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191.

Which of the following operations improve wear resistance and mechanical properties of castings?

A.	Shot peening	B.	Chilling
C.	Nitriding	D.	All of the above

192.

Aluminium castings are not repaired by

A.	inert gas metal arc welding	B.	braze welding
C.	soldering	D.	All of the above

193.

Warped castings may be produced due to

A.	poor collapsibility of cores	B.	non-provision of camber allowance on the pattern
C.	weak flasks	D.	any of the above

194.

Swelling of castings may occur due to

A.	insufficient ramming	B.	rapid pouring of molten metal
C.	insufficient weight on the moulds during pouring	D.	any of the above

195.

Which of the following holes appear on the surface of the casting when it is machined?

A.	Blow holes	B.	Pin holes
C.	Gas holes	D.	Slag holes

196.

Shrinkage cavity in a casting may be formed due to

A.	haphazard solidification of metal	B.	improperly sized gating
C.	high pouring temperatures	D.	any of the above

197.

A defect in castings in which a discontinuity is formed due to the imperfect fusion of two streams of metal in the mould cavity is known as

A.	hot tears	B.	cold shut
C.	scabs	D.	drops

198.

All of the following are non-destructive method of testing the castings EXCEPT:

A.	Pressure test	B.	Ultrasonic test
C.	Tensile test	D.	Dye penetrant inspection

199.

Which of the following test on castings is based on sound?

A.	Impact test	B.	Percussion test
C.	Radiographic	D.	Magnetic particle inspections

200.

In radiography test on castings which of the following rays are never used?

A.	X-rays	B.	beta rays
C.	gamma rays	D.	all of the above