Engineering Materials Objective Questions with Answers – Set 18

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All questions answers in the last paragraph

Q1. 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

Q2. The most effective inhibitor of grain growth, when added in small quantities is

(A) Carbon
(B) Vanadium
(C) Manganese
(D) Cobalt

Q3. Quenching is not necessary when hardening is done by

(A) Case hardening
(B) Flame hardening
(C) Nitriding
(D) Any one of these

Q4. The loss of strength in compression with simultaneous gain in strength in tension due to overloading is known as

(A) Hysteresis
(B) Creep
(C) Visco elasticity
(D) Boeschinger effect

Q5. Connecting rod is usually made of

(A) Aluminium
(B) Low carbon steel
(C) Medium carbon steel
(D) High carbon steel

Q6. Nodular cast iron is produced by adding __ to the molten cast iron.

(A) Nickel
(B) Chromium
(C) Copper
(D) Magnesium

Q7. The property of a material due to which it breaks with little permanent distortion, is called

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

Q8. Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is

(A) Silver metal
(B) Duralumin
(C) Hastelloy
(D) Invar

Q9. Process of Austempering results in

(A) Formation of bainite structure
(B) Carburised structure
(C) Martenistic structure
(D) Lamellar layers of carbide distributed throughout the structure

Q10. Sulphur in cast iron

(A) Makes the iron soft and easily machinable
(B) Increases hardness and brittleness
(C) Make the iron white and hard
(D) Aids fusibility and fluidity

Q11. 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

Q12. Depth of hardness of steel is increased by addition of

(A) Nickel
(B) Chromium
(C) Tungsten
(D) Vanadium

Q13. The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is

(A) Chromium
(B) Nickel
(C) Vanadium
(D) Cobalt

Q14. Hardness of martensite is about

(A) RC 65
(B) RC 48
(C) RC 57
(D) RC 80

Q15. Tungsten in high speed steel provides

(A) Hot hardness
(B) Toughness
(C) Wear resistance
(D) Sharp cutting edge

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