Engineering Materials objective questions with answers part8

Q1. Aluminium bronze contains
(A) 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
(B) 10% aluminium and 90% copper
(C) 90% magnesium and 9% aluminium with some copper
(D) 30% aluminium and 70% tin.

Q2. The correct composition of Babbit metal is
(A) 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi
(B) 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg
(C) 87% Sn, 4% Cu, 8% Sb, 1% Al
(D) 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg

Q3. DuraJomin contains
(A) 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
(B) 92.5% aluminium, 40% copper, 2% nickel, and 1.5% Mg
(C) 10% aluminium and 90% copper
(D) 90% magnesium and 9% aluminium with some copper

Q4. Neutral solution is one which has pH value
(A) greater than 7
(B) less than 7
(C) equal to 7
(D) pH value has nothing to do with neutral solution

Q5. Acidic solution is one which has pH value
(A) greater than 7
(B) less than 7
(C) equal to 7
(D) pH value has nothing to do with neutral solution

Q6. Basic solution is one which has pH value
(A) greater than 7
(B) equal to 7
(C) less than 7
(D) pH value has nothing to do with basic solution

Q7. Following elements have face-centred cubic structure
(A) gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt
(B) Mg, Zn, Ti, Zr, Br, Cd
(C) a iron (below 910°C and between 1400 to 1539°C), W
(D) all of the above

Q8. Recrystallisation temperature can belowered by
(A) purification of metal
(B) grain refinement
(C) working at lower temperature
(D) all of the above

Q9. Pearlite is a combination of
(A) ferrite and cementite
(B) cementite and gamma iron
(C) ferrite and austenite
(D) ferrite and iron graphite

Q10. Austenite rs a combination of
(A) ferrite and cementite
(B) cementite and gamma iron
(C) ferrite and iron graphite
(D) pearlite and ferrite

Q11. Tungsten in high speed steel provides
(A) hot hardness
(B) wear resistance
(C) sharp cutting edge
(D) cold hardness

Q12. Which of the following is not the correct method of increasing fatigue limit
(A) shot peening
(B) nitriding of surface
(C) cold working
(D) surface decarburisation

Q13. Connecting rod is usually made of
(A) low carbon steel
(B) medium carbon steel
(C) high carbon steel
(D) cast iron.

Q14. Which of the following pipes is least corrosion resistant
(A) brass
(B) mild steel
(C) cast iron
(D) wrought iron

Q15. 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 copper and carbon.

Q16. High carbon steel carries carbon %age c
(A) 0.1 to 0.35%
(B) 0.35 to 0.65%
(C) 0.65 to 0.8%
(D) 0.8 to 1.5%

Q17. Cobalt in steel
(A) improves wear resistance, cuttinability and toughness
(B) refines grain size and produces les tendency to carburisation, improve corrosion and heat resistant proper ties
(C) improves cutting ability and reduce hardenability
(D) gives ductility, toughness, tensile strength and anti corrosion property:

Q18. The percentage of carbon in low carbon steel is
(A) 0.0015
(B) 0.003
(C) 0.005
(D) 0.7%.

Q19. The hardness of steel increases if it contains
(A) austenite
(B) martensite
(C) cementite
(D) all of the above.

Q20. Nodular iron has
(A) low melting point
(B) high tensile strength
(C) good fluidity
(D) all of the above.