Engineering Materials Quiz | Engineering Materials Objective Type Questions & Answers

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Questions
21 A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as
A allotropic change
B recrystallisation
C heat treatment
D precipitation

Answer: allotropic change
22 Iron is
A paramagnetic
B ferromagnetic
C ferroelectric
D dielectric

Answer: ferromagnetic
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23 Pick up wrong statement about wrought iron
A It contains carbon of the order of 0 to 0.25%
B It melts at 1535°C
C It is very soft and ductile
D It is made by adding suitable percent¬age of carbon to molten iron and subjecting the product to repeated hammering and rolling.

Answer: It is made by adding suitable percent¬age of carbon to molten iron and subjecting the product to repeated hammering and rolling.
24 Sulphur in pig iron tends to make it
A hard
B ductile
C tough
D soft

Answer: hard
25 Wrought iron is
A hard
B high in strength
C highly resistant to corrosion
D heat treated to change its properties

Answer: highly resistant to corrosion
26 In malleable iron, carbon is present in the form of
A cementite
B free carbon
C flakes
D nodular aggregates of graphite

Answer: nodular aggregates of graphite
27 In nodular iron, graphite is in the form of
A cementite
B free carbon
C flakes
D spheroids

Answer: spheroids
28 In grey cast iron, carbon is present in the form of
A cementite
B free carbon
C flakes
D spheroids

Answer: flakes
29 Cast iron is characterised by minimum of following %age of carbon
A 2%
B 1.3%
C 0.8%
D 0.2%

Answer: 2%
30 The unique property of cast iron is its high
A malleability
B ductility
C surface finish
D damping characteristics

Answer: damping characteristics
31 Pig iron is the name given to
A raw material for blast furnace
B product of blast furnace made by reduction of iron ore
C iron containing huge quantities of carbon
D iron in molten form in the ladles

Answer: product of blast furnace made by reduction of iron ore
32 The percentage of carbon in grey iron castings usually varies between
A 0.5 to 1%
B 1 – 2%
C 2.5 to 4.5%
D 5 – 7%

Answer: 2.5 to 4.5%
33 The percentage of carbon in pig iron varies from
A 0.1 to 1.2%
B 1.5 to 2.5%
C 2.5 to 4%
D 4 to 4.5%

Answer: 4 to 4.5%
34 For the allotropic forms of iron, the points of arrest are
A the points where no further change oc-curs
B constant for all metals
C the points where there is no further flow of metal
D the points of discontinuity

Answer: the points of discontinuity
35 The metallic structure of mild steel is
A body centred cubic
B face centred cubic
C hexagonal close packed
D cubic structure

Answer: body centred cubic
36 The crystal of alpha iron is
A body centred cubic
B face centred cubic
C hexagonal close packed
D cubic structure

Answer: body centred cubic
37 The crystal structure of gamma iron is
A body centred cubic
B face centred cubic
C hexagonal close packed
D cubic structure

Answer: face centred cubic
38 The molecules in a solid move
A in a random manner
B in a haphazard way
C in circular motion
D back and forth like tiny pendulums

Answer: back and forth like tiny pendulums
39 A reversible change in the atomic structure of steel with corresponding change in the properties is known as
A molecular change
B physical change
C allotropic change
D solidus change

Answer: allotropic change
40 Paramagnetic alpha iron changes to gamma iron at
A 770°C
B 910°C
C 1440°C
D 1539°C

Answer: 910°C

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