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Engineering :: Metallurgy

131.  The property of a metal when the recovery after unloading is complete but not instantaneous is
A. creep B. Inelasticity
C. Anelasticity D. Viscoelasticity
132.  Which hardening process is generally not used for steels?
A. Induction hardening B. Age hardening
C. Nitriding D. Pack carburising
E. Cyanidin    
133.  For nitriding, the nitrogen is provided by
A. Heated air B. Ionised air
C. Ammonia D. Nitrous oxide
E. Nitric acid    
134.  Which allotropic form of iron is magnetic at room temperature?
A. Alpha iron B. Beta iron
C. Gamma iron D. Delta iron
E. All of the above    
135.  If during spark test, a sample gives dull red sparks, it could be
A. Cast iron B. Wrought iron
C. Mild steel D. Medium carbon steel
E. Non-ferrous material    
136.  In grey cast iron, free graphite is in the form of
A. Fine powder B. Needles
C. Flakes D. Nodules
E. Crystals    
137.  Which allotropic form of iron does not have body centred cubic lattice?
A. Alpha iron B. Beta iron
C. Gamma iron D. Delta iron
E. All of the above    
138.  Chilling, heat treatment and alloy addition to cast iron generally
A. reduces machinability B. reduces carbon percentage
C. reduces wear resistance D. improves machinability
E. None of the above    
139.  The number of atoms per unit cell in BCC is
A. 9 B. 3
C. 4 D. 6
E. 8    
140.  Manganese is added to steel primarily to increase
A. Tensile strength B. Fatigue strength
C. Ductility D. Endurance limit
E. Malleability    

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