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


bconstant for all metals


cthe points where there is no further flow of metal


dthe points of discontinuity



The crystal of alpha iron is ____________________?


abody centred cubic


bface centred cubic


chexagonal close packed


dcubic structure


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


bphysical change


callotropic change


dsolidus change


View Answer allotropic change

Ferromagnetic alpha iron exists in temperature range of________________?


abelow 723°C


b770 – 910°C


c910-1440°C


d1400-1539°C


View Answer below 723°C

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


a770°C


b910°C


c1050°C


dbelow recrystallisation temperature


View Answer 770°C

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


aaustenite


bpearlite


cferrite


dcementlte


View Answer ferrite

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


ahas a fixed structure under all conditions


bexists in several crystal forms at different temperatures


cresponds to heat treatment


dhas its atoms distributed in a random pattern



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


cstages at which properties do not change with increase in temperature


dthere is nothing like points of arrest



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


aincrease


bdecrease


cremain same


dfirst increase and then decrease


View Answer increase

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


acreep


bhot tempering


chot hardness


dfatigue


View Answer hot hardness

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