Engineering Materials Objective Questions with Answers – Set 06

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All questions answers in the last paragraph

Q1. The defect which takes place due to imperfect packing of atoms during crystallization is known as

(A) Line defect
(B) Surface defect
(C) Point defect
(D) None of these

Q2. 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) 0.55 to 1.0%

Q3. Which of the following metal shrinks most from molten state to solid state?

(A) Cast iron
(B) Cast steel
(C) Brass
(D) Admiralty metal

Q4. The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to 100°C will

(A) Increase
(B) Decrease
(C) Remain same
(D) First increase and then decrease

Q5. A material is said to be allotropic, if it has

(A) Fixed structure at all temperatures
(B) Atoms distributed in random pattern
(C) Different crystal structures at different temperatures
(D) Any one of the above

Q6. A specimen of aluminium metal when observed under microscope shows

(A) B.C.C. crystalline structure
(B) F.C.C. crystal structure
(C) H.C.P. structure
(D) A complex cubic structure

Q7. Which of the following statement is incorrect about duralumin?

(A) It is prone to age hardening
(B) It can be forged
(C) It has good machining properties
(D) It is lighter than pure aluminium

Q8. Tungsten 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 anti-corrosion properties

Q9. Macrostructure of a material is, generally, examined by

(A) Naked eye
(B) Optical microscope
(C) Metallurgical microscope
(D) X-ray techniques

Q10. 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

Q11. There are fourteen atoms in a unit cell of

(A) Body centered cubic space lattice
(B) Face centered cubic space lattice
(C) Close packed hexagonal space lattice
(D) None of these

Q12. The hardness of steel primarily depends on

(A) Percentage of carbon
(B) Percentage of alloying elements
(C) Heat treatment employed
(D) Shape of carbides and their distribution in iron

Q13. The ability of a material to resist fracture due to high impact loads, is called

(A) Strength
(B) Stiffness
(C) Toughness
(D) Brittleness

Q14. Which of the following pipes is least corrosion resistant?

(A) Brass
(B) Mild steel
(C) Cast iron
(D) Wrought iron

Q15. Inconel contains

(A) 65% nickel, 15% chromium and 20% iron
(B) 68% nickel, 29% copper and 3% other constituents
(C) 80% nickel and 20% chromium
(D) 80% nickel, 14% chromium and 6% iron

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