Mon Test 1 Flashcards
What is a signal light?
Light to denote a certain condition in a system
A contactor with an overload protector in it is?
Magnetic starter
Referred to as a label or line diagram will show the actual internal wiring
Pictorial diagram
An electrical device that consumes electricity to rotate in an electrical system
Motor
________ are electrical devices that consumes electricity and do useful work
Loads
_______ are loads found in many systems and wiring diagrams that take electric energy and convert it to heat
Heater
______ is a device that creates a magnetic field when energized and causes some action to an electric component such as a relay or valve
Solenoid
The ____ is used to help the installation electrician to wire the unit correctly. It gives specific info about terminals, wire sizes, color coding, and breaker and fuses.
Installation diagram
What is the most important part of a HVAC-R system and why?
Loads - they do all of the work
What is the purpose of the signal light?
Shows the status of a piece of equipment and how it’s operating
How does the pressure switch’s purpose affect its operation?
Determines whether it opens or closes depending on the rise or fall of pressure
Why are thermostats said to be mechanically operated
Bc the sensing element moves a set of contacts by a mechanical linkage
What’s the function of a transformer
To increase or decrease voltage
Normally open contacts open and normally closed contacts close when a relay or contractor is energized. True or false
False
Motors are used in the industry to rotate devices such as compressors, condenser fan motors, pumps, and other devices that require rotating movement. True or false.
True
