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Level 4 gas mock exam pt2

Total questions: 60

Worksheet time: 30mins

Name
Class
Date
1.

What is the normal unit of measurement used on a ‘U’ gauge for gas pressure?

a)

Pascal

b)

Bar

c)

Millibar

d)

Kilopascal

2.

What is the maximum permitted lock-up pressure for a low-pressure gas installation?

a)

21 mbar

b)

30 mbar

c)

37 mbar

d)

75 mbar

3.

Standing pressure is measured when:

a)

All appliances are operating

b)

One appliance is operating

c)

Gas is flowing through pipework

d)

All appliances are turned off

4.

Working pressure at the meter regulator should normally be between:

a)

14–18 mbar

b)

16–20 mbar

c)

18.5–23 mbar

d)

20–25 mbar

5.

What is the minimum accuracy required for a water gauge used for tightness testing?

a)

1.0 mbar

b)

0.5 mbar

c)

0.25 mbar

d)

0.1 mbar

6.

IGEM/UP/1B allows the use of electronic pressure gauges provided they are:

a)

Battery powered only

b)

Calibrated every 24 months

c)

Intrinsically safe and calibrated annually

d)

Used only at the meter

7.

A let-by test on a low-pressure installation is normally carried out at:

a)

20–21 mbar

b)

14–16 mbar

c)

7–10 mbar

d)

30 mbar

8.

During a let-by test, what rise in pressure indicates the ECV is letting by?

a)

Any rise

b)

More than 0.1 mbar

c)

More than 0.25 mbar

d)

More than 1 mbar

9.

How long should the gauge be observed during the let-by test?

a)

30 seconds

b)

1 minute

c)

2 minutes

d)

5 minutes

10.

The tightness test pressure for a low-pressure installation should be raised to:

a)

14–16 mbar

b)

18–19 mbar

c)

20–21 mbar

d)

25–30 mbar

11.

After stabilising the test pressure, readings are taken after:

a)

30 seconds

b)

1 minute

c)

2 minutes

d)

5 minutes

12.

If an installation fails a tightness test, the engineer must:

a)

Ignore minor drops

b)

Increase test pressure

c)

Trace and repair or isolate the escape

d)

Only inform the customer

13.

Which leak detection method is prohibited on gas installations?

a)

Proprietary LDF

b)

Electronic gas detector

c)

Soap solution

d)

Visual inspection

14.

Leak detection fluids containing ammonia must NOT be used on:

a)

Steel

b)

Stainless steel

c)

Copper or brass

d)

Polyethylene

15.

When must a tightness test be carried out?

a)

Only on new installations

b)

After any alteration to pipework

c)

Only if gas is smelt

d)

Only before commissioning

16.

What must always be completed before purging an installation?

a)

Visual inspection

b)

Appliance servicing

c)

Tightness test

d)

Gas rate check

17.

During purging, which action is NOT permitted?

a)

Opening windows

b)

Operating electrical switches

c)

Informing the customer

d)

Ventilating the area

18.

Purge pressure must not exceed:

a)

Standing pressure

b)

Lock-up pressure

c)

Maximum operating pressure

d)

Working pressure at appliance

19.

LPG requires ventilation at low level because it is:

a)

Lighter than air

b)

Heavier than air

c)

Toxic

d)

Pressurised

20.

Installation volume (IV) includes:

a)

Pipework only

b)

Meter volume only

c)

Pipework, meter, plus 10% fittings

d)

Appliances only

21.

The maximum allowable pressure loss between meter and appliance for natural gas is:

a)

0.5 mbar

b)

0.75 mbar

c)

1.0 mbar

d)

2.0 mbar

22.

Pipe sizing calculations must consider:

a)

Appliance colour

b)

Pipe material cost

c)

Length, fittings, and gas rate

d)

Meter type only

23.

Pressure loss is proportional to:

a)

Pipe diameter

b)

Appliance type

c)

Pipe length

d)

Meter size

24.

When gas enters or leaves the branch of a tee, the fitting:

a)

Is ignored

b)

Adds resistance

c)

Must be removed

d)

Doubles pressure loss

25.

Low pressure complaints may occur when meter outlet pressure is:

a)

Below 19 mbar

b)

Between 19–23 mbar

c)

Exactly 21 mbar

d)

Above 75 mbar

26.

Burner pressure determines:

a)

Pipe size

b)

Gas meter capacity

c)

Gas flow through the injector

d)

Flue size

27.

Burner pressure cannot normally be checked on modern boilers because they use:

a)

Mechanical regulators

b)

Air/gas ratio valves

c)

Fixed injectors

d)

Secondary meters

28.

Gas rate measurement confirms:

a)

Pressure only

b)

Correct injector size

c)

Actual gas consumption

d)

Ventilation adequacy

29.

