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251.

In case of very hard surfaces the Brinell Hardness test method fails to give reliable results because

A.	Ball does not force into the metal	B.	Ball deforms on very hard surfaces
C.	Ball slips along the surface	D.	It is generally not desired to use this method in such cases
E.	None of the above

252.

In a Brinell hardness test the hardness number is determined by the measurement of

253.

In Rockwell hardness test the hardness is measured by

A.	The width of depression	B.	The depth of depression
C.	Diameter of depression	D.	None of the above

254.

Which of the following statements correct?

A.	Rockwell scale B in used for hard metals	B.	Rockwell scale C is used for hard metals
C.	Rockwell scale C is used for soft metals	D.	Rockwell scale A is used for hard metals

255.

In a shrink rule the graduations are

A.	Slightly longer than the regular graduations	B.	Same as regular graduations
C.	Slightly shorter than the regular graduations

256.

Which one of the following is not included in the combinations set?

257.

Which one of the following is known as trarmel?

A.	A pair of steel legs joined by a screw and nut	B.	A steel bar and two sliding legs which can be adjusted
C.	A divider with a spring	D.	None of the above

258.

Inside and outside diameters of a thin tube are to be measured. Only one of the following tools is to be selected. Which one would you choose?

259.

Which one of the following methods cannot be used for producing external threads?

A.	One lathe	B.	By dies
C.	By tap	D.	By rolling

260.

Which is not a part of shaper?

A.	Ram	B.	Tool head
C.	Table	D.	Cross slide