WELDER IMPORTANT NIMI BASED MCQ

What does the letter ‘X’ indicate in the electrode classification of EB5426 H1 J X?
A. Covered electrode
B. Increase metal recovery
C. Hydrogen controlled electrode
D. Radio graphic quality electrode

What is the percentage of carbon in medium carbon steel?
A. 0.05% to 0.30%
B. 0.05% to 0.8%
C. 0.30% to 0.6%
D. 0.6% to 1.2%

What is the defect of metal flowing into the surface of base metal without fusing it?
A. Over lap
B. Under cut
C. Lack of fusion
D. Lack of penetration

Which one of the defect is caused by low current in arc welding?
A. Porosity
B. Under cut
C. Lack of fusion
D. Excessive penetration

What is the cause of hair line separation in the bead in arc welding?
A. Fast cooling
B. Slow cooling
C. Long arc length
D. Wrong selection of electrode

What is the name of the steel material which are not weldable?
A. High carbon steel
B. Medium carbon steel
C. Austenitic stainless steel
D. Ferrite and martensitic stainless steel

Which is used to cut thin pipes of smaller sizes?
A. Chisel
B. Hack sawing
C. Pipe cutter
D. Lathe parting tool

What is the base for selecting the nozzle size for gas welding of a pipe?
A. Groove angle
B. Welding position
C. Diameter of pipe
D. Pipe wall thickness

Which type of filler rod shall contain higher percentage of iron?
A. Ferrous
B. Non – ferrous
C. Alloy type of ferrous metals
D. Alloy type of non – ferrous metals

What is the process of heating steel to specific temperature and cooling suddenly?
A. Annealing
B. Hardening
C. Tempering
D. Quenching

What is the main purpose of ‘Normalising’ steel?
A. To control hardness
B. To prevent cracking
C. To make welding operation easier
D. To produce fine grain of uniform structure

What is the purpose of setting root gap?
A. To over some under cut
B. To control distortion
C. To get good penetration
D. Gap get closed due to expansion

Which of the following metals have high thermal conductivity?
A. Brass
B. Bronze
C. Copper
D. Aluminium

What is the process of hot weld joint rapidly hammered to relieve internal stresses?
A. Peening
B. Annealing
C. Heat treatment
D. Straightening

Which type of cast iron possess higher hardness?
A. Grey cast iron
B. White cast iron
C. Nodular cast iron
D. Malleable cast iron

Which type of cast iron is soft?
A. Grey cast iron
B. White cast iron
C. Nodular cast iron
D. Malleable cast iron

Which size of filler rod should be used to weld 2mm thick MS sheet?
A. 1.6 mm
B. 2.0 mm
C. 2.5 mm
D. 3.15 mm

What is the main function of the flux coating in electrodes?
A. To prevent rusting
B. To stabilize the arc
C. To control arc temperature
D. To increase welding current

What is the purpose of oxygen lever in gas cutting?
A. Pre heat the base metal
B. Push the molten metal
C. Remove the excess metal
D. Release excess oxygen and to push the molten metal

Which gauging nozzle is selected for rivet head cutting?
A. Bent nozzle with three pre-heating holes
B. Straight nozzle with six pre-heating holes
C. Bent nozzle with six holes
D. Flute cutting straight with six holes