Engineering Materials

111. Phosphor bronze contains

1. 0.5% of phosphorous
2. 1% phosphorous
3. 2.5% phosphorous
4. 5% phosphorous
5. none of the above.

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112. Pick up the wrong statement

1. aluminium in steel results in excessive grain growth
2. manganese in steel induces hardness
3. nickel and chromium in steel help in raising the elastic limit and improve the resilience and ductility
4. tungsten in steels improves magnetic properties and hardenability
5. sulphur, phosphorous and lead im¬prove machining properties of steel.

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113. Pick up the wrong statement Nickel and chromium in steel help in

1. providing corrosion resistance
2. improving machining properties
3. providing high strength at elevated temperatures
4. raising the elastic limit
5. improving the resilience and ductility.

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114. Pick up wrong statement about wrought iron

1. It contains carbon of the order of 0 to 0.25%
2. It melts at 1535°C
3. It is very soft and ductile
4. It can be easily forge welded
5. It is made by adding suitable percent¬age of carbon to molten iron and subjecting the product to repeated hammering and rolling.

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115. Pig iron is the name given to

1. raw material for blast furnace
2. product of blast furnace made by reduction of iron ore
3. iron containing huge quantities of carbon
4. iron in molten form in the ladles
5. iron scrap.

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116. Pipes for bicycle frames are made of

1. cold rolled steel
2. hot rolled steel
3. forged steel
4. cast steel
5. carbon-chrome steel.

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117. Points of arrest for iron correspond to

1. stages at which allotropic forms change
2. stages at which further heating does not increase temperature for some time
3. stages at which properties do not change with increase in temperature
4. there is nothing like points of arrest
5. none of the above.

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118. Preheating is essential in welding

1. cast iron
2. high speed steel
3. all non-ferrous materials
4. all of the above
5. none of the above.

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119. Process of austempering results in

1. formation of bainite structure
2. carburised structure
3. martenistic structure
4. lamellar layers of carbide distributed throughout the structure
5. relieving of stresses throughout a component.

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120. Pure iron is the structure of

1. ferrite
2. pearlite
3. anstenite
4. ferrite and cementite
5. ferrite and pearlite.

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