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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?

 BYR
All of these
 RBY
 BRY

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 2
 1
 6
 4

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 50 V.
  230.2 V.
 100 V.
 399 V.

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 armature connections.
 shunt field connections.
 armature or field connections.
 series field connections.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.2
 0.02
 0.04
 0.4

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 1/4 of the intial value
 1/2 of the initial value
 4 time the initial value
 twice the initial value

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