Mechanical Engineering MCQs

Page No. 46

For the allotropic forms of iron, the points of arrest are __________________?


athe points where no further change oc-curs

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bconstant for all metals

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cthe points where there is no further flow of metal

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dthe points of discontinuity

✓



The crystal of alpha iron is ____________________?


abody centred cubic

✓


bface centred cubic

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chexagonal close packed

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dcubic structure

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View Answer body centred cubic

A reversible change in the atomic structure of steel with corresponding change in the properties is known as___________________?


amolecular change

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bphysical change

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callotropic change

✓


dsolidus change

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View Answer allotropic change

Ferromagnetic alpha iron exists in temperature range of________________?


abelow 723°C

✓


b770 – 910°C

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c910-1440°C

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d1400-1539°C

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View Answer below 723°C

The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is _______________?


a770°C

✓


b910°C

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c1050°C

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dbelow recrystallisation temperature

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View Answer 770°C

Which of the following constituents of steels is softest and least strong ________________?


aaustenite

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bpearlite

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cferrite

✓


dcementlte

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View Answer ferrite

A material is known as allotropic or polymorphic if it __________________?


ahas a fixed structure under all conditions

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bexists in several crystal forms at different temperatures

✓


cresponds to heat treatment

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dhas its atoms distributed in a random pattern

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Points of arrest for iron correspond to__________________?


astages at which allotropic forms change

✓


bstages at which further heating does not increase temperature for some time

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cstages at which properties do not change with increase in temperature

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dthere is nothing like points of arrest

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The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to l00°C will _________________?


aincrease

✓


bdecrease

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cremain same

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dfirst increase and then decrease

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View Answer increase

The ability of a material to resist softening at high temperature is known as____________________?


acreep

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bhot tempering

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chot hardness

✓


dfatigue

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View Answer hot hardness

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