Engineering Materials objective questions with answers part7

Q1. Nickel in steel
(A) improves wear resistance, cutting ability and toughness
(B) refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
(C) improves cutting ability and reduces hardenability
(D) gives ductility, toughness, tensile strength and anticorrosion properties

Q2. Which of the following elements does not impart hardness to steel
(A) copper
(B) chromium
(C) nickel
(D) silicon

Q3. The presence of sulphur in pig iron makes
(A) it easily machinable
(B) it brittle
(C) it hard
(D) the casting unsound

Q4. Melting point of iron is
(A) 1539°C
(B) 1621°C
(C) 1589°C
(D) 1712°C

Q5. Compressive strength of grey cast iron in tonnes/cm is of the order of
(A) 4- 5
(B) 05/07/20
(C) 12-15
(D) 15-22.

Q6. Blast furnace produces following by reduction of iron ore
(A) cast iron
(B) pig iron
(C) wrought iron
(D) malleable iron

Q7. Cupola produces following material
(A) cast iron
(B) pig iron
(C) wrought iron
(D) malleable iron

Q8. The machinability of steel is increased by
(A) silicon and sulphur
(B) phosphorous, lead and sulphur
(C) sulphur, graphite and aluminium
(D) phosphorous and aluminium

Q9. The following element can’t impart high strength at elevated temperature
(A) manganese
(B) magnesium
(C) nickel
(D) silicon

Q10. Which of the following element results in presence of free graphite in C.I.
(A) carbon
(B) sulphur
(C) silicon
(D) manganese

Q11. White cast iron
(A) contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
(B) is also known as chilled cast iron and is obtained by cooling rapidly. It is almost un-machinable
(C) is produced by annealing process. It is soft, tough and easily machined metal
(D) is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Q12. Cold rolled steel sheets contain carbon of the following order
(A) 0.10%
(B) 0.004
(C) 0.006
(D) 0.8%.

Q13. Pipes for bicycle frames are made of
(A) cold rolled steel
(B) hot rolled steel
(C) forged steel
(D) cast steel

Q14. Large forgings, crank shafts, axles normally contain carbon up to
(A) 0.05 to 0.20%
(B) 0.20 to 0.45%
(C) 0.45 to 0.55%
(D) 1.0 to 1.2%.

Q15. Heavy duty leaf and coil spring* contain carbon of the following order
(A) 0.002
(B) 0.005
(C) 0.008
(D) 0.01

Q16. Taps, dies and drills contain carbon
(A) below 0.5%
(B) below 1%
(C) above 1%
(D) above 2.2%

Q17. Drop forging dies contain carbon of the order of
(A) 0.12 to 0.25%
(B) 0.25 to 0.5%
(C) 0.6 to 0.7%
(D) 0.7 to 0.9%

Q18. Which is the false statement about wrought iron. It has
(A) high resistance to rusting and corrosion
(B) high ductility
(C) ability of hold protective coating
(D) uniform strength in all directions.

Q19. The tensile strength of wrought iron is maximum
(A) along the lines of slag distribution
(B) perpendicular to lines of slag distribution
(C) uniform in all directions
(D) unpredictable

Q20. Balls for ball bearings are made of
(A) mild steel
(B) stainless steel
(C) carbon-chrome steel
(D) high carbon steel.