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Electrical Machines

Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 25%
 4%
 2%
 5%

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Electrical Machines
The breakdown torque of a synchronous motor varies as

 1/V²
 1/V
 applied voltage V
 V²

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Electrical Machines
In an ideal DC generator the regulation is

 positive.
 high.
 low.
 zero.

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Electrical Machines
Which type of single phase induction motor is having the highest power factor at full load ?

  Capacitor run type.
 Capacitor start.
 Split phase type.
 Shaded pole type.

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Electrical Machines
In above question, find rms line voltage for delta connection?

 50 V.
  230.2 V.
 100 V.
 399 V.

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Electrical Machines
Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is

 1 alone
 1 and 2
 2 and 3
 1 and 3

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