Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 stator of a induction machine.
 stator of a dc machine.
 rotor of an synchronous machine.
 rotor of a dc machine.

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Electrical Machines
The coil spam

 none of above.
 must be exactly equal to people pitch.
  may or may not be exactly equal to people pitch.
 can never be equal to pole pitch.

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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,

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

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