Welding MCQ Questions and Answers Quiz

11. Which type of fire extinguisher is used in a welding shop?

  1. Foam type extinguisher
  2. Dry powder extinguisher
  3. CO2 extinguisher
  4. Halon extinguisher

12. If a worker has suffered from electric shock, he should be

  1. given an alcoholic drink
  2. given a cold drink
  3. made to walk
  4. kept warm and covered

13. The arc utilized in electric arc welding is a

  1. High voltage, high current discharge
  2. Low voltage, low current discharge
  3. Low voltage, high current discharge
  4. High voltage, low current discharge

14. The size of a welding machine is determined by

  1. Input amperage
  2. Output amperage
  3. Open circuit voltage
  4. Closed circuit voltage

15. If L (mm) is the length of the inner cone of the flame, the tip-to-metal distance should be

  1. L mm
  2. L + 2 mm
  3. L + 4 mm
  4. L + 6 mm

16. In a gas cut plate, the cut is high quality although there is some surface roughness caused by vertical drag lines. This is due to

  1. less preheating flame
  2. impure cutting oxygen
  3. too slow cutting speed
  4. smaller size cutting nozzle

17. The welding machine, which is used to convert AC welding supply to DC welding supply is

  1. Motor generator set
  2. Engine generator set
  3. Rectifier set
  4. Welding transformer

18. The correct flame for preheating before cutting is

  1. oxidizing flame
  2. neutral flame
  3. carburising flame
  4. slightly carburizing flame

19. Neutral flame in gas welding contains

  1. oxygen & Actylene in equal proportion
  2. More oxygen than Acetylene
  3. less oxygen than Acetylene
  4. None of the above

20. In DC welding heat distribution is possible between electrode and the base metal due to the change of polarity. The distribution of heat is

  1. Psitive 2/3 and negative 1 /3
  2. Positive 1 /3 and negative 2/3
  3. Positive 3/4 and negative 1/4
  4. Positive 1/4 and negative 3/4
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MCQ Multiple Choice Questions and Answers on Welding

Welding Question and Answer