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Test Questions Flashcards

1
Q

What is the most common pilot burner?

A

Post aerated

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2
Q

Most common material used for gas lines?

A

Sch 40 black iron

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3
Q

How much should a thermo couple in compass the pilot flame?

A

3/8-1/2”

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4
Q

High limit is a normally closed switch ?
T/F

A

True

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5
Q

How do you reverse a belt driven motor?

A

Reverse wires behind cover plate

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6
Q

Where can you find the setting on a heat anticipator?

A

Stamped on the gas valve

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7
Q

How are boilers rated?

A

BTUH or EDR

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8
Q

What can cause damage to coppers cooler in boiler?

A

Little or no water in the boiler

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9
Q

What are the different types of low water cutoffs?

A

Float and probe type

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10
Q

How is the operating/ limit control wired in boiler?

A

Series and series

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11
Q

How do you select a gauge for hydrostatic pressure?

A

Dial indicating pressure

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12
Q

If paddles are to big on a flow switch what do you do ?

A

Trim them

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13
Q

How do you calculate thread engagement ?

A

Amount of pipe ADDED to face to face measurement

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14
Q

Material that can be flared and used as a flare fitting

A

Copper TUBING

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15
Q

Shut off valve must be installed in conjunction with what?

A

Regulator

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16
Q

Gas pressure closes 2 stage regulator?
True/ false

A

True

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17
Q

What will happen to a diaphragm gas valve if the relief port is blocked?

A

Gas valve will remain closed

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18
Q

What position will the actuator in a diaphragm gas valve end up if the diaphragm ruptures?

A

Remains open if there’s pressure

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19
Q

What are you testing with a dropout test?

A

Testing when the plunger is released by electro magnet

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20
Q

What happens when a furnace doesn’t sense flame?

A

Lockout occurs

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21
Q

What happens when the control board is locked out?

A

De energizes gas valve and pilot system.

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22
Q

What the ground rod compared to flame rod ratio?

A

4:1

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23
Q

What’s the minimum spark gap?

A

1/8”

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24
Q

How long does HSI take to heat up

A

17-34seconds

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25
Q

Watts equal what?

A

Watts = V x A

Power = I x E

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26
Q

If a transformer keeps burning out what do you do?

A

Upsize to

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27
Q

How are transformers measured?

A

VA

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28
Q

Short circuit is what?

A

Two loads in series

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29
Q

What is continuity?

A

Continuous electrical path in a circuit

30
Q

What is a series circuit?

A

Single path for power to reach components

31
Q

What is a parallel circuit ?

A

Multiple paths for power to reach components

32
Q

Heat travels from?

A

Hot - cold

33
Q

Mercury relative density is what ?

A

13.6

34
Q

Sensible heat is ?

A

Heat that can be measured with a thermometer

35
Q

Latent heat?

A

Amount of heat required to change the state of a substance

36
Q

1cuft of Natural gas requires how much air to burn

A

10 cuft

37
Q

1 cuft of propane requires ?

A

24cuft

38
Q

When did rural communities start using natural gas ?

A

1970s

39
Q

What is the heating value of ch4

A

1000 BTU’s

40
Q

High pressure switch is for what?

A

Prevent over-firing

41
Q

Where can you find regulations governing gas installs?

A

B149.1

42
Q

What’s the max btus a class b gas’s fitter can work on ?

A

400,000 and under

43
Q

If the standard info, bulletins have been posted what should be done next?

A

The recommendations

44
Q

3 common uses of natural gas?

A

Cooking, domestic water heating and heating

45
Q

Standard pressure ( STP) is taken at what?

A

60F and 14.7 PSIA

46
Q

Propane gas detector should be located where?

A

Close to the floor as possible

47
Q

Specific gravity is what ?

A

Density of a substance relative to that standard

48
Q

What has the highest ignition temperature?

A

Natural gas

49
Q

Calculate density of a substance =

A

Weight + Volume

50
Q

Min distance of a gas appliance in storage garage?

A

18” (450mm)

51
Q

Sour gas contains an odour called?

A

Hydrogen sulfide

52
Q

1 cuft of water =

1 US GAL=

A

62.4lbs

8.33lbs

53
Q

What are solids liquids and gases compared to?

A

Solids liquids are compared to water

Gas is compared to Air

54
Q

What are the 2 things that affect pressure?

A

Height and density

P= HEIGHT x Density

55
Q

Force =

A

Area x Pressure

56
Q

What is a BTU

A

Amount of heat required to change 1lb of water 1 degree Fahrenheit

57
Q

How many PPM of carbon monoxide can you be exposed to for 8 hours?

A

.005 PPM

58
Q

What type of valve is used on a propane tank for liquid withdrawal?

A

Excess flow valve

59
Q

All propane cylinders must have?

A

A cap

60
Q

What percent of volume are propane tanks filled at?

A

80%

61
Q

What is a specific heat of water?

A

1

62
Q

What’s specific heat of steam and ice?

A

.5

63
Q

How do you calculate vaporization BTU?

A

Cylinder diameter x Cylinder height

64
Q

Excess flow valve permits what?

A

Flow of liquid or gas

65
Q

Max supports for horizontal propane tanks?

A

2 supports max

66
Q

How far do 1000 -2000 gal propane tanks have to be away from a building?

A

25ft

67
Q

How far apart to two propane tanks have to be from each other?

A

3ft (1m)

68
Q

Calculate pressure drop

A

Standing pressure - operating pressure

69
Q

What’s the max flex connector length for a gas range ?

A

6ft for unvented appliances
(gas range is unvented )

2ft for vented appliances

70
Q

How much pressure drop is allowed when pressure testing?

A

No pressure drop is allowed when testing.

71
Q

How do you install regulators ?

A

Vents pointing down

72
Q

What percentage of pressure drop is on a 2psi gas line ?

A

75%

Previous Test Questions (1 decks)

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