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Transformers
What is the coefficient of coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary?
0.4
9.6
0.96
4
0.4
9.6
0.96
4
Answer
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Related Question
Transformers
Which motor is preferred for use in mines where explosive gases exist?
Induction motor
Shunt motor
Air motor
Synchronous motor
Induction motor
Shunt motor
Air motor
Synchronous motor
Answer
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Transformers
The secondary of a current transformer is always short-circuited under operating conditions because it
avoids core saturation and high voltage induction
None of these
is safe to human beings
protects the primary circuit
avoids core saturation and high voltage induction
None of these
is safe to human beings
protects the primary circuit
Answer
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Transformers
The core type transformer provides _______
Much longer magnetic path
Lesser average length per turn
Shorter magnetic path
None of the listed here
Much longer magnetic path
Lesser average length per turn
Shorter magnetic path
None of the listed here
Answer
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Transformers
A transformer transfers electrical energy from primary to secondary usually with a change in ______
Frequency
Voltage
Power
Time period
Frequency
Voltage
Power
Time period
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
120 V
12 V
2,400 V
240 V
120 V
12 V
2,400 V
240 V
Answer
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