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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°
 60°
 30°

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Electrical Machines
An unexcited single phase synchronous motor is

 reluctance motor.
 AC series motor.
  universal motor.
 repulsion motor.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing all the three leads from the supply.
  disconnecting any one phase.
  transposing any two leads from slip rings.
  transposing any two leads from supply.

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 motor armature terminal.
 generator field terminal.
 generator armature terminal.
 motor field terminal.

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 The torque required.
 The speed of motor.
 The voltage across the terminals.
 None of above.

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Universal motors.
  Stepper motors.
  Reluctance motors.
  Induction motors.

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