WELDER IMPORTANT NIMI BASED MCQ
Which gas/mixture is likely to reduce the spatter loss in FCAW?
A. Argon and CO₂ mixed
B. Argon and helium mixed
C. CO₂ and helium mixed
D. Only CO₂ gas
Which metal is welded with self shielded type FCAW?
A. Low alloy steel
B. Stainless steel
C. Carbon steel
D. Different metal and different position
Which combination of metal and shielding gas give excellent cleaning action in GMAW welding process?
A. Copper, Argon
B. Aluminium, Helium
C. Magnesium, Argon
D. Stainless steel Argon
What is basic safety environmental condition for the welding area?
A. Dust free
B. Clean area
C. No congestion
D. Well ventilated
What is the trouble shooting to wire wrapping on drive rolls of wire feeder in GMAW?
A. Adjust drive rolls pressure
B. Replace drive rolls and guides
C. Check drive rolls align properly
D. Replace the drive motor
Which is the remedy for the contraction of weld metal due to excess of heat input that moves the base metal changes the angle?
A. Support on solid surface with two hands
B. Check gas flow rate and leakage of gas
C. Use clean and dry weld wire
D. Weld small segments and allow cooling
What is the operation to clean the cylinder valve before fixing the regulator to the argon cylinder?
A. Closing
B. Opening
C. Shutting
D. Cracking
What defect will occur in the weld metal if the arc voltage and travel speed is low in MIG / MAG welding?
A. Blow hole
B. Under cut
C. Wire struck
D. Weld overlap
What is the effect in MIG / MAG welding for a short stick out distance?
A. Porosity in weldment
B. Arc blow in weldment
C. Less spatter deposit in nozzle
D. More spatter deposit in nozzle
What is the weld defect if wire feed speed too high?
A. Porosity
B. Spatters
C. Incomplete fusion
D. Lack of penetration
Which type of defect is caused if the gas flowing rate is uneven?
A. Porosity
B. Distortion
C. Under cut
D. Incomplete fusion
What is the difficulty in starting of arc in GMAW?
A. Wrong polarity
B. Unsteady hand
C. Work piece dirty
D. Excess of voltage
How to troubleshoot the burn back problem if the contact tip is plugged or worn out?
A. Adjust the contact tip
B. Damaged cable connections
C. Clean and replace contact tip
D. Low voltage and insufficient heat
What do you call a weld joint having small holes/cavities due to entrapped gas packets?
A. Lack of fusion
B. Lack of penetration
C. Spatter
D. Porosity
What is the defect in a weld joint, in which the weld metal melting through base metal resulting in holes?
A. Excessive penetration
B. Lack of penetration
C. Burn through
D. Distortion
What is the name of the welding defect, with weld metal contracting during welding process?
A. Distortion
B. Excessive penetration
C. Lack of penetration
D. Porosity
What is the name of the defect occurring to an unsteady hand in GMAW?
A. Over fusion
B. Burn through
C. Distortion
D. Waviness of bead
What gas combination will reduce spatter defect and improve arc stability in a MIG/MAG welding process?
A. CO₂ / Neon
B. Argon / CO₂
C. Helium CO₂
D. Argon / CO₂ / O₂
What are the types of joint in friction welding?
A. T joint
B. Lap joint
C. Butt joint
D. Corner joint
What is the non-consumable electrode of high melting point used in TIG welding?
A. Carbon electrode
B. Copper electrode
C. Tungsten electrode
D. Aluminium electrode
