WELDER (THEORY) SEMESTER – II AITT JAN 2018 PAPER

31. In welding, the area of base metal melted as determined on a cross-section of the weld is the –
(a) Heat — affected zone
(c) Dead zone
(b) Fusion zone
(d) Twilight zone

32. In TIG welding the electrode manipulated by the welder is –
(a) Made of tungsten
(c) Both (a) and (b)
(b) Not consumed
(d) None of these

33. When visually inspecting the root bead of a single V —butt weld it should be checked for-
(a) Lack of root penetration
(c) Tungsten inclusion
(b) HAZ hardness
(d) Slag

34. A burn — through in a welded joint may occur if –
(a) Current is too low
(c) Root gap is too large
(b) Root face is too large
(d) Arc voltage is too high

35. If a welding inspector detects a type of imperfection not allowed by the application standard, he should –
(a) Ask for explanation
(b) Reject the weld
(c) Prepare a concession request
(d) Reject the weld only if he considers it to be harmful

36. If the unit of power is expressed in watt, which of the following is a correct relationship?
(a) Power (watt) = Ampere x Volt
(c) Power (watt) = Volt x Ohm
(b) Power (watt) = Ampere x Ohm
(d) Power (watt) = Ampere x Volt x Ohm

37.1f 100 mm thick plates are to be welded, which of the following processes should be
selected so as to get high production rate with square edge preparation?
(a) Electroslag welding )
(c) TIG welding
(b) CO, welding
(d) Friction welding

38. In which of the following non-destructive methods, there is no need for supply of electricity?
(a) X —ray test
(c) Dye penetrant test
(b) Ultrasonic test
(d) Hydraulic pressure test

39. The limitation of electron beam welding is –
(a) High equipment cost
(b) The size of work chamber is a constraint
(c) Rapid solidification rate can cause cracking in some materials
(d) All of these

40. Protective equipment not suitable for eye protection from welding radiation includes –
(a) Welding helmet with filter plates
(c) Safety goggles with filter plates
(b) Clear safety goggles
(d) Protective screens