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Electrical Machines

Electrical Machines
The armature MMF waveform of a DC machine is

  sinusoidal.
  triangular.
  pulsating.
  rectangular.

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Electrical Machines
For which of the following loads, armature reaction is magnetizing in nature?

 pure resistive load
 pure capacitive load
None of these
 pure inductive load

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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 30.
  270.
 180.
 45.

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Electrical Machines
In escalator which motor is used?

  DC shunt motor.
  1 - φ IM.
  3 - φ IM.
  Universal motor.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 4575.4 r.p.m.
 1130 r.p.m.
 1037.5 r.p.m.
 none of above.

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Electrical Machines
In double cage induction motor, the outer cage offers

  high resistance and low reactance.
  low resistance and high reactance.
  low resistance and low reactance.
  high resistance and high reactance.

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