WELDING - Practice Mode

1) Which factor determines the current setting during welding?

Types of joint Position of weld Length of electrode Diameter of electrode

Correct Answer: Diameter of electrode

2) What is the fault if excess deposit of tiny metal globules formed on the job surface along weld?

Incomplete penetration Slag inclusion Blow hole Spatters

Correct Answer: Spatters

3) Why the acetylene gas is avoided with copper pipe lines or fittings in oxy-acetylene welding set?

Copper is expensive Copper is not flexible hose Copper and acetylene form explosive Copper pipe consumes more acetylene

Correct Answer: Copper and acetylene form explosive

Explanation:

Alternating current changes its direction and magnitude number of times per seconds.

4) Why the filler metal does not melt and flow into the joint in bronze welding of copper?

Excess use of flux Due to excess of polished surface Surface coated with oxides or oily material Excessive heating of metal s surface

Correct Answer: Surface coated with oxides or oily material

5) What is the precautionary measure taken if flame snaps out and back fires?

Shut off both valve quickly and dip in water Shut off oxygen first and acetylene next Shut off acetylene first, oxygen next and dip in water Shut off both valve, oxygen first and dip in water

Correct Answer: Shut off acetylene first, oxygen next and dip in water

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