Machinability of hard alloys and tool steels is improved by

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

Machinability of hard alloys and tool steels is improved by

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