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Electrical Machines

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

 increase
 either increase or decrease
 decrease
None of these

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Electrical Machines
In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is

 infinite value
 zero
 any of the above
 maximum

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 less and thin
 large and thin
 less and thick
 large and thick

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Electrical Machines
Which type of motors are preferred in lifts?

 DC shunt motors.
 DC series motors.
None of these
 DC compound motors.

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Electrical Machines
A compound motor has

  both shunt and series field winding.
  only series field winding.
  only shunt field winding.
  tertiary winding.

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

 250 W
 400W
 500 W
 300 W

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