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331.

Which of the following operations is known as 'sweating'

A.	Tinning the two surfaces to be joined, applying flux and heating	B.	Heating two surfaces to be joined, to the high temperature in presence of flux
C.	Heating two surfaces at low temperature	D.	Joining of two surfaces without use of flux
E.	None of the above

332.

Thermit welding differs from other methods of welding in the following way:

A.	It does not use heat	B.	It employs exothermal chemical reaction for developing high temperature
C.	It is less time consuming	D.	It does not require electrodes
E.	None of the above

333.

In which type of welding molten metal is poured for joining the metals

334.

The range of voltage (open circuit) in are welding is generally

335.

In gas welding using oxygen and acetylene cylinders the pressure of gas is more in

A.	Oxygen cylinder	B.	Aetylene cylinders
C.	Equal in both cylinders

336.

In electrical resistance welding when the current passes through the metal, the greatest resistance is

A.	At the surface	B.	Through the metals to be welded
C.	At the point of contact of the metal to be welded	D.	At the point where electrode contacts the metal
E.	None of the above

337.

In electrical resistance welding cleaning of metals to be welded

A.	Is immaterial	B.	Is important
C.	Can be neglected	D.	Does not have any effect on the welding
E.	None of the above

338.

In manufacturing ERW tube the type of welding generally used is

A.	Are welding	B.	Electrical resistance welding
C.	Gas welding	D.	Induction welding
E.	Thermit welding

339.

Two 3 mm thick MS sheets are to be welded. Electrodes of 16, 12, 10 Nos, are available which one would you choose.

340.

Plain and butt welds may be used on materials upto approximately