MCQ quiz on Welding multiple choice questions and answers on Welding MCQ questions quiz on Welding objectives questions with answer test pdf.

Welding MCQ Questions and Answers Quiz

1. Which of the gases can be used to form a protective envelope in arc welding?

  1. Oxygen and Carbon dioxide
  2. Oxygen and Carbon dioxide
  3. Hydrogen and Helium
  4. Hydrogen and Helium
  5. Oxygen and Helium
  6. Oxygen and Helium
  7. Helium and Carbon dioxide
  8. Helium and Carbon dioxide

2. Acetylene is a fuel gas for gas cutting & welding composed of

  1. 7.7 of carbon & 92.3 % of hydrogen
  2. 7.7 of carbon & 92.3 % of hydrogen
  3. 92.3% carbon & 7.7 % hydrogen
  4. 92.3% carbon & 7.7 % hydrogen
  5. 100% carbon
  6. 100% carbon
  7. 50% carbon & 50% hydrogrn
  8. 50% carbon & 50% hydrogrn

3. Acetylene is a fuel gas for gas cutting & welding composed of

  1. 7.7 of carbon & 92.3 % of hydrogen
  2. 7.7 of carbon & 92.3 % of hydrogen
  3. 92.3% carbon & 7.7 % hydrogen
  4. 92.3% carbon & 7.7 % hydrogen
  5. 100% carbon
  6. 100% carbon
  7. 50% carbon & 50% hydrogrn
  8. 50% carbon & 50% hydrogrn

4. Which of the gases can be used to form a protective envelope in arc welding?

  1. Oxygen and Carbon dioxide
  2. Oxygen and Carbon dioxide
  3. Hydrogen and Helium
  4. Hydrogen and Helium
  5. Oxygen and Helium
  6. Oxygen and Helium
  7. Helium and Carbon dioxide
  8. Helium and Carbon dioxide

5. The electrodes are manufactured in two standard lengths namely

  1. 350 mm and 250 mm
  2. 350 mm and 450 mm
  3. 400 mm and 500 mm
  4. 12"and 10"

6. Which fuel gas is used for cutting deep under water?

  1. Acetylene
  2. Hydrogen
  3. LPG
  4. Methane

7. While gas cutting the nozzle should

  1. almost touch the work
  2. be 10 mm away from work
  3. be 2 mm away from work
  4. be 5 mm away from work

8. If the blowpipe is moved to and fro frequently while cutting the kerf will

  1. be more
  2. of correct size
  3. be less
  4. not be affected

9. The electrode size refers to

  1. diameter of its core wire
  2. diameter (overall) of electrode
  3. thickness of flux coating
  4. length of electrode

10. The top edge is melted round and the cut face is not smooth in gas cutting. This is due to

  1. extremely slow cutting speed
  2. insufficient acetylene pressure
  3. the tip being held too high
  4. too much cutting oxygen pressure
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MCQ Multiple Choice Questions and Answers on Welding

Welding Question and Answer