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Hvac > Hvac 50 B Every Test Questions > Flashcards

Hvac 50 B Every Test Questions Flashcards

To review questions from the entire course

1
Q

An example of a pressure vessel is

A

A cylinder containing refrigerant

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2
Q

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

A

Material with a low melting point

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3
Q

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 ?

A

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

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4
Q

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

A

Distribution

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5
Q

A double insulated drill is

A

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

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6
Q

In electrical circuits, the ______ wire protects the operator.

A

Grounding

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7
Q

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

A

A

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8
Q

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

A

B

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9
Q

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

A

C

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10
Q

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

A

Dry chemical powder

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11
Q

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

A

False

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12
Q

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)

A

True

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13
Q

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.

A

False

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14
Q

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

A

True

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15
Q

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

A

False

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16
Q

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

A

True

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17
Q

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.

A

True

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18
Q

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

A

Oxygen

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19
Q

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

A

Grounded

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20
Q

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

A

Plywood

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21
Q

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

A

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.

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22
Q

wiring and crimping tool is used to

A

cut and strip wire

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23
Q

Air-conditioning and refrigeration reversible

ratchet box wrenches are used to

A

tighten hex head screws on refrigeration

cabinets

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24
Q

flare nut wrenches are used to

A

tighten or loosen nuts over tubing flares.

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25
Q

Tube cutters are used to

A

cut iron pipe used for natural gas.

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26
Q

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

A

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

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27
Q

The charging cylinder is used

A

to measure the refrigerant charge into

a refrigeration system.

28
Q

A sling psychrometer is used

A

To measures the air velocity in a duct system.

29
Q

A draft gauge is used to

A

determine the carbon monoxide in flue gases.

30
Q

A digital anemometer is used

A

To determines natural gas and propane

gas

31
Q

The electronic vacuum gauge checks system

pressures

A

up to 5 psig.

32
Q

Thermometers used in the field may be

A

electronic type

33
Q

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

A

a manifold gauge

34
Q

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

A

True

35
Q

Which type of tubing or piping would be used for

natural gas on a gas furnace?

A

Type L copper

36
Q

Types K and L copper tubing have different

A

wall thickness

37
Q

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

A

Burr

38
Q

The maximum temperature at which soldering

(soft soldering) is done is about

A

842 F

39
Q

Brazing is done at ________

soldering

A

higher temperatures than

40
Q

A common filler material used to solder lines

containing potable water is composed of

A

15%-60% silver.

41
Q

A common filler material used for brazing is

composed of

A

50/50 tin-lead

42
Q

What heat sources is often for soldering and brazing

A

Natural Gas

43
Q

A flux is used when soldering to

A

allow the tubing to fit easily into the fitting

44
Q

When soldering or brazing, the filler metal is melted by

A

heat from the tubing and fitting.

45
Q

a flare joint

A

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

46
Q

A swaged joint

A

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

47
Q

What is a Steel pipe joined with

A

It is joined with threaded fittings.

48
Q

In the thread specification1/2 -14 NPT

the 14 stands for

A

number of threads per inch.

49
Q

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

is cut

A

to remove the burr from the inside of the pipe.

50
Q

Plastic pipe is often used for

A

plumbing, venting, and condensate applications.

51
Q

What does a vacuum pump do ?

A

removes gas molecules from a sealed volume

52
Q

The tool used to create internal threads is called a

A

Tap

53
Q

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

A

Inside diameter

54
Q

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

A

Outside diameter

55
Q

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

A

15%-60% silver

56
Q

Molten solder flows between the 2 base metals being soldered because

A

Of capillary attraction

57
Q

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

A

Neutral flame

58
Q

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

A

Sand clothe

59
Q

Pipe threads are standardized by the ANS. ANS stands for

A

American national standard

60
Q

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

A

Generally have a v shape

61
Q

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

A

Pipe dope

62
Q

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

A

True

63
Q

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

A

True

64
Q

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

A

True

65
Q

Luis make a card

A

Ok I will

65
Q

Two types of tube benders are

A

pipe and plastic.

66
Q

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

A

pure oxygen or air

Hvac (29 decks)

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