Engineering Materials Objective Questions with Answers - Set 20 - ObjectiveBooks

Engineering Materials Objective Questions with Answers - Set 20

Practice Test: Question Set - 20

1. An example of amorphous material is
    (A) Zinc
    (B) Lead
    (C) Silver
    (D) Glass

2. Which is false statement about tempering? Tempering is done to
    (A) Improve machinability
    (B) Improve ductility
    (C) Improve toughness
    (D) Release stresses

3. Which of the following is the binding material in cemented carbides?
    (A) Cobalt
    (B) Nickel
    (C) Vanadium
    (D) Iron

4. Shock resisting steels should have
    (A) Low wear resistance
    (B) Low hardness
    (C) Low tensile strength
    (D) Toughness

5. Chromium 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

6. Manganese in steel increases its
    (A) Tensile strength
    (B) Hardness
    (C) Ductility
    (D) Fluidity

7. Tungsten in high speed steel provides
    (A) Hot hardness
    (B) Toughness
    (C) Wear resistance
    (D) Sharp cutting edge

8. 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

9. Connecting rod is usually made of
    (A) Aluminium
    (B) Low carbon steel
    (C) Medium carbon steel
    (D) High carbon steel

10. The hardness is the property of a material due to which it
    (A) Can be drawn into wires
    (B) Breaks with little permanent distortion
    (C) Can cut another metal
    (D) Can be rolled or hammered into thin sheets

11. High carbon steel carries carbon percentage
    (A) 0.1 to 0.3%
    (B) 0.3 to 0.6%
    (C) 0.6 to 0.8%
    (D) 0.8 to 1.5%

12. The hardness of steel increases if it contains
    (A) Austenite
    (B) Martensite
    (C) Pearlite
    (D) Cementite

13. The presence of sulphur in pig iron makes
    (A) It easily machinable
    (B) It brittle
    (C) It hard
    (D) The casting unsound

14. Melting point of iron is
    (A) 1539°C
    (B) 1601°C
    (C) 1489°C
    (D) 1712°C

15. Compressive strength of grey cast iron in tonnes/cm is of the order of
    (A) 35
    (B) 57
    (C) 710
    (D) 1015

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