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Engineering :: Metallurgy

31.  Percentage of carbon is least in case of
A. Pig iron B. Cast iron
C. Malleable iron D. Wrought iron
E. Steel    
32.  The process used for making steel is
A. Bessemer converter B. Open hearth
C. Electric arc D. High frequency heating
E. Any of the above    
33.  In high frequency heating of steel, the heat is generated primarily due to
A. Eddy currents B. Stray magnetic fields
C. High voltage D. High power
E. High resistance of contact surface    
34.  Eddy currents
A. Increase with frequency B. Increase with square of frequency
C. Increase with cube of frequency D. Increase with fourth power of frequency
E. Increase as inverse of frequency    
35.  In eddy current heating of steel, if the depth of heating is to be increased
A. Frequency must be high B. Frequency must be low
C. Some resisting material must be applied on the surface of article to be heated D. Time of heating should be high
E. Voltage should be high    
36.  Brinell hardness of nitrided surface may be of the order of
A. 100 B. 150 to 200
C. 200 to 250 D. 300 to 450
E. More than 600    
37.  The chemical formula of cementite is
A. FeC B. Fe3C
C. FeC3 D. Fe2C3
E. Fe3C2    
38.  Which of the following is not true for cementite?
A. It is hard B. It is brittle
C. It is brilliantly white D. It is found is steels
E. It has low melting point    
39.  A fine grained steel will have the number of grains per square centimeter as
A. 3 to 16 B. 16 to 56
C. 56 to 100 D. 100 to 150
E. 150 to 1000    
40.  High carbon steels intended to be quenched in water should have manganese percentage less than
A. 2 percent B. 1.5 percent
C. 1 percent D. 0.5 percent
E. No manganese percent    

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