ACS examination prep

Question 1

How do you convert Gross Kw into Net Kw?

Answer 1

Heat input (Kw gross)/ 1.11

Question 2

How do you convert from heat input into flow rate (m3/h)?

Answer 2

(Heat input (kw) x 3.6)/38.9

Question 3

What is RIDDOR reportable as a gas engineer?

Answer 3

Anything classed as immediately dangerous

Question 4

When did the Gas safe register become the official governing body?

Answer 4

1 April 2009

Question 5

What is GSIUR 1998?

Answer 5

Gas safety installation and usage regulations

Question 6

What are the Gas safety (management) regulations? (A to D)

Answer 6

A- Safe management of Gas flow through a network supplying domestic consumers
B- Arrangements for dealing with supply emergencies
C- Arrangements for dealing with gas escapes and incidents
D- Composition of Gas

Question 7

Who has right of entry according to Gas safety regulations?

Answer 7

Gas transporter

Question 8

What is the process for RIDDOR reporting?

Answer 8

Notify the HSE and fill in online form within 14 days

Question 9

What is the installation volume made up of?

Answer 9

IV of meter + IV of pipework + IV of fittings

Question 10

How do you calculate Purge volume?

Answer 10

1.5 x Installation volume

Question 11

What is the maximum installation volume allowed?

Answer 11

0.035 m3

Question 12

What is the maximum operating pressure on the outlet of the meter?

Answer 12

21 +/-2 mbar

Question 13

What is the maximum incoming mains gas pressure on the inlet to the meter?

Answer 13

2 bar

Question 14

What are the pressures for intermediate gas mains?

Answer 14

2-7 Bar

Question 15

What are the pressures for Medium gas mains?

Answer 15

75mbar- 2 Bar

Question 16

What are the pressures for Low pressure gas mains?

Answer 16

Around 30mbar- 75mbar

Question 17

What is the equation for complete combustion?

Answer 17

CH4 + 2(O2)+ignition = CO2 + (2H20) + heat

Question 18

What percentage of Natural gas is Methane?

Answer 18

90%

Question 19

What are the explosive limits for natural gas?

Answer 19

15% to 5%

Question 20

What does a Post aerated flame look like?

Answer 20

Orange floppy flame

Question 21

What does a Pre-aerated flame look like?

Answer 21

Sharp purple flame

Question 22

What is flame impingement?

Answer 22

When flames impinge each other on a burner and the shape is changed

Question 23

What is flame chilling?

Answer 23

When a flame makes contact with an object which reduces it’s temperature

Question 24

What is vitiation?

Answer 24

Lack of oxygen

Question 25

What is linting?

Answer 25

Pre-aerated burner is blocked by dust

Question 26

What does F.A.G.S stand for?

Answer 26

Flue Air Gas Safety

Question 27

What is the calorific value of natural gas?

Answer 27

39 Mj/m3

Question 28

How much CO2 in the air means it can't support efficient combustion?

Answer 28

1.5-2%

Question 29

How much CO2 is in the air?

Answer 29

400ppm

Question 30

How much CO is in the air?

Answer 30

109,000ppm

Question 31

What are the two types of burners?

Answer 31

Naturally aspirated and forced draught mechanical means)

Question 32

At what mbar will the gas meter lock out?

Answer 32

23 mbar

Question 33

What is the minimum depth of screed?

Answer 33

75mm

Question 34

An electronic token meter with a tamper device that has activated will?

Answer 34

Will stop gas from flowing to the outlet pipework