Machinability of hard alloys and tool steels is improved by_____________________?

Related Mcqs:

1. Pick out the wrong statement about the machinability of metals. Machinability of a metal ?

   A. Decreases with increase in strain hardening tendencies
   B. Decreases with increase in hardness, in general
   C. Depend on the composition, microstructure and physical & mechanical properties
   D. Decreases with increases in tensile strength & decrease in grain size

2. Steels with high carbon equivalent have poor Weldability, because in these steels during welding________________?

   A. Carbon and other alloying elements get oxidised from the weld pool
   B. Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld
   C. Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld
   D. Segregation of carbon and other element occurs in the weld pool leading to poor properties of
   the weld

3. Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are ?

   A. Cobalt, chromium & tungsten
   B. Cobalt, chromium & nickel
   C. Molybdenum, tungsten & chromium
   D. Cobalt, zirconium & molybdenum

4. Addition of _______________ to steel does not help in improving its machinability ?

   A. Sulphur
   B. Silicon
   C. Lead
   D. Phosphorous

5. To improve the machinability of steel, it is generally subjected to _____________________?

   A. Spheroidising
   B. Tempering
   C. Normalising
   D. Annealing

6. Addition of ____________________ to steel does not help in improving its machinability?

   A. Sulphur
   B. Silicon
   C. Lead
   D. Phosphorous

7. Fine grained steels have____________________?

   A. High brittleness
   B. Higher tendency to distort
   C. High ductility
   D. None of these

8. Most important property of steels for use in automobile bodies is the___________________?

   A. Formability
   B. Yield strength
   C. Toughness
   D. Resilience

9. Earing is a defect found in steels after the following metal working operation ?

   A. Extrusion
   B. Rolling
   C. Deep drawing
   D. Wire drawing

10. Coarse grained steels have____________________?

    A. Low toughness
    B. No tendency to distort
    C. High density
    D. Very high toughness