100+ Free Sri Lanka NVQ Level 3 Welder Written Examination Practice Questions

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Key Facts: Sri Lanka NVQ Level 3 Welder Written Examination Exam

50%

Passing Score

TVEC Exam Guidelines

2 hours

Exam Time

DTET Course Outlines

35%

SMAW/MMAW Weight

TVEC Welder Syllabus

6 months

Typical Course Duration

DTET Course Catalog

LKR 1.5k-5k

Assessment Fee Range

TVEC Centers

This practice bank is designed to prepare candidates for the Sri Lanka NVQ Level 3 Welder written examination administered by TVEC and DTET. It covers safety & workshop practices (15%), joint preparation & materials (15%), MMAW/SMAW (35%), GMAW/GTAW (15%), oxy-fuel cutting & welding (10%), and metallurgy, testing, and weld defects (10%). The theoretical assessment is a key component of the competency-based certification framework.

Sample Sri Lanka NVQ Level 3 Welder Written Examination Practice Questions

Try these sample questions to test your Sri Lanka NVQ Level 3 Welder Written Examination exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is the recommended minimum filter lens shade number for Shielded Metal Arc Welding (SMAW/MMAW) when using an arc current of 100 to 150 Amperes?

A.Shade 5

B.Shade 8

C.Shade 10

D.Shade 14

Explanation: According to standard welding safety guidelines (ANSI Z49.1 / AWS), Shade 8 is the minimum and Shade 10 is the recommended (comfort) filter lens for Shielded Metal Arc Welding (SMAW) at arc currents of roughly 60–160 Amperes, which covers the 100–150 Amp range. Shade 5 is too light and is typically used for oxy-fuel gas cutting or light brazing. Shade 14 is reserved for high-current applications exceeding about 400–500 Amperes.

2Which of the following materials is most suitable for welding aprons and gloves due to its excellent resistance to heat and sparks?

A.Polyester-cotton blend

B.Chrome-tanned split leather

C.Nylon utility fabric

D.Rubber-coated canvas

Explanation: Chrome-tanned split leather is the industry standard material for welding aprons, jackets, and gloves because it provides superior thermal insulation and resistance to hot spatter and sparks. Synthetic fibers like nylon and polyester-cotton blends melt when exposed to high temperatures, causing severe skin burns. Rubber-coated canvas is highly flammable and unsuitable for heavy thermal operations.

3What feature is essential for safety boots worn in a welding workshop to prevent hot spatter from trapping on the foot?

A.Synthetic fabric mesh panels for ventilation

B.Metal eyelets with exposed nylon laces

C.Leather construction with lace covers or slip-on design

D.Thick rubber soles with steel shanks and open heels

Explanation: Welding safety boots must be made of sturdy leather and should either be a slip-on design (like Chelsea or rigger boots) or have leather lace covers (spats) to prevent hot sparks or molten metal from falling into the laces and burning through. Exposed nylon laces or synthetic mesh panels can easily melt or catch fire when hit by hot spatter. Open heels are extremely dangerous as sparks can easily reach the rear of the foot.

4What is the primary hazard of attaching a welding machine's work clamp (ground clamp) to a building's water pipe instead of directly to the workpiece or welding table?

A.The pipe will act as a capacitor and store dangerous high-voltage electrical charge.

B.It can cause stray currents to damage pipe joints, create electric shock hazards elsewhere, or start a fire.

C.The welding machine's rectifier will instantly burn out due to reverse polarity.

D.It causes the welding arc to become extremely cold and unstable.

Explanation: Attaching the work clamp to a building pipe or structural steel far from the weld zone allows current to flow through paths not designed for high electrical current. This stray current can cause electrical arcing at joints, damage plumbing fixtures, heat up pipes to start fires, and create dangerous touch voltages on piping throughout the building. The work clamp should always be connected as close to the welding joint as possible.

5Under TVEC guidelines, what is the maximum open-circuit voltage (OCV) range typically permitted on standard Manual Metal Arc Welding (MMAW) power sources, and why does this present a shock hazard?

A.12 to 24 Volts DC, which is sufficient to penetrate dry human skin.

B.50 to 80 Volts AC or DC, which can overcome human body resistance, especially in wet or humid conditions.

C.220 to 400 Volts AC, which is the input voltage of the primary transformer coils.

