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Gas Exam Prep > Exam Prep > Flashcards

Exam Prep Flashcards

1
Q

More k factor

A

More flow

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2
Q

Universal orifice

A

Propane and gas

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3
Q

Products of combustion

A

Co2 h2o heat

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4
Q

Perfect combustion
Complete combustion
Total combustion

A

Perfect: 1cuft ch4 10ft air
Complete: 1 cuft ch4 15 ft air
Total: 1 cuft ch4 30 ft air

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5
Q

Venturi definition

A

Low pressure high velocity

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6
Q

3 main categories of shut off valves

A

Needle ball plug

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7
Q

100% shut off 80% shutoff

A

80% shutoff has pilot on

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8
Q

Opening mechanism of solenoid gas valve

A

Electromagnetic

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9
Q

Opening mechanism diaphragm valve

A

Gas pressure

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10
Q

Combination gas valve

A

Pilot safety assembly
Appliance safety regulator
Gas valve

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11
Q

Redundant gas valve

A

100% safe

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12
Q

Gas water heater valve operation

A

As the copper expands it closes valve looks like a penis

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13
Q

What operates seismic valve

A

Shuts off gas w movement manual reset

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14
Q

Emergency fuel shutoff

A

Cable akutated

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15
Q

3 types of elements in gas regs

A

Loading
Measuring
Restrictive

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16
Q

Force used to lockup service regulator

A

Lever

17
Q

What gas needs 2 stage regulator

A

Propane

18
Q

Integral twin reg is used

A

Piping distances 30 ft or less

19
Q

Expansion ratio
Propane
Natural gas
Water

A

C3h8 1:270
Ch4 1:600
Water 1:1700

20
Q

Set point

A

Desired downstream pressure

21
Q

Lockup

A

The pressure above setpoint that is needed to shut off tight

22
Q

Droop

A

Downstream pressure drop below setpoint

Gas Exam Prep (4 decks)

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