Gas Metal Arc Welding MCQ Question and Answer | ITI WELDER

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ITI Welder | Gas Metal Arc Welding MCQ

1.

What type of safety equipment is worn while checking the welding joint of a overhead crane frame?

1. Apron
2. Helmet
3. Hand gloves
4. Hand screen

2.

What is the name of welding process if the arc produced by a consumable metal electrode is protected by inert gas?

1. MAG welding
2. MIG welding
3. TIG welding
4. Plasma welding

3.

What is the name of the part marked as ‘X’ in the GMAW wire feed unit?

1. Gear box
2. Centre guide
3. Idler gear
4. Wire feed roller

4.

What is the name of the part marked as ‘X’ in the GMAW?

1. Electrode wire
2. Contact tip
3. Nozzle
4. Co2 gas

5.

How is thermit mixture ignited?

1. Petrol
2. Diesel
3. Fire stick
4. By match or magnesium ribbon.

6.

What is the name of part marked as ‘X’ in the submerged arc welding?

1. Wire feeder
2. Auto torch
3. Flux hopper
4. Electrode lead

7.

Which welding method starting of welding done by using steel wool or iron powder?

1. SAW
2. GTAW
3. GMAW
4. MMAW

8.

What are the gases mixed for shielding in FCAW?

1. Argon and O2
2. Argon and CO2
3. Helium and CO2
4. Argon and helium

9.

How many types of flux cored wires are used in FCAW?

1. 2 types
2. 3 types
3. 4 types
4. 5 types

10.

Which type of electrode provides protective slag in flux cored arc welding?

1. Tubular cored flux electrode
2. External cored electrode
3. Additional cored flux electrode
4. Shielding gas type only

11.

What device is used to protect face from UV and Infra-red radiation during welding?

1. Blue goggles
2. Plain goggles
3. White goggles
4. Helmet with filtered colour glass

12.

What protective equipment (PPE) is used to protect hand from burning injury?

1. Apron
2. Goggles
3. Protective shield
4. Leather gloves

13.

Which gas is generated during GMAW on using CO2 as shielding gas?

1. Helium
2. Carbon monoxide
3. Argon
4. Oxygen

14.

What type of lens shade is to be fixed in helmet while doing MIG welding?

1. A # 09
2. A # 10
3. A # 11
4. A # 12

15.

What is the lens shade fitted in a helmet as per the recommendation of welding code for setting of 150 Amps for MMAW?

1. A # 10
2. A # 11
3. A # 12
4. A # 13

16.

Which type of apron is suitable to protect from heat & radiation during welding?

1. Silk apron
2. Cotton apron
3. Leather apron
4. Asbestos apron

17.

What is the name of part marked ‘X’ in GMAW wire feed unit?

1. Gear box
2. Wire feed roller
3. Centre guide
4. Idler gear

18.

Which angle of pre setting is to compensate distortion on horizontal single V butt joint metal thickness 10 mm and root gap 2mm ?

1. 173°
2. 178°
3. 180°
4. 183°

19.

How many types of basic welding positions in GMA welding?

1. 2 types
2. 3 types
3. 4 types
4. 5 types

20.

Which is the weld position of GMA welding if the weld is deposited underside of the job?

1. Vertical position
2. Horizontal position
3. Over head position
4. Down head position

21.

What type of joints are made by the groove welds in GMA welding?

1. Butt weld
2. T weld
3. Corner weld
4. Lap weld

22.

What is the angle, marked as ‘X’ in the fillet weld shown?

1. Base metal
2. Weld metal
3. T joint
4. ‘Direction of travel’

23.

Which shielding gas is used in MIG welding?

1. Argon
2. Argon + 20% CO2
3. Argon + 1% oxygen
4. Argon + 10% hydrogen

24.

Which type of weld is developed electro slag welding?

1. Gas welding
2. Resistance welding
3. Submerged arc welding
4. Shielded metal arc welding

25.

