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100+ Free COREN Craftsman Practice Questions
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2026 Statistics
Key Facts: COREN Craftsman Exam
50%
Minimum passing score required in each section of the COREN exam
COREN Guidelines for Professional Examination
NGN 38,000
Total application, processing, exam, and registration fee for Craftsmen
COREN Official Schedule of Fees
4 Cadres
Engineering cadres regulated: Engineer, Technologist, Technician, Craftsman
Decree 55 of 1970 / Amendment Act 2018
2 years
Minimum post-qualification practical experience required to apply
COREN Personnel Registration Requirements
1970
Year COREN was established under Decree No. 55
Engineers (Registration, etc.) Act
The COREN Registered Engineering Craftsman written examination covers workshop safety, mechanical tools, machine operations, welding and fabrication, basic electrical wiring, precision measurement, and regulatory frameworks (Decree 55 of 1970 and the COREN 2018 amendment). A minimum of 50% in each section is required to pass, followed by an oral interview.
Sample COREN Craftsman Practice Questions
Try these sample questions to test your COREN Craftsman exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Which type of fire extinguisher is most appropriate for a Class A fire involving materials like wood, paper, and textiles in an engineering workshop?
A.Water-based or dry powder extinguisher
B.Carbon dioxide (CO2) extinguisher only
C.Wet chemical extinguisher only
D.Metal fire powder (Class D powder) only
Explanation: Class A fires involve ordinary combustible solids like wood, paper, and clothing. Water-based extinguishers cool the fuel and extinguish the flame, while multipurpose dry powder is also suitable, making them the most appropriate choices.
2In the event of a Class B fire involving petrol, diesel, or lubricating oils in a machine shop, which substance must NEVER be used to extinguish it?
A.Foam
B.Carbon Dioxide (CO2)
C.Water
D.Dry Powder
Explanation: Water must never be used on Class B flammable liquid fires because it is denser than the liquid and will cause the burning fuel to splash, spread, and intensify the fire rapidly.
3What is the recommended first step when dealing with a Class C gas fire, such as a leaking acetylene or butane hose, in a welding bay?
A.Discharge a water extinguisher directly on the flame
B.Isolate and turn off the gas supply source immediately
C.Smother the flame using a damp canvas fire blanket
D.Cool the surrounding cylinders with CO2 before extinguishing
Explanation: For Class C gas fires, the priority is to isolate and shut off the gas supply first. Extinguishing the flame before stopping the gas flow creates a dangerous risk of gas accumulation, which can cause a catastrophic explosion.
4Which extinguishing agent is specifically formulated to combat a Class D fire involving combustible metals like magnesium chips or sodium in a machine shop?
A.Halon gas cleaner
B.LITH-EX or specialized dry powder (NaCl/graphite base)
C.Water mist spray
D.High-expansion chemical foam
Explanation: Class D fires involve combustible metals which react violently with water, foam, and CO2. Specialized dry powders (like copper, graphite, or sodium chloride based powders) or LITH-EX are required to smother the metal without causing explosive reactions.
5When extinguishing a fire in an electrical control panel that is still energized, which extinguisher type must be used to prevent electrical shock to the operator?
A.Wet chemical or foam extinguisher
B.Water fire bucket
C.Carbon dioxide (CO2) or dry powder extinguisher
D.Soda-acid pressure extinguisher
Explanation: CO2 and dry powder are non-conductive extinguishing agents. Water, foam, and soda-acid extinguishers contain conductive liquids that present a severe electrocution hazard to the person operating the extinguisher.
6If a workshop assistant sustains a chemical burn from battery acid or pickling solution on their arm, what is the correct immediate first-aid action?
A.Apply engine oil or grease to soothe the skin
B.Neutralize the acid by pouring concentrated alkaline soap directly on it
C.Flush the affected area with clean running water for at least 20 minutes
D.Wrap the arm tightly in dry cotton bandages without washing
Explanation: Immediate, continuous flushing with clean running water for a minimum of 20 minutes is critical to dilute and wash away the corrosive chemical. Neutralizing agents or oils must never be applied as they can cause exothermic heat reactions or trap the chemical.
7You find a colleague lying unconscious and still in contact with a live electrical conduit in the workshop. What should you do first?
A.Pull the victim away immediately using your bare hands to save time
B.Safely switch off the main electrical power source or isolate the victim using a non-conductive object
C.Pour a bucket of water on the victim to wake them up
D.Begin cardiopulmonary resuscitation (CPR) immediately while they are on the wire
Explanation: Safety is paramount; you must first isolate the electrical path to avoid becoming a victim yourself. Turn off the main breaker or push the victim away using a dry wooden stick, PVC pipe, or dry rubber mat before administering first aid.
8According to the safety regulations of the Nigerian Factory Act, what is the primary duty of an employer regarding Personal Protective Equipment (PPE)?
A.To sell the required safety gear to the workers at a subsidized rate
B.To provide suitable PPE to employees free of charge and ensure its proper maintenance
C.To instruct employees to purchase their own PPE from approved local hardware stores
D.To inspect and fine employees who choose to work without safety boots
Explanation: Under industrial safety laws in Nigeria (the Factory Act), employers are legally mandated to supply workers with appropriate protective clothing and equipment (such as helmets, goggles, safety boots) at no cost to the employee, and maintain them in good repair.
9What are the standard color codes for oxygen and acetylene cylinders used in gas welding workshops under Nigerian and international safety practices?
A.Oxygen is Red; Acetylene is Blue
B.Oxygen is Black; Acetylene is Maroon
C.Oxygen is Yellow; Acetylene is Green
D.Oxygen is Maroon; Acetylene is Black
Explanation: Standard industrial safety standards (ISO/British standards followed in Nigeria) mandate that Oxygen cylinders be painted Black (or blue/grey with white shoulders under newer standards) and Acetylene cylinders be painted Maroon (or red) to prevent dangerous gas mix-ups.
10What is the primary function of a flashback arrestor installed on a gas welding or cutting blowpipe setup?
A.To regulate and reduce the pressure of the gas flowing to the torch
B.To prevent a backfire flame from traveling back past the regulator into the gas cylinder and causing an explosion
C.To filter out moisture and dust particles from the oxygen line
D.To automatically mix the oxygen and acetylene in the correct ratio
Explanation: A flashback arrestor is a safety device containing a flame barrier and a check valve. It stops a reverse flow of gas and extinguishes a flame traveling back up the hose before it reaches the regulator and cylinder, preventing a catastrophic explosion.
About the COREN Craftsman Practice Questions
Verified exam format metadata for COREN Registered Engineering Craftsman Examination is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.