Welding MCQ Questions and Answers Quiz

21. 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

22. 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

23. 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

24. 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

25. 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

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

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

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

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

28. 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

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

  1. Welding joint
  2. Riveted joint
  3. Bolted joint
  4. None of the above

30. Which of the following is a design recommendation for welding?

  1. Welded assemblies should have more parts
  2. Welding should be done horizontally, with the stick or electrode holder pointing upward during welding
  3. The buildup of weld fillets should be kept to a minimum
  4. Locate welds where special finishing operations are required
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