CTSWLD: Assignment 2

Assignment 2 - Week 4

1.The resistance of the arc

•Decrease with an increase of the current

•Increases with increases of the current

•Does not depends on current

•None of the above

2. In arc welding, once the arc is struck, the voltage required to maintain the arc will be

•20-30 V

•100-120 V

•200-220 V

•500-1000 V

3. As the thickness of the part to be welded decreases, which of the following parameter for ac welding should also decrease?

•Voltage

•Current

•Frequency

•All of the above

4 Heat is measured in -

•Joule

•Calorie

•both of the above

•Joule/second

5. With the increase in temperature, heat will be

• increase

•constant

•decrease

•double

1.Describe the principal of Arc welding?

2.Explain drooping and flat characteristics of arc?

3.Convert 980 C to 0F ?

4.Explain current, voltage and resistance and also explain about Ohm’s law?

5.What are the insulators and conductors, explain with examples?