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Electrical Machines

Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 current.
 speed.
 power.
 torque.

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Electrical Machines
Resistance commutation is used generally in case of

  fractional kW DC machines.
 DC machines above 10 kW.
None of these
 DC machines bellow 5 kW.

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Electrical Machines
Induction motors provided with open slots have

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

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Electrical Machines
Transformer action requires a

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

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Electrical Machines
Dynamic braking is employed to brake

None of these
 both 1 and 2
 reversing drive
 non reversing drive

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Electrical Machines
During hunting of a synchronous motor

  harmonic are developed in the armature circuit.
  field excitation increases.
  negative phase sequence currents are generated.
  damper bar develops torque.

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MORE MCQ ON Electrical Machines

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