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Electrical Machines

Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

  270.
 180.
 45.
 30.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 0 Hz
 5 Hz
 50 Hz
 1 Hz

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Electrical Machines
Which of the DC Motor use flywheel?

 Differently compared motor.
 Cumulatively compound motor.
 Shunt motor.
 Series motor.

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

 leading power factor
All of these
 lagging power factor
 unity power factor

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Hysteresis motor.
 Shaded pole motor.
 Reluctance motor.
  Stepper motor.

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 10Ω
 200Ω
 50Ω
 100Ω

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