Mechanical Engineering MCQs

Page No. 38

Slow plastic defomiation of metals under a constant stress is known as________________?


acreep


bfatigue


cendurance


dplastic deformation


View Answer creep

The number of electrons in 1 cm3 of metal would be of the order of_______________?


a1010


bTO16


c1022


d1040


View Answer 1022

The elastic stress strain behaviour of rubber is_____________________?


alinear


bnon-linear


cplastic


dno fixed relationship


View Answer non-linear

Recrystallization temperature is one________________?


aat which crystals first start forming from molten metal when it is cooled


bat which new spherical crystals first begin to form from the old deformed one when a strained metal is heated


cat which change of allotropic form takes place


dat which crystals grow bigger in size



Delta iron occurs at temperature of_______________?


aroom temperature


babove melting point


cbetween 1400°C and 1539°C


dbetween 910°C and 1400°C



Super conduction by metals is observed in the temperature range of_________________?


abelow 10°K


babove 100°K


caround 0°C


daround 100°C


View Answer below 10°K

Which of the following represents the allotropic forms of iron__________________?


aalpha iron, beta iron and gamma iron


balpha iron and beta iron


cbody centred cubic a-iron and face centred cubic a-iron


dalpha iron, gamma from and delta iron



Gamma iron exits at following temperature___________________?


aroom temperature


bnear melting point


cbetween 1400°C and 1539°C


dbetween 910°C and 1400°C



Pure iron is the structure of_______________?


aferrite


bpearlite


canstenite


dferrite and cementite


View Answer ferrite

Cast iron is characterised by minimum of following %age of carbon_________________?


a0.2%


b0.8%


c1.3%


d2%


View Answer 2%

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