Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

  3.33 %.
 3 %.
 0 .001 %.
None of these

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

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Electrical Machines
Consider the following statements: To control the speed of a dc shunt motor above the base speed over a reasonably wide range, the motor must 1. have compensating winding 2. have interpole winding 3. be started using a 3-point starter 4. be started using a 4-point starter Of these statements

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

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