Semester 1: Module 3 -Weldability of Steel

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All Type Welder Trades Part -3

NAME *

NAME OF THE ITI *

MOBILE NUMBER *

51 : What benefit we get out of a carburising flame? v *

2 points

A : Suitable for brass, copper welding

B : Suitable for stellite, flame cleaning

C : Suitable for mildsteel, stainless steel

D : Suitable for pure aluminium, cast iron & brass welding

52: What are the defects in generated acetylene gas? *

2 points

A : Oxygen, hydrogen & carbon

B : Carbon monoxide unburit ash

C : Hydrogen, dust particles, ash

D : Hydrogen, lime dust, ammonia & water vapour

53: What is the range of pressure used in an oxygen cylinder used in gas welding? *

2 points

A : 120 to 150 Kg/cm2

B : 110 to 150 Kg/cm2

C : 100 to 150 Kg/cm2

D : 90 to 150 Kg/cm2

54 : What should be the angle of filler rod, by rightward welding? *

2 points

A : 30° - 40°

B : 40° - 50°

C : 50° - 60°

D : 60° - 70°

55 : What thickness of plate, gas welding by forehand technique can be used without edge preparation? *

2 points

A : Up to 2.5 mm

B : Up to 3.15 mm

C : Up to 4 mm

D : Up to 5 mm

56 : What flux is used in welding brass? *

2 points

A : Anti - borax

B : Borax paste

C : Cryolite and berium chloride

D : Zinc chloride and potassium dichromate

57 : What flux is to be used for gas welding stainless steel plates? *

2 points

A : Borox flux

B : Anti - Borox

C : Cryolite and berium chloride

D : Zinc chloride and potassium dichromate paste

58 : Which filler rod to be used for gas welding aluminium? *

2 points

A : Silicon - brass

B : Silicon - manganese

C : Copper - Silver alloy

D : Pure aluminium, 5% silicon aluminium alloy

59 : What should be the pre - heating temperature of aluminium job for gas welding? | *

2 points

A : 200°C - 400°C

B : 250°C - 400°C

C : 300°C - 400°C

D : 350°C - 400°C

60 : What is the base for selecting the nozzle size for gas welding of a pipe? *

2 points

A : Groove angle

B : Welding position

C : Diameter of pipe

D : Pipe wall thickness

61 : What is the welding position as per ASME for a pipe joint held vertically, welding in a horizontal line? *

2 points

A : 1G

B : 2G

C : 5G

D : 6G

62 : What procedure is followed in welding pipe in 5 G position? *

2 points

A : Rotate pipe and weld vertically

B : Pipe not rotated weld verticality

C : Pipe not rotated and pipe axis 450

D : Pipe welded 12’o clock to 6’o clock downhill

63 : What size of CCMS filler rod is used for finish run of ɸ 50mm pipe root welded using ɸ1.65filler? *

2 points

A : ɸ 1.6 mm

B : ɸ 3.0 mm

C : ɸ 3.5 mm

D : ɸ 4.0 mm

64 : What size of electrode is used to weld 5mm wall thickness pipe? *

2 points

A : ɸ 2.5 mm

B : ɸ 3.15 mm

C : ɸ 4.00 mm

D : ɸ 5.00 mm

65 : Which test indicates the hardness of a metal? *

2 points

A : Brinell test

B : Tensile test

C : Charpy izod test

D : Ultrasonic inspection

66 : What will happen if the current is low while arc welding? *

4 points

A : Formed over lap

B : Spatterns are more

C : Electrode fused speedly

D : Base metal edges not melt properly

67 : What is the use of intermediate tacks on a weld setting of plates? *

4 points

A : To reduce the welding run

B : To control defects in weld joint

C : To speed up the welding joint

D : Align and to maintain the position of joint

68 : What is the main reason, that aluminium is difficult to weld? *

4 points

A : Less weight

B : Oxide formation

C : High thermal conductivity

D : Better strength weight ratio

69: When does the defect of gouging on cutting face takes place? *

4 points

A : Too much pre-heating

B : Too slow cutting speed

C : Excessive speed, inadequate pre-heating

D : Too much cutting oxygen pressure

70: What method of heating is done to remove bending distortion of weld joint with wedge shaped area? *

4 points

A : Spot heating

B : Pipe - needle heating

C : Triangular heating

D : Checker - board heating

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