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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 30°
 60°
 45°
 10°

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Shaded pole motor.
 Reluctance motor.
  Stepper motor.
 Hysteresis motor.

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Electrical Machines
The armature MMF waveform of a DC machine is

  triangular.
  rectangular.
  sinusoidal.
  pulsating.

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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

 541.67V, 250 rpm.
 541.67V, 200 rpm.
 2166.67V, 230 rpm.
 2166.67V, 270 rpm.

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Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?

 Shaded pole motor.
  PSC (permanent split capacitor) motor.
 Split phase motor.
None of these

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 30°
 72°
 36°
 18°

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