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Free download in PDF Engineering Materials MCQs & 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.
81
Tensile strength of steel can be safely in-creased by
[A]
adding carbon up to 2.8%
[B]
adding carbon up to 6.3%
[C]
adding carbon up to 0.83%
[D]
adding small quantities of copper
Answer: adding carbon up to 0.83%
82
High carbon steel carries carbon %age c
[A]
0.1 to 0.3%
[B]
0.3 to 0.6%
[C]
0.6 to 0.8%
[D]
0.8 to 1.5%
83
Constantant an alloy used in thermocouples is an alloy of
[A]
copper and tin
[B]
copper and zinc
[C]
copper and iron
[D]
copper and nickel
Answer: copper and nickel
84
Addition of silicon to aluminium results in
[A]
improvement of casting characteristics
[B]
improvement of corrosion resistance
[C]
one of the best known age and precipitation-hardening systems
[D]
improving machinability
Answer: improvement of casting characteristics
85
Addition of lead and bismuth to aluminium results in
[A]
improvement of casting characteristics
[B]
improvement of corrosion resistance
[C]
one of the best known age and precipitation-hardening systems
[D]
improving machinability
Answer: improving machinability
86
Which of the following alloys does not have copper as one of the constituents
[A]
delta metal
[B]
monel metal
[C]
constantan
[D]
nichrome
87
Addition of manganese to aluminium results in
[A]
improvement of casting characteristics
[B]
improvement of corrosion resistance
[C]
one of the best known age and precipitation-hardening systems
[D]
improving machinability
Answer: improvement of corrosion resistance
88
Addition of copper to aluminium results in
[A]
improvement of casting characteristics
[B]
improvement of corrosion resistance
[C]
one of the best known age and precipitation-hardening systems
[D]
improving machinability
Answer: one of the best known age and precipitation-hardening systems
89
Which is false statement about properties of aluminium
[A]
modulus of elasticity is fairly low
[B]
wear resistance is very good
[C]
fatigue strength is not high
[D]
creep strength limits its use to fairly low temperatures
Answer: wear resistance is very good
90
Which of the following alloys does not contain tin
[A]
white metal
[B]
solder admiralty
[C]
fusible metal
[D]
phosphor bronze
91
Admiralty gun metal contains
[A]
63 to 67% nickel and 30% copper
[B]
88% copper, 10% tin and rest zinc
[C]
alloy of tin, lead and cadmium
[D]
iron scrap and zinc
Answer: 88% copper, 10% tin and rest zinc
92
Delta metal is an alloy of
[A]
copper, zinc and iron
[B]
iron, nickel and copper
[C]
iron, lead and tin
[D]
iron, aluminium and magnesium
Answer: copper, zinc and iron
93
Free cutting steels
[A]
are used where ease in machining is the criterion
[B]
contain carbon in free form
[C]
require least cutting force
[D]
do not exist
Answer: are used where ease in machining is the criterion
94
Phosphor bronze contains
[A]
0.5% of phosphorous
[B]
1% phosphorous
[C]
2.5% phosphorous
[D]
none of the above.
Answer: none of the above.
95
Permalloy is a
[A]
kind of stainless steel
[B]
none ferrous alloy
[C]
polymer
[D]
nickel and iron alloy having high permeability
Answer: nickel and iron alloy having high permeability
96
Monel metal contains
[A]
63 to 67% nickel and 30% copper
[B]
88% copper and 10% tin and rest zinc
[C]
alloy of tin, lead and cadmium
[D]
malleable iron and zinc
Answer: 63 to 67% nickel and 30% copper
97
Perminvar alloy having constant permeability is an alloy of
[A]
nickel, copper and iron
[B]
nickel, copper and zinc
[C]
copper, nickel and antimony
[D]
iron, zinc and bismuth
Answer: nickel, copper and iron
98
Gun metal contains
[A]
70% copper and 30% zinc
[B]
90% copper and 10% tin
[C]
85-92% copper and rest tin with little lead and nickel
[D]
70-78% copper and rest tin
Answer: 85-92% copper and rest tin with little lead and nickel
99
Bronze contains
[A]
70% copper and 30% zinc
[B]
90% copper and 10% tin
[C]
85-92% copper and rest tin with little lead and nickel
[D]
70-75% copper and rest tin
Answer: 90% copper and 10% tin
100
The correct sequence for descending order of machinability is
[A]
grey cast iron, low carbon steel, wrought iron
[B]
low carbon steel, grey cast iron, wrought iron
[C]
wrought iron,low carbon steel, grey cast iron
[D]
wrought iron, grey cast iron, low carbon steel
Answer: grey cast iron, low carbon steel, wrought iron
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