How many types of metal transfer in GMAW/CO2 welding process?

1. One
2. Two
3. Three
4. Four

26.

What is the part marked as ‘x’ in GMAW wire feed unit?

1. Gear box
2. Idler gear
3. Wire feed roller
4. Input guide assembly

27.

What is the name of the part ‘X’ in the GMAW principle of CO2 welding?

1. Electrode wire
2. Contact tip
3. Nozzle
4. CO2 gas

28.

What is the ability of metal to cut another metal?

1. Creep
2. Fatigue
3. Hardness
4. Strength

29.

What ampere range is required for setting 1.2mm filler wire for welding mild steel in MIG/MAG welding?

1. 50 - 100 Amps
2. 70 - 120 Amps
3. 90 - 150 Amps
4. 100 - 225 Amps

30.

What is the temperature produced by chemical reaction in thermit welding?

1. 5000° C
2. 5000° F
3. 4000° C
4. 4000° F

31.

Which type of welding is to be used to make joint of thick pipes of rails?

1. Thermit welding
2. Non - Pressure Thermit welding
3. Pressure Thermit welding
4. Fusion Thermit welding

32.

Where is electron beam generated, controlled and accelerated?

1. Atmosphere
2. Electron gun
3. Transport system
4. Vacuum chamber

33.

What is the source of heat to melt the work piece in an electron beam welding?

1. By heat
2. By high speed electrons
3. By beam heat
4. By current

34.

Which welding process granulated flux is fed through hopper to the welding spot?

1. GTAW
2. SMAW
3. GMAW
4. SAW

35.

What are the positions used in SAW?

1. Flat
2. Vertical
3. Overhead
4. Flat and horizontal

36.

Which type of welds are often used to assist assembly or to maintain edge alignment during welding?

1. Root run weld
2. Level weld
3. Tack weld
4. Stringer bevel

37.

What is the usual torch angle tilt on either side of vertical in GMAW?

1. 10° - 20°
2. 20° - 25°
3. 25° - 30°
4. 30° - 35°

38.

What defects occur to a weld joint, if it is provided with insufficient heat input?

1. Lack of fusion
2. Lack of penetration
3. Lack of metal deposit
4. Uneven bead deposit

39.

What is the solution if burn back occurs due to irregular wire feeding in GMAW process?

1. Cut out kink wire
2. Replace of spool
3. Cut the kink wire and replace spool
4. Adjusted to kinked wire again

40.

Which metal surfacing method is ideal for thin layers that can flow to corner and edges of the job?

1. TIG welding
2. MIG welding
3. Oxy-acetylene welding
4. Submerged arc welding

41.

Which type of core wire is suitable for welding carbon steel, alloy steel and stainless steel under FCAW?

1. Flux cored electrode
2. Gas shield flux wire
3. Used flux core and gas shielded
4. Flux is external and shielded

42.

What is the distinet differences between GMAW and FCAW equipments?

1. Nozzle and torch
2. Construction of torch and feed rollers
3. Machine and torch
4. Feed rolls and gas cylinders

43.

What is the name of metal transfer system in FCAW?

1. Dip transfer
2. Free flight transfer
3. Globulor transfer
4. Purged transfer

44.

Why the argon and CO2 mixture is used in FCAW?

1. Smooth spray transfer, with minimum slag
2. Smooth globular transfer
3. Smooth pulsed transfer
4. Smooth dip transfer

45.

Why different type of pressure rollers are used in FCAW?

1. Knurled rollers
2. Without roller of travel wire
3. With pressure of tubular wire
4. Positive feeding without pressure on tubular wire

46.

Which type of welding under FCAW, is more suitable for welding all types of steel?

1. Only use flux cored electrode
2. Only use gas shielding flux
3. Using flux cored and additional gas shielding
4. Flux is external and also gas external

47.

What type of hand tool is used to open a gas cylinder in welding practice?

1. X key
2. Allen key
3. DE spanner
4. Spindle key

48.

