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 vaporised
(D) Anode effect sets in when the cryolite concentration goes below 40%.
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
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
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
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
Removal of non-condensable from steam or other vapour is termed as the ________________ process?
(A) Condensation
(B) Deaeration
(C) Scavenging
(D) Exhaust
______________ cannot increase the fatigue strength of a material?
(A) Grain refining
(B) Grain coarsening
(C) Surface hardening
(D) Shot peening
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
Cold heading or upsetting is categorised as the ________________ process ?
(A) Extrusion
(B) Bending
(C) Rolling
(D) Forging
The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm.mole, its fugacity at 300 K would be________________?
(A) 3171Pa
(B) 3567Pa
(C) 1.01 × 105Pa
(D) 5000Pa