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Plumbing Year 4 > Gas RED SEAL > Flashcards

Gas RED SEAL Flashcards

1
Q

what is the maximum pilot input?

A

3% of total input in BTU

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2
Q

Which procedure would be used to measure manifold pressure?

A

remove outlet screw, screw in adaptor, connect manometer and turn on gas.

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3
Q

Which appliance listed below cannot use a double-acting barometric damper?

A

Incinerator

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4
Q

how would a totally blocked vent affect operation of a gas regulator?

A

the pressure would increase

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5
Q

A combustion fan receives an output signal from a/an:

A

electronically commutated motor ECM

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6
Q

how is a flare fitting tightened?

A

wrench and no pipe dope

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7
Q

how is draft verified on a draft hood?

A

a smoke pen before the draft hood

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8
Q

the expected voltage measured between the “L1” and “R” terminals on a conventional furnace with the secondary voltage grounded to the earth ground would be:

A

96 volts

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9
Q

Whats is the limit of the CO gas in a dwelling

A

5 ppm

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10
Q

what is the positive pressure relief setting required for a system supply pressure of 2 psig and an appliance rating of 30” wc?

A

30 “w.c.

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11
Q

Burner output calculation?

efficiency?

A

3600/ avg rev per minute x gauge size x CV = Output

% x output - output = efficiency

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12
Q

when can pipe be re-used?

A

after being inspected, cleaned and tested.

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13
Q

What is the maximum reading on a test gauge for a 50 psig pressure test?

A

200 psig

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14
Q

which is not allowed to be installed?

A

a domestic gas fired clothes dryer in a bathroom

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15
Q

LOOK up PROPANE FILL NUMBERS

A
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16
Q

what would happen if the high limit actuates in a boiler system?

A

cuts power to gas valve

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17
Q

With direct reference to the electrical measurements below, what device is faulty?

i. open circuit test: 20 mv DC
ii. closed circuit test: 12 mv DC
iii. dropout test 6: mv DC

A

Thermocouple

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18
Q

what method is used to seal polypropylene pipe?

A

gasket

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19
Q

what is the maximum distance between identification labels on a residential copper gas line:

A

6 feet

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20
Q

what is the minimum height a b vent can terminate above a sloped roof with a 16/12 pitch?

A

6.5 feet

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21
Q

what is the minimum distance required between a direct vent and a combustion air hood?

A

3 feet

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22
Q

what steps are required to prepare piping for a mechanical compression joint?

A

cut, ream, bevel, and mark

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23
Q

what schedule pipe is required for liquid propane?

A

schedule 80

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24
Q

what size outlet is required for an unknown future connection with a 1-1/4” pipe size downstream of a regulator?

A

1-1/4”

FULL SIZE

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25
Q

what would best describe a document required when adding components to a heating system?

A

As built drawings

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26
Q

what is the problem if the furnace high limit continues to activate during a call for heat?

A

Dirty filter

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27
Q

what is the dirt pocket size for a 4000,000 btuh pool heater with a 3” pipe?

A

2”

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28
Q

what is the minimum time required to pressure test 280 feet of gas line operating at 50 psig?

A

3 hours

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29
Q

propane tanks are inspected by?

A

provincial boiler pressure vessels branch

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30
Q

what is the minimum appliance combustible clearance from a source of ignition in a storage garage?

A

18”

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31
Q

when performing combustion analysis on a natural draft gas fired furnace with an output of 325000 BTUH what is the maximum allowable measurement for CO

A

400 PPM

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32
Q

when a final gas line is connected to the appliance, what test is done?

A

dial test for 10 mins

33
Q

if the fan switch contact(s) do not close during normal operation, which of the following will occur first?

A

the limit switch will open

34
Q

what is the mass of 1 cubic foot of propane liquid?

A

31.7 lbs

35
Q

a properly joined threaded connection will have how many exposed threads?

A

2-3

36
Q

what is the maximum support distance for a 1” horizontal gas line?

A

8 feet

37
Q

what is the minimum bury depth for type “L” copper tubing?

A

15 inches

38
Q

What is the recommended method to join polyethylene piping at a temperature below -20 deg C?

A

electro-fusion

39
Q

how would a partially blocked vent affect the operation of a gas regulator?

A

slow or sluggish operation

40
Q

what is the symptom of a lifting pilot burner flame?

A

too much primary air

41
Q

what is the C to C measurement required for an expansion joint for 2” rooftop gas piping?

