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Electrical Machines

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

 cosδ
 sin2δ
 cos2δ
 sinδ

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 motor field terminal.
 generator armature terminal.
 generator field terminal.
 motor armature terminal.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

 800 Amp.
 320 Amp.
  0.5 Amp.
  400 Amp.

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Electrical Machines
Resistance commutation is used generally in case of

 DC machines bellow 5 kW.
  fractional kW DC machines.
None of these
 DC machines above 10 kW.

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Electrical Machines
Which type of motors are used for lathes?

 Synchronous motor.
 Cage induction motor.
 Either A or B.
 DC shunt motors.

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Electrical Machines
Inter pole winding is connected in-------------------------- ?

 series with main poles
 parallel with main poles
 parallel with armature
 series with armature

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