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Transformers

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

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

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Transformers
Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is

None of these
less than one
approximately equal to one
great than one

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Transformers
Which motor is preferred for use in mines where explosive gases exist?

Air motor
Shunt motor
Induction motor
Synchronous motor

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Transformers
The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8?

8.8 V
88 V
8,800 V
880 V

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Transformers
The noise resulting from vibrations of laminations set by magnetic forces, is termed as

Zoom
Magnetostriction
Hum
Boo

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Transformers
The path of the magnetic flux in transformer should have

low reactance
high resistance
high reluctance
low resistance

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