Mechanical Engineering MCQs

Page No. 34

The composition of silver solder is ___________________?


asilver, copper, zinc


bsilver, tin, nickel


csilver, lead, zinc


dsilver, copper, aluminium


View Answer silver, copper, zinc

The hardness of steel primarily depends on _____________________?


a%age of carbon


b%age of alloying elements


cheat treatment employed


dshape of carbides and their distribution in iron



Malleable cast iron _________________?


acontains l.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron


bis also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable


cis produced by annealing process. It is soft, tough, and easily machined metal


dis produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material



Tungsten in steel________________?


aimproves wear resistance, cutting ability and toughness


brefines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties


cimproves cutting ability and reduces hardenability


dgives ductility, toughness, tensile strength and anticorrosion properties



Which of the following is not the correct method of increasing fatigue limit __________________?


ashot peening


bnitriding of surface


ccold working


dsurface decarburisation



Which of the following pipes is least corrosion resistant__________________?


abrass


bmild steel


ccast iron


dwrought iron


View Answer wrought iron

High carbon steel carries carbon %age c_________________?


a0.1 to 0.3%


b0.3 to 0.6%


c0.6 to 0.8%


d0.8 to 1.5%


View Answer 0.8 to 1.5%

The percentage of carbon in low carbon steel is__________________?


a0.05%


b0.15%


c0.3%


d0.5%


View Answer 0.15%

Grey cast iron_____________________?


acontains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron


bis also known as chilled cast iron am is obtained by cooling rapidly. It i: almost unmachinable


cis produced by annealing process. I is soft, tough and easily machinec metal


dis produced by small additions o magnesium (or cerium) in the ladle



Nickel in steel___________________?


aimproves wear resistance, cutting ability and toughness


brefines grain size and produces less tendency to carburisation, improves corrosion and heat resistant proper¬ties


cimproves cutting ability and reduces hardenability


dgives ductility, toughness, tensile strength and anticorrosion properties



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