Engineering Materials objective questions with answers part9

Q1. Bronze contains
(A) 70% copper and 30% zinc
(B) 90% copper and 10% tin
(C) 70-75% copper and rest tin
(D) 90% copper and 10% zinc.

Q2. Muntz metal contains copper and zinc in the ratio of
(A) 50:50:00
(B) 41:00:00
(C) 60:40:00
(D) 31:10:00

Q3. 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

Q4. 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

Q5. The alloy used for making electrical resistances and heating elements is
(A) nichrome
(B) invar
(C) magnin
(D) elinvar

Q6. 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

Q7. Permalloy is a
(A) kind of stainless steel
(B) polymer
(C) cutting tool material
(D) nickel and iron alloy having high permeability

Q8. 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) can be cut freely even under adverse conditions.

Q9. Delta metal is an alloy of
(A) copper, zinc and iron
(B) iron, nickel and copper
(C) iron, aluminium and magnesium
(D) copper, zinc and antimony.

Q10. 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

Q11. Which of the following alloys does not contain tin
(A) white metal
(B) solder admiralty
(C) fusible metal
(D) phosphor bronze

Q12. 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) corrosion resistance is good

Q13. 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

Q14. 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

Q15. Elinvar, an alloy used in precision instruments, hair springs for watches, etc. contains the following element as principal alloying element
(A) iron
(B) copper
(C) aluminium
(D) nickel

Q16. Which of the following alloys does not have copper as one of the constituents
(A) delta metal
(B) monel metal
(C) constantan
(D) nichrome

Q17. 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

Q18. 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

Q19. Constantant, an alloy used in thermocouples is an alloy of
(A) copper and tin
(B) copper and zinc
(C) copper and nickel
(D) copper and chromium.

Q20. White metal contains
(A) 63 to 67% nickel and 30% copper
(B) alloy of tin, lead and cadmium
(C) silver and chromium
(D) malleable cast iron and silver

Q21. German silver contains
(A) 12% silver
(B) 2.5% silver
(C) 0% silver
(D) 30% silver

Q22. Which of the following has highest specific strength of all structural materials
(A) magnesium alloys
(B) titanium alloys
(C) chromium alloys
(D) magnetic steel alloys

Q23. Dow metal contains
(A) 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
(B) 90% aluminium and 90% copper
(C) 90% magnesium and 9% aluminium with some copper
(D) 90% magnesium and 10% tin.

Q24. Foundry crucible is made of
(A) mild steel
(B) german silver
(C) cast iron
(D) graphite

Q25. Age-hardening is related with
(A) stainless steel
(B) gun metal
(C) duralumin
(D) cast iron