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Electrical Machines

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

 torque.
 speed.
 power.
 current.

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

 0 V.
  40 V.
 20 V.
 60 V.

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

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

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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is

 2, 3, 4
 2, 3, 4, 5
 2, 3 ,5
 1, 2, 3

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Electrical Machines
The commutator segments of DC machines are made up of

 hard-drawn copper
 copper alloy
 brass
 copper

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

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

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