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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 start capacitor run provides

  high staring torque and high power factor.
  high staring torque only.
  none.
  high power factor only.

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 R1 /K
 R1 /K²
 K×R1
 K²R1

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 V
 V²
 f²
 f

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Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Line voltage.
 Slip.
 Running torque.
 Rotor current.

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Electrical Machines
Slot wedges in a dc machine is made up of

 silicon steel.
 fibre.
 cast iron.
 mild steel.

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