Electrical Machines
The result of slip test on a 3-phase, 20 KVA, 400 V, 50 Hz connected salient pole alternator is given below- Phase value: Vmax = 100 V, Vmin = 96 V, Imax = 10 A and I min = 7 A. The direct and quadranature axis reactances are respectively

  14.28 and 5.54 Ω.
 14.28 and 9.60 Ω.
 8.248 and 5.54 Ω.
 8.248 and 9.60 Ω.

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Electrical Machines
Which is the arrangement of windings in a core type single phase transformer?

 Half lv inside and half hv outside on each core limb
 Lv on one core limb and hv on the other
 Sandwiched lv and hv discs on each core limb
 Half hv inside and half lv outside on each core limb

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Electrical Machines
Interpoles in a DC motor must be

 Series excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.
 Shunt excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.
 Series excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.
 Shunt excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.

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Electrical Machines
In synchronous generator, inverted V curve is drawn between

 field current on Y-axis and armature current on X-axis
 field current on X-axis and armature current on Y-axis
 field current on Y-axis and power factor on X-axis
 field current on X-axis and power factor on Y-axis

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