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Electrical Machines

Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 maximum
All of these
 zero
 minimum

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

None of these
  starting resistance in the starter.
  stator phases of the motor.
  rotor at slip rings.

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

 Low load.
 None of these.
  Full load.
 No load.

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Electrical Machines
Which of the following motor has the highest power factor at full load?

 Resistance split phase
 Shaded pole
 Capacitor start
 Capacitor run

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

 1450.
  1435.
 1500.
 1440.

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 230 V
 200 V
 460 V
 115 V

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MORE MCQ ON Electrical Machines

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