Why the welder’s cloth should be free from oil, grease etc, while welding?

1. To protect the job
2. To deflect the arc rays
3. To avoid catching fire
4. To safe guard your inner cloth

49.

Which electrode wire is more suitable for carbon steel fabrication in GMAW process?

1. 70S - 6
2. 70T - 2
3. 70S - 2
4. 70S - 3

50.

Which metal transfer process in GMAW produces strong weld with least spatter?

1. Spray transfer
2. Globular transfer
3. Dip transfer
4. Pulsed transfer

51.

Why the argon and CO2 mixing gas used in FCAW?

1. Smooth spray transfer of melt
2. Smooth globular transfer
3. Smooth pulsed transfer
4. Smooth dip transfer

52.

How the pre-heating temperature is checked before welding wrought iron or cast metals?

1. Flow of spatters
2. Size of blow holes
3. Temperature indicating crayon
4. Count of pin holes

53.

Which is the operation to relieve residual stresses from the welding joint?

1. Pre-heating
2. Peening
3. Drilling
4. Post heating

54.

Which is the only welding position in electro slag welding process?

1. Down hand
2. Horizontal
3. Vertical
4. Over head

55.

Why carbon and manganese are added to plain thermit mixture on rail welding?

1. To get good fusion
2. To get hardness
3. To get fine welding
4. To get smooth finishing

56.

What type of weld is used on prepared holes of overlap joints?

1. Tack weld
2. Fillet weld
3. Backing weld
4. Plug or slot weld

57.

Which is the pipe joint for given pipe development?

1. Y joint
2. 90° T joint
3. 60° branch joint
4. 50° branch joint

58.

Which is the weld position of GMA welding if the filler metal is deposited from the upper side of the joint during welding?

1. Vertical position
2. Horizontal position
3. Over head position
4. Down hand position

59.

What is the type of weld position in which the weld metal is deposited under side of the joint?

1. Down hand position
2. Horizontal position
3. Vertical position
4. Overhead position

60.

What is the usual torch angle tilt on either side of vertical in GMAW?

1. 10° - 20°
2. 20° - 25°
3. 25° - 30°
4. 30° - 35°

61.

What is the electrode inclination to the metal surface in T-joint welding of 10 mm thickness metal by down hand position?

1. 30°
2. 45°
3. 60°
4. 75°

62.

What is the usual length of tack weld in a T- joint in GMAW flat position welding?

1. 5 mm
2. 10 mm
3. 15 mm
4. 20 mm

63.

How much root gap ‘x’ is maintained?

1. 1 mm
2. 2 mm
3. 1.5 mm
4. 2.5 mm

64.

What is the purpose of fitting clear glasses on either side of coloured glass in a helmet?

1. Protect from rays
2. Protect from heat
3. Protect from spatters
4. Protect from radiation

65.

How the welder observes welding area of the joint in electron beam welding?

1. Safe optical mirror
2. Safe optical helmet
3. Safe optical hand screen having correct shade
4. Safe optical viewing system containingoptical mirror

66.

How to protect from the toxic fumes during welding operation?

1. Wear helmet
2. Use hand screen
3. Use leather apron
4. Use respirator pad

67.

What is the purpose of using copper coated filler wire in MIG / MAG welding?

1. To remove fumes
2. To prevent rust
3. To prevent atmosphere
4. To prevent base metal reaction

68.

What is the angle of inclination of weld torch for flat position in GMAW welding process?

1. 5° - 10°
2. 10° - 15°
3. 15° - 25°
4. 25° - 35°

69.

How many Kgs weight of thermit is required against one Kg of wax?

1. 10 to 15 Kgs
2. 11 to 15 Kgs
3. 12 to 14 Kgs
4. 12 to 16 Kgs

70.

Which is adjusted in electron beam welding to eliminate the defect of porosity?

1. Spot size
2. Deflection
3. Weld penetration
4. Focal position / focus current

71.

