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Mechanical Engineering Objective Questions { Material science }

134. Corrosion resistance of steel is increased by adding
A.Chromium and nickel
B.Nickel and molybdenum
C.Aluminium and zinc
D.Tungsten and sulphur
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135. Corrundum contains more than 95%
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136. Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio
A.50 : 20 : 20 : 10
B.40 : 30 : 20 : 10
C.50 : 20 : 10 : 20
D.30 : 20 : 30 : 20
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137. If a refractory contains high content of silicon, it means refractory is
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138. Bell metal contains
A.70% copper and 30% zinc
B.90% copper and 10% tin
C.85-92% copper and rest tin with little lead and nickel
D.70-75% copper and rest tin
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139. Which of the following is used for bearing liner
A.Gun metal
C.Bell metal
D.Babbit metal
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140. The correct sequence for descending order of machinability is
A.Grey cast iron, low carbon steel, wrought iron
B.Low carbon steel, grey cast iron, wrought iron
C.Wrought iron, low carbon steel, grey cast iron
D.Wrought iron, grey cast iron, low carbon steel
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