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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?

 60°
 18°
 30°
 20°

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

  Differentical compound.
 Series shunt.
 have an equal number of electrons and protons.
 Cummulative compound.

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

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Electrical Machines
The material used for commutator brushes is mostly

 cast iron.
 copper.
  carbon.
 mica.

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Series motor.
  Shunt motor.
  Cumulative compound motor.
  Differential compound motor.

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Electrical Machines
In case of a conductively compensated DC series motor, the compensating winding is provided

 As a separate unit.
 In parallel with the field winding.
 In parallel with the armature winding.
  In series with the armature winding.

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