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Electrical Machines

Electrical Machines
In DC machines internal characteristics are plotted between

 Eg vs load current
 Eg vs Ia
 Vt vs load current
 Vt vs Ia

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Electrical Machines
The change in speed of a DC generator due to increased load is corrected by

  increasing armature resistance.
  increasing input power of the prime mover.
 increasing armature cooling.
  increasing terminal voltage.

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Electrical Machines
Synchronising power of a synchronous motor varies

 directly as synchronous reactances Xs
 inversely as 1/Xs
 directly as Xs2
All of these

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

 Capacitor run motor
 Resistance split phase motor
All of these
 Capacitor split phase motor

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

  Full load current.
 Operating speed.
 Starting torque, operating speed, full load current.
 Starting torque.

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Electrical Machines
In which of the following motors DC excitation is not required?

 3-phase synchronous generator
 3-phase synchronous motor
 hysteresis motor
 reluctance motor

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MORE MCQ ON Electrical Machines

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