What is the limitation for submerged arc welding process?

1. Limited to vertical position
2. Limited to non ferrous metals
3. Limited to over head position
4. Limited to flat and horizontal fillet welds

72.

What ampere range required for setting 1.2mm filler wire for welding mildsteel in MIG/MAG welding?

1. 50 - 100 Amps
2. 70 - 120 Amps
3. 90 - 150 Amps
4. 100 - 225 Amps

73.

Which combination of shield gas in GMAW process produce good arc stability for carbon steel?

1. Argon + 20% CO2
2. CO2
3. Pure argon
4. Argon + 5% CO2

74.

How the filler wire is fed in the GMAW welding process?

1. Manually
2. No feeding
3. Automatically
4. Semi automatic

75.

Which type of electrodes are used in MAG/CO2 welding?

1. Flux coated electrodes
2. Bare wire electrode
3. Flux cored electrodes
4. Tungsten electrode

76.

What is the range of electrode for MAG / CO2 welding?

1. 0.8 to 1.6 mm
2. 0.7 to 1.3 mm
3. 0.6 to 0.9 mm
4. 0.5 to 0.7 mm

77.

What type of operation is generally used in GMAW?

1. Automatic
2. Semi automatic
3. Fully automatic
4. Manual method

78.

Which heat treatment of steel increases hardness, but decreases strength & ductility?

1. Annealing
2. Hardening
3. Normalising
4. Case hardening

79.

Which heat treatment process produces only outer surfaces of job hardened, to some depth?

1. Annealing
2. Hardening
3. Normalising
4. Case hardening

80.

Which heat treatment process is employed to remove brittleness in a chisel?

1. Annealing
2. Hardening
3. Tempering
4. Normalising

81.

What is the operation of heating steel to specific temperature and cooling suddenly?

1. Annealing
2. Hardening
3. Tempering
4. Quenching

82.

What is the main purpose of ‘Normalising’ steel?

1. To control hardness
2. To prevent cracking
3. To make welding operation easier
4. To produce fine grain of uniform structure

83.

Which heat treatment process, if material is softened & suitable for machining?

1. Annealing
2. Tempering
3. Normalising
4. Case hardening

84.

What is the name of heat treatment process where the steel is reheated to a suitable temperature below the critical point (heating) to improve the toughness and ductility?

1. Annealing
2. Hardening
3. Tempering
4. Normalising

85.

Which heat treatment process is very similar to annealing but the job are allowed to cool in air?

1. Hardening
2. Tempering
3. Normalising
4. Case hardening

86.

What type of test is used for vessels, tanks and pipe containing pressure?

1. Visual inspection
2. Leak or pressure test
3. Stethoscopic test
4. Magnetic particals test

87.

What is the NDT method, used to detect surface and subsurface defects on ferrous metals, using iron power?

1. X-ray test
2. Gamma ray test
3. Magnetic particle test
4. Stethoscopic test

88.

What Non-destructive test is done using coloured dye and fluorescent liquid to find minute cracks?

1. Radiographic test
2. Magnetic test
3. Ultrasonic test
4. Liquid penetration test

89.

What is the test set up for weld specimen?

1. Tensile test
2. Impact test
3. Free bend test
4. Guided bend test

90.

Which welding process is done by chemical reaction between a metal oxide and metal?

1. Electro slag welding
2. Election beam welding
3. Thermit welding
4. TIG welding

91.

How much time it takes for the thermit mould to cool, after welding by thermit process?

1. 7 Hrs
2. 9 Hrs
3. 10 Hrs
4. 12 Hrs

92.

What is the reason that obstructed joints cannot be welded by electron beam welding process?

1. Electron beam travel in curved line
2. Electron beam travel in different direction
3. Electron beam travel only in straight line
4. Electron beam travel in circular line

93.

How much gas flow rate is required to weld a butt joint with 0.8 mm dia MS filler rod of wire feed rate 3 - 4 m/min at 18 to 20 volts?

