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Electrical Machines

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

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

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Electrical Machines
Which of the following represents the pitch factor?

 sin (α/2)
 Cos α²
 Cos α
 Cos (α/2)

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 reduce by 5 %.
 depend on other factors.
 remain unchanged.
 increase by 5 %.

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 4 and 2
 2 and 2
 4 ang 1
 2 and 1

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Electrical Machines
Armature resistance control method is also called as-----------?

 constant torque control
 constant power control
 constant voltage control
 constant current control

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Electrical Machines
In double cage induction motor, the inner cage offers

  high resistance and low reactance.
  high resistance and high reactance.
  low resistance and low reactance.
  low resistance and high reactance.

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