1. Two sets of momentary contacts are usually provided with push buttons.
a. True
b. False
2. Some double-break contacts are made of gold.
a. True
b. False
3. In most push buttons, copper-to-silver contact surfaces are provided for better electrical conductivity and longer life.
a. True
b. False
4. The amount of current broken by a push button is usually small.
a. True
b. False
5. Standard control station enclosures may be used in situations requiring submersible protection.
a. True
b. False
Name: Class: Date:
Unit 6 Push Buttons and Control Stations
6. It is possible to control a motor from as many places as there are stations using ____.
a. normally closed contacts b. the red pilot light
c. a pushed closed contact d. the same magnetic controller
7. Normally open and normally closed mean that the contacts are ____.
a. subject to external forces b. subject to mechanical forces
c. in a rest position d. held by surface tension
8. The push-button station enclosure containing the contacts is usually made of molded plastic or ____.
a. integrated metal b. sheet metal
c. heavy metal d. precious metal
9. Selector switch positions are made by ____ the operator knob.
a. turning b. pulling
c. pushing d. releasing
10. A wobble stick is a stem-operated push button for operation ____.
a. at ground level b. in an elevated position
c. from any direction d. at low temperatures
Name: Class: Date:
Unit 6 Push Buttons and Control Stations