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Course L > Fourth Year - Block G Specialized Systems[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][] > Flashcards

Fourth Year - Block G Specialized Systems[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][] Flashcards

1
Q

What would be the input to an appliance if the meter is a low pressure natural gas meter and it takes 30 seconds for the 2 cubic foot test dial to make one revolution?

A

240,000 Btuh.

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2
Q

What are some things to take into consideration when deciding where to locate (install) a gas furnace?

A

Air supply.

Area with proper clearences.

Condensate[][][][][][][][][][][][][][][]

Placed on level surface[][][][][]

Venting[][][][][][][][][][][][][][][][][][][]

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3
Q

Where would you put valves on a gas line when it runs out of one building and into another?

A

One at each end.

(One as you leave the first building and one as you enter the second building).

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4
Q

What is the manifold pressure for an atmospheric natural gas fired appliance?

A

3 to 4” w.c.

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5
Q

What is the maximum inlet pressure to the appliance regulator for an atmospheric natural gas fired appliance?

A

14” w.c.

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6
Q

What is the sequence of components when installing a gas fired unit heater?

A. Drip leg, Manual shut off, Combination gas valve.

B. Manual shut off, Drip leg, Combination gas valve.

C. Combination gas valve, Manual shut off, Drip leg[]

D. Manual shut off, Combination gas valve, Drip leg[]

A

B. Manual shut off, Drip leg, Combination gas valve.

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7
Q

When replacing an electric boiler on a hot water tank with fossil fuel (gas), what would be some additional considerations?

A

Air supply.

Clearance from combustables.

Condenstate[][][][][][][][][][][][][][][][]

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8
Q

On an oil furnace, where should the manual shut-off be located?

A. Downstream of the tank but upstream of the appliance filter.

B. Downstream of the filter but upstream of the pump[][][][][][][][]]

C. Downstream of the pump but upstream of the burner fuel valve.

D. Downstream of the burner fuel valve but upstream of the burner.

A

A. Downstream of the tank but upstream of the appliance filter.

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9
Q

If a gas appliance is added to an existing system and the pressure drop exceeds allowable limits, what must be done.

A

Connect within 24 inches of the meter or increase the pipe size.

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10
Q

How would you support gas piping that runs on the roof over to a roof top heating unit?

A

Off the ground.

Roof pipe support.

Treated wood blocks.

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11
Q

When would you need to install a tracer wire with underground gas piping?

A

On plastic piping.

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12
Q

Which of the following may be used to test natural gas piping?

A. Carbon monoxide.

B. Carbon dioxide[][]]

C. Water[][][][][][][][][][][]

D. Oxygen[][][][][][][][][]

A

B. Carbon dioxide.

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13
Q

What type of piping may be used for medical gas systems?

A

Type K or L copper.

(Will say “MED” on pipe).

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14
Q

How is medical gas piping joined?

A

Brazed with B-CUP 5.

(B = Brazing, Cu = Copper, P = Phosphorous, 5 = Silver content).

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15
Q

How do you purge medical gas systems?

A

Nitrogen.

(Continuous, oil free dry nitrogen).

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16
Q

What is the colour coding for medical oxygen lines?

A

Green on a white background.

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17
Q

How are fittings cleaned in medical gas systems?

A

Tri sodium phosphate.

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18
Q

How do you perfom a cross connection test on a medical gas system?

A

Test each line seperately with a 5 psig differential between each line.

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19
Q

What system is utilized in order to ensure that the outlets for a medical gas system are hooked up to the correct gas line?

A

Diameter Index Safety System (DISS) or Pin Indexing.

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20
Q

What should be done in order to prevent cross connections during installation of medical gas systems?

A

Label as you go.

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21
Q

How should medical gas piping and fittings be stored?

A

Piping degreased and capped.

Stored in a dry environment[][]]

(Off the floor/Seperate from regular waterpipe).

Stored in sealed bags[][][][][][][][][][][][][][][][][][][][][][]]

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22
Q

Where is the high pressure sensor located on a medical gas system?

A

Downstream of the pressure regulator.

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23
Q

When working with medical gas piping, where should the discharge piping from an oxygen relief valve discharge?

A

Outside.

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24
Q

What is the minimum test pressure and duration for a medical gas piping system?

A

150 psi for 24 hours.

