3) Which of the following is/are true in case of resistance welding? A. Non-filler metal is required B. Similar and dissimilar metals can be welded Which of the above given is/are correct? Select the code for the correct answer from the options given below:

4) The filler material used in brazing operation is known as

5) The device used for holding wide works such as frames or tops is

6) The length of the Hand Vice varies from 125 mm to 150 mm and the width of the Jaw is from

7) The viscosity index is a measure of change in