Engineering Materials Quiz | Engineering Materials Multiple Choice Questions(MCQs) with Answers

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Questions
61 Hardness of martensite is about
A RC 65
B RC 48
C RC 57
D RC 80

Answer: RC 65
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

Answer: 1000 to 1100 VPN
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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

Answer: tin and copper
68 By severely deforming a metal in a particular direction it becomes
A ductile
B malleable
C homogeneous
D anisotropic

Answer: 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

Answer: 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

Answer: nickel, copper
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

Answer: RC 57
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-

Answer: 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

Answer: line defect
79 An example of amorphous material is
A zinc
B lead
C silver
D glass

Answer: glass
80 Which is false statement about case hardening. Case hardening is done by
A electroplating
B cyaniding
C induction hardening
D nitriding

Answer: electroplating

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