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Electrical Machines

Electrical Machines
The no load current in a transformer lags the applied voltage by

  about 75°.
 about 115°.
 0°.
 90°.

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 f
 V
 V²
 f²

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 1.24.
 0.72.
 0.25.
 0.62.

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 1-S
 2-S
 1/S
 S

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 none of above
 armature circuit
 shunt field
 both A and B

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 less and thick
 large and thick
 less and thin
 large and thin

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