QUESTIONS 1. Circle which motor(s) have a slip associated with it. a) Series DC

Question

QUESTIONS 1. Circle which motor(s) have a slip associated with it. a) Series DC Motor b) Squirrel-Cage Induction Motor c) Synchronous Motor d) Wound-rotor Induction Motor e) Shunt DC Motor 2. In an induction motor, the rotor spins at a speed a) equal to the stator field speed b) slower than the stator field speed c) faster than the stator field speed 3. The power factor (pf) of a synchronous motor is leading when 2 4. The power factor (pf) of a synchronous motor is lagging when 5. Maximum power is achieved by the synchronous motor when, the power angle is, a) o b) 40 c) 30

Explanation / Answer

1. The correct options are b) Squirrel-Cage induction motor and d) Wound-rotor induction motor

In case of induction motors, slips are associated. The ratio between the rotation rate of the magnetic field induced in the rotor and the rotation rate of the stator's rotating field is called slip.

2. The correct option is b) slower than the stator field speed.

  In an induction motor, the speed of the rotor is always less than the speed of the stator field. However the rotor field rotates faster than the rotor structure so that the rotor and stator fields are synchronized with each other.

3. The correct option is c) pf < 0.

For leading synchronous motors, pf < 0.

4. The correct option is a) pf > 0.

For lagging synchronous motors, pf > 0.

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