13) In gas welding, the gas mixture used is

Oxygen-hydrogen

Oxygen-propane

Oxygen-Acetylene

Oxygen-coal gas

Answer is:

Oxygen-Acetylene

ISRO Technician-B Fitter Question Paper - 2015 (Set - 1) with Answer Key

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14) Which one of the following process does not require filler metal

Arc welding

Resistance welding

Gas welding

None of these

Answer is:

Resistance welding

15) Which of the following material has maximum brittleness

Stainless steel

Cast iron

Mild steel

Copper

Answer is:

Cast iron

16) A jig used for

Holding and guiding the tool

Holding the job

Setting the work piece on the machine

Easy movement of the job

Answer is:

Holding and guiding the tool

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.

A fixture is a work-holding device that only holds, supports, and locates the workpiece, but does not guide the tools to perform a specific operation.