Deck 42: A Commercial Air-Conditioning Unit

Question 1

In a typical schematic diagram for a commercial air-conditioning unit, a hexagon represents a ____.

A) Field Splice
B) Component Connection (Unmarked)
C) Receptacle
D) Component Connection (Marked)

Answer 1

Component Connection (Marked)

Question 2

In a typical schematic diagram for a commercial air-conditioning unit, R stands for ____.

A) Receptacle
B) Bleed Resistor
C) Resistor
D) Start Relay

Answer 2

Resistor

Question 3

A commercial air-conditioning unit contains the same devices as a residential system.

Answer 3

False

Question 4

In a commercial air-conditioning unit, the crankcase heater is energized at all times.

Question 5

In a typical schematic diagram for a commercial air-conditioning unit, C stands for Cooling Compensator.

Question 6

In a commercial-air-conditioning unit, the compressor may be operated by a three-phase squirrel-cage induction motor.

Question 7

In a typical schematic diagram for a commercial air-conditioning unit, QT stands for Quad Terminal.

Question 8

In a commercial location, there may actually be several fans operated by the ____.

A) control relay (CR)
B) start capacitor (SC)
C) Indoor Fan Relay (IFR)
D) start relay (SR)

Question 9

Showing only the secondary of the transformer indicates that its power ____.

A) is very low or negligible
B) is variable
C) is almost constant
D) can be derived from almost anywhere

Question 10

In practice, the IFR relay may be used to control the coils of other relays, which connect the ____ to the line.

A) fan motors
B) compressor
C) timer motor
D) current transformer