Related Questions

The process which improves the machinability of steels, but lowers the hardness and tensile strength is
A Normalising
B Full annealing
C Process annealing
D Spheroidising
The machinability of steel is improved by adding
A Nickel
B Chromium
C Nickel and chromium
D Sulphur, lead and phosphorus
For hardening alloy steels and high speed steels, they are heated to
A 1100 to 1300°C
B 1300 to 1500°C
C 500 to 600°C
D 700 to 900°C
'Killed steels' are those steels
A Which are destroyed by burning
B Which after their destruction are recycled to produce fresh steel
C Which are deoxidized in the ladle with silicon and aluminium
D In which carbon is completely burnt
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
Ferric stainless steels compared to austenitic stainless steels
A Have lower corrosion resistance
B Are harder to fabricate
C Are less ductile and hence less suitable for cold pressing
D All of the above
The specific cutting energy used for establishing the machinability of the metal depends upon its
A coefficient of friction
B micro-structure
C work hardening characteristics
D all of the mentioned
The factor considered for evaluation of machinability is
A Cutting forces and power consumption
B Tool life
C Type of chips and shear angle
D All of these
To improve the machinability of steel by its softening, it is subjected to
A Cold working
B Annealing
C Shot blasting
D Heating
To improve the machinability of steel, it is generally subjected to
A Spheroidising
B Tempering
C Normalising
D Annealing

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