ELECTRODE IN MMAW

 

1. The electrodes are manufactured in two standard length namely..
      (a) 350mm & 250mm
      (b) 350mm & 450mm
      (c) 400mm & 500mm
      (d) 200mm & 400mm
        

        Ans. (b)
2. The electrode size refers to 
       (a) diameter of its core wire
       (b) diameter(over all) of electrode
       (c) thickness of flux coating 
       (d) length of electrode

         Ans. (a)

3. There  are two methods by which flux coating is applied on the electrode core wire. These are:
        (a) dipping & sucking
        (b) sucking & blowing

        (c) dipping & extrusion

        (d) blowing & extusion

        Ans. (c)

4. What is the name of last bit of an discarded electrode?

        (a) Dead end

        (b) Stub end 

        (c) waste end

        (d) Red end

        Ans. (b)

5. One of the function of electrode coating is....

        (a) to increase welding current

        (b) to stabilize the arc

        (c) to prevent rusting 

        (d) to control arc temperature

        Ans. (b)

6. What do you call the non-coated electrodes?

        (a) Row electrode 

        (b) Bare electrode

        (c) Base electrode 

        (d) Deep penetration electrode

         Ans. (b)

7. Contact electrode have in their coatings a large amount of...

        (a) silicon

        (b) carbon

        (c) iron

        (d) manganese

        Ans. (c)

8. This type of electrodes deposit a large amount of weld metal per unit .

        (a) Low hydrogen electrode 

        (b) Iron powder electrode 

        (c) Deep penetration electrode

        (d) Heavy coated S.S electrode

        Ans. (b)

9. which gases from the atmosphere must be prevented from entering the weld pool?

        (a) Oxygen and nitrogen

        (b) Oxygen and carbon dioxide 

        (c) Oxygen and argon 

        (d) Oxygen and argon

        

        Ans. (a)

10. Which type of electrode will pick-up moisture easily

        (a) Acidic coated electrode 

        (b) Rutile coated electrode 

        (c) Basic coated electrode 

        (d) Titanium coated electrode

        Ans. (c)

11. Always cellulosic materials will be used in this type of electrode flux coating. These electrode are

        (a) Low hydrogen 

        (b) Gouging elctrodes

        (c) Deep penetration electrode

        (d) Stainless steel electrode

        Ans. (c)

12. Heavy coated electrode is normally suitable for

        (a) welding in flat position

        (b) deep groove joint in vertical position 

        (c) AC welding 

        (d) thick plates in any position 

        Ans. (a)

13. A.W.S. code of electrode starts with the letter E followed by 4-digit number . what do the first 2 digits represent?

        (a) Polarity 

        (b) welding  position 

        (c) type of flux coating 

        (d) Tensile strength of weld metal

        Ans.(d) 

14. A.W.S. code of electrode starts with the letter E followed by 4-digit number . what does the third digit represent digits represent?

        a) Polarity 

        (b) welding  position 

        (c) type of flux coating 

        (d) Tensile strength of weld metal

        Ans.(b)

15. What does the fourth digit indicate as per AWS electrode coding ?

        (a) Welding current

        (b) Welding  position 

        (c) Type of flux coating 

        (d) Tensile strength of weld metal

        Ans. (c)

16. In coding of electrodes , radiographic quality electrode is indicated by the letter 

        (a) A

        (b)X

        (C)Y

        (d) Z

        Ans. b

17. What does the letter "X" indicate in the electrode classification of EB 5426 H1 J X?

        (A) Covered electrode 

        (b) Increase metal recovery 

        (c) Hydrogen controlled electrode 

        (d) Radio graphic quality electrode 

        Ans. (d)

18.  What does the letter "J" indicate in the electrode coding of EB 5426 H1 J X?

        (a) Iron powder electrode with 130 to 149% recovery

        (b) Iron powder electrode with 110 to 129% recovery

        (c) Radiographic quality electrode

        (d) Low hydrogen electrode

        Ans. (b)

19.  What does the letter "K" indicate in the electrode coding of EB 5426 H1 K X?

        (a) Iron powder electrode with 130 to 149% recovery

        (b) Iron powder electrode with 110 to 129% recovery

        (c) Radiographic quality electrode

        (d) Low hydrogen electrode

          Ans. (a)

20. Which type of flux covered electrode is used to fusion welding of cast iron?

        (a) Basic type flux covered

        (b) Rutile type flux covered 

        (c) Cellulose type flux covered 

        (d) Iron oxide type flux covered

        Ans. (a)

21. For light coated electrodes, the coating factor is about -

        (a) 1

        (b) 1.4 to 1.6

        (c) 1.25 to 1.3

        (d) 1.6 to 2.2

        Ans. (c)

22. For medium coated electrodes, the coating factor is about -

        (a) 1

        (b) 1.4 to 1.6

        (c) 1.25 to 1.3

        (d) 1.6 to 2.2

        Ans. (b)

23. For heavy coated coated electrodes, the coating factor is about -

        (a) 1

        (b) 1.4 to 1.6

        (c) 1.25 to 1.3

        (d) 1.6 to 2.2

        Ans. (d)

24.What is the current range required for 3.15mm dia MS electrode in arc welding?

        (a) 40 - 50 A

        (b) 50 - 60 A

        (C) 60 - 80 A

        (d) 90 - 130 A

         Ans. (d)