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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