Welding MCQ Questions and Answers Quiz

21. Cast iron contains two elements, which make it difficult to cut it by gas cutting. What are these elements?

  1. Sulphur and phosphorous
  2. Silicon and graphite
  3. Graphite and phosphorous
  4. Silicon and sulphur

22. The function of the central hole in the tip of the cutting blowpipe is

  1. Supply oxygen for preheating
  2. Supply acetylene for preheating
  3. Supply oxygen for cutting
  4. Supply acetylene for cutting

23. In gas cutting, if too little cutting oxygen is supplied

  1. the metal will be cooled down
  2. the kerf will be narrow
  3. the kerf will be wide
  4. the metal will fail to cut completely

24. The size of the cutting nozzle used in oxy-acetylene cutting process depends mainly on

  1. thickness of metal to be cut
  2. purity of oxygen
  3. duration of cut
  4. type of cutting blowpipe

25. In a gas cut plate, the cut shows grooves and has deep drag lines. This is due to

  1. tip too close to the cut surface
  2. too much travel speed
  3. less oxygen pressure
  4. smaller size cutting nozzle

26. One of the functions of electrode coating is

  1. to increase welding current
  2. to stabilize the arc
  3. to prevent rusting
  4. to control arc temperature

27. In an acetylene cylinder, the acetylene is dissolved in

  1. Water
  2. Carbon Dioxide
  3. Acetone
  4. Mercury

28. Which one of the following is a temporary joint?

  1. Welded joint
  2. Riveted joint
  3. Soldered joint
  4. Press fit joint

29. In fusion welding, penetration is the ratio of

  1. width of the weld to its depth
  2. length of the weld to its depth
  3. depth of the weld to its width
  4. depth of the weld to its length

30. Which of the following joint have high corrosion resistance?

  1. Welding joint
  2. Riveted joint
  3. Bolted joint
  4. None of the above
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MCQ Multiple Choice Questions and Answers on Welding

Welding Question and Answer