D.1000 to 2000 Volts AC, which is required to ionize the air to strike the arc.

Explanation: The open-circuit voltage (OCV) of a MMAW/SMAW machine is the voltage between the electrode holder and the work clamp when the machine is turned on but welding is not active. This voltage typically ranges from 50V to 80V. Although it is lower than the mains supply, it is high enough to deliver a fatal electric shock, particularly in wet environments or if the welder is sweaty and makes direct contact with live parts.

6For a local exhaust ventilation (LEV) hood to be effective in capturing welding fumes, what is the recommended positioning relative to the welding arc?

A.Directly behind the welder's head to draw fumes past their face

B.At least 1 to 2 meters directly above the welding arc

C.Within 10 to 12 inches (25 to 30 cm) of the welding arc, positioned to pull fumes away from the welder's breathing zone

D.On the workshop floor to capture heavy metal particles as they fall

Explanation: Local exhaust ventilation (LEV) must capture fumes before they enter the welder's breathing zone. For optimal capture velocity, the intake hood or nozzle must be placed close to the welding arc, typically within 10 to 12 inches (25 to 30 cm), and positioned to draw the plume sideways or away from the welder's face. Placing it above the arc or behind the welder is ineffective or actually pulls fumes through their breathing zone.

7When welding galvanized steel, what specific toxic substance is released into the air, and what occupational illness does it cause?

A.Iron oxide fumes, causing siderosis

B.Zinc oxide fumes, causing metal fume fever

C.Lead fumes, causing plumbism

D.Copper fumes, causing Wilson's disease

Explanation: Galvanized steel is coated with a layer of zinc to prevent corrosion. During welding, this zinc layer vaporizes and oxidizes in the air, creating fine zinc oxide fumes. Inhaling these fumes causes an acute, flu-like condition called metal fume fever (often referred to as 'galvy poisoning' or 'foundry shivers'). Proper ventilation or respirator use is mandatory when welding or cutting galvanized materials.

8In a welding workshop, a fire starts when sparks ignite oily rags. What class of fire is this, and which type of fire extinguisher is most appropriate?

A.Class D fire; use a sodium chloride dry powder extinguisher.

B.Class A and B fire; use an ABC dry chemical or foam fire extinguisher.

C.Class C fire; use a water-based fire extinguisher.

D.Class F fire; use a wet chemical extinguisher.

Explanation: Oily rags involve ordinary combustibles (Class A) and flammable liquids/oils (Class B). An ABC-rated dry chemical extinguisher is the standard choice for workshops because it is effective on Class A, B, and C (electrical) fires. Water-based extinguishers must never be used on Class B or electrical fires due to the risk of spreading the burning oil or conducting electricity.

9According to safety standards adopted in TVEC training, how long must a designated fire watch continue after hot work or welding operations have ceased?

A.At least 10 minutes

B.At least 30 minutes

C.Exactly 2 hours

D.Until the welded metal is cool enough to touch with a bare hand

Explanation: A fire watch is required to remain in the hot work area for at least 30 minutes after all welding and cutting operations are completed. This duration is critical because sparks and slag can smolder undetected in floor cracks, walls, or insulation, eventually igniting a flame long after the welder has left the area.

10How should oxygen cylinders and flammable fuel gas (such as acetylene) cylinders be stored when they are not in use?

A.Laid horizontally on wooden racks, stacked no more than three high

B.Upright, secured with chains, and separated by a minimum distance of 20 feet (6 meters) or by a 5-foot, 1/2-hour fire-resistant barrier

C.Together in a tightly sealed, non-ventilated metal container to prevent gas escape

D.Stored inside the welding booth for quick access during shifts

Explanation: To prevent catastrophic explosions, compressed gas cylinders must be stored upright and chained to prevent falling. Oxygen cylinders must be stored away from fuel gas cylinders (such as acetylene) by at least 20 feet (6 meters) or separated by a non-combustible barrier at least 5 feet (1.5 meters) high with a fire-resistance rating of at least one-half hour. This prevents an incident on one cylinder from immediately involving the other.

About the Sri Lanka NVQ Level 3 Welder Written Examination Exam

The Sri Lanka National Vocational Qualification (NVQ) Level 3 Welder theory examination assesses a candidate's core understanding of welding safety, workshop practices, materials, joint preparation, cutting, manual metal arc welding (MMAW/SMAW), gas metal arc welding (GMAW), gas tungsten arc welding (GTAW), welding metallurgy, testing, and defects. Passing this assessment, along with the practical test, grants the nationally recognized NVQ Level 3 Welder credential.

