The usual composition of a soldering alloy is__________________? A. tin, lead and small percentage of antimony B. tin and lead C. tin, lead and silver D. tin and copper E. tin, copper and lead
The crystal structure of brass is_________________? A. F.C.C. B. B.C.C. C. H.C.P. D. Orthorhombic crystalline structure E. none of the above
A specimen of aluminium metal when observed under microscope shows __________________? A. B.C.C. crystalline structureB. F.C.C. crystal structure C. H.C.P. structure D. a complex cubic structure E. orthorhombic crystalline structure
Brass contains___________________? A. 70% copper and 30% zinc B. 90% copper and 10% tin C. 85-92% copper and rest tin with little lead and nickel D. 70-75% copper and rest tin E. 70% copper and 30% tin
Steel made from phosphatic iron is_________________? A. brittle B. hard C. ductile D. tough E. malleable
Which one of the following metals would work-harden more quickly than the others__________________? A. copperB. brass C. lead D. silver E. aluminium
The composition of silver solder is ___________________? A. silver, copper, zinc B. silver, tin, nickel C. silver, lead, zinc D. silver, copper, aluminium E. silver, lead, tin
The hardness of steel primarily depends on _____________________? A. %age of carbon B. %age of alloying elements C. heat treatment employed D. method of manufactureE. shape of carbides and their distribution in iron
Malleable cast iron _________________? A. contains l.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron B. is also known as chilled cast iron and is obtained by cooling rapidly. It is…
Tungsten in steel________________? A. improves wear resistance, cutting ability and toughnessB. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties C. improves cutting ability and reduces hardenability D. gives ductility, toughness, tensile strength and…