Which of the following has highest specific strength of all structural materials__________________? A. magnesium alloysB. titanium alloys C. chromium alloys D. magnetic steel alloys E. none of the above
White metal contains__________________? A. 63 to 67% nickel and 30% copper B. 88% copper and 10% tin and rest zincC. alloy of tin, lead and cadmium D. silver and chromium E. malleable cast iron and silver
Addition of silicon 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 E. none of the above
Which of the following alloys does not have copper as one of the constituents________________? A. delta metal B. monel metal C. constantanD. nichrome E. silicon bronze
Addition of manganese to aluminium results in__________________? A. improvement of casting characteristicsB. improvement of corrosion resistance C. one of the best known age and precipitation-hardening systems D. improving machinability E. none of the above
Which is false statement about properties of aluminium ___________________? A. modulus of elasticity is fairly lowB. wear resistance is very good C. fatigue strength is not high D. creep strength limits its use to fairly low temperatures E. corrosion resistance…
Admiralty gun metal contains__________________? A. 63 to 67% nickel and 30% copperB. 88% copper, 10% tin and rest zinc C. alloy of tin, lead and cadmium D. iron scrap and zinc E. none of the above
Free cutting steels_____________________? A. are used where ease in machining is the criterion B. contain carbon in free form C. require least cutting force D. do not exist E. can be cut freely even under adverse conditions
Permalloy is a___________________? A. kind of stainless steel B. none ferrous alloy C. polymer D. cutting tool materialE. nickel and iron alloy having high permeability
The alloy used for making electrical resistances and heating elements is____________________? A. nichrome B. invar C. magnin D. elinvar E. peiminvar