Engineering Materials Objective Questions with Answers - Set 03 - ObjectiveBooks
Engineering Materials Objective Questions with Answers - Set 03

Engineering Materials Objective Questions with Answers - Set 03

Practice Test: Question Set - 03

1. 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
2. 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
3. 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
4. In a hardening process, the hypo-eutectoid steel is
    (A) Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
    (B) Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
    (C) Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
    (D) Heated below or closes to the lower critical temperature and then cooled slowly
5. The correct composition of Babbitt metal is
    (A) 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi
    (B) 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg
    (C) 87% Sn, 4% Cu, 8% Sb, 1% Al
    (D) 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg
6. When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of
    (A) Mainly ferrite
    (B) Mainly pearlite
    (C) Ferrite and pearlite
    (D) Pearlite and cementite
7. Dow metal contains
    (A) 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
    (B) 92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg
    (C) 90% aluminium and 90% copper
    (D) 90% magnesium and 9% aluminium with some copper
8. Body centered cubic space lattice is found in
    (A) Zinc, magnesium, cobalt, cadmium, antimony and bismuth
    (B) Gamma iron, aluminium, copper, lead, silver and nickel
    (C) Alpha iron, tungsten, chromium and molybdenum
    (D) None of the above
9. Which of the following alloys does not have copper as one of the constituents?
    (A) Delta metal
    (B) Monel metal
    (C) Constantan
    (D) Nichrome
10. In spheroidising process, the steel is
    (A) Heated below the lower critical temperature and then cooled slowly
    (B) Heated up to the lower critical temperature and then cooled in still air
    (C) Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
    (D) None of the above
11. Which of the following alloys does not contain tin?
    (A) White metal
    (B) Solder admiralty
    (C) Fusible metal
    (D) Phosphor bronze
12. The bond formed by transferring electrons from one atom to another is called
    (A) Ionic bond
    (B) Covalent bond
    (C) Metallic bond
    (D) None of these
13. Addition of manganese to aluminium results in
    (A) Improvement of casting characteristics
    (B) Improvement of corrosion resistance
    (C) One of the best known age and precipitation hardening systems
    (D) Improving machinability
14. When medium carbon steel is heated to coarsening temperature
    (A) There is no change in grain size
    (B) The average grain size is a minimum
    (C) The grain size increases very rapidly
    (D) The grain size first increases and then decreases very rapidly
15. Admiralty gun metal contains
    (A) 63 to 67% nickel and 30% copper
    (B) 88% copper, 10% tin and rest zinc
    (C) Alloy of tin, lead and cadmium
    (D) Iron scrap and zinc
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