Hvac 50 B Every Test Questions

Question 1

An example of a pressure vessel is

Answer 1

A cylinder containing refrigerant

Question 2

A fusible plug is a metal fitting that has a hole drilled through it and the hole is filled with

Answer 2

Material with a low melting point

Question 3

What it is necessary to perform electrical work in an area that has a damp or wet floor, what can be done to minimize the chance of electrical shock ?

Answer 3

Place a rubber mat on the floor, use a wooden ladder, and wear insulated boots and gloves.

Question 4

Electrical power should always be shut off at the _______ or entrance panel and locked out in an approved manner when installing equipment.

Answer 4

Distribution

Question 5

A double insulated drill is

Answer 5

Generally has a plastic case with the electrical connections and motor insulated within the tool

Question 6

In electrical circuits, the ______ wire protects the operator.

Answer 6

Grounding

Question 7

Fires that involve ordinary materials such as paper, cardboard, and wood are classified as type _______ fires.

Answer 7

A

Question 8

Fires that involve ordinary materials such as oil and gas are classified as type _______ fires.

Answer 8

B

Question 9

Fires that involve electrical equipment are classified as type ______ fires.

Answer 9

C

Question 10

Fire extinguishers that can be used on any type of fire, A,B, or C generally contain a _________ to extinguish the fire.

Answer 10

Dry chemical powder

Question 11

True or false : when working in a machine room, safety glasses should NOT be worn because they can fog up and impede your eyesight.

Answer 11

False

Question 12

True or false: It is possible that your hand would suffer frostbite if it comes in contact with liquid R-22 when accidentally releasing refrigerant into the atmosphere(an illegal procedure)

Answer 12

True

Question 13

True or false : As long as the torch is kept moving below the level of the liquid refrigerant in the cylinder so as not to create hotspot, it is OK to heat the cylinder in this manner.

Answer 13

False

Question 14

To insure proper operation of an oxygen cylinder regulator, make sure no oil residue is present.

Answer 14

True

Question 15

Aluminum ladders are safe to use around electrical equipment as long as they have insulation pads on the bottom of the rungs.

Answer 15

False

Question 16

True or false : A necessary safety practice for a technician is to lockout the panel with a padlock and keep the key with you.

Answer 16

True

Question 17

True or false : if you are a refrigeration technician, a warm coat and gloves should be in your truck, even in the middle of the summer.

Answer 17

True

Question 18

Oil must never be used around a(n)________ cylinder.

Answer 18

Oxygen

Question 19

Power tools that are not double insulated must have 3-prong plugs to ensure that the tool is properly ________.

Answer 19

Grounded

Question 20

A way to move equipment across a roof is to use rollers and ________ for a base.

Answer 20

Plywood

Question 21

When referring to large refrigerant or nitrogen tanks and recognition must have

Answer 21

The protective cap MUST be on when the tank is not in use.
Safety goggles or glasses must be worn when moving the tank.
Large tanks should not be carried, they should be secured to an approved cart.

Question 22

wiring and crimping tool is used to

Answer 22

cut and strip wire

Question 23

Air-conditioning and refrigeration reversible

ratchet box wrenches are used to

Answer 23

tighten hex head screws on refrigeration

cabinets

Question 24

flare nut wrenches are used to

Answer 24

tighten or loosen nuts over tubing flares.

Question 25

Tube cutters are used to

Answer 25

cut iron pipe used for natural gas.

Question 26

The gauge manifold is a very important piece of equipment for the air-conditioning and Refrigeration technician; it may include

Answer 26

a four-valve design, including separate valves for the vacuum, low-pressure, high-pressure, and refrigerant cylinder connections

Question 27

The charging cylinder is used

Answer 27

to measure the refrigerant charge into | a refrigeration system.

Question 28

A sling psychrometer is used

Answer 28

To measures the air velocity in a duct system.

Question 29

A draft gauge is used to

Answer 29

determine the carbon monoxide in flue gases.

