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351.

Grey iron is usually welded by

352.

In thermit welding, heat is generated by

A.	Combustion of gases	B.	Electric arc
C.	Reaction of oxygen with metal	D.	Chemical reaction involving finely divided aluminium and iron oxide
E.	None of the above

353.

In ultrasonic welding the frequency range is generally

354.

Oxygen cylinders are

A.	Cast iron cylinders	B.	Steel cylinders, welded structure
C.	Die cast	D.	Seamless steel cylinders
E.	Alloy steel cylinders, thermit welded

355.

The chemical used in generating acetylene is

356.

Weld spatter is

A.	A flux	B.	A filler material used in gas welding
C.	A filler material used in soldering	D.	An electrode used in inert atmosphere
E.	A welding defect

357.

Which of the following welding process uses consumable electrodes

358.

Arc blow is a welding defect which is encountered

A.	In arc welding using a.c. current	B.	In arc welding using d.c. current
C.	In gas welding	D.	In thermit welding
E.	In MIG welding

359.

In a power hacksaw machine blade the number of teeth per inch are generally

360.

A 30 ton press means

A.	Gross weight of the press is 30 tons	B.	The weight of die is 30 tons
C.	The pressure exerted by slide is 30 tons	D.	The flywheel of the press weighs 30 tons
E.	The quantity of work produced in 8 hours will be 30 tons