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Electrical Machines

Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 20°
 18°
 30°
 60°

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

 0.1 µF.
  2 - 3 µF.
 5 - 10 F.
  1 - 2 µF.

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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.
 0.25.
 0.72.
 0.62.

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Differential compound motor.
 Cummulative compound motor.
 Shunt motor.
 Series motor.

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

 in reverse.
 to earth.
  to a DC source.
 to an AC source.

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Electrical Machines
A single-winding single-phase motor has

 low starting torque.
  zero starting torque.
 high starting torque.
 starting torque equal to full-load torque.

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MORE MCQ ON Electrical Machines

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