Practice Test: Question Set - 53
1. The atmospheric temperature during melting of ice/snow (in the atmosphere)
- (A) Decreases
- (B) Increases
- (C) Remain same
- (D) May increase or decrease; depends on the altitude where snow melts
2. Identify the correct statement with reference to the extractive metallurgy of aluminium.
- (A) The electrolyte consists of molten Na3AlF6 with
approximately 1 to 8% Al2O3
- (B) Approximately 80% of the aluminium deposited on the cathode comes
from cryolite
- (C) Sodium is deposited along with aluminium, but is immediately
vaporized
- (D) Anode effect sets in when the cryolite concentration goes below 40%
3. __________ is not a case hardening process.
- (A) Carburizing
- (B) Nitriding
- (C) Cyaniding
- (D) Annealing
4. The main charge in blast furnace is usually
- (A) Iron ore & coke
- (B) Iron ore, coke & air
- (C) Limestone, coke & iron ore
- (D) Limestone, sand & iron ore
5. Removal of non-condensable from steam or other vapor is termed as the __________ process.
- (A) Condensation
- (B) Deaeration
- (C) Scavenging
- (D) Exhaust
6. Maximum change in the hardness of martensite occurs in the carbon content range of __________ percent in steel.
- (A) 0.01 to 0.10
- (B) 0.2 to 0.4
- (C) 0.5 to 0.7
- (D) 0.8 to 1.0
7. __________ cannot increase the fatigue strength of a material.
- (A) Grain refining
- (B) Grain coarsening
- (C) Surface hardening
- (D) Shot peening
8. In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of
- (A) Stainless steel
- (B) Mild steel
- (C) High speed steel
- (D) High carbon steel
9. Speed of a submarine in deep sea & that of an aeroplane is measured by a/an
- (A) Pitot tube
- (B) Hot wire anemometer
- (C) Rotameter
- (D) Stroboscope
10. Production of a hollow product by inflation of a tube or parison is called the __________ process.
- (A) Blow moulding
- (B) Calendaring
- (C) Extrusion
- (D) Injection
11. Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ρ = specific weight of the gas)
- (A) √T
- (B) 1/√P
- (C) √y
- (D) 1/√ρ
12. Unbreakable crockeries are made from __________ polymers.
- (A) Polystyrene
- (B) Melamine
- (C) Polystyrene
- (D) Polyurethane
13. Coarse grained steels have
- (A) Low toughness
- (B) No tendency to distort
- (C) High density
- (D) Very high toughness
14. A form of stress corrosion failure termed as 'season cracking' is generally observed in
- (A) Thermosetting polymers
- (B) High carbon steels
- (C) Brasses
- (D) Borosilicate glasses
15. Hot & cold working of material causes its __________ deformation.
- (A) Visco-elastic
- (B) Isotropic
- (C) Elastic
- (D) Plastic
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