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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 90°
 25° to 30°
 0°
 70° to 85°

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = f1kw1 / f2kw2.
  E1 / E2 = N1kw1 / N2kw2.
  E1 / E2 = N1 / N2.
  E1 / E2 = 1.

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Electrical Machines
Speed of DC motor can be controlled by varying

 applied voltage.
 resistance of armature culture.
 all of these.
 its flux oer pole.

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Electrical Machines
Which of the following alternators contain large number of poles?

None of these
 Aame in both alternators.
 Turbo alternators.
 Hydro alternators.

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Electrical Machines
The three point starter is used for

  Shunt motor.
  Shunt, compound and series motor.
  Shunt motor as well as compound motors.
  Series motor.

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 motor armature terminal.
 motor field terminal.
 generator field terminal.
 generator armature terminal.

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