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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 70° to 85°
 25° to 30°
 0°
 90°

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Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 leading
 unity
 lagging
 zero

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Armature voltage.
  Armature current.
  Field excitaion.
  Supply voltage.

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Electrical Machines
Induction motors have the advantage of

  less cost.
  simple in construction.
  all of below.
  less maintenance.

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Electrical Machines
Maximum power developed by a synchronous motor depends on

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

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

All of these
 Operating cost is less.
 Collecting of large current is simple.
 Insulation requirement is less.

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