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Electrical Machines

Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sin2δ
 cosδ
 cos2δ
 sinδ

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Electrical Machines
High starting torque and low starting current is the advantage of

  squirrel cage induction motor.
  slip ring induction motor.
  stepper motor.
  hysteresis motor.

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Electrical Machines
The rotor speed of an induction motor is given by

None of these
  Nr = 120f / p × (1-s).
  Ns = 120f / p × ( 1 - s ).
  Ns = 120f /p × ( 1 - r).

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Electrical Machines
The basic function of a transformer is to change

 the power level
 the frequency
 the level of the voltage
 the power factor

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Electrical Machines
A motor operates in stable region at which of the following slip?

 high slip region
 unity slip
 low slip region
 both 1 and 2

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 zero
 more than 6 V
 6 V
 less than 6 V

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