When connecting round metal duct sections, a minimum of ____ self-taping sheet metal screws should be used.

• 5

• 3

• 2

• 4

True or False: The flexible duct system is the most economical.

• True

• False

The applied voltage (the voltage that the unit will actually be drawing) should be within ____ % of the rated voltage of the unit.

• 3

• 7

• 5

• 10

Insulation on duct does not prevent duct from sweating.

• True

• False

A disconnect or shutoff switch should be installed within _____ feet of each unit and within sight of the unit.

• 20

• 25

• 10

• 15

A package unit comes from the factory with the charge inside.

• True

• False

18-4 low-voltage wire is _________.

• 18-gauge wire with 4 conductors inside

• 16-gauge wire with 2 conductors inside

• 20-gauge wire with 4 conductors inside

• 18-gauge wire with 2 conductors inside

An air conditioner in a climate with average humidity will collect about 3 pints of condensate per hour of operation for each ton of air-conditioning.

• True

• False

A ________ is located in an auxiliary drain pan and is wired in series with the low voltage power supply.

• float switch

• pressure switch

• temperature sensor

• humidity sensor

Line sets come in standard lengths of ________.

• 25 feet and 50 feet

• 10 feet and 20 feet

• 30 feet and 60 feet

• 15 feet and 45 feet