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Electrical Machines

Electrical Machines
In DC machine torque depends on which of the following?

 both A and B
 armature current (I)
 speed
 flux (φ)

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Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 60°
 30°
 18°
 20°

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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
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

  201.02 V.
 205 V.
 210 V.
 212 V.

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Electrical Machines
Capacitor start capacitor run provides

  none.
  high staring torque only.
  high staring torque and high power factor.
  high power factor only.

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Electrical Machines
If input of a transformer is square wave the output will be

 triangular wave.
 square wave.
 sine wave.
  pulsed wave.

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MORE MCQ ON Electrical Machines

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