Welding MCQ Questions and Answers Quiz

11. 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

12. The size of a welding machine is determined by

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

13. 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

14. 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

15. 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

16. The correct flame for preheating before cutting is

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

17. 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

18. 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

19. The correct colours for oxygen and acetylene hoses are:

  1. Red for oxygen and blue for acetylene
  2. Black for oxygen and red for acetylene
  3. Black for oxygen and maroon for acetylene
  4. Red for oxygen and maroon for acetylene

20. Which one of the following is the type of transformer used in arc welding?

  1. Step down
  2. Step up
  3. One-to-one
  4. Capable of increasing supply voltage
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MCQ Multiple Choice Questions and Answers on Welding

Welding Question and Answer