Heat input is calculated using:

a)

Pressure × time

b)

Gas rate × calorific value

c)

Volume ÷ time

d)

Pressure ÷ volume

30.

Typical calorific value of natural gas is approximately:

a)

31 MJ/m³

b)

35 MJ/m³

c)

38.8 MJ/m³

d)

42 MJ/m³

31.

Compression joints are prohibited where joints are:

a)

Above ground

b)

Below ground

c)

Accessible

d)

Visible

32.

Which joint type cannot be dismantled once installed?

a)

Compression

b)

Soldered

c)

Press-fit

d)

Flanged

33.

Press-fit fittings are useful where:

a)

High pressure exists

b)

A naked flame is prohibited

c)

Pipework is buried

d)

Flexibility is required

34.

Polyethylene (PE) pipework may be used:

a)

Internally only

b)

Externally only

c)

Anywhere

d)

Only above ground

35.

Mild steel joints should use either:

a)

PTFE and compound together

b)

Hemp only

c)

Compound or PTFE

d)

Solder

36.

Domestic meters up to what capacity are covered by BS 6400 Part 1?

a)

4 m³/h

b)

6 m³/h

c)

10 m³/h

d)

16 m³/h

37.

Domestic gas meter installations are classed under DSEAR as:

a)

Zone 0

b)

Zone 1

c)

Zone 2

d)

Non-hazardous

38.

The emergency control valve (ECV) must be:

a)

Locked

b)

Accessible to the consumer

c)

Painted red

d)

Installed downstream of the meter

39.

Where a meter is more than 2 m from the ECV, what is required?

a)

Extra bonding

b)

Additional regulator

c)

Location label

d)

Ventilation grille

40.

Gas meters must not be installed:

a)

In garages

b)

In ventilated areas

c)

Under stairs forming sole escape route

d)

In meter boxes

41.

Which document defines ID and AR classifications?

a)

BS 6891

b)

IGEM/UP/1B

c)

IGEM/G/11

d)

GS(I&U)R

42.

An Immediately Dangerous (ID) situation means:

a)

Potential future danger

b)

Minor defect

c)

Immediate risk to life or property

d)

Appliance inefficient

43.

At Risk (AR) situations:

a)

Must be ignored

b)

Are immediately lethal

c)

May become dangerous if left

d)

Only apply to meters

44.

Which regulation governs reporting of gas incidents?

a)

DSEAR

b)

RIDDOR

c)

BS 6400

d)

IGEM/UP/1

45.

The first priority when dealing with a gas escape is to:

a)

Find the leak

b)

Complete paperwork

c)

Safeguard life

d)

Notify Gas Safe

46.

When dealing with a suspected gas escape, engineers must NOT:

a)

Turn off the gas

b)

Ventilate the area

c)

Operate electrical switches

d)

Extinguish naked flames

47.

The Gas Emergency Reporting Service number in the UK is:

a)

999

b)

112

c)

0800 111 999

d)

0800 999 111

48.

Buildings should be evacuated if gas levels exceed:

a)

5% LEL

b)

10% LEL

c)

15% LEL

d)

20% LEL

49.

After commissioning, engineers must ensure the customer:

a)

Signs paperwork only

b)

Understands appliance operation

c)

Services the appliance annually

d)

Adjusts burner pressure

50.

Which is NOT a minimum commissioning check?

a)

Tightness test

b)

Ventilation

c)

Appliance colour

d)

Gas rate

51.

Uncompleted gas work must be left:

a)

Clearly labelled

b)

Turned on

c)

Isolated and sealed

d)

Partially connected

52.

Temporary continuity bonding is required when:

a)

Painting pipework

b)

Disconnecting meters

c)

Checking gas rates

d)

Relighting appliances

53.

Gas pipe sleeves should normally be sealed:

a)

At both ends

b)

At neither end

c)

At one end only

d)

With expanding foam

54.

Pipework must not be installed:

a)

Under suspended floors

b)

Across joists

c)

In unventilated ducts

d)

Parallel to walls

55.

CSST must NOT be used as:

a)

Installation pipework

b)

Underground pipework

c)

Above-ground pipework

d)

Flexible connectors

56.

Pressure loss tables are found in the:

a)

Gas Safe Register

b)

Domestic Natural Gas Handbook

c)

Building Regulations

d)

Manufacturer’s manuals

57.

A gas rate check should be carried out when the appliance is:

a)

Cold

b)

On pilot only

c)

Operating at maximum input

d)

Switched off

58.

If an appliance cannot be commissioned, it must be:

a)

Left disconnected

b)

Capped and labelled

c)

Turned to low

d)

Isolated at appliance only

59.

Gas pipework inside buildings must be made from:

a)

Plastic

b)

Rubber

c)

Metallic materials

d)

PE

60.

Ultimately, responsibility for gas safety rests with the:

a)

Customer

b)

Manufacturer

c)

Gas engineer

d)

Gas supplier

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