Engineering Materials Objective Questions with Answers - Set 10 - ObjectiveBooks

Engineering Materials Objective Questions with Answers - Set 10

Practice Test: Question Set - 10

1. 1841 high speed steel contains
    (A) Vanadium 4%, chromium 18% and tungsten 1%
    (B) Vanadium 1%, chromium 4% and tungsten 18%
    (C) Vanadium 18%, chromium 1% and tungsten 4%
    (D) None of the above

2. Age-hardening is related with
    (A) Stainless steel
    (B) Gun metal
    (C) German silver
    (D) Duralumin

3. Which of the following statement is true about brittle fracture?
    (A) High temperature and low strain rates favour brittle fracture
    (B) Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
    (C) Brittle fracture is always preceded by noise
    (D) Cup and cone formation is characteristic for brittle materials

4. Recrystallization temperature can be lowered by
    (A) Purification of metal
    (B) Grain refinement
    (C) Working at lower temperature
    (D) All of the above

5. The ability of a material to absorb energy in the plastic range is called
    (A) Resilience
    (B) Creep
    (C) Fatigue strength
    (D) Toughness

6. Maximum percentage of carbon in austenite is
    (A) 0.025%
    (B) 0.26%
    (C) 0.8%
    (D) 1.7%

7. In low carbon steels, ________ raises the yield point and improves the resistance to atmospheric corrosion.
    (A) Sulphur
    (B) Phosphorus
    (C) Manganese
    (D) Silicon

8. Super conduction by metals is observed in the temperature range of
    (A) Below 10°K
    (B) Above 100°K
    (C) Around 0°C
    (D) Around 100°C

9. Connecting rod is, usually, made from
    (A) Low carbon steel
    (B) High carbon steel
    (C) Medium carbon steel
    (D) High speed steel

10. Ferromagnetic alpha iron exists in temperature range of
    (A) Below 723°C
    (B) 770 to 910°C
    (C) 910 to 1440°C
    (D) 1400 to 1539°C

11. Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?
    (A) Silicon
    (B) Sulphur
    (C) Manganese
    (D) Phosphorus

12. For the allotropic forms of iron, the points of arrest are
    (A) The points where no further change occurs
    (B) Constant for all metals
    (C) The points where there is no further flow of metal
    (D) The points of discontinuity

13. 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

14. 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

15. 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

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