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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 1/3
 3
 1/√3
 √3

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Electrical Machines
In escalator which motor is used?

  Universal motor.
  1 - φ IM.
  DC shunt motor.
  3 - φ IM.

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/√3, 1/3
 1/3, 1/√3
 1/3, 1/3
 1/√3, 1/√3

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 2 and 1
 2 and 2
 4 ang 1
 4 and 2

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Electrical Machines
The three point starter is used for

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

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

 2000 Volt.
  0 Volt.
 1600 Volt.
 1500 Volt.

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MORE MCQ ON Electrical Machines

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