Engineering Materials Quiz | Engineering Materials Short Questions & Answers

Questions
41 Gamma iron exits at following temperature
A room temperature
B near melting point
C between 1400°C and 1539°C
D between 910°C and 1400°C

Answer: between 910°C and 1400°C
42 Ferromagnetic alpha iron exists in temperature range of
A below 723°C
B 770 – 910°C
C 910-1440°C
D 1400-1539°C

Answer: below 723°C
43 Annealing of white cast iron results in production of
A malleable iron
B nodular iron
C spheroidal iron
D grey iron

Answer: malleable iron
44 Carbon steel is
A made by adding carbon in steel
B refined from cast iron
C an alloy of iron and carbon with varying quantities of phosphorus and sulphur
D extensively used for making cutting tools

Answer: an alloy of iron and carbon with varying quantities of phosphorus and sulphur
45 Steel contains
A 80% or more iron
B 50% or more iron
C alloying elements like chromium, tungsten nickel and copper
D elements like phosphorus, sulphur and silicon in varying quantities

Answer: 50% or more iron
46 An important property of malleable cast iron in comparison to grey cast iron is the high
A compressive strength
B ductility
C carbon content
D hardness

Answer: ductility
47 An important property of high silicon (12 – 18%) cast iron is the high
A tenacity
B brittleness
C plasticity
D hardness

Answer: hardness.
48 In mottled cast iron, carbon is available in
A free form
B combined form
C nodular form
D partly in free and partly in combined state

Answer: partly in free and partly in combined state
49 White cast iron contains carbon in the form of
A free carbon
B graphite
C cementite
D white carbon

Answer: cementite
50 Cast iron has
A high tensile strength
B its elastic limit close to the ultimate breaking strength
C high ductility
D all of the above

Answer: its elastic limit close to the ultimate breaking strength
51 Maximum percentage of carbon in ferrite is
A 0.025%
B 0.06%
C 0.1%
D 0.25%

Answer: 0.025%
52 Maximum percentage of carbon in austenite is
A 0.025%
B 0.26%
C 0.8%
D 1.7%

Answer: 1.7%
53 Corrosion resistance of steel is increased by addition of
A chromium and nickel
B sulphur, phosphorus, lead
C vanadium, aluminium
D tungsten, molybdenum, vanadium, chromium

Answer: chromium and nickel
54 In which of the following cases, consideration of creep is important
A flywheel of steam engine
B cast iron pipes”
C cycle chains
D gas turbine blades

Answer: gas turbine blades
55 The most effective inhibitor of grain growth, when added in small quantities is
A carbon
B vanadium
C manganese
D cobalt

Answer: vanadium
56 Depth of hardness of steel is increased by addition of
A nickel
B chromium
C tungsten
D vanadium

Answer: chromium
57 Railway rails are normally made of
A mild steel
B alloy steel
C high carbon
D tungsten steel

Answer: high carbon
58 Pick up the wrong statement Nickel and chromium in steel help in
A providing corrosion resistance
B improving machining properties
C providing high strength at elevated temperatures
D raising the elastic limit

Answer: improving machining properties
59 Machining properties of steel are improved by adding
A sulphur, lead, phosphorous
B silicon, aluminium, titanium
C vanadium, aluminium
D chromium, nickel

Answer: sulphur, lead, phosphorous
60 Eutectoid steel contains following percentage of carbon
A 0.02%
B 0.3%
C 0.63%
D 0.8%

Answer: 0.8%
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