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Transformers

Transformers
In a transformer the resistance between its primary and secondary is

1000 ohms
Infinite
1 ohm
Zero

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Transformers
In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage. The secondary current is

one-fourth the primary current
equal to the primary current
one-fourth the primary current and equal to the primary current
four times the primary current

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Transformers
By laminating the core of a transformer, we decrease _____

Copper loss
Eddy current loss
Leakage reactance
Hysteresis loss

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Transformers
In a transformer routine efficiency depends upon

Both power factor and load current
Load current
Power factor of load
Supply frequency

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Transformers
In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be

(l-s)Ns
Ns
(Ns-l)s
s.N.

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Transformers
A transformer operates poorly at very low frequencies because _____

None of the listed here
Magnetising current is abnormally high
Primary reactance is too much increased
Permeability of core is increased

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