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Transformers
Which of the following transformer should never have the secondary open circuited while the primary is energised?
Current transformer
Potential transformer
Auto transformer
Power transformer
Current transformer
Potential transformer
Auto transformer
Power transformer
Answer
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Related Question
Transformers
When the secondary of a transformer is short circuited, the primary inductance _______
Is increased
Is decreased
None of the listed here
Remians unchanged
Is increased
Is decreased
None of the listed here
Remians unchanged
Answer
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Transformers
The no load ratio of a 50 Hz single phase transformer is 6000/250 V. The maximum flux in the core is 0.06 Wb. What is the number of primary turns?
350
450
210
900
350
450
210
900
Answer
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Transformers
Which type of winding is used in 3phase shell-type transformer?
Sandwich type
Rectangular type
Circular type
Cylindrical type
Sandwich type
Rectangular type
Circular type
Cylindrical type
Answer
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Transformers
Which motor is preferred for use in mines where explosive gases exist?
Synchronous motor
Shunt motor
Induction motor
Air motor
Synchronous motor
Shunt motor
Induction motor
Air motor
Answer
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Transformers
Natural air cooling is generally restricted for transformers up to
5 MVA
15 MVA
1.5 MVA
50 MVA
5 MVA
15 MVA
1.5 MVA
50 MVA
Answer
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