WELDER IMPORTANT NIMI BASED MCQ

Which will not be present on the weld bead due to use of shielding gas in TIG welding process?
A. Slag
B. Over lap
C. Under cut
D. Penetration

Which process can easily weld thin metal?
A. MIG welding
B. Tungsten arc welding
C. Submerged arc welding
D. Manual metal arc welding

Why argon gas is used in welding of stainless steel welding in TIG welding process?
A. Inert gas protects the weld
B. It helps in melting the electrode
C. It prevents porosity
D. It is cheap

Which welding machine is to be used for welding of aluminium by TIG welding process?
A. AC welding machine
B. DC welding machine
C. AC & DC transformer
D. DC transformer

What is the defect caused by high current in TIG welding?
A. Crack
B. Porosity
C. Under cut
D. Lack of penetration

What is the reason for unstable arc in DC TIG welding process?
A. Improper tungsten size
B. Improper shielding gas flow
C. Improperly prepared tungsten
D. Weld circuit polarity is incorrect

What is the cause for poor weld bead colour in TIG welding process?
A. Too much arc length
B. Excessive heating in torch
C. Tungsten melting into weld puddle
D. Contaminated or improper filler metal

What is the temperature in the weld area plasma arc welding process?
A. 20,000°C to 30,000°C
B. 30,000°C to 35,000°C
C. 15,000°C to 20,000°C
D. 35,000°C to 40,000°C

What material is used to make electrode in spot welding?
A. Iron electrode
B. Copper alloy electrodes
C. Silicon electrodes
D. Cast iron electrodes

Which resistance welding machine is provided with an electrode in wheel shape?
A. Spot welding
B. Seam welding
C. Projection welding
D. Flash butt welding

Which welding process effects weld joints under heavy pressure, with supply cut off?
A. Flash-butt welding
B. Fusion welding
C. Thermit welding
D. Spot welding

Which resistance welding process produces a bulge at weld joint?
A. Flash butt
B. Spot
C. Seam
D. Projection

What is the angle of “off set tip” electrode used in spot welding?
A. 30°
B. 40°
C. 50°
D. 60°

Which electrode is movable in spot welding?
A. Both moved
B. Both not moved
C. Upper electrode
D. Lower electrode

Which electrode is used in plasma arc welding?
A. Cast iron
B. Mild steel
C. Tungsten
D. Stainless steel

Which welding process where a ‘nugget’ is formed in the weld joint?
A. Arc welding
B. Seam welding
C. Spot welding
D. Percussion welding

Which welding process is used to weld stainless steel wire mesh and surgical instruments
A. Electrode beam welding
B. Electro slag welding
C. Micro plasma welding
D. Plasma welding

Which process is used to cut stainless steel metal?
A. Plasma arc cutting process
B. Micro plasma cutting process
C. Key hole plasma process
D. Plasma cutting

Which gas is suitable for welding of stainless steel, nickel alloys by plasma arc welding?
A. Argon
B. Helium
C. Hydrogen
D. Neon

Which gas is suitable for welding of carbon steel and titanium by plasma arc welding process?
A. Helium
B. CO₂
C. Argon
D. Neon