A

6.5 feet

42
Q

what is the minimum clearance required from grade to a vent termination below a veranda?

A

1 foot

43
Q

what is the maximum length of flex connector for a decorative appliance.

A

2 foot

44
Q

what are the steps used when replacing an oil fired furnace with a natural gas furnace?

A

remove the furnace, cap the oil line, and remove the storage tank

45
Q

where is the proper installation location of a cooling coil in an up-flow furnace system?

A

in the discharge plenum, downstream of the heat exchanger

46
Q

transformers are sized by:

A

the VA rating

47
Q

what is required for a steam boiler when installed on a non- combustible floor

A

level flat surface

48
Q

from the listed materials below, what hazardous material would most likely be a component of older boiler refractory?

A

asbestos

49
Q

how could a gas fitter determine if a regulator is not a positive shut off type?

A

downstream pressure increases

50
Q

what is the VA limit for a class 2 transformer

A

100 va

51
Q

what fitting cannot be used inside a concealed wall?

A

Union

52
Q

where should a GF install a LWCO on a hydronic heating system?

A

in the supply or return piping above the boiler

53
Q

which of the following materials can be bent?

A

soft drawn

54
Q

what must be installed with plastic piping?

A

a tracer wire ( allows it to be located )

14 gauge

55
Q

what is required when converting an appliance from natural gas to propane?

A

change the information on the rating plate

56
Q

who is responsible to establish and uphold PPE standards?

A

OH&S

57
Q

what must be done after clocking an appliance and the clocked input exceeds the manufacturer’s rating?

A

lower manifold pressure

58
Q

after the pipe surface has been prepared for electro fusion joining and the virgin surface has been exposed, any surface contamination should be removed with:

A

70% isopropyl alcohol concentration

59
Q

what colour wire would normally be 24V power?

A

red

60
Q

how is teflon tape applied?

A

clockwise direction with 50% overlap leaving 2 starter threads

61
Q

when installing a hydronic heating flow switch in a small diameter piping, what can be done if the shortest sensing paddle is too long to fit in the piping?

A

trim the paddle to fit

62
Q

prior to electro fusion of joining HDPE the pipe surface should be prepared by using:

A

an approved rasp tool

63
Q

From the list below, which fitting is prohibited?

A

Continuous thread

64
Q

what is the set point of a low temp boiler with a cut in temp of 20 deg F

A

180 deg F

65
Q

what is the noticeable difference between type “BH” and Type “B” vent?

A

corrosion resistance

66
Q

before entering confine space, what must a GF first check:

A

proper access and egress

67
Q

the recommended spark gap on an intermittent pilot ignition (IPI) pilot assembly is:

A

1/8”

68
Q

what clearance is required between a regulator and an AC unit outside?

A

10 feet

AC unit counts as a source of ignition

69
Q

what is the maximuim allowable pressure in a domestic propane gas distribution system?

A

2 psig

70
Q

a combustion air supply duct is not required for which of the following?

A

an 80 MBH direct vent furnace and a 40 MBH heater

71
Q

when is a permit required to be obtained?

A

when installing a branch run to a new appliance.

72
Q

Pick the tool/s and equipment required to ACCURATELY adjust a regulator.

Flat Blade Screwdriver

Multi-meter

Manometer

Thermometer

A

Flat Blade screwdriver AND Manometer

73
Q

Would the regulators used on the burners in the SAIT gasfitting shop require the vent to be piped outside?

Yes

No

A

NO

74
Q

If a regulator vent becomes blocked or restricted, what would be the expected effect on the operation of the regulator?

Decrease in outlet pressure

Slow / sluggish response to load changes

Increased outlet pressure

No noticeable effect

A

Slow / sluggish response to load changes

75
Q

The primary purpose of a regulator is to reduce pressure.

True
False
A

True

76
Q

When down-stream gas pressure overcomes the force exerted by the regulator spring, would the gas still be able to flow through the regulator?

Yes/No

A

No

77
Q

When gas flow is stopped completely by the regulator, this is known as;

Lock-out

Lock-in

Lock-out

Lock-up

A

Lock-up

78
Q

How would a ripped or torn regulator diaphragm affect the outlet pressure?

Decrease in outlet pressure

Increase in outlet pressure

No-flow through regulator

None of the above

A

Increase in outlet pressure

Plumbing Year 4 (28 decks)

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