1. Which type of filler rod is to be selected to avoid weld decay in stainless steel welding?(A) Columbium based (B) Copper coated mild steel(C) Phosphor bronze (D) Super silicon
2. The distance between the root and toe of a fillet weld is called(A) root gap (B) leg length(C) reinforcement (D) throat thickness
3. The current set for 3.15 mm medium coated mild steel electrode is(A) 50 to 80 amps (B) 90 to 120 amps(C) 120 to 150 amps (D) 150 to 170 amps 4. Which type of arc length is used for welding in horizontal position ?(A) Short arc (B) Long arc (C) Correct arc (D) None 5. Lack of penetration in a butt welded joint is due to(A) too low welding speed (B) short arc length(C) high current (D) low current 6. Name the defect, in which the weld metal is following on the surface on the base metal without fusing.
(A) Crater (B) Overlap
(C) Lack of
fusion
(D) Excessive
convexity
7. The type of edge preparation done for gas welding a 4 mm thick copper butt joint is
(A) single beval (B) single V (C) double V (D) square 8. How to specify the size of an electrode holder ?(A) By its weight (B) By its shape(C) By its current carrying capacity (D) By the metal used for making it 9. If the travel speed of electrode is high, which type of weld defect you will get on T fillet joint ?(A) Over lap (B) Slag inclusion(C) Excessive reinforcement (D) Lack of root penetration
10. Which internal defect is occurs to use of wet electrodes ?
(A)
Undercut
(B) Porosity
(C)
Crater
(D)
None of these
11. A keyhole is to be maintained throughout the welding of the first run in a butt joint to ensure(A) crack free weld (B) proper bead width(C) good reinforcement (D) proper root penetration
12. A welding transformer may be(A) Air cooled or water cooled (B) Water cooled or oil cooled(C) Air cooled or oil cooled (D) None of these
13. What is the reason for selecting DC reverse polarity for welding copper by arc ?(A) Copper is a good conductor of heat.(B) Copper when melted does not flow freely.(C) 1/3rd of arc heat is concentrated on the electrode.(D) 2/3rd of the arc heat is concentrated on the electrode.
14. Which shade No. of filter glass you will select for the welding helmet for shielded metal arc welding ?(A) Shade No. 11 & 12 (B) Shade No. 10 & 11(C) Shade No. 9 & 10(D) Shade No. 12 & 13
15. Which one of the below given welding machines can be used for both AC and DC welding ?(A) Engine driven welding generator (B) Motor driven welding generator(C) Welding transformer (D) Welding rectifier
16. What should be the shade number of the filter glass to be used in Arc welding with 150 Ampcurrent ?(A) Shade No. 6 (B) Shade No. 8 (C) Shade No. 10(D) Shade No. 20
17. What is the effect of the Arc Length used for the Long Arc ?(A) Unstable arc(B) Correct metal deposition(C) Even burning of the electrode(D) Wastage due to melting of electrode
18. In arc welding arc blow can be avoided by(A) Using A/C Transformer Machine(B) Increasing arc length(C) Using bare electrode(D) Welding away from earth ground connection