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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?

 BRY
 RBY
All of these
 BYR

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmin to Imax.
 Vmax to Imin.
 Vmin to Imin.
 Vmax to Imax.

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Electrical Machines
Flux density under trailing pole tips in case of generator will

None of these
 either increase or decrease
 increase
 decrease

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.04, 0.96
 0.04, 1.96
 0.02, 1.98
 0.02, 0.98

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

 1 and 2
 1 and 3
 2 and 3
 1, 2 and 3

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

  15 N.
 20 N.
  None of these.
  Can't be determined.

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