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Electrical Machines

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

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

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

  Transistor series regulator.
  Transistor shunt regulator.
  Zener diode shunt regulator.
None of these

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Electrical Machines
Which of the following motor has the highest power factor at full load?

 Capacitor start
 Shaded pole
 Capacitor run
 Resistance split phase

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Mechanical power.
 Armature current.
 Induced emf.
 Can not be determined.

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Electrical Machines
Induction motors provided with open slots have

  leading power factor.
  less breakdown torque.
  higher efficiency.
  more breakdown torque.

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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.

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

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MORE MCQ ON Electrical Machines

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