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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 parabola
 hyperbola
 linearised
 any of the above

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 234.76 N-m.
 133.22 N-m
 cant be determined.
 266.20 N-m.

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  capacitor run.
  shaded pole type.
  split phase.
  capacitor start.

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

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

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  3000 rpm.
  600 rpm.
  3600 rpm.
  500 rpm.

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  make noise.
  get over heated.
  run normally.
  not run.

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MORE MCQ ON Electrical Machines

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