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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 10°
 60°
 30°
 45°

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Electrical Machines
Hysteresis loss will depends on

 f
 f³
 f²
 f1.6

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Electrical Machines
Synchronous reactance of an alternator represents

 a reactance operating at synchronous speed
 field winding reactance
All of these
 armature reactance and leakage reactance

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = 1/2*ωm
 ωe = ωm
 ωe = 2*ωm
 ωe = 4*ωm

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Electrical Machines
A DC generator without commutator is a

 induction motor
 AC generator
 DC motor
 DC generator

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Field excitaion.
  Armature voltage.
  Armature current.
  Supply voltage.

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