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Engineering :: Metallurgy

71.  Dilute nitric acid applied to a clean fracture of white cast iron will produce
A. White stain B. Grey stain
C. Black stain D. Brown stain
E. Pink stain    
72.  Which of the following is not true in case of white cast iron
A. It is whitish in colour B. It is strong
C. It is hard D. It is brittle
E. It is malleable    
73.  For acid resistance cast iron should have silicon percentage of
A. 1 percent B. 2 percent
C. 10 percent D. 15 percent
E. 25 percent    
74.  Highest melting point is for
A. Cast iron B. Wrought iron
C. Mild steel D. High carbon steel
E. Low carbon steel    
75.  Compressive strength is highest in case of
A. Cast iron B. Wrought iron
C. Mild steel D. Low carbon steel
E. High carbon steel    
76.  Ultimate tensile strength is least in case of
A. Cast iron B. Wrought iron
C. Mild steel D. Low carbon steel
E. High carbon steel    
77.  Ultimate tensile strength is least in case of mild steel and is of the order of
A. 35 - 45 kg/mm2 B. 50 - 60 kg/mm2
C. 60 - 75 kg/mm2 D. 75 - 90 kg/mm2
E. 90 - 100 kg/mm2    
78.  Welding process used in fabrication of car bodies is
A. Arc welding B. Resistance welding
C. Thermit welding D. Brazing
E. Soldering    
79.  The fastest cooling rate is achieved when steel is quenched in
A. Brine B. Air
C. Oil D. Water
80.  Brass in an alloy of
A. Copper and tin B. Copper and zinc
C. Copper and lead D. Copper and nickel
E. Copper and aluminium    

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