Engineering Materials objective questions with answers part1

Q1. For the allotropic forms of iron, the points of arrest are
(A) the points where no further change oc-curs
(B) constant for all metals
(C) the points where there is no further flow of metal
(D) the points of discontinuity

Q2. The percentage of carbon in pig iron varies from
(A) 0.3 to 1.2%
(B) 1.6 to 2.5%
(C) 2.5 to 4%
(D) 4 to 4.5%

Q3. The percentage of carbon in grey iron castings usually varies between
(A) 0.5 to 1.2%
(B) 1 – 2%
(C) 2.5 to 4.5%
(D) 5 – 7%

Q4. Pig iron is the name given to
(A) raw material for blast furnace
(B) product of blast furnace made by reduction of iron ore
(C) iron containing huge quantities of carbon
(D) iron in molten form in the ladles

Q5. The unique property of cast iron is its high
(A) malleability
(B) ductility
(C) damping characteristics
(D) hardness.

Q6. Cast iron is characterised by minimum of following percentage of carbon
(A) 2.00%
(B) 0.013
(C) 0.02
(D) 6.3%.

Q7. In grey cast iron, carbon is present in the form of
(A) cementite
(B) free carbon
(C) flakes
(D) spheroids

Q8. In nodular iron, graphite is in the form of
(A) cementite
(B) free carbon
(C) spheroids
(D) nodular aggregates of graphite.

Q9. In malleable iron, carbon is present in the form of
(A) cementite
(B) flakes
(C) spheroids
(D) nodular aggregates of graphite.

Q10. Wrought iron is
(A) hard
(B) high in strength
(C) highly resistant to corrosion
(D) least resistant to corrosion.

Q11. Sulphur in pig iron tends to make it
(A) hard
(B) soft
(C) ductile
(D) malleable.

Q12. Pick up wrong statement about wrought iron
(A) It contains carbon of the order of 0 to 0.25%
(B) It is very soft and ductile
(C) It can be easily forge welded
(D) It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling.

Q13. Iron is ----- type of material
(A) paramagnetic
(B) ferromagnetic
(C) ferroelectric
(D) dielectric

Q14. A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as
(A) allotropic change
(B) recrystallization
(C) heat treatment
(D) precipitation

Q15. Chilled cast iron has
(A) no graphite
(B) a very high percentage of graphite
(C) a low percentage of graphite
(D) graphite as its basic constituent of composition

Q16. Cast iron has
(A) high tensile strength
(B) its elastic limit close to the ultimate breaking strength
(C) high ductility
(D) all of the above

Q17. White cast iron contains carbon in the form of
(A) free carbon
(B) graphite
(C) cementite
(D) ferrite

Q18. In mottled cast iron, carbon is available in
(A) free form
(B) combined form
(C) nodular form
(D) partly in free and partly in combined state.

Q19. An important property of high silicon (12 – 18%) cast iron is the high
(A) brittleness
(B) plasticity
(C) corrosion resistance
(D) hardness.

Q20. An important property of malleable cast iron in comparison to grey cast iron is the high
(A) compressive strength
(B) ductility
(C) carbon content
(D) hardness