Assessment

Written theory paper consisting of multiple-choice questions (MCQs) and short structured questions.

Time Limit

2 hours

Passing Score

50%

Exam Fee

LKR 1,500 - LKR 5,000 (Tertiary and Vocational Education Commission (TVEC))

Sri Lanka NVQ Level 3 Welder Written Examination Exam Content Outline

15%

Welding Safety and Workshop Practices

PPE requirements, protective clothing, electrical hazard mitigation, local and general exhaust ventilation, fire classifications/suppression, and storage/handling of compressed gas cylinders.

15%

Material and Joint Preparation

Methods of cleaning ferrous and non-ferrous metals, layouts using scribes and soapstone, joint geometries (grooves, fillets), bevel calculations, root face and opening fit-ups, and tack welding.

35%

Manual Metal Arc Welding (MMAW/SMAW)

SMAW transformer/rectifier characteristics, duty cycle limits, AWS classifications (E6013, E7018, E6010), low-hydrogen oven controls, polarity selections (AC/DCEP/DCEN), electrode diameter amperage calculations, arc settings, and slag removal.

15%

Gas Metal Arc Welding (GMAW/MIG)

GMAW wire feeders, constant voltage limits, ER70S-6 wire size selections, shielding gases (pure carbon dioxide, argon/CO2 blends), metal transfer techniques (short-circuit, spray), gas flow regulators, and nozzle troubleshooting.

10%

Oxy-Fuel Gas Cutting & Oxy-Acetylene Welding

Compressed oxygen and acetylene pressure adjustments, regulator functions, neutral/oxidizing/carburizing flame adjustments, hose color-coding and left/right-hand thread styles, flashback preventers, and sequence procedures.

10%

Welding Metallurgy, Testing & Weld Defects

Steel carbon ratings and weldability, heat treatment thermal effects, common weld defects (porosity, undercut, lack of fusion, cracking), visual weld gauges, and non-destructive testing (dye penetrant, magnetic particle, radiographic).

How to Pass the Sri Lanka NVQ Level 3 Welder Written Examination Exam

What You Need to Know

Passing score: 50%
Assessment: Written theory paper consisting of multiple-choice questions (MCQs) and short structured questions.
Time limit: 2 hours
Exam fee: LKR 1,500 - LKR 5,000

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

Sri Lanka NVQ Level 3 Welder Written Examination Study Tips from Top Performers

1Review the standard AWS electrode classifications, especially the differences in welding position and flux coating for E6010, E6013, and E7018.

2Understand standard safety rules: oxygen cylinders contain high pressure and should never be lubricated with grease or oil.

3Pay attention to oxy-fuel gas hoses: acetylene is always red with left-hand threads, and oxygen is green or blue with right-hand threads.

4Learn the causes and remedies of common defects, particularly undercut (caused by excessive current or incorrect electrode angle) and porosity (caused by lack of shielding gas or dirty metal).

5Review polarity applications: Direct Current Electrode Positive (DCEP) yields deeper penetration in SMAW, while Direct Current Electrode Negative (DCEN) has a higher deposition rate.

Frequently Asked Questions

What is the format of the NVQ Level 3 Welder theory exam?

The written theory exam typically consists of multiple-choice questions (MCQs) and short-answer structured questions focusing on practical welding principles, safety, and equipment settings.

What is the passing score for the TVEC Welder Level 3 written exam?

The minimum passing score for the written theory assessment is generally 50%.

Is there a practical component to the NVQ Level 3 Welder assessment?

Yes. NVQ is a competency-based qualification. Candidates must pass both the practical workshop test (welding joint coupons to standard specifications) and the written theory assessment to earn the credential.

How can I register for the Sri Lanka NVQ Welder examination?

You can register through TVEC-licensed centers, such as DTET technical colleges, NAITA, or the Vocational Training Authority (VTA) centers across Sri Lanka.

Can I obtain the NVQ Level 3 certification without attending a 6-month course?

Yes, experienced welders with several years of industrial experience can sit for the assessment directly through the Recognition of Prior Learning (RPL) pathway.