Question

1.What is the objective of phasing out an INDUCTION MOTOR before putting the machine into commission? (Steps to follow.) 2. Explain briefly the reaction of the machines if one of the phases is out of phase. 3 .Briefly describe how you will solve the problem if one of the phases is out of phase. 4. How can the direction of rotation be reversed in a three phase induction motors? 5. From the working principle of three phase induction motors, it may be observed that the rotor speed should not reach the synchronous speed produced by the stator. If the speeds become equal what will happen in relation to the following: Relative speed or slip speed. (1) Emf induced in the rotor. (1) Current in the rotor. (1) Torque.

          1.What is the objective of phasing out an INDUCTION MOTOR
before putting the machine into commission? (Steps to follow.)
  2. Explain briefly the reaction of the machines if
one of the phases is out of phase.
3 .Briefly describe how you will solve the problem if one of the
phases is out of phase.
4. How can the direction of rotation be reversed in a three
phase induction motors?
 5. From the working principle of three phase
induction motors, it may be observed that the rotor speed should
not reach the synchronous speed produced by the stator. If the
speeds become equal what will happen in relation to the following:
Relative speed or slip speed. (1) Emf induced in the rotor. (1)
Current in the rotor. (1) Torque.

Added by Jose Ramon F.

Question

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