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Electrical Machines

Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 current.
 torque.
 speed.
 power.

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  sf / 2.
  sf.
  f / s.
  s2.

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

  delta or star according to need.
  delta.
  star.
None of these

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

  0.02 pu.
  0.08 pu.
 0.01 pu.
 0.16 pu.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  600 rpm.
  3000 rpm.
  3600 rpm.
  500 rpm.

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Electrical Machines
Reluctance and hysteresis motors are the types of which electrical motor?

 Stepper motor.
 DC motor.
  1 - Φ synchronous motor.
 3 - Φ induction motor.

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