Engineering Materials Objective Questions with Answers – Set 09

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All questions answers in the last paragraph

Q1. Ductility of a material can be defined as

(A) Ability to undergo large permanent deformations in compression
(B) Ability to recover its original form
(C) Ability to undergo large permanent deformations in tension
(D) All of the above

Q2. The property of a material which enables it to retain the deformation permanently, is called

(A) Brittleness
(B) Ductility
(C) Malleability
(D) Plasticity

Q3. Points of arrest for iron correspond to

(A) Stages at which allotropic forms change
(B) Stages at which further heating does not increase temperature for some time
(C) Stages at which properties do not change with increase in temperature
(D) There is nothing like points of arrest

Q4. The addition of which of the following improves machining of copper?

(A) Sulphur
(B) Vanadium
(C) Tin
(D) Zinc

Q5. Maximum percentage of carbon in austenite is

(A) 0.025%
(B) 0.26%
(C) 0.8%
(D) 1.7%

Q6. An eutectoid steel consists of

(A) Wholly pearlite
(B) Wholly austenite
(C) Pearlite and ferrite
(D) Pearlite and cementite

Q7. 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) None of the above

Q8. The portion of the blast furnace below its widest cross-section is called

(A) Hearth
(B) Stack
(C) Bosh
(D) Throat

Q9. 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

Q10. The ability of a material to absorb energy in the plastic range is called

(A) Resilience
(B) Creep
(C) Fatigue strength
(D) Toughness

Q11. A reversible change in the atomic structure of steel with corresponding change in the properties is known as

(A) Molecular change
(B) Physical change
(C) Allotropic change
(D) Solidus change

Q12. The metal suitable for bearings subjected to heavy loads, is

(A) Silicon bronze
(B) White metal
(C) Monel metal
(D) Phosphor bronze

Q13. Taps dies and drills contain carbon

(A) Below 0.5%
(B) Below 1%
(C) Above 1%
(D) Above 2.2%

Q14. Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?

(A) Sulphur
(B) Phosphorus
(C) Manganese
(D) Silicon

Q15. Recrystallization temperature can be lowered by

(A) Purification of metal
(B) Grain refinement
(C) Working at lower temperature
(D) All of the above

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All questions answers


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