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25
Q

What are the installation requirements for installing a zone shut-off valve within a valve box used for medical gas?

A

3 piece.

If the valve handle is open, the door cannot close.

26
Q

What are the requirments for an alarm in a medical gas system?

A

Audible.

Monitored.

Visual[][][][]

27
Q

How would a vacuum pump for a medical gas system be installed?

A

On an inertia base with flexible connectors.

28
Q

Compressed air systems can be used to operate?

A. Pneumatic controls.

B. Hydraulic controls[]]

C. Electric controls[][][]]

D. Mechanical controls.

A

A. Pneumatic controls.

29
Q

What is the tank called that stores compressed air?

A

Receiver tank.

30
Q

What is the purpose of a receiver tank on a compressed air system?

A

To stop the compressor from cycling.

31
Q

Where are air dryers installed in a compression air system?

A

Downstream of the receiver tank.

32
Q

Where is an aftercooler installed in a compression air system?

A

Downstream of the compressor.

33
Q

Where are pre-filters located for compressed air systems?

A

Before the air dryer.

34
Q

What control energizes the compressor motor?

A

The pressure switch.

35
Q

When taking branch lines off the main, how should they be taken off?

A

They should be taken off the top.

36
Q

How would the piping be graded in a compressed air system if the condensation is considered to be a problem?

A

Down to a drip leg and away from the compressor.

37
Q

Which components would be installed on a typical drop for an air-line?

A

Drip leg.

Filter[][]]

Lubricator.

Regulator[]

Shut-off valve.

38
Q

If the drop line were to be used in a spray painting application, which of the components would be eliminated?

A

The lubricator.

39
Q

What is “silly pipe” or “funny pipe”?

A

SPX-FLEX.

(Rain Bird Funny Pipe).

40
Q

What is the principal concern when installing a yard hydrant?

A

Barrel must drain completely.

41
Q

What is the most common piping material used for lawn irrigation?

A

PVC.

42
Q

What things must be taken into consideration when determining the number of heads required for a lawn irrigation system?

A

Amount of hours of sunlight.

Area of the yard[][][][][][][][][][]]

Type of sprinkler head used.

Water pressure available[][]]

43
Q

How is a lawn irrigation system winterized?

A

Blown out using compressed air.

(Attached downstream of the backflow preventer).

44
Q

Backflow assemblies are tested with what type of guage?

A

Differential pressure guage.

45
Q

What type of backflow preventer would be used on the make-up water line supplying a boiler with 50% glycol?

A

RPBA.

46
Q

When are you required to test an RPBA?

A

After installation.

After repairing[][]

After moving[][][]

Annually[][][][][][][]

Manufacturer’s reccomendations.

47
Q

What is a DCAP?

A

Dual Check w/ Atmospheric Port.

48
Q

What is the minimum height requirement for a PVBA in an irrigation system?

A

300mm.

49
Q

What is the maximum height above the floor that an RPBA can be installed before a platform is needed?

A

5 feet.

(Minimum 2.5 feet).

50
Q

What is the minimum air gap separation required when using a one inch diameter water line to fill a tank?

A

50mm.

(2 x diameter and minimum 1 inch).

51
Q

What method does a drinking fountain use to prevent cross contamination?

A

Air gap.

52
Q

What is the problem if the relief valve is discharging on an RPBA?

A

Faulty #1 check valve.

Faulty #2 check valve with back pressure.

53
Q

What type of backflow prevention does a cooling tower use?

A

Air gap.

RPBA[]]

54
Q

What type of pipe is approved for underground installations of liquefied petroleum gases?

A

Schedule 80 steel with a polyethylene coating.

55
Q

What type of piping will you find in a refinery?

A

Double wall with or without leak path detection.

56
Q

What type of valve is required on stainless steel systems used in food manufacturing?

A

Diaphram valve.

57
Q

What type of piping would you most commonly use in a food and beverage processing plant?

A

Stainless steel.

58
Q

What type of piping would you commonly install for the drainage piping in a hospital laboratory?

A

Pyrex.

(Borosilicate glass).

59
Q

What is the most common type of piping material found in a brewary?

A

Stainless steel.

60
Q

What type of pipe would you not use in a plant that processes fertilizer?

A

Copper.

61
Q

Fixtures in a prison are made of?

A

Stainless steel.

Course L (30 decks)

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