Engineering Materials Objective Questions with Answers - Set 07

Practice Test: Question Set - 07

1. 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%

2. 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

3. 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

4. Gamma-iron occurs between the temperature ranges of
    (A) 400°C to 600°C
    (B) 600°C to 900°C
    (C) 900°C to 1400°C
    (D) 1400°C to 1530°C

5. Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio
    (A) 50 : 20 : 20 : 10
    (B) 40 : 30 : 20 : 10
    (C) 50 : 20 : 10 : 20
    (D) 30 : 20 : 30 : 20

6. According to Indian standard specifications, plain carbon steel designated by 40 C8 means that the carbon content is
    (A) 0.04%
    (B) 0.35 to 0.45%
    (C) 0.4 to 0.6%
    (D) 0.6 to 0.8%

7. If a refractory contains high content of silicon, it means refractory is
    (A) Acidic
    (B) Basic
    (C) Neutral
    (D) Brittle

8. Cementite consist of
    (A) 13% carbon and 87% ferrite
    (B) 13% cementite and 87% ferrite
    (C) 13% ferrite and 87% cementite
    (D) 6.67% carbon and 93.33% iron

9. The usual composition of a soldering alloy is
    (A) Tin, lead and small percentage of antimony
    (B) Tin and lead
    (C) Tin, lead and silver
    (D) Tin and copper

10. The property of a material which enables it to retain the deformation permanently, is called
    (A) Brittleness
    (B) Ductility
    (C) Malleability
    (D) Plasticity

11. 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

12. The metal suitable for bearings subjected to heavy loads, is
    (A) Silicon bronze
    (B) White metal
    (C) Monel metal
    (D) Phosphor bronze

13. Which of the following elements does not impart hardness to steel?
    (A) Copper
    (B) Chromium
    (C) Nickel
    (D) Silicon

14. In low carbon steels, presence of small quantities of sulphur improves
    (A) Weldability
    (B) Formability
    (C) Machinability
    (D) Hardenability

15. Cobalt in steel
    (A) Improves wear resistance, cutting ability and toughness
    (B) Refines grain size and produces less tendency to carburisation, improve corrosion and heat resistant proper ties
    (C) Improves cutting ability and reduce hardenability
    (D) Gives ductility, toughness, tensile strength and anti corrosion property

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