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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  none of these.
  P.
  P and Z.
  Z.

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

 linearised
 any of the above
 hyperbola
 parabola

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 40 V
 zero
 20 V
 50 V

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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

  201.02 V.
 212 V.
 210 V.
 205 V.

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Electrical Machines
When a synchronous motor is running at synchronous speed, the damper winding produces

 eddy current torque.
 both 1 and 2.
 damping torqe.
 no torque.

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Electrical Machines
The rotor speed of an induction motor is given by

  Ns = 120f /p × ( 1 - r).
None of these
  Nr = 120f / p × (1-s).
  Ns = 120f / p × ( 1 - s ).

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