Electricty

Question 1

What do contactors have?

Answer 1

Coil
Contacts and mechanical linkage

Question 2

Contactors are used on

Answer 2

Residential Ac and heat pumps

Question 3

Solenoid flow control flow

Answer 3

Gas, water and refrigerant

Question 4

What is potential difference

Answer 4

Measures in volts

Question 5

Voltmeters measure

Answer 5

Potential difference between two specific points

Question 6

In A/C

Answer 6

120V (Hot Black)
240V (Black and red or blue)
Ground is always bare wire or green

Question 7

Quantity and intensity

Answer 7

of electrons moving through a conductor
Is amperage

Question 8

Coils increase what?

Answer 8

Accuracy of ammeter

Question 9

Reactance is what?

Answer 9

Resistance when current is flowing

Question 10

In inductive reactance, the magnetic Fidel’s forms with current flow

Answer 10

And so field from one coil affects the next

Question 11

Draw Capacitive Reactance Symbol

Question 12

Current Always leads voltage by

Answer 12

90

Question 13

Impedance is what?

Answer 13

Sum of all types of resistance

Question 14

746 watts

Answer 14

1 HP

Question 15

Three phase circuits

Answer 15

Each loop 120 degrees apart

Polarity changes 7200

Question 16

Conductors have 3 or less

Answer 16

Electrons

Question 17

Insulators are

Answer 17

Materials with 5 or more electrons

Question 18

Circuit breakers

Answer 18

Considered as time delayed devices

Question 19

Switches are wired

Answer 19

In series with load

Question 20

Transformers have two windings which are?

Answer 20

Primary(incoming voltage)
Secondary(outgoing voltage)

Question 21

Solenoid valves (electrically operated)
What type of thing?
Electromagnet coil lift plunger to open or close the valve

Answer 21

It is induction

Question 22

What are relays

Answer 22

Electromagnetism to operate switch and contacts

Question 23

Contactors are control heavier loads and are

Answer 23

Normally open or close

Question 24

Slippage is the difference

Answer 24

Between calculated and real speed

Question 25

Split Phase Motor

Answer 25

Has run and start Start Winding determine direction of directions -disconnects 75% of the rated RPM

Question 26

Symbols for contactors

Answer 26

Are shown de-energized (no power) Normally open

Question 27

Contactors have what elements

Answer 27

Coil, contacts, mechanical linkage

Question 28

Contactors start when

Answer 28

Coil is energize

Question 29

Contractors are mostly used in residential AC and what

Answer 29

Heat pumps

Question 30

What is the first step in troubleshooting a contractor?

Answer 30

Chocolate popper voltage You can also check the mechanical linkage

Question 31

Motors are inductive

Answer 31

Heaters are resistive don’t like the number 

Question 32

Current relays are only used on six metering devices so the pressures equalize is equal

Answer 32

Compressor is off and starting is easier under low head pressure

Question 33

A start capacitor adds what to the system

Answer 33

Starting twerk 

Question 34

The heat bump is a reversible AC unit

Answer 34

AC mode it absorbs heat from the inside space injected to the outside and heat pump, mold, absorbs heat from the outside and then rejects it into the inside. Space

Question 35

Heat pump reversing valve determines indoor outdoor coil function and control from the thermostat. What are the four pipe connections?

Answer 35

Discharge inlet and suction outlet and two outlets changed from indoor to outdoor coils

Question 36

Draw the cooling and heating on the heat pump visually 

Question 37

In cooling mode, the indoor coil absorbs heat, and the outdoor coil reject heat

Question 38

In heating mode and the heat pump, the outdoor coil, absorbs heat, and the indoor coil rejects heat