110 Review 2

On a schematic diagram for a residential packaged air conditioning unit, the coil for the compressor contactor will be shown in the ___________________ section of the diagram.

• Line voltage

• Low voltage

• Indoor

• Installation

The following electrical symbol represents a(n) ___________.

• Electric resistance heater

• Shaded pole motor

• Resistor

• Solenoid

What color wire is typically used for neutral conductors in a 120-volt circuit?

• Black

• Green

• White

• Bare copper

The following electrical symbol represents a __________.

• Two-pole motor

• Solenoid

• Transformer

• Heater

How many poles will a circuit breaker need to supply power to a 120-volt single-phase gas furnace?

• One pole

• Two poles

• Three poles

• Four poles

What type of switch is required to open and close the main power source to most heating, cooling, and refrigeration equipment?

• Main breaker

• Disconnect switch

• Contactor

• Two-pole, double-throw switch

How many conductors will be needed to connect the breaker panel to the disconnect for a refrigeration unit rated to operate on 208/230-volt, three-phase power?

• Two conductors

• Three conductors

• Four conductors

• Five conductors

What is the set-point of a thermostat?

• The pressure at which the thermostat will open and close

• The temperature range in which a thermostat can operate

• The temperature at which the thermostat will open and close

• The fixed position of the thermostat contacts

What is often used to control large contactors with high-voltage coils in commercial equipment that is controlled by a low-voltage thermostat?

• Control relays

• Step-up transformers

• Intermediate-voltage contactors

• Lockout relays

An appliance used to take moisture out of the air in a specific area is known as a ___________.

• Humidifier

• Air conditioner

• Dehumidifier

• Air drier