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Free download in PDF Engineering Materials Multiple Choice Questions(MCQs) with 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.
61
Hardness of martensite is about
[A]
RC 65
[B]
RC 48
[C]
RC 57
[D]
RC 80
62
The surface hardness of the following order is achieved by nitriding operation
[A]
600 VPN
[B]
1500 VPN
[C]
1000 to 1100 VPN
[D]
250 VPN
63
Process of austempering results in
[A]
formation of bainite structure
[B]
carburised structure
[C]
martenistic structure
[D]
lamellar layers of carbide distributed throughout the structure
Answer: formation of bainite structure
64
The loss of strength in compression with simultaneous gain in strength in tension due to overloading is known as
[A]
hysteresis
[B]
creep
[C]
visco elasticity
[D]
Boeschinger effect
Answer: Boeschinger effect
65
Induction hardening is the process of
[A]
hardening surface of workpiece to ob-tain hard and wear resistant surface
[B]
heating and cooling rapidly
[C]
increasing hardness throughout
[D]
inducing hardness by continuous process
Answer: hardening surface of workpiece to ob-tain hard and wear resistant surface
66
Cyaniding is the process of
[A]
dipping steel in cyanide bath
[B]
reacting steel surface with cyanide salts
[C]
adding carbon and nitrogen by heat treatment of steel to increase its surface hardness
[D]
obtaining cyanide salts
Answer: adding carbon and nitrogen by heat treatment of steel to increase its surface hardness
67
Solder is an alloy consisting of
[A]
tin, antimony, copper
[B]
tin and copper
[C]
tin and lead
[D]
lead and zinc
68
By severely deforming a metal in a particular direction it becomes
[A]
ductile
[B]
malleable
[C]
homogeneous
[D]
anisotropic
69
Inconel is an alloy of
[A]
nickel, chromium and iron
[B]
nickel, copper
[C]
nickel, chromium
[D]
nickel, zinc
Answer: nickel, chromium and iron
70
An engineer’s hammer is made of
[A]
cast iron
[B]
forged steel
[C]
mild steel
[D]
high carbon steel
Answer: high carbon steel
71
A cold chisel is made of
[A]
mild steel
[B]
cast iron
[C]
H.S.S.
[D]
high carbon
72
German silver is an alloy of
[A]
silver and some impurities
[B]
refined silver
[C]
nickel, copper and zinc
[D]
nickel and copper
Answer: nickel, copper and zinc
73
Basic constituents of Monel metal are
[A]
nickel, copper
[B]
nickel, molybdenum
[C]
zinc, tin, lead
[D]
nickel, lead and tin
74
The basic constituents of Hastelloy are
[A]
aluminium, copper etc.
[B]
nickel, molybdenum etc.
[C]
nickel, copper, etc.
[D]
all of the above
Answer: nickel, molybdenum etc.
75
Hardness of lower bainite (tempered martensite) is about
[A]
RC 65
[B]
RC 48
[C]
RC 57
[D]
RC 80
76
Which is false statement about normalizing. Normalizing is done to
[A]
refine grain structure
[B]
reduce segregation in casting
[C]
improve mechanical properties
[D]
induce stresses-
77
Vanadium in high speed steels
[A]
promotes decarburisation
[B]
provides high hot hardness
[C]
forms very hard carbides and thus in-creases wear resistance
[D]
promotes retention of austenite
Answer: forms very hard carbides and thus in-creases wear resistance
78
Dislocations in materials refer to the following type of defect
[A]
point defect
[B]
line defect
[C]
plane defect
[D]
volumetric defect
79
An example of amorphous material is
[A]
zinc
[B]
lead
[C]
silver
[D]
glass
80
Which is false statement about case hardening. Case hardening is done by
[A]
electroplating
[B]
cyaniding
[C]
induction hardening
[D]
nitriding
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