EMC Chapter 8 Flashcards
A ___ is a device that controls one electrical circuit by opening and closing contacts in another circuit.
relay
Depending on design, relays normally do not control power-consuming devices directly, except for small loads that draw less than ___A.
15
A(n)___ relay is a switching device that has sets of contacts that are closed by a magnetic effort.
electromechanical
A ___ relay is a mechanical switch operated by a magnetic coil.
general-purpose
___ relays are designed for commercial and industrial applications where economy and fast replacement are high priorities.
General-purpose
Relay ___ are described buy their number of poles, throws, and breaks.
contacts
Relays are available with 1 to ___ poles.
12
All contacts can have a maximum of ___ breaks.
two
A relay contact with one pole, two throws, and one break is abbreviated as ___.
SPDT-SB
A form ___ relay has one contact that is NO and closes (makes) when the coil is energized.
A
___ relays are the backbone of electromechanical control circuitry and are expected to have a long life and a minimal amount of problems.
Machine control
___ is/are not an additional feature of machine control delays.
Hermetic sealing
A ___ relay is a fast-operating, single-pole, single-throw switch with normally open contacts hermetically sealed in a glass envelope.
reed
Reed relays are sealed with dry ___, creating a clean inner atmosphere for the contacts.
nitrogen
A ___ switch contains a float, a moving magnet, and a magnetically operated reed switch to detect the level of a liquid.
magnetic level
