply frequency
Square of thickness of core lamination
The flux density in the core
Answer
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Transformers
The open circuit test on a transformer gives _______
Copper losses
Total losses
Iron losses
Friction losses
Copper losses
Total losses
Iron losses
Friction losses
Answer
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Transformers
Which of the following transformer should never have the secondary open circuited while the primary is energised?
Potential transformer
Auto transformer
Current transformer
Power transformer
Potential transformer
Auto transformer
Current transformer
Power transformer
Answer
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Transformers
The maximum efficiency of a distribution transformer is
at 80% full load
at 50% full load
at no load
at full load
at 80% full load
at 50% full load
at no load
at full load
Answer
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Transformers
When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is
240 V
120 V
12 V
2,400 V
240 V
120 V
12 V
2,400 V
Answer
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