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Electrical Machines

Electrical Machines
What are slot wedges in a DC machine made of?

 Cast iron.
 Mild steel.
 Fibre.
 Silicon steel.

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 full wave controlled
 full wave
 half wave controlled
 half wave

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Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

 170.
 160.
  150.
 180.

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Electrical Machines
Transformer action requires a

 alternating electric flux.
 alternating magnetic lux.
 constant magnetic flux.
 increasing magnetic flux.

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Electrical Machines
Which type of single phase induction motor is having the highest power factor at full load ?

 Capacitor start.
 Split phase type.
  Capacitor run type.
 Shaded pole type.

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Electrical Machines
Hunting in a synchronous cannot be due to

  variable load.
  variable supply voltage.
  variable frequency.
  windage friction.

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