Sri Lanka NVQ Level 3 Welder Written Examination Practice Questions - Sri Lanka NVQ Level 3 Welder Written Examination (TVEC DTET) Exam - Sri Lanka NVQ Level 3 Welder Written Examination Practice Questions - Sri Lanka NVQ Level 3 Welder Written Examination (TVEC DTET) Exam

Question 1

What 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?

Shade 5 Shade 8 Shade 10 Shade 14

Correct Answer:

Shade 10

Question 2

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

Polyester-cotton blend Chrome-tanned split leather Nylon utility fabric Rubber-coated canvas

Correct Answer:

Chrome-tanned split leather

Question 3

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

Synthetic fabric mesh panels for ventilation Metal eyelets with exposed nylon laces Leather construction with lace covers or slip-on design Thick rubber soles with steel shanks and open heels

Correct Answer:

Leather construction with lace covers or slip-on design

Question 4

What 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?

The pipe will act as a capacitor and store dangerous high-voltage electrical charge. It can cause stray currents to damage pipe joints, create electric shock hazards elsewhere, or start a fire. The welding machine's rectifier will instantly burn out due to reverse polarity. It causes the welding arc to become extremely cold and unstable.

Correct Answer:

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

Question 5

Under 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?

12 to 24 Volts DC, which is sufficient to penetrate dry human skin. 50 to 80 Volts AC or DC, which can overcome human body resistance, especially in wet or humid conditions. 220 to 400 Volts AC, which is the input voltage of the primary transformer coils. 1000 to 2000 Volts AC, which is required to ionize the air to strike the arc.

Correct Answer:

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

Exam overview

About this Exam

Prepare with the Sri Lanka NVQ Level 3 Welder Written Examination Practice Questions - Sri Lanka NVQ Level 3 Welder Written Examination (TVEC DTET) Exam practice quiz. This question bank includes 100 questions covering welding, electrode, metal, current, and joint. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Sri Lanka NVQ Level 3 Welder Written Examination Practice Questions - Sri Lanka NVQ Level 3 Welder Written Examination (TVEC DTET) Exam

This practice set contains 100 questions from the matching question bank and focuses on welding, electrode, metal, current, and joint. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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Sri Lanka NVQ Level 3 Welder Written Examination Practice Questions - Sri Lanka NVQ Level 3 Welder Written Examination (TVEC DTET) Exam

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