Hamad CHEMICAL ENGINEERING 14/02/2021 A. 0.7-1.0 B. 1.1-1.4 C. 1.5 – 1.8 D. 2.0 – 2.5 Related Mcqs: With increase in temperature, the electrical conductivity of semiconductors_____________________?A. Increases B. Decreases C. Remain constant D. Either A. or B. depends on the type of semi-conductor... Window panes of aeroplanes are normally made of_____________________?A. Perspex (PMMA) B. Teflon (PTFE) C. Bakelite (phenol formaldehyde) D. Polystyrene... Addition of silicon to cast iron ___________________?A. Promotes graphite module formation B. Improves its ductility C. Does not promote graphite flakes formation D. Increases the fluidity of molten metal... Factor of safety is the ratio of the ___________________ stress to the working stress?A. Tensile B. Compressive C. Yield D. Bearing... Principal alloying element in Elinvar (used for making hair springs for watches) is__________________?A. Copper B. Aluminium C. Nickel D. Zinc...
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