Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?

None of these
 Split phase motor.
  PSC (permanent split capacitor) motor.
 Shaded pole motor.

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

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Electrical Machines
In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will

  worsen and terminal voltage will fall
  improve and terminal voltage will rise .
  worsen and terminal voltage will rise.
 improve but terminal voltage will fall.

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