Resistance welding (mcq types question and answer)

Definition,

                    Resistance welding is group of welding processes where in coalescence is produced by the heat obtained from resistance of work to the flow of electric current in a circuit of which the work is a part and by the application of pressure. No filler metal is needed.

    

                                    MCQ and Answer

1. Which one of the following is a resistance welding method?

       a) Spot welding 

       b) Thermit welding 

       c) Forge welding 

       d) Explosive welding

        

        Ans.:- (a)

2. What is the maximum power supply needed for the working of Spot welding process?

        a) 135 KVA

        b) 140 KVA

        c) 145 KVA

        d) 150 KVA

        Ans:- (d)

3. What is the minimum power supply needed for the working of Spot welding process?

        a) 10 KVA

        b) 14 KVA

        c) 6 KVA

        d) 22 KVA

        Ans:- (a)

4. Up to what thickness can steel be welded using Spot welding process?

        a) 10 mm

        b) 11 mm

        c) 12 mm

        d) 13 mm

        Ans:- (c)

5. Which of the following method is not used in applying pressure in spot welding process?

        a) Hand lever

        b) Foot lever

        c) Air pressure

        d) Hydraulic cylinder

        Ans:- (a)

6. How are the following metals to be welded connected to each other in spot welding?

        a) Electric contact

        b) Magnetic field

        c) Mechanical pressure

        d) Direct contact

        Ans:- (a)

7. In resistance welding, if the current is doubled, the heating effect becomes

        a) double

        b) four time

        c) eight time

        d) sixteen

        Ans:- (b)

8. In which of the following welding process heat and pressure is applied on the joint but no filler material or flux is added?

        a) Arc welding 

        b) Gas welding

        c) Thermit welding

        d) Resistance welding

        Ans:- (d)

9. Which of the following the welding process is used for welding of sheet metals in automobile and aircraft industries?

        a) Shield metal arc welding

        b) Thermit welding

        c)Gas tungsten arc welding

        d) Resistance welding 

        Ans :- (d)

10. The heat generated(H) in resistance welding is expressed by

        a) I²RT

        b) IR²T

        c) IRT²

          ^{d) 2IRT}

          ^{Ans:- (a)}

^{11. Which of the following is not a resistance welding?}

         ^{a) Spot welding}

         ^{b) Projection welding}

         ^{c) Flash Butt welding} 

         ^{d) Thermit welding}

        ^{Ans :- (d)}

^{12. The voltage needed in resistance welding does not depend upon}

        ^{a) Composition}

        ^{b) Area}

        ^{c) Thickness of weld}

        ^{d) Length of weld}

        ^{Ans:- (d)}

^{13. In electric resistance welding, two copper electrode used are cooled by-}

        ^{a) Water}

        ^{b) Air} 

        ^{c) Both (a) & (b)}

        ^{d) None of the above}

        ^{Ans :- (a)}

^{14. Welding of copper in resistance welding process is difficult because of its___}

        ^{a) High thermal conductivity} 

        ^{b) High electrical conductivity}

        ^{c) High toughness}

        ^{d) High ductility}

        ^{Ans :- (a)}

^{15. The voltage used in resistance welding is generally kept between}

        ^{a) 4- 12 volts}

        ^{b) 12- 20 volts}

        ^{c) 20 - 28 volts}

        ^{d) 28 - 36 volts}

        ^{Ans :- (a)}

^{16. In resistance welding, two electrode are made of.....}

        ^{a) Aluminium}

        ^{b) Copper}

        ^{c) Iron}

        ^{d) Bronze}

        ^{Ans :- (b)}

^{17. Which of the following is not a resistance welding?}

        ^{a) Spot welding} 

        ^{b) Butt welding} 

        ^{c) Pressure welding}

        ^{d) Percussion welding}

        ^{Ans :- (c)}

^{18. In spot welding, the spacing between two spot welds is.....}

        ^{a) 4t}

        ^{b) 8t}

        ^{c) 12t}

        ^{d) 16t}

        ^{Ans :- (c)}

^{19. The resistance welding process suitable for welding ferrous and non-ferrous metals upto 8mm thickness is...}

        ^{a) Spot welding}

        ^{b) Projection welding}

        ^{c) Butt welding}

        ^{d) Pressure welding}

        ^{Ans :- (a)}

^{20. In spot welding, the tip diameter of electrode is about}

            

1. √t
2. √2t
3. 2√t
4. √3t

    ^{Ans :- (1)} 

21. Which  resistance welding process is used for making continuous welds between two overlapping pieces of sheet metals?

        a) Projection welding 

        b) Seam welding

        c) Flash welding

        d) Percussion welding

        Ans:- (b)

22. In resistance welding, the current is not passed continuously in....

        a) Projection welding 

        b) Seam welding

        c) Flash welding

        d) Percussion welding

        Ans :- (b)

23. In which of following resistance welding, a large number of welds can be carried out simultaneously..

        a) Projection welding 

        b) Seam welding

        c) Spot welding

        d) Percussion welding

        Ans :- (a)

24. Which of the following resistance welding process, electrodes of two copper wheels are used

        a) Projection welding 

        b) Seam welding

        c) Spot welding

        d) Percussion welding

        Ans:- (b)

25. In projection welding the depth of projection is about.....

        a) 20% of sheet thickness

        b) 40% of sheet thickness

        c) 60% of sheet thickness

        d) 80% of sheet thickness

        Ans :- (c)

26. Up set welding is type of......

        a) arc welding

        b) resistance welding

        c) gas welding

        d) none of the above

        Ans :- (b)