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Electrical Machines

Electrical Machines
Hunting phenomenon is observed in which motor?

 Induction motor.
 DC motor.
  Synchronous motor.
 Both A and C.

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

 27.73 Nm .
 74 Nm.
  65.8 Nm.
 38.5 Nm.

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Electrical Machines
In which of the following motors DC excitation is not required?

 reluctance motor
 hysteresis motor
 3-phase synchronous motor
 3-phase synchronous generator

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Electrical Machines
In DC machines internal characteristics are plotted between

 Eg vs Ia
 Vt vs load current
 Eg vs load current
 Vt vs Ia

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  resonance.
  harmonics.
  crawling.
  cogging.

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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?

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

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