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Engineering :: Metallurgy

111.  Crucible for melting of metals are made of
A. Cast iron B. Chromium
C. Hard metal D. Graphite
E. Tungsten    
112.  Cast iron pipes are manufactured by
A. Sand acting method B. Lost wax method
C. Shell moulding method D. Die casting method
E. Centrifugal casting method    
113.  For producing cast iron pipes by centrifugal casting method the core used is
A. Sand core B. Wax core
C. Metallic core D. Clay core
E. No core is used    
114.  Petrol engine carburetors are manufactured by
A. Sand casting B. Centrifugal casting
C. Shell casting D. Die casting
E. Lost wax casting    
115.  Coarse grained steels
A. Are less tough B. Are less liable to distortion
C. Have poor machinability D. Have leser depth hardening power
E. None of the above    
116.  Maximum hardness that can be achieved in plain carbon steel is of the order of
A. 50 Rockwell 'C' B. 66 - 67 Rockwell 'C'
C. 100 - 150 Rockwell 'C' D. 80-85 Rockwell 'C'
E. There is no such limit for hardness    
117.  For normalizing, steel is heated to
A. 700?C B. 900?C
C. 100?C below critical temperature D. Critical temperature
E. 30?C to 60?C above critical temperature    
118.  In which process steel is heated below the critical temperature
A. Annealing B. Normalizing
C. Hardening D. Temperting
E. Carburizing    
119.  Carbon percentage in steel for carburizing is usually
A. 1.5 percent B. 1 percent
C. 0.8 percent D. 0.6 percent
E. 0.15 percent    
120.  Which of the following is not a hardening process?
A. Cyaniding B. Nitriding
C. Sphcroidizing D. Carburising
E. Induction hardening    

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