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211.

The hardness of martensite in quenched plain carbon steels reaches almost a saturation value of carbon of about

212.

Railway rails are generally made of

A.	Deam mild steel	B.	Mild steel
C.	Medium carbon steel	D.	High carbon steel
E.	Alloys steel containing 0.8 to 0.9% carbon

213.

Paper cutting knives steel contains carbon percentage

214.

C-14 steel indicates plain carbon steel containing carbon percentage

215.

2% Nickel in steel makes it suitable for

A.	Boiler plates, rivets etc	B.	Connecting rods
C.	Turbine blade	D.	Anti corrosion characteristics
E.	Electronic valves

216.

In ball bearing steels, chromium percentage is normally in the range

217.

Accuracy is

A.	The repeatability of a measuring process	B.	Error of judgment in recording an observation
C.	The ability of an instrument to reproduce same reading under identical situations	D.	Agreement of the result of a measurement with the true value of the measured quantity
E.	None of the above

218.

Which one of the following is supposed to be least accurate?

219.

Precision is

A.	The repeatability of a measurement process	B.	Agreement of the result of a measurement with the true value of the measured quantity
C.	The ability of a measuring device to detect small differences in a quantity being measured	D.	The ability of an instrument to reproduce same reading under identical conditions
E.	Error of judgment in reading on observation

220.

Which one of the following measuring instruments is supposed to be most accurate?