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Electrical Machines

Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  None of them.
  Shunt.
  Series.
  Compound.

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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

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

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 6 Ω
 1.9 Ω
 5.7 Ω
 2.2 Ω

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Electrical Machines
The commutator segments of DC machines are made up of

 brass
 copper
 hard-drawn copper
 copper alloy

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 increase.
 either of these.
None of these
 decrease.

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

  On yoke in the pole faces.
 On armature.
None of these
 On yoke in the inter pole gap.

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