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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