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Electrical Machines

Electrical Machines
Hopkinss test in DC motor is conducted at ?

 None of these.
 Low load.
 No load.
  Full load.

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Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

 76.91 V.
 56.91 V.
 86.91 V.
  66.91 V.

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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
Which of these types of motor is self starting?

  Single phase induction motor.
  Poly-phase induction motor.
  Poly-phase synchronous machine.
  None of these.

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

None of these
  reduces the saturation magnetization.
  increases the hysteresis loss.
  increases the electrical resistivity of iron.

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 excitation and load angle
 supply voltage, load angle and excitation
 supply voltage and load angle
 supply voltage and excitation

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