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Electrical Machines

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

 copper
 hard-drawn copper
 brass
 copper alloy

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sin2δ
 cos2δ
 sinδ
 cosδ

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Electrical Machines
Slip test is performed to determine

All of these
 direct axis reactance and quadrature axis reactance
 slip
 positive sequence reactance and negative sequence reactance

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Electrical Machines
What is the frequency of a alternator, if P = number of poles and N = revolution made per second?

 120N / P Hz.
 120P / N Hz.
  PN / 2 Hz.
 120 / PN Hz.

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Electrical Machines
In a DC compound motor the field regulator is provided to

 control the field flux.
 demagnetize the field partially.
 limit the armature current.
 control the armature flux.

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Electrical Machines
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,

 7.
 4.
  12.
 3.

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