Engineering Materials Objective Questions with Answers – Set 01

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All questions answers in the last paragraph

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 anti-corrosion properties

Q2. Which of the following impurity in cast iron makes it hard and brittle?

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

Q3. Elinvar, an alloy used in precision instruments, hair springs for watches, etc. contains the following element as principal alloying element

(A) Iron
(B) Copper
(C) Aluminium
(D) Nickel

Q4. The alloy, mainly used for corrosion resistance in stainless steels is

(A) Silicon
(B) Manganese
(C) Carbon
(D) Chromium

Q5. Aluminium bronze contains

(A) 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
(B) 92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
(C) 10% aluminium and 90% copper
(D) 90% magnesium and 9% aluminium with some copper

Q6. For a steel containing 0.8% carbon

(A) There is no critical point
(B) There is only one critical point
(C) There are two critical points
(D) There can be any number of critical points

Q7. Tensile strength of steel can be safely increased by

(A) Adding carbon up to 2.8%
(B) Adding carbon up to 6.3%
(C) Adding carbon up to 0.83%
(D) Adding small quantities of copper

Q8. Which of the following statement is wrong?

(A) Steel with 0.8% carbon is wholly pearlite
(B) The amount of cementite increases with the increase in percentage of carbon in iron
(C) A mechanical mixture of 87% cementite and 13% ferrite is called pearlite
(D) The cementite is identified as round particles in the structure

Q9. The correct sequence for descending order of machinability is

(A) Grey cast iron, low carbon steel, wrought iron
(B) Low carbon steel, grey cast iron, wrought iron
(C) Wrought iron, low carbon steel, grey cast iron
(D) Wrought iron, grey cast iron, low carbon steel

Q10. In basic Bessemer process, the furnace is lined with

(A) Silica bricks
(B) A mixture of tar and burnt dolomite bricks
(C) Both (A) and (B)
(D) None of these

Q11. Blast furnace produces following by reduction of iron ore

(A) Cast iron
(B) Pig iron
(C) Wrought iron
(D) Malleable iron

Q12. Which of the following metal is used for nuclear energy?

(A) Uranium
(B) Thorium
(C) Niobium
(D) All of these

Q13. Which of the following has highest specific strength of all structural materials?

(A) Magnesium alloys
(B) Titanium alloys
(C) Chromium alloys
(D) Magnetic steel alloys

Q14. Duralumin contains

(A) 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
(B) 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
(C) 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
(D) 5 to 6% tin, 2 to 3% copper and rest aluminium

Q15. Structural steel contains following principal alloying elements

(A) Nickel, chromium and manganese
(B) Tungsten, molybdenum and phosphorous
(C) Lead, tin, aluminium
(D) Zinc, sulphur, and chromium

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