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Electrical Machines

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

 power.
 current.
 speed.
 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
  Ns = 120f / p × ( 1 - s ).
  Nr = 120f / p × (1-s).

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Electrical Machines
The direction of rotation of a DC motor can be determined by

  Fleming's left hand rule.
 Fleming's right hand rule.
 Lenz's law.
 Ampere's law.

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Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

 15.92 Nm
 15.28 Nm
 15.6 Nm
 16.55 Nm

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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 975 rpm
 940 rpm
 1000 rpm
 950 rpm

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of starting to running current.
  ratio of starting to running torque.
  ratio of input to output voltage.
  efficiency.

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