Mechanical Engineering MCQs

Page No. 33

Ductile 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 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 creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material



Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio_________________?


a50 : 50


b30 : 70


c70 : 30


d40 : 60


View Answer 30 : 70

Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio _____________________?


a50 : 20 : 20 : 10


b40 : 30 : 20 : 10


c50 : 20 : 10 : 20


d30 : 20 : 30 : 20


View Answer 50 : 20 : 20 : 10

Corrosion resistance of steel is increased by adding__________________?


achromium and nickel


bnickel and molybdenum


caluminium and zinc


dtungsten and sulfur


View Answer chromium and nickel

The usual composition of a soldering alloy is__________________?


atin, lead and small percentage of antimony


btin and lead


ctin, lead and silver


dtin and copper



The crystal structure of brass is_________________?


aF.C.C.


bB.C.C.


cH.C.P.


dOrthorhombic crystalline structure


View Answer F.C.C.

A specimen of aluminium metal when observed under microscope shows __________________?


aB.C.C. crystalline structure


bF.C.C. crystal structure


cH.C.P. structure


da complex cubic structure



Brass contains___________________?


a70% copper and 30% zinc


b90% copper and 10% tin


c85-92% copper and rest tin with little lead and nickel


d70-75% copper and rest tin



Steel made from phosphatic iron is_________________?


abrittle


bhard


cductile


dtough


View Answer brittle

Which one of the following metals would work-harden more quickly than the others__________________?


acopper


bbrass


clead


dsilver


View Answer brass

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