Quiz Prep Prin. & prop. of fuel gases

Question 1

L.P stands for what?

Answer 1

Liquified Petroleum

Question 2

Define Cu. Ft.

Answer 2

the amount of gas that would occupy 1 cu. ft. at 60F, saturated with water vapor and under 30” w.c pressure

Question 3

additional gas added to a full container increases what?

Answer 3

Pressure and temperature due to compression

Question 4

what is atmospheric pressure?

Answer 4

14.7 psia at sea level

Question 5

gauge pressure is measured in what?

Answer 5

pounds per square inch

Question 6

what is the measurement of w.c used for?

Answer 6

measuring small pressure above or below atmospheric

Question 7

device that is used to measure w.c

Answer 7

manometer

Question 8

1 psi = how many inches of w.c

Answer 8

28” w.c

Question 9

if a gases temperature is increased what must happen?

Answer 9

the pressure or volume must increase proportionally

Question 10

serving gas suppliers service line pressure is what?

Answer 10

anywhere between 8” w.c and 60 psi

Question 11

most natural gas appliances want a min of ___ pressure going to the gas valve for proper operation and manifold pressure

Answer 11

5” w.c

Question 12

common natural gas manifold pressure is

Answer 12

3.5” w.c

Question 13

first stage regulator inlet

Answer 13

same as tank pressure

Question 14

first stage regulator outlet pressure

Answer 14

10 psi

Question 15

second stage regulator inlet pressure

Answer 15

10 psi

Question 16

second stage regulator outlet pressure

Answer 16

11 - 14” w.c

Question 17

common propane manifold pressure

Answer 17

10” w.c

Question 18

always refer to what for proper inlet to gas valve and proper manifold pressures

Answer 18

I & O installation and operations manual

Question 19

a concentration of gas lower than its L.E.L means what

Answer 19

its too lean there is not enough fuel for combustion

Question 20

what is L.E.L

Answer 20

lower explosive limit

Question 21

a concentration of gas higherr than its L.E.L means what

Answer 21

it is too rich there is not enough oxygen for the present fuel

Question 22

specific gravity

Answer 22

ratio of weight of a given volume (gas) compared to the same volume of air

Question 23

specific gravity greater than 1 will what?

Answer 23

settle and accumulate

Question 24

specific gravity less than 1 will what?

Answer 24

rise and dissipate

Question 25

air’s specific gravity

Answer 25

1

Question 26

natural gas’s specific gravity

Answer 26

.65

Question 27

Propane’s specific gravity is

Answer 27

1.52

Question 28

heating value of natural gas

Answer 28

1,000 btu’s per cu. ft.

Question 29

heating value of propane

Answer 29

2,500 btu’sper cu. ft.