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251.

A cold short metal is

A.	One that can not be heated above 500?C	B.	One that cannot be welded
C.	One that cannot be worked under the hammer or by rolling or bent when cold without racking at the edges	D.	One that cannot be easily rolled or bent at low temperatures
E.	None of the above

252.

A hot short metal is

A.	Brittle when heated	B.	Brittle when cold
C.	Ductile at low temperatures	D.	Ductile at high temperatures
E.	None of the above

253.

Resilience is the property of materials in which

A.	Materials resist deformation	B.	Materials spring back or recoil when pressure is removed
C.	Materials are easily deformed	D.	Materials can be easily pressed
E.	None of the above

254.

Tenacity is the property of materials in which they

255.

Isolate the factor on which bursting pressure of boiler does not depend

A.	Tensile strength of the shell	B.	Thickness of the shell
C.	Diameter of the shell	D.	Shear strength of shell material

256.

Working pressure of a boiler does not depend upon

257.

Boilers using Bagasse as fuel use

258.

Steam trap is a device that

A.	Allows passage of water but prevents the passage of steam	B.	Allows passage of air but prevents passage of steam
C.	Allows passage of the flue gases but prevents flow of steam	D.	None of the above

259.

Temporary hardness of water is caused by

A.	Bicarbonates of calcium and magnesium	B.	Sulphates of calcium and magnesium
C.	Chlorides of calcium and magnesium	D.	Nitrates of calcium and magnesium
E.	None of the above

260.

Direction of feed water is done because

A.	It reduces weight of water to be handled	B.	It reduced priming difficulties in feed pumps
C.	It reduces corrosion caused by oxygen present in air	D.	It reduces amount of heat required to convert water into steam
E.	None of the above