WELDER IMPORTANT NIMI BASED MCQ
Which is adjusted in Electron beam welding to eliminate the defect of porosity?
A. Spot size
B. Deflection
C. Weld penetration
D. Focal position / focus current
What is the approximate revolution of rotating member in friction welding process, to effect the weld joint?
A. 1500 rpm
B. 2000 rpm
C. 2500 rpm
D. 3000 rpm
Which gas is inactive or deficient is active chemical properties in TIG welding?
A. Argon
B. Oxygen
C. Hydrogen
D. Acetylene
What is the purpose of inert gas used in TIG welding?
A. Contamination in the weld metal
B. To protect the molten metal from the atmospheric contamination
C. To stabilize the Arc
D. To get more spatters
Which gas is issued as inert gas in GTAW for increased speed?
A. Oxygen
B. Helium
C. Acetylene
D. Hydrogen
How much temperature GTAW process can produce?
A. 3000°F
B. 3500°F
C. 4000°F
D. 4500°F
What is the main source of heat to the workpiece in TIG welding?
A. Cable current
B. By Torch
C. By tube
D. By electrode
How heat effected zone is covered and protected from atmospheric contaminations in GTAW?
A. Argon gas
B. Oxygen gas
C. Fuel gas
D. Active gas
What is the use of a little hydrogen added to argon for welding of stainless steel in GTAW process?
A. Improves heat
B. Improves heat transfer
C. Improves good welding
D. Improves metal property
How molten metal is shielded from the atmospheric contamination as a blanket in GTAW?
A. By using inert gas
B. By using fuel gas
C. By using supportable gas
D. By using fuel and supportable gas
How is the inert gas directed to flow over weld pool, in TIG welding?
A. Through copper nozzle
B. Through brass nozzle
C. Through ceramic nozzle
D. Through metal nozzle
What is the name of the part of TIG torch for holding tungsten electrode?
A. Collet
B. Adaptor
C. Ceramic nozzle
D. Electrode cap
What is the purpose of H.F. unit in TIG welding?
A. To produce the AC
B. To change AC to DC
C. To produce power supply
D. To initiate the arc without touching the electrode on the base metal
Which type of cooling system is used in heavy duty welding operations?
A. Air cooled
B. Oil cooled
C. Gas cooled
D. Water cooled
Which electrode is used in TIG welding process?
A. Zinc electrode
B. Carbon electrode
C. Tungsten
D. Magnesium electrode
What is the device used to show the volume of the inert gas allowed to go to the welding torch in TIG welding?
A. Flow meter
B. CO₂ regulator
C. Pressure meter
D. Argon regulator
Which gas is chemically inactive with any metals in hot or cold condition in TIG welding?
A. Argon
B. Oxygen
C. Nitrogen
D. Hydrogen
Which type of tungsten electrode is suitable for welding of SS by TIG process with DC?
A. Pure tungsten electrode
B. Cerium tungsten electrode
C. Thoriated tungsten electrode
D. Zirconium tungsten electrode
What is the process of replacing the air in a pipe with argon gas that will not react with the root of the weld?
A. Pouring
B. Purging
C. Pre filling
D. Pool weld
Which electrode is used to produce arc in GTAW process?
A. M.S electrode
B. Cast iron electrode
C. Tungsten electrode
D. Stainless steel electrode
