Welding MCQ Questions and Answers for Practice

1. 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

2. 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

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

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

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

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

5. 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

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

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

7. 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

8. Which of the following processes do not use flux during welding?

1. Submerged Arc
2. Oxyfuel
3. Flux Cored Arc
4. Friction

9. Which of the following is not a resistance welding?

1. Spot welding
2. Butt welding
3. Pressure welding
4. Percussion welding

10. The resistance welding process suitable for welding ferrous and non-ferrous metals upto 8mm thickness is

1. Spot welding
2. Projection welding
3. Butt welding
4. Pressure welding

11. Which of the following is false regarding welding process and its corresponding minimum thickness of plate material?

1. Shielded-Metal Arc or Stick Weldments: minimum thickness - 1.5 mm
2. Submerged Arc Weldments: minimum thickness - 4.5mm
3. Flux-Cored Weldments: minimum thickness - 4.5 mm
4. Gas-Metal Arc Weldments: minimum thickness - 0.5 mm and even thinner

12. Which of the following welding process is used for welding of sheet metals in automobile and air craft industries?

1. Shield metal arc welding
2. Gas tungsten arc welding
3. Thermit welding
4. Resistance welding

13. Heat is created by the chemical reaction in

1. Resistance welding
2. Oxy-acetylene welding
3. Tungsten arc welding
4. Thermit welding

14. Which of the processes can be classified as solid state welding?

1. Oxyfuel welding
2. Electron beam welding
3. Diffusion welding
4. Resistance welding

15. Which flame is suitable for welding of ferrous metals, Cu and Al alloys?

1. Oxidising flame
2. Carburising flame
3. Neutral flame
4. None of the above