Answer is:

Jig

Explanation:

A jig is a work-holding device that holds, supports, and locates the workpiece and guides the one or more tools to perform a specific operation.

Which one of the following is used to guide the tool and hold the job in mass production ?

2) Which one of the following is used to clamp the job in relation to the tool in mass production ?

Answer is:

Fixture

Explanation:

Fixtures are the work holding devices, which holds, supports and locates the workpiece but not guides the cutting tool to perform a specific operation.

Which one of the following is used to clamp the job in relation to the tool in mass production ?

3) Which one of the following device is used for the convenience of fabrication of a job by welding which is set in this device so that it can be swiveled around 360 Degree as per requirement ?

Answer is:

Fixture

Explanation:

Fixture is used for the convenience of fabrication of a job by welding which is set in this device so that it can be swiveled around 360 Degree as per requirement.

Which one of the following device is used for the convenience of fabrication of a job by welding which is set in this device so that it can be swiveled around 360 Degree as per requirement ?

4) Usually drill jig is not clamped to the drilling machine table. Which among the following is the reason for this ?

Answer is:

It is rigid enough for this operation

Explanation:

Usually drill jig is not clamped to the drilling machine table because, it is rigid enough for this operation.