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Unit 15 > Unit 15 Quiz > Flashcards

Unit 15 Quiz Flashcards

1
Q

How many different colors are used to identify the wires in this schematic?

A

Nine

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2
Q

What is the power supply voltage to the system?

A

115V

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3
Q

What color wires attach the run capacitor to the blower motor?

A

Brown

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4
Q

The low voltage control wires, from the integrated furnace control board, going to the condensing unit contactor outside are connected to what terminals on the control board?

A

Y & C

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5
Q

What protects the low voltage control circuit from drawing too much current?

A

2A slow blow fuse

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6
Q

The Induced Draft Motor (IDM) wires are connected to what connector on the furnace control board?

A

P2

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7
Q

The wires attached to the secondary side of the transformer are what colors?

A

Red & Yellow

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8
Q

When is line voltage connection to the disconnect/junction box accomplished?

A

In the field

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9
Q

The blower motor has how many speed settings?

A

Four

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10
Q

Is the medium-hi speed on the blower motor used in this system?

A

No

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11
Q

The high pressure control and low pressure control are connected in _____ with a ____ colored wire.

A

Series
Purple

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12
Q

The high pressure control is connected to pin ____ on connector P-3.

A

3 & 5

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13
Q

Heat contacts ___ on the rise in temperature and close on the _____ in temperature.

A

Open
Fall or Drop

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14
Q

What can be done if an older clamp-on ammeter cannot measure low current in a circuit?

A

Wrap a coil (10x) to amplify reading and divide that number by ten.

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15
Q

Defrost can be terminated by ____ or ____ .

A

Time
Temperature

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16
Q

Two distinct types of wiring schematics/diagrams are furnished with equipment. What are the diagrams called?

A

Ladder & Pictorial

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17
Q

Unit containing compressor, evaporator, condenser and metering device all in one unit such as a window air conditioner.

A

Packaged air conditioner

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18
Q

Uses power and has either a magnetic coil or a resistance circuit referred to as loads.

A

Power consuming devices

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19
Q

Wired in series in the heat relay coil circuit (heat anticipator) resistor that can vary its resistance.

A

Variable resistor

20
Q

Closes a set of contacts in the high voltage circuit and starts the indoor fan.

A

Fan relay coil

21
Q

Side nearest the power source.

A

Line side of the switch

22
Q

Voltage measured across the start winding in a single-phase motor while it is turning at full speed. Difference in voltage between any two parts of a circuit.

A

Potential voltage

23
Q

Side of the switch the load is connected to.

A

Load side of the switch

24
Q

Passes power on to power consuming devices.

A

Non-power consuming devices

25
Q

A magnetic coil is energized to initiate a heat cycle.

A

Electrical heat relay

26
Q

Short piece of wire with alligator clips or connector on each end used to bypass components in an electrical circuit. Wire gauge should be large enough to handle current in circuit.

A

Insulated jumper

27
Q

Wired in parallel to cooling contacts, non-adjustable resistor.

A

Fixed resistor

28
Q

True or false: the defrost termination solenoid is often referred to as a “Z” coil.

A

True

29
Q

True or false: The ladder diagram is easier to use for locating the different components in the circuit.

A

False

30
Q

True or false: Jump terminals R and C in the thermostat sub-base to energize the heating coil.

A

False

31
Q

True or false: Divide a transformers VA rating by the primary voltage to determine the maximum current the transformer can handle before the low voltage fuse is blown.

A

False

32
Q

True or false: If there is voltage at the light bulb socket and the light bulb fails to illuminate, the bulb is bad.

A

True

33
Q

True or false: If line 1 of a circuit had a potential of 120V and Line 2 was Neutral, the potential voltage (difference) between Line 1 and Line 2 would be 0V.

A

False

34
Q

True or false: the cooling anticipator is bypassed from the circuit when the thermostat is satisfied/opened.

A

False

35
Q

True or false: While troubleshooting a 24-V control circuit consisting of a thermostat, a pressure control, and a contactor coil, the technician reads 24 volts across the thermostat, 0 volts across the pressure control, and 0 volts across the contactor coil. The technician makes the following statements.

A

False (If one is false, all is false)

a. The transformer is burned out. False
b. The thermostat is open. True
c. The contactor coil is energized. False
d. The pressure control contacts are closed. False

36
Q

Electrical controls are divided into two categories; power-passing and ________.

A

Power-consuming

37
Q

While checking a simple series 115V circuit containing a fuse, a switch and a light bulb, the technician’s voltmeter reads 115V across the light bulb socket. The light bulb is not on. He correctly concludes the ______ is defective.

A

Bulb

38
Q

Draw the ladder diagram for an evaporator fan motor with a switch that turns the fan on/off. Power supply is 115V.

A
39
Q

The “Push to Make” button represents what component of the refrigeration module in lab?

A

Thermostat

40
Q

Highlight/mark the path current flows to keep the latching relay powered when the “Push to Make” button is pressed and released.

A
41
Q

The “push to Beak” button represents what component of the refrigeration module in lab?

A

Low pressure control

42
Q

Terminals 2 & 3 (mag aux) on the Square D magnetic starter are represented by what terminals on the latching relay above?

A

A & B

43
Q

What is the expected meter reading when test probes are placed on terminals A & B and the meter is set to volts?

A

OV

44
Q

If a circuit has a current draw of 0 amps, is the load energized?

A

Load not energized

45
Q

If a circuit is comprised of a load and multiple switches wired in series with the load and the load is operating, is it possible that one or more of the switches is in the open position?

A

No

Unit 15 (1 decks)

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