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

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

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

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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

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b30 : 70

✓


c70 : 30

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d40 : 60

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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

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c50 : 20 : 10 : 20

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d30 : 20 : 30 : 20

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View Answer 50 : 20 : 20 : 10

Corrosion resistance of steel is increased by adding__________________?


achromium and nickel

✓


bnickel and molybdenum

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caluminium and zinc

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dtungsten and sulfur

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View Answer chromium and nickel

The usual composition of a soldering alloy is__________________?


atin, lead and small percentage of antimony

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btin and lead

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ctin, lead and silver

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dtin and copper

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The crystal structure of brass is_________________?


aF.C.C.

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bB.C.C.

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cH.C.P.

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dOrthorhombic crystalline structure

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View Answer F.C.C.

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


aB.C.C. crystalline structure

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bF.C.C. crystal structure

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cH.C.P. structure

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da complex cubic structure

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Brass contains___________________?


a70% copper and 30% zinc

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b90% copper and 10% tin

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

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d70-75% copper and rest tin

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Steel made from phosphatic iron is_________________?


abrittle

✓


bhard

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cductile

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dtough

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View Answer brittle

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


acopper

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bbrass

✓


clead

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dsilver

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View Answer brass

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