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Electrical Machines

Electrical Machines
The no load current in a transformer lags the applied voltage by

 90°.
 0°.
  about 75°.
 about 115°.

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Electrical Machines
In case of a conductively compensated DC series motor, the compensating winding is provided

 In parallel with the armature winding.
  In series with the armature winding.
 As a separate unit.
 In parallel with the field winding.

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 22.7 A, secondary = 602.4 A
 primary = 301 A, secondary = 22.7 A
 primary = 11.4 A, secondary = 301 A
 primary = 602 A, secondary = 22.7 A

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 series.
 cumulative compound.
 differential compound.
 shunt.

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Electrical Machines
What are slot wedges in a DC machine made of?

 Silicon steel.
 Fibre.
 Mild steel.
 Cast iron.

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 200Ω
 50Ω
 100Ω
 10Ω

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