1. The squirrel cage induction motor is the most widely used industrial motor.
a. True
b. False
2. The design of the motor will determine the percentage of slip.
a. True
b. False
3. The use of an automatic starter and a control station gives greater operating efficiency.
a. True
b. False
4. Slow and continued speed transfers may activate the overload relays.
a. True
b. False
5. In an automatic speed control for a two-speed, two-winding three-phase motor, the circuit is so designed that a
certain amount of speed must be achieved before the motor can be changed from low to high speed.
a. True
b. False
Name: Class: Date:
Unit 31 Controllers for Two-Speed,Two-Winding (Separate Winding) Motors
6. The squirrel cage induction motor is a ____.
a. constant-speed motor b. reduced-speed motor
c. variable-speed motor d. high-speed motor
7. The operating principle on which the squirrel cage motor is based calls for a rotor ____.
a. turning in the stator direction b. in protection mode
c. revolving within a stator d. operating at high speeds
8. The phrase pairs of poles is used to indicate that ____ poles are always in pairs.
a. reduction b. motor
c. squirrel d. cage
9. Using the formula for speed, the ____ speed of a two-pole motor supplied by 60-hertz electrical energy is
determined.
a. factory-preset b. discrete
c. rated d. synchronous
10. The inactive winding must be open circuited to ____circulating current due to transformer action between the idle
winding and the energized winding.
a. reduce b. prevent
c. monitor d. promote
Name: Class: Date:
Unit 31 Controllers for Two-Speed,Two-Winding (Separate Winding) Motors