1. DC motors can be operated at a slow speed with a high torque.
a. True
b. False
2. If it is necessary to operate the motor above base speed, the field voltage is increased and armature voltage is fully
applied.
a. True
b. False
3. Generally, DC motors are run at base speed or below.
a. True
b. False
4. A signal electronics module provides the overall drive control.
a. True
b. False
5. When power is applied to the drive, each of the circuit boards is simultaneously checked by the microprocessor.
a. True
b. False
Name: Class: Date:
Unit 47 Solid-State Adjustable Speed Control
6. It is not necessary to have a DC power plant and distribution system due to the wide use of solid-state ____.
a. fuses b. capacitors
c. rectifiers d. transformers
7. Because there is no counter emf when the armature is at a standstill, and its resistance is very low, the current taken
by the armature on startup will be ____.
a. abnormally low b. low
c. high d. abnormally high
8. When operating the motor ____ speed, the armature voltage is reduced accordingly.
a. at base b. below base
c. much above d. above base
9. Rectified and controlled direct current is fed to the armature of the motor by ____ controlled rectifiers.
a. silicon b. aluminum
c. ceramic d. phosphorus
10. With solid-state drives, sufficient space is allowed around power terminals to ensure working room and easy
installation of ____.
a. plug-in kits b. conduits
c. resistors d. tachometers
Name: Class: Date:
Unit 47 Solid-State Adjustable Speed Control