1. Why is copper alloy chosen for crafting an electrode holder?
a. Due to its flexibility
b. For its firm grip on the electrode
c. Because of its excellent conductivity of heat and electricity
d. Ease of fabrication for the electrode holder

2. What is the impact of a carburizing flame on the welding of steel?
a. Increase in carbon content
b. Decrease in carbon content
c. Rise in heat
d. Development of cracks

3. In the oxy-acetylene process for welding brass sheets, which flame type is preferable?
a. Neutral flame
b. Carburizing flame
c. Oxidizing flame
d. Air-acetylene flame

4. During gas cutting, where should the nozzle be positioned?
a. Touching the work
b. 2 mm away from the work
c. 5mm away from the work
d. 10mm away from the work

5. What is the primary purpose of tacking in welding?
a. Ensuring part alignment
b. Preventing overlap
c. Avoiding heat-affected zones
d. Minimizing arc blow

6. In the base method, what contributes to the inadequate fusion of the bead?
a. Slow electrode travel
b. Excessive current
c. Insufficient current
d. Short arc length

7. Which welding defect is induced by low current in arc welding?
a. Porosity
b. Undercut
c. Lack of fusion
d. Excessive penetration

8. What effect is observed on the joint when an appropriately sized filler rod is used?
a. Enhanced penetration
b. Improved joint alignment
c. Prevention of excess convexity defects
d. Avoidance of incomplete penetration

9. When welding copper sheets using the oxy-acetylene process, which flame type is suitable?
a. Oxidizing flame
b. Carburizing flame
c. Neutral flame
d. Air-acetylene flame

10. Which flame type is selected for bronze welding of cast iron?
a. Oxidizing flame
b. Neutral flame
c. Carburizing flame
d. Acetylene flame

11. ____________ is a phenomenon involving the liberation of free electrons and ions within a gas atom.
a) Electrostatic polarization
b) Ionization
c) Covalent bonding
d) Exsolution reaction

12. Plasma arc welding is a ________________
a) Friction stir fusion
b) Fusion-based welding process
c) Electrothermic slag welding
d) Linear friction fusion

13. How many varieties of arcs are present in plasma arc welding?
a) Bipolar arcs
b) Quadrilateral arcs
c) Hexagonal arcs
d) Octagonal arcs

14. What can be utilized to weld stainless steel and non-ferrous metals, surpassing the capabilities of the oxy-acetylene flame.
a) Non-conductive arc
b) Transmissive arc
c) Electro-slag arc
d) Linear fusion arc

15. The arc initiates between the electrode and a water-cooled nozzle how?
a) Non-transferred electrical arc
b) Transferred energy arc
c) Electrode slurry arc
d) Linear energy arc

16. Power is sourced from _____________ during plasma arc welding.
a) Direct current (DC) power source
b) Alternating current (AC) Motor
c) Step-down electromagnetic transformer
d) None of the above

17. What is the maximal thickness of a joint achievable in the plasma arc welding process?
a) 35 millimeters
b) 25 millimeters
c) 45 millimeters
d) 60 millimeters

18. Non-consumable electrodes are crafted from _____________.
a) Carbonaceous material
b) Graphitic compounds
c) Either carbon or graphite
d) Identical material as the metal workpieces to be welded

19. ___________ Process utilizes heated gas to cut through metal.
a) Thermal arc cutting
b) Fusion-based welding
c) Electrode slurry welding
d) Linear frictional fusion

20. Plasma arc cutter produces temperatures soaring up to _____________.
a) 20,000 degrees Celsius
b) 40,000 degrees Celsius
c) 80,000 degrees Celsius
d) 60,000 degrees Celsius

Answers

1. C
2. A
3. C
4. B
5. A
6. C
7. C
8. C
9. C
10. A
11. D
12. A
13. A
14. A
15. C
16. C
17. D
18. B
19. A
20. A