Question 30

A digital anemometer is used

Answer 30

To determines natural gas and propane | gas

Question 31

The electronic vacuum gauge checks system | pressures

Answer 31

up to 5 psig.

Question 32

Thermometers used in the field may be

Answer 32

electronic type

Question 33

In flue gas installations the pressures for oil or gas may be checked to

Answer 33

a manifold gauge

Question 34

True or false : An electronic leak detector or a microfoam solution can be used while the unit is running.

Answer 34

True

Question 35

Which type of tubing or piping would be used for | natural gas on a gas furnace?

Answer 35

Type L copper

Question 36

Types K and L copper tubing have different

Answer 36

wall thickness

Question 37

When tubing is cut with a tubing cutter, a ________ is often produced from excess material pushed into the end of the pipe from the pressure of the cutter

Answer 37

Burr

Question 38

The maximum temperature at which soldering | (soft soldering) is done is about

Answer 38

842 F

Question 39

Brazing is done at ________ | soldering

Answer 39

higher temperatures than

Question 40

A common filler material used to solder lines | containing potable water is composed of

Answer 40

15%-60% silver.

Question 41

A common filler material used for brazing is | composed of

Answer 41

50/50 tin-lead

Question 42

What heat sources is often for soldering and brazing

Answer 42

Natural Gas

Question 43

A flux is used when soldering to

Answer 43

allow the tubing to fit easily into the fitting

Question 44

When soldering or brazing, the filler metal is melted by

Answer 44

heat from the tubing and fitting.

Question 45

a flare joint

Answer 45

uses a flare on the end of a piece of tubing soldered to a flare on a mating piece of tubing.

Question 46

A swaged joint

Answer 46

is made by expanding one piece of tubing to fit over another piece of tubing of the same diameter is made by expanding one piece of tubing to fit over another piece of tubing of the same diameter

Question 47

What is a Steel pipe joined with

Answer 47

It is joined with threaded fittings.

Question 48

In the thread specification1/2 -14 NPT | the 14 stands for

Answer 48

number of threads per inch.

Question 49

The end of a piece of steel pipe is reamed after it | is cut

Answer 49

to remove the burr from the inside of the pipe.

Question 50

Plastic pipe is often used for

Answer 50

plumbing, venting, and condensate applications.

Question 51

What does a vacuum pump do ?

Answer 51

removes gas molecules from a sealed volume

Question 52

The tool used to create internal threads is called a

Answer 52

Tap

Question 53

The size indicated for the diameter of copper tubing used for plumbing is the

Answer 53

Inside diameter

Question 54

The size indicated for the diameter of ACR copper tubing is the

Answer 54

Outside diameter

Question 55

Filler materials used in te high temperature connection of copper joints are composed of

Answer 55

15%-60% silver

Question 56

Molten solder flows between the 2 base metals being soldered because

Answer 56

Of capillary attraction

Question 57

The proper type of flame from an oxyacetylene torch for silver brazing is

Answer 57

Neutral flame

Question 58

For cleaning ACR copper tubing before soldering, a material that can be used is

Answer 58

Sand clothe

Question 59

Pipe threads are standardized by the ANS. ANS stands for

Answer 59

American national standard

Question 60

Pipe threads, when used on pipe that will contain liquid or vapor under pressure,

Answer 60

Generally have a v shape

Question 61

When joining steel pipe, a ______ should be applied to the threads before connecting.

Answer 61

Pipe dope

Question 62

T or F: k type copper is heavy duty with thick tubing wall ?

Answer 62

True

Question 63

T or F: L type copper is considered medium weight and is used most frequently.

Answer 63

True

Question 64

T or F: M is a lightweight copper and is not commonly used in our industry.

Answer 64

True

Question 65

Luis make a card

Answer 65

Ok I will

Question 65

Two types of tube benders are

Answer 65

pipe and plastic.

Question 66

Never use _______ or _______ to raise the pressure in a refrigeration system.

Answer 66

pure oxygen or air