Engineering Materials - Mechanical Engineering Questions and Answers

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The percentage of phosphorus is phosphor bronze is

0.1

11.1

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In high speed steels, vanadium adds to the property of red hardness and tungsten and chromium add to high wear resistance.

True

False

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For the pipe fitting like elbow, tee, union etc., which of the following is preferred?

Pig iron

Malleable iron

Spheroidal graphite cast iron

High carbon steel

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Chilled cast iron is produced

by adding magnesium to molten cast iron

by quick cooling of molten cast iron

from white cast iron by annealing process

none of these

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Silicon is added in low carbon steels to

make the steel tougher and harder

make the steel of good bending qualities

raise the yield point

all of these

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According to Indian standard specifications, cast iron designated by 'FG 150' means

white cast iron with B.H.N. 150

white cast iron with 150 MPa as minimum compressive strength

grey cast iron with B.H.N. 150

grey cast iron with 150 MPa as minimum tensile strength

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The red flame during the operation of a bessemer converter indicates that the

air is burning out silicon and manganese

silicon and manganese has burned out and carbon has started oxidising

converter must be tilted to remove the contents of the converter

red flame does not occur during the operation of a bessemer converter

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Phosphor bronze has

high resistance to corrosion

good wearing qualities and high elasticity

valuable cold working property

all of these

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In the austempering process of heat treatment, austenite changes into

martensite

troostite

sorbite

bainite