Flashcards in Review Deck (18)
Define circuit breakers
A device designed to open and close by non-automatic means, and to open the circuit automatically on a pre-determined condition
What is another name for a pilot light that comes in different colors?
In the case of magnetically opened contacts, the normal state occurs when the operating coil is ______.
A common use of a latching relay is in the rotor circuit of a wound rotor motor.
OSHA does not require that a person whose work requires them to work on energized equipment to have specialized training.
Name three types of fuses
1. Standard one time fuse
2. Time delay or dual element
3. Current limiting
Name three types of circuit breakers
1. Non automatic
5. Ratings molded case
What does ambient temperature affect?
the trip setting of the device
List three types of operators in oil tight units
1. Standard flush head
2. Extended head
3. Mushroom head
4. Key lock
Why is a low voltage indicating light bulb preferred?
due to vibration normally present in machines
What is the difference between a drum switch and a selector switch?
The drum switch is bigger in size, number of contacts and positions.
What is basically a communication carrier that is also used as a power amplifier?
The ______ is really nothing but a memory relay.
The ______ has a distinct advantage when changing relays without disturbing the circuit wiring.
What is generally constructed in a similar fashion to a relay?
The coil of the contactor is generally what voltage?
What is the difference between a contactor and a motor starter?
A starter has a separate overload protection provided.