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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 decrease
 either increase or decrease
 increase
None of these

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Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 50%
 57.7%
 33.3%
 66.3%

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  disconnecting any one phase.
  transposing any two leads from slip rings.
  transposing all the three leads from the supply.
  transposing any two leads from supply.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 zero
 30 rpm
 1500 rpm
 1470 rpm

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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.
  0.5 Amp.
  400 Amp.
 320 Amp.

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 as it carries large load current.
 to reduce the insulation of materials.
 to provide large flux.
 in order to reduce eddy current to provide large flux.

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