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Electrical Machines

Electrical Machines
Diverters are used only in

None of these
 either of these
 series motors
 shunt motors

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Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

 3.05+j5.08 ohms
 3.5+j5.8 ohms
 8+j13 ohms
 53+j85 ohms

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Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  pulsating.
  sinusoidal.
 triangular.
  flat topped.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

 31.9 Ω
 15.1 Ω
 15.9 Ω
 31.1 Ω

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 +3.33%
 -3%
 -3.33%
 +3%

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Electrical Machines
On what factors the speed of dc motor depends?

 Field flux.
 Applied voltage.
 All of these.
 Armature current Ia.

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