Worksheet 45-Relays Flashcards
What are relays used for in an aircraft?
A relay is a device that uses a small amount of electrical energy to control a large source of electrical energy.
What is the only moving part of a relay?
The armature is the only moving part of a relay.
What pulls the armature onto the core of a relay?
An electromagnet pulls the armature onto the core.
What are the devices in a relay that make electrical connections?
A set of normally open or normally closed contacts make electrical connections.
What might cause a relay to not actuate (or move inside) when a current is applied?
A broken spring might cause the relay not to retract or disconnect.
What type of relay is build very strongly, has a core that is pulled into the electromagnet, and is deigned to handle high current loads?
A solenoid is a rugged relay that can handle high current loads.
What is the use of an overload relay?
An overload relay is used in circuit breaker applications.
What are the three basic mechanical parts of a relay that could potentially malfunction?
Relays have three basic sections that could cause malfunctions: coil, contacts and mechanical section.
When performing a check of a coil with a multimeter, what would an ‘infinity’ reading indicate?
If a coil is reading infinity, it is open and will not operate.
Referring to the diagram, given the multimeter voltage reading between the indicated test point and ground.
A) 0V
B) 0V
C) 115V
D) 25V
E) 115V
F) 0V
