Which of the following mainly decides the current to be employed is arc welding ?

Related Mcqs:

1. Projection welding & stud welding is categorised as the _______________ welding?

   A. Pressure
   B. Thermit
   C. Resistance
   D. Arc

2. Current employed in resistance welding ranges from ____________________ kVA/cm2?

   A. 1.2 to 2.5
   B. 4.5 to 6.2
   C. 7.5 to 8.5
   D. 10.5 to 15.5

3. Thermit welding is categorised as the ______________________ welding ?

   A. Forge
   B. Fusion
   C. Resistance
   D. Arc

4. Coating provided on the electrodes used in the arc welding is not expected to_________________?

   A. Add alloying elements
   B. Prevent electrode from contamination
   C. Stabilise the arc
   D. Provide protective atmosphere to weld

5. Thermit welding uses the following energy source ?

   A. Electrical energy
   B. Chemical energy
   C. Energy of high velocity electrons
   D. Heat generated by friction

6. Oxygen cylinders used for autogenous (cutting/welding) purposes are ___________________?

   A. Seamless & made of steel
   B. Heat treated before use
   C. Made by sand casting
   D. Welded steel cylinders

7. In TIG welding, thoriated tungsten electrodes are used, because it ____________________?

   A. Has higher current carrying capacity
   B. Has better electron emissivity
   C. Is stronger than ordinary tungsten
   D. Is easy to prepare

8. Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is ______________ Nm3 ?

   A. 0.5
   B. 1
   C. 1/3
   D. 2.5

9. The maximum thickness of the metal which can be welded using ultrasonic welding is _____________ mm ?

   A. 0.5
   B. 3
   C. 10
   D. 25

10. Consumable electrodes are used in the ____________________ welding?

    A. Gas
    B. Arc
    C. Thermit
    D. Resistance