Hvac Test March

Question 1

Where does supply air go?

Answer 1

To the structure

Question 2

What is Ohm’s law?

Answer 2

E over I R

Question 3

To replace a contactor you need _______.

Answer 3

Number of poles, fla, coil vac

Question 4

Fla means _______.

Answer 4

Full load amps

Question 5

RES means _______.

Answer 5

Resistive amps

Question 6

Rla means _______.

Answer 6

Rated load amps

Question 7

Lra means _______.

Answer 7

Locked rotor amps

Question 8

Component for Lra is _______.

Answer 8

Compressor

Question 9

Another term for Lra is _______.

Answer 9

Inrush current

Question 10

Info needed for replacing a motor includes _______.

Answer 10

Rpm, hp, vac, amps, rotation, frame size

Question 11

Where does the set screw go?

Answer 11

Flat side

Question 12

Which weep hole is removed?

Answer 12

The bottom

Question 13

When replacing a motor you replace _______.

Answer 13

Capacitor / CAP

Question 14

When do you leave fan motor wire over the grill?

Answer 14

Never

Question 15

When replacing a condenser motor what should you measure?

Answer 15

Fan blade position

Question 16

How do you cut the shaft?

Answer 16

Reciprocating Saw, Angle Grinder, Hacksaw

Question 17

On a uni motor with 2 brown wires, where do they go?

Answer 17

Each side of the capacitor

Question 18

The same leg that power run winding powers the _____

Answer 18

C on Cap

Question 19

C on the dual cap stands for _______.

Answer 19

Cap power in / same as run

Question 20

Common of the motor wires goes to _______.

Answer 20

Opposite of run

Question 21

When does common go to capacitor?

Answer 21

Never

Question 22

What’s fan on a dual cap?

Answer 22

Fan start winding

Question 23

What’s herm on dual capacitor?

Answer 23

Compressor start winding

Question 24

Before checking capacitor you need to _____

Answer 24

Turn off power / check for no voltage / discharge w/a 20K Ohm 5-watt resistor, isolate capacitor, then check w/meter

Question 25

A run capacitor is made of _______.

Answer 25

Metal

Question 26

A start capacitor is made of _______.

Answer 26

Plastic

Question 27

A run capacitor should be mounted _______.

Answer 27

Secured with metal strap upright

Question 28

Can you replace a dual capacitor with two single run capacitors?

Answer 28

Yes

Question 29

Can you replace a 370 vac capacitor with a 440?

Answer 29

Yes... up but not down

Question 30

Can you replace a 440 vac capacitor with a 370?

Answer 30

No must be 440

Question 31

A start capacitor must have a _____

Answer 31

Potential relay

Question 32

With number 86 they make a _______.

Answer 32

Hard start kit

Question 33

Start cap and its components are wired how?

Answer 33

5=C 2=S 1=R

Question 34

Symbol for capacitor is _______.

Answer 34

------| C-‐----

Question 35

Capacitors are measured in _______.

Answer 35

Microfarads

Question 36

Abbreviation for mfds is _______.

Answer 36

UF

Question 37

System is running but you read 28vac between L1 and T1, what does that mean?

Answer 37

Voltage drop

Question 38

What's the lowest ohms points in a compressor?

Answer 38

C&R

Question 39

What's the highest ohm points in a compressor?

Answer 39

S&R

Question 40

R&S=8Ohms, R&C=OL, S&C=OL. What does this mean?

Answer 40

Full on Ito

Question 41

#1 most replaced part is _______.

Answer 41

Capacitor

Question 42

#2 most replaced part is _______.

Answer 42

Contactor

Question 43

#3 most replaced part is _______.

Answer 43

Condenser fan motor

Question 44

When a motor is pulling more amps than what it's rated for, it's called _______.

Answer 44

Overamping

Question 45

What tool can be used to check insulation on a motor winding?

Answer 45

Megohmeter