|
| |
Back
ANSWERS TO QUESTIONS Q1. THROUGH Q30 | Up
Neets Module 03-Introduction to Circuit Protection, Control, and Measurement | Next
APPENDIX I GLOSSARY |
3-39
A19.
a. Not acceptable-single throw.
b. Not acceptable-double break.
c. Acceptable-choice #2 (different actuator).
d. Not acceptable-single pole.
e. Not acceptable-no momentary position.
f.
Acceptable-choice #1 (higher rating).
g. Not acceptable-locked position incorrect.
h. Not acceptable-current rating too low.
i.
Not acceptable-voltage rating too low.
A20. The switch operation for smooth and correct operation, the terminals for corrosion, and the
physical condition of the switch.
A21. The magnetic field created in a coil of wire and core will attract a soft iron plunger when current
flows through the coil.
A22. A starter motor and solenoid.
A23. The connections, the plunger, the mechanism that the solenoid actuates, the energizing voltage,
and the coil of the solenoid.
A24. The magnetic field created in a coil of wire will attract aft armature causing a movement in sets of
contacts.
A25. The solenoid provides a mechanical movement of a plunger (a moveable core) while the core of a
relay is fixed.
A26. Control relays and power relays (contactors).
A27. By observing the movement of the contacts if the relay is open or sealed with a transparent cover.
If the relay has an opaque cover, you can "feel" the operation of the relay by placing your finger
on the cover.
A28. The coil should be checked for opens, shorts, or a short to ground; terminal leads should be
checked for charred or burned insulation; the contact surfaces should be checked for film, carbon,
arcing, and contact spacing.
A29. A burnishing tool.
A30. A point bender
|
