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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?

All of these
 BYR
 BRY
 RBY

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Electrical Machines
Maximum power developed depends on

 both 1and 2
 voltage
 load angle
 reactance

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Electrical Machines
Example of double excited machine is

 Both are correct.
 Synchronous motor.
 DC Shunt Motor
None of these

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Electrical Machines
Damper winding is used to

 increase the load current.
 suppress the hunting.
 decrease the load current.
 both 1 and 2.

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Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/3000.
 PN/2.
 PN/60.
 PN/120.

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 over load.
 zero or very low voltage supply.
 all of these.
 high filed circuit resistance.

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