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Transformers
Which motor is preferred for use in mines where explosive gases exist?
Air motor
Induction motor
Synchronous motor
Shunt motor
Air motor
Induction motor
Synchronous motor
Shunt motor
Answer
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Related Question
Transformers
In a transformer the energy is conveyed from primary to secondary
None of these
by the flux
through air
through cooling coil
None of these
by the flux
through air
through cooling coil
Answer
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Transformers
A transformer operates poorly at very low frequencies because _____
Permeability of core is increased
None of the listed here
Magnetising current is abnormally high
Primary reactance is too much increased
Permeability of core is increased
None of the listed here
Magnetising current is abnormally high
Primary reactance is too much increased
Answer
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Transformers
The transformer that should never the secondary open circuited when primary is energised is _______
Voltage transformer
Current transformer
Auto transformer
Power transformer
Voltage transformer
Current transformer
Auto transformer
Power transformer
Answer
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Transformers
In a power or distribution transformer about 10 per cent end turns are heavily insulated
None of these
to reflect the line surge and save the winding of a transformer from damage
to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns
to absorb the line surge voltage and save the winding of transformer from damage
None of these
to reflect the line surge and save the winding of a transformer from damage
to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns
to absorb the line surge voltage and save the winding of transformer from damage
Answer
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Transformers
A transformer is an efficient device because
Uses inductive coupling
A static device
Uses capacitive coupling
Uses electric coupling
Uses inductive coupling
A static device
Uses capacitive coupling
Uses electric coupling
Answer
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