PAPER -1 WELDER (THEORY) SEMESTER – I july (SESSION 2017 -2018) – NSQF LEVEL -4

11. Which thickness of mild steel plate is welded by rightward welding technique?
a) Above 5 mm
b) Above 3 mm
c) Above 1.5 mm
d) Above 10 mm

12. What is the capacity of oxygen gas in manifold system?
a) 160 m³
b) 120 m³
c) 150 m³
d) 90 m³

13. What is indicated by 18/8 in austenitic stainless steel?
a) 18% chromium, 8% nickel
b) 18% carbon, 8% nickel
c) 18% nickel, 8% chromium
d) 18% iron, 8% nickel

14. Which is the suitable filler rod for fusion welding of cast iron?
a) Super silicon cast iron fillerrod
b) Copper silver alloy filler rod
c) Manganese bronze filler rod
d) Cast iron filler rod

15. What is the melting point of aluminium oxide?
a) 1930°C
b) 1083°C
c) 1300°C
d) 659°C

16. Name the joint of the plates to be welded are placed in the same line.
a) T joint
b) Lap joint
c) Edge joint
d) Butt joint

17. Which arc length promote more surface tension effect?
a) Long Arc
b) Short Arc
c) Normal Arc
d) Medium Arc

18. Name the force that increases the deposit rate of weld metal in flat position.
a) Electromagnetic force
b) Surface tension
c) Gas expansion force
d) Gravity force

19. Which defect is prevented by using columbium added electrodes in stainless steel welding?
a) Spatter
b) Distortion
c) Excess deposition
d) Weld decay

20. Name the welding accessory.

a) Earth cable
b) Earth clamp
c) Electrode holder
d) Power cable