Materials and Construction __________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working. Strain ageing Screw dislocation Solid solution hardening Twinning Strain ageing Screw dislocation Solid solution hardening Twinning ANSWER DOWNLOAD EXAMIANS APP
Materials and Construction Vycor, a widely used material for making 'thermal wells' in temperature measurement, is a Metallic alloy Thermosetting plastic Glass Cermet Metallic alloy Thermosetting plastic Glass Cermet ANSWER DOWNLOAD EXAMIANS APP
Materials and Construction Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysterisis loss and high magnetic permeability are used for electrical appliances. Which of the following electrical appliances made of silicon steel contains maximum percentage of silicon (about 4%)? Generators and small motors Armature of small motors/generators Induction motors High frequency transformers Generators and small motors Armature of small motors/generators Induction motors High frequency transformers ANSWER DOWNLOAD EXAMIANS APP
Materials and Construction A measure of toughness of a material is its Yield strength Ultimate strength Area under stress-strain diagram Percentage elongation Yield strength Ultimate strength Area under stress-strain diagram Percentage elongation ANSWER DOWNLOAD EXAMIANS APP
Materials and Construction In cold working of metal as compared to its hot working Cracks and blow holes are eliminated Ductility and impact strength improves Yield stress, hardness and fatigue strength is not at all affected Appreciable strain hardening is produced Cracks and blow holes are eliminated Ductility and impact strength improves Yield stress, hardness and fatigue strength is not at all affected Appreciable strain hardening is produced ANSWER DOWNLOAD EXAMIANS APP
Materials and Construction Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (l/20th of ordinary metals)? Constantan Alumel Chromel Invar Constantan Alumel Chromel Invar ANSWER DOWNLOAD EXAMIANS APP
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