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Electrical Machines

Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 RBY
All of these
 BRY
 BYR

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 500 VA
 110 VA
 550 VA
 100 VA

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

  35 ppm.
 20 ppm.
 25 ppm.
 45 ppm.

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Electrical Machines
The armature shaft must be able to withstand

 twisting strains due to transmission of torque.
All of these
 bending moment due to weight of the armature.
 any unbalanced magnetic pull on the armature core.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 100W
 1000W
 3000W
 500W

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 reversing the terminals of main winding.
 reversing the terminals of starting winding.
All of these
 interchanging the capacitor from starting winding to main winding or vice versa.

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