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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 S.Ns
 Nr
 Zero
 Ns

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 133.22 N-m
 234.76 N-m.
 266.20 N-m.
 cant be determined.

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = P/2*θmech
 θelec = 4/P*θmech
 θelec = θmech
 θelec = 2/P*θmech

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Electrical Machines
The rotor speed of an induction motor is given by

None of these
  Nr = 120f / p × (1-s).
  Ns = 120f /p × ( 1 - r).
  Ns = 120f / p × ( 1 - s ).

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Electrical Machines
Armature reaction depends on which of the following?

 magnitude of load current
 power factor of load
 both 1 and 2
None of these

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Electrical Machines
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected

 in parallel
 in series
 either of these depending on the design of the motor
 through inductive coupling

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