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Electrical Machines

Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.1 ohm.
  0.5 ohm.
 50 ohm.
 100 ohm.

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 280 V.
 220 V.
 240 V.
 150 V.

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = P/2*ωm
 ωe = 2/P*ωm
 ωe = ωm
 ωe = P*ωm

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Electrical Machines
Width of a carbon brush should be equal to

 the width more than 3 commutator segment.
 less than the width of commutator segment.
 the width of the 1 to 2 commutator segment.
 the width of the 2 to 3 commutator segment.

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

  the rotating stator flux and rotor flux.
None of these
  magnetizing electric current and back emf.
  the supply voltage and the back emf.

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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
 RBY
 BYR
 BRY

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