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Electrical Machines

Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imin
 Vmax to Imax
 Vmax to Imin
 Vmin to Imax

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 460 V
 230 V
 65 V
 115 V

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Electrical Machines
The function of field regulator in a DC compound motor is to

 none of above.
 control field current.
 vary the armature resistance.
 limit the armature current.

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Electrical Machines
Which of the following motors has low ratings only?

 Resistance split phase
 Capacitor run
 Capacitor start
 Shaded pole

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/ 4Sa
 PZL/4Sp²
 PZL/4S
 PZL/4Sa²

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

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

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