Deck 11: Contactors Relays and Overloads

Question 1

One of the most common types of line voltage overloads is a(n) _____________________ mounted between two contacts.

Answer 1

metal disc

Question 2

Contacts are made of silver and cadmium, which resist sticking.

Answer 2

True

Question 3

A load that is purely resistive in nature with no coils to cause induction is called a resistive or ____________________ load.

Answer 3

non-inductive

Question 4

The diagnosis of a faulty contactor encompasses three sections of the contactor: the coil, the contacts, and the ____________________.

Question 5

Name five devices used in the HVAC industry that can be controlled by a relay.

Question 6

The chemical composition of contacts is such that they operate at cool temperatures of up to ____________________% of their current-carrying capacity.

Question 7

Contactors are rated by the ampere draw they can carry.

Question 8

Relays cannot be used to open and close a control circuit.

Question 9

Coil characteristics depend on the type of wire but not the manner in which it is wound.

Question 10

A contactor is used to control an electric load in a control system.

Question 11

What is an internal compressor overload?

Question 12

Overloads can be divided into two basic groups. What are these?

Question 13

Contactors make or break a set of contacts that controls the voltage applied to some load in cooling systems.

Question 14

The _________________________ overload breaks the power to a motor.

Question 15

Briefly describe the types of loads that a contactor can control.

Question 16

The simplest form of overload protection is the ____________________.

Question 17

The contactor contacts must be in good condition to ensure that the proper voltage reaches the load.

Question 18

A(n) ____________________ is an electric device that protects a load from a high ampere draw by breaking a set of contacts.

Question 19

The contacts of a contactor make a complete circuit when the contactor is ____________________, allowing voltage to flow to the controlled load.

Question 20

Fuses cannot be used to protect wires and non-inductive loads, but they provide adequate protection for inductive loads.