Electrical Machines
In a DC generator the actual flux distribution depends upon

  clearance between tips of the adjacent pole shoes.
  shape of the pole shoe.
  all of above.
 size of air gap.

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Electrical Machines
Consider the following statements about commutating poles which are fitted on most large dc Shunt motors: 1. The commutating poles are placed in the geometric neutral plane and their number is usually Equal to the number of main poles 2. The winding on the commutating poles is connected in series with the shunt-field winding on the main poles 3. The polarity of the commutating pole must be that of the next pole further ahead 4. The commutating poles neutralize the reactance voltage produced in the coil undergoing Commutation. Of these statements,

 1 and 4 are correct
 1, 2 and 3 are correct
 1, 2 and 4 are correct
 2, 3 and 4 are correct

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Electrical Machines
DC Motor

  dc shunt motor with field weakening.
  dc series motor.
  dc compound motor.
  dc shunt with armature resistance control.

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Electrical Machines
Short circuit test is performed on a transformer with a certain impressed voltage at rated frequency. If the short circuit test is now performed with the same magnitude of impressed voltage, but at frequency higher than the rated frequency then

 The magnitude of circuit as well as the power factor will decrease.
 The magnitude of current will decrease but the power factor will increase.
 The magnitude will both increase.
 The magnetude of current will increase, but power factor will decrease.

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