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Electrical Machines

Electrical Machines
In an induction motor, the no-load slip is generally equal to

 4 %.
 1.5 %.
  less than 1 %.
  zero.

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

 Power factor and field current.
 Torque and field current.
  Armature current and field current.
 Armature current and torque.

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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

 increase
 decrease
 become zero
 remain the same

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Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be

 0.01 Ω.
 0.54 Ω.
 0.06 Ω.
  0.54 Ω.

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Field control.
 Armature control.
 Ward-Leonard control.
 Multiple voltage control.

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 1/2 of the initial value
 4 time the initial value
 twice the initial value
 1/4 of the intial value

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