Test 1030

Question 1

The unit of opposition to electron flow is called ___________.

Answer 1

Resistance

Resistance is measured in ohms.

Question 2

Of the three, which type of diagram is best suited to troubleshoot a circuit problem?

Answer 2

Schematic

Schematic diagrams provide a clear representation of the circuit’s components and their connections.

Question 3

Which of the three is best suited to locate a component’s position?

Answer 3

Pictorial

Pictorial diagrams show the physical layout of components.

Question 4

Circle the correct prefix value for ‘2500 watts’.

Answer 4

2.5 KW

2500 watts is equivalent to 2.5 kilowatts.

Question 5

Power from the transformer to the fan relay ________.

Answer 5

G

The letter designation for the fan relay connection may vary based on the system.

Question 6

Power from the transformer to the thermostat ________.

Answer 6

R

R typically indicates the wire to the thermostat.

Question 7

Power from the thermostat to the heating circuit ________.

Answer 7

W

W is commonly used for the heating circuit connection.

Question 8

Power from the thermostat to the cooling circuit ________.

Answer 8

Y

Y is often designated for the cooling circuit.

Question 9

L1 voltage feed from the 240 voltage supply ______.

Answer 9

Black

Black is commonly used for L1 in 240V circuits.

Question 10

L2 voltage feed from the 240 voltage supply ______.

Answer 10

Red

Red is typically used for L2 in 240V circuits.

Question 11

120 voltage hot line ______.

Answer 11

Black

Black is usually the color for hot lines in 120V circuits.

Question 12

120 voltage neutral ______.

Answer 12

White

White wires are standard for neutral connections.

Question 13

120 voltage ground ______.

Answer 13

Green

Green wires are used for grounding in electrical systems.

Question 14

A safety factor of ______ percent must be added to the measured current when sizing a wire.

Answer 14

25

A 25% safety factor is commonly recommended for wire sizing.

Question 15

Where does the ohmmeter get power to read resistance between the probe leads?

Answer 15

Internal battery

Ohmmeters use an internal battery to supply power for resistance measurement.

Question 16

What value remains the same in a parallel circuit?

Answer 16

Voltage

In a parallel circuit, the voltage across all components remains constant.

Question 17

With 240 volts applied to a condensing unit, if the fan motor develops an open circuit, would the compressor lose its voltage?

Answer 17

No

The compressor would still receive voltage as it is in parallel with the fan motor.

Question 18

Which relay has the larger wire size of the relays?

Answer 18

Start relay

Start relays typically require larger wire sizes due to higher current at startup.

Question 19

A double breaker is used for how many volts?

Answer 19

240 volts

Double breakers are commonly used for 240V circuits.

Question 20

Which way do we wrap the wires around screw terminals?

Answer 20

Clockwise

Wires should be wrapped clockwise to ensure a secure connection.

Question 21

The small slot on the face of a 120 volt receptacle identifies what?

Answer 21

Hot connection

The small slot is typically for the hot wire.

Question 22

The green screw on a receptacle or switch is used for attaching it to ground. True or false?

Answer 22

True

The green screw is designated for grounding connections.

Question 23

What do we call a device used to convert potential energy into useful work?

Answer 23

Motor

Motors convert electrical energy into mechanical energy.

Question 24

If the load is not connected in a 24 volt circuit and there is an open fuse, how many volts will read across the fuse?

Answer 24

0 volts

An open fuse will result in no voltage reading across it.

Question 25

The smaller the wire gauge means the diameter of the wire is _____

Answer 25

Larger

A smaller gauge number indicates a thicker wire.

Question 26

What value remains the same in a series circuit?

Answer 26

Current

In a series circuit, the current through all components is the same.

Question 27

The third pin on the base of the 120 volt receptacle is connected to what?

Answer 27

Ground

The third pin is for grounding purposes.

Question 28

What are the two voltages that are available in modern residential housing?

Answer 28

120 volts and 240 volts

These are the standard voltages supplied in residential settings.