Mechanical Engineering MCQs

Page No. 34

The composition of silver solder is ___________________?


asilver, copper, zinc

✓


bsilver, tin, nickel

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csilver, lead, zinc

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dsilver, copper, aluminium

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View Answer silver, copper, zinc

The hardness of steel primarily depends on _____________________?


a%age of carbon

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b%age of alloying elements

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cheat treatment employed

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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

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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

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Tungsten in steel________________?


aimproves wear resistance, cutting ability and toughness

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

✓


cimproves cutting ability and reduces hardenability

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dgives ductility, toughness, tensile strength and anticorrosion properties

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


ashot peening

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bnitriding of surface

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ccold working

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dsurface decarburisation

✓



Which of the following pipes is least corrosion resistant__________________?


abrass

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bmild steel

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ccast iron

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dwrought iron

✓


View Answer wrought iron

High carbon steel carries carbon %age c_________________?


a0.1 to 0.3%

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b0.3 to 0.6%

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c0.6 to 0.8%

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d0.8 to 1.5%

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View Answer 0.8 to 1.5%

The percentage of carbon in low carbon steel is__________________?


a0.05%

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b0.15%

✓


c0.3%

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d0.5%

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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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