1. 6 to 8 Lpm
2. 8 to 10 Lpm
3. 10 to 12 Lpm
4. 12 to 14 Lpm

94.

What should be the initial angle of two plates in a T joint if the final angle between them is 90° after completion of welding?

1. 93°
2. 90°
3. 85°
4. 75°

95.

What is percentage of deposition efficiency in FCAW process?

1. 93% to 97%
2. 80% to 86%
3. 70% to 76%
4. 60% to 67%

96.

Which gas/mixture is likely to reduce the spatter loss in FCAW?

1. Argon and CO2 mixed
2. Argon and helium mixed
3. CO2 and helium mixed
4. Only CO2 gas

97.

Which metal is welded with self shielded type FCAW?

1. Low alloy steel
2. Stainless steel
3. Carbon steel
4. Different metal and different position

98.

Which combination of metal and shielding gas give excellent cleaning action in GMAW welding process?

1. Copper, Argon
2. Aluminium, Helium
3. Magnesium, Argon
4. Stainless steel Argon

99.

What is basic safety environmental condition for the welding area?

1. Dust free
2. Clean area
3. No congestion
4. Well ventilated

100.

What is the trouble shooting to wire wrapping on drive rolls of wire feeder in GMAW?

1. Adjust drive rolls pressure
2. Replace drive rolls and guides
3. Check drive rolls align properly
4. Replace the drive motor

101.

Which is the remedy for the contraction of weld metal due to excess of heat input that moves the base metal changes the angle?

1. Support on solid surface with two hands
2. Check gas flow rate and leakage of gas
3. Use clean and dry weld wire
4. Weld small segments and allow cooling

102.

What is the operation to clean the cylinder valve before fixing the regulator to the argon cylinder?

1. Closing
2. Opening
3. Shutting
4. Cracking

103.

What defect will occur in the weld metal if the arc voltage and travel speed is low in MIG / MAG welding?

1. Blow hole
2. Under cut
3. Wire struck
4. Weld overlap

104.

What is the effect in MIG / MAG welding for a short stick out distance?

1. Porosity in weldment
2. Arc blow in weldment
3. Less spatter deposit in nozzle
4. More spatter deposit in nozzle

105.

What is the weld defect if wire feed speed too high?

1. Porosity
2. Spatters
3. Incomplete fusion
4. Lack of penetration

106.

Which type of defect is caused if the gas flowing rate is uneven?

1. Porosity
2. Distortion
3. Under cut
4. Incomplete fusion

107.

What is the difficulty in starting of arc in GMAW?

1. Wrong polarity
2. Unsteady hand
3. Work piece dirty
4. Excess of voltage

108.

How to troubleshoot the burn back problem if the contact tip is plugged or worn out?

1. Adjust the contact tip
2. Damaged cable connections
3. Clean and replace contact tip
4. Low voltage and insufficient heat

109.

What do you call a weld joint having small holes/cavities due to entrapped gas packets?

1. Lack of fusion
2. Lack of penetration
3. Spatter
4. Porosity

110.

What is the defect in a weld joint, in which the weld metal melting through base metal resulting in holes?

1. Excessive penetration
2. Lack of penetration
3. Burn through
4. Distortion

111.

What is the name of the welding defect, with weld metal contracting during welding process?

1. Distortion
2. Excessive penetration
3. Lack of penetration
4. Porosity

112.

What is the name of the defect occuring to an unsteady hand in GMAW?

1. Over fusion
2. Burn through
3. Distortion
4. Waviness of bead

113.

What defects occurs to a weld joint, if it is provided with insufficient heat input?

1. Lack of fusion
2. Lack of penetration
3. Lack of metal deposit
4. Uneven bead deposit

114.

What gas combination will reduce spatter defect and improve arc stability in a MIG/MAG welding process?

1. CO2 / Neon
2. Argon / CO2
3. Helium CO2
4. Argon / CO2 / O2