Mechanical Engineering MCQs

Page No. 39

The molecules in a solid move______________?


ain a random manner


bin a haphazard way


cin circular motion


dback and forth like tiny pendulums



Paramagnetic alpha iron changes to gamma iron at_______________?


a770°C


b910°C


c1440°C


d1539°C


View Answer 910°C

The crystal structure of gamma iron is_________________?


abody centred cubic


bface centred cubic


chexagonal close packed


dcubic structure


View Answer face centred cubic

The metallic structure of mild steel is_________________?


abody centred cubic


bface centred cubic


chexagonal close packed


dcubic structure


View Answer body centred cubic

The percentage of carbon in pig iron varies from___________________?


a0.1 to 1.2%


b1.5 to 2.5%


c2.5 to 4%


d4 to 4.5%


View Answer 4 to 4.5%

Pig iron is the name given to________________?


araw material for blast furnace


bproduct of blast furnace made by reduction of iron ore


ciron containing huge quantities of carbon


diron in molten form in the ladles



In nodular iron, graphite is in the form of_____________________?


acementite


bfree carbon


cflakes


dspheroids


View Answer spheroids

Wrought iron is________________?


ahard


bhigh in strength


chighly resistant to corrosion


dheat treated to change its properties



Pick up wrong statement about wrought iron ?


aIt contains carbon of the order of 0 to 0.25%


bIt melts at 1535°C


cIt is very soft and ductile


dIt is made by adding suitable percent¬age of carbon to molten iron and subjecting the product to repeated hammering and rolling



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


aallotropic change


brecrystallisation


cheat treatment


dprecipitation


View Answer allotropic change

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