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Free download in PDF Engineering Materials Short Questions & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
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
43
Annealing of white cast iron results in production of
[A]
malleable iron
[B]
nodular iron
[C]
spheroidal iron
[D]
grey 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
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
47
An important property of high silicon (12 – 18%) cast iron is the high
[A]
tenacity
[B]
brittleness
[C]
plasticity
[D]
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
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%
52
Maximum percentage of carbon in austenite is
[A]
0.025%
[B]
0.26%
[C]
0.8%
[D]
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
56
Depth of hardness of steel is increased by addition of
[A]
nickel
[B]
chromium
[C]
tungsten
[D]
vanadium
57
Railway rails are normally made of
[A]
mild steel
[B]
alloy steel
[C]
high carbon
[D]
tungsten steel
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%
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