ELECTRICAL MACHINES QUIZ

 DC Series Motor

 DC Shunt Motor

 Separately Excited DC Motor

 Compound Wound DC Motor

 0.649.

 0.512.

  0.573.

 0.443.

  to neutralize the cross magnetizing effect of the armature reaction.

  to provide path for the circulation of cooling air.

None of these

  mainly to reduce the eddy currents by providing local short circuit.

 Armature current.

 Field flux.

 All of these.

 Applied voltage.

 50 V.

 399 V.

 100 V.

  230.2 V.

  Low.

 1000 ohms.

 Infinitely large.

 around 500 ohms.

 Magnetic neutral armature co-ordinate.

 Magnetic no-load axis.

  Magnetic neutral axis.

 Magnetically no-load armature co-ordinate.

 1

 3 or 4

 2

 0

 Where often load fluctuation is occurred.

 Where voltage variation is needed over a wide load range.

  Where a constant voltage is required over a narrow load range.

 Where the load is very high.

 8 KW.

 0.

  2 KW.

 10 KW.