Exam Prep

Question 1

More k factor

Answer 1

More flow

Question 2

Universal orifice

Answer 2

Propane and gas

Question 3

Products of combustion

Answer 3

Co2 h2o heat

Question 4

Perfect combustion
Complete combustion
Total combustion

Answer 4

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

Question 5

Venturi definition

Answer 5

Low pressure high velocity

Question 6

3 main categories of shut off valves

Answer 6

Needle ball plug

Question 7

100% shut off 80% shutoff

Answer 7

80% shutoff has pilot on

Question 8

Opening mechanism of solenoid gas valve

Answer 8

Electromagnetic

Question 9

Opening mechanism diaphragm valve

Answer 9

Gas pressure

Question 10

Combination gas valve

Answer 10

Pilot safety assembly
Appliance safety regulator
Gas valve

Question 11

Redundant gas valve

Answer 11

100% safe

Question 12

Gas water heater valve operation

Answer 12

As the copper expands it closes valve looks like a penis

Question 13

What operates seismic valve

Answer 13

Shuts off gas w movement manual reset

Question 14

Emergency fuel shutoff

Answer 14

Cable akutated

Question 15

3 types of elements in gas regs

Answer 15

Loading
Measuring
Restrictive

Question 16

Force used to lockup service regulator

Answer 16

Lever

Question 17

What gas needs 2 stage regulator

Answer 17

Propane

Question 18

Integral twin reg is used

Answer 18

Piping distances 30 ft or less

Question 19

Expansion ratio
Propane
Natural gas
Water

Answer 19

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

Question 20

Set point

Answer 20

Desired downstream pressure

Question 21

Lockup

Answer 21

The pressure above setpoint that is needed to shut off tight

Question 22

Droop

Answer 22

Downstream pressure drop below setpoint