MECH 1200 Mechanical Components and Electrical Drives – Quiz 3 Review
Ciletti
1. What components have to be maintained most often with DC motors?
2. Which type of motor can be used for power factor correction?
3. What type of motor has a rotating magnetic field in the stator, and its rotor has a permanent
magnet in it?
4. How would you reverse a 3 phase motor? What would that look like on a schematic?
5. The stator shown in the figure is that of which type of machines?
a.
b.
c.
d.
e.
a split phase induction motor
a synchronous motor
a permanent magnet stepper motor
a permanent magnet dc motor
a brushless dc motor
6. The rotor shown below is that of which motor?
a. squirrel cage induction motor
b. dc motor
c. brushless dc motor
d. capacitor start single phase induction motor
e. permanent magnet stepper motor
7. The rotor shown below can be of which type of motors?
a.
b.
c.
d.
e.
Single phase induction motor
Series dc motor
Shunt dc motor
Permanent magnet dc motor
Synchronous motor
8. What type of motor attached to a turbine for generation of electricity?
9. What type(s) of motors do not need brushes?
10. What type(s) of motors requires the use of slip rings?
MECH 1200 Mechanical Components and Electrical Drives – Quiz 3 Review
Ciletti
Refer to the figure below and answer the questions that follow:
11. What type of motors is the plot shown above for?
a. Synchronous motor
b. Asynchronous motor
c. Series dc motor
d. Compounded dc motor
e. Shunt dc motor
12. What is the full-load speed of the motor?
13. What is the slip at full load speed?
a. 37.5%
b. 12.5%
c. 5%
d. 13.4%
14. If an AC motor is rated at 120 V and 60 Hz, then its frequency was reduced to 50 Hz, what
should be the new operating voltage?
15. If an AC motor is rated at 120 V and 60 Hz, and its operating voltage is 90V, then what is its
operating frequency?
16. What type of motors can operate on both ac and dc power supplies?
17. What is added to the dc motor to reduce sparking in dc motor brushes?
18. If a AC motor has 4 poles per phase, and a synchronous speed of 2000 rpm, what is its operating
frequency?
19. Which type of single phase motors supplies the highest starting torque?
20. List the basic parts of a DC motor and explain how it operates.
21. List the basic parts of an Induction motor and explain how it operates.