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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 -1 < S < 1
 0 < S < 2
 -2 < S < 2
 0 < S < 1

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Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.5 ohm.
  0.1 ohm.
 50 ohm.
 100 ohm.

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Electrical Machines
The commutator segments of DC machines are made up of

 copper
 hard-drawn copper
 copper alloy
 brass

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Electrical Machines
Induction motor operation depends on

 stationary magnetic field.
 either of these.
 rotating magnetic field.
None of these

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

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

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

None of these
 supply frequency
 rotor resistance
 supply voltage

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