Mechanical Engineering MCQs

Page No. 45

An important property of high silicon (12 – 18%) cast iron is the high__________________?


atenacity


bbrittleness


cplasticity


dhardness


View Answer hardness

White cast iron contains carbon in the form of__________________?


afree carbon


bgraphite


ccementite


dwhite carbon


View Answer cementite

Chilled cast iron has____________________?


ano graphite


ba very high percentage of graphite


ca low percentage of graphite


dgraphite as its basic constituent of composition


View Answer no graphite

Iron is ____________________?


aparamagnetic


bferromagnetic


cferroelectric


ddielectric


View Answer ferromagnetic

Sulphur in pig iron tends to make it___________________?


ahard


bsoft


cductile


dtough


View Answer hard

The following types of materials are usually the most ductile__________________?


aface-centred cubic lattice


bbody-centred cubic lattice


chexagonal close-packed lattice


dall of the above



In malleable iron, carbon is present in the form of___________________?


acementite


bfree carbon


cflakes


dnodular aggregates of graphite



In grey cast iron, carbon is present in the form of____________________?


acementite


bfree carbon


cflakes


dspheroids


View Answer flakes

The unique property of cast iron is its high ___________________?


amalleability


bductility


csurface finish


ddamping characteristics



The percentage of carbon in grey iron castings usually varies between __________________?


a0.5 to 1%


b1 – 2%


c2.5 to 4.5%


d5 – 7%


View Answer 2.5 to 4.5%

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