Engineering Materials Quiz | Engineering Materials MCQs & Answers

Questions
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%

Answer: 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

Answer: 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

Answer: white metal
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
junior administrative assistant jaa test series