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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

 mica.
 copper.
 cast iron.
  carbon.

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

All of these
 maximum
 minimum
 zero

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Electrical Machines
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected

 in parallel
 through inductive coupling
 either of these depending on the design of the motor
 in series

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Electrical Machines
Flux density under trailing pole tips in case of generator will

 either increase or decrease
 decrease
None of these
 increase

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Electrical Machines
A DC series motor has which of the following characteristics?

 Has its field winding consinting of thick wire and less no of turns.
 Can be started easily without load.
 Has a poor torque.
 Has a almost constant speed.

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Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

  1, 2 and 3.
 2, 3 and 4.
 1, 3 and 4.
 2 and 4.

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