Engineering Materials

101. Mild steel belongs to the following category

1. low carbon steel
2. medium carbon steel
3. high carbon steel
4. alloy steel
5. special steel.

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102. Monel metal contains

1. 63 to 67% nickel and 30% copper
2. 88% copper and 10% tin and rest zinc
3. alloy of tin, lead and cadmium
4. malleable iron and zinc
5. none of the above.

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103. Muntz metal contains copper and zinc in the ratio of

1. 50 : 50
2. 40 : 60
3. 60 : 40
4. 20 : 80
5. 80 : 20.

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104. Neutral solution is one which has pH value

1. greater than 7
2. less than 7
3. equal to 7
4. pH value has nothing to do with neutral solution
5. none of the above.

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105. Nickel in steel

1. improves wear resistance, cutting ability and toughness
2. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant proper¬ties
3. improves cutting ability and reduces hardenability
4. gives ductility, toughness, tensile strength and anticorrosion properties
5. none of the above.

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106. Nodular iron has

1. high maehinability
2. low melting point
3. high tensile strength
4. good fluidity
5. all of the above.

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107. Paramagnetic alpha iron changes to gamma iron at

1. 770°C
2. 910°C
3. 1440°C
4. 1539°C
5. none of the above.

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108. Pearlite is a combination of

1. ferrite and cementite
2. cementite and gamma iron
3. ferrite and austenite
4. ferrite and iron graphite
5. pearlite and ferrite.

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109. Permalloy is a

1. kind of stainless steel
2. none ferrous alloy
3. polymer
4. cutting tool material
5. nickel and iron alloy having high permeability.

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110. Perminvar alloy having constant permeability is an alloy of

1. nickel, copper and iron
2. nickel, copper and zinc
3. copper, nickel and antimony
4. iron, zinc and bismuth
5. antimony, copper and zinc.

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