Free ACS Gas Practice Questions by Subject

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CCN1

Core Domestic Natural Gas

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Gas Safety Legislation

Legislation that underpins safe gas work — duties, competence and key statutory requirements.

Gas Safety Regulations

Gas Safety (Installation and Use) Regulations and related obligations for domestic work.

Gas Emergency Actions and Procedures

Emergency actions, isolation and procedures when gas escapes or unsafe situations arise.

Gas Controls and Safety Devices

Controls, valves and safety devices used on domestic gas installations and appliances.

Combustion Performance Analysis

Combustion, flue-gas analysis and performance checks against current criteria.

Ventilation Standards

Ventilation requirements for rooms, compartments and open-flued appliances.

Flue and Chimney Standards

Flues, chimneys and termination — types, testing and unsafe situations.

Gas Pipe Sizing

Pipe sizing methods for domestic natural-gas supplies and appliance feeds.

Gas Pressures

Operating pressures, standing/working checks and pressure-related faults.

Gas Rates and Heat Input

Gas rates, heat input and appliance rating checks.

Gas Tightness testing

Tightness testing and purging for domestic pipework and meter installations.

Commission & Re-Establish Gas Supplies

Commissioning and safely re-establishing gas supplies after work.

Domestic

Appliance competencies — CENWAT, CKR1, HTR1, MET1, CPA1

CENWAT - Water Heaters & Boilers

Domestic central-heating boilers and water heaters — installation, flues, controls and commissioning.

CKR1 - Domestic Cookers

Domestic cooking appliances — siting, clearances, burners, controls and unsafe situations.

HTR1 - Gas Fires and Wall Heaters

Domestic gas fires and wall heaters — chimneys, flue-flow, spillage testing and ventilation.

MET1 - Gas Meter Installation

Domestic natural-gas meters — location, installation, exchange, tightness testing and recommissioning.

CPA1 - Combustion Performance Analysis

Appliance combustion performance analysis — readings, interpretation and unsafe situations.

What You Get with Full Access

17 Subject Areas

Revision across CCN1 and domestic appliance competencies, broken down into focused study topics

Flash Cards

Interactive flip cards for quick revision

Mock Exams

Full exam simulations under timed conditions

Progress Tracking

Monitor your scores and improvement over time

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