To improve the machinability of steel, it is generally subjected to

To improve the machinability of steel by its softening, it is subjected to

A

Cold working

B

Annealing

C

Shot blasting

D

Heating

The machinability of steel is improved by adding

A

Nickel

B

Chromium

C

Nickel and chromium

D

Sulphur, lead and phosphorus

The machinability of steel is increased by

A

Silicon and sulphur

B

Phosphorous, lead and sulphur

C

Sulphur, graphite and aluminium

D

Phosphorous and aluminium

Addition of __________ to steel does not help in improving its machinability.

A

Sulphur

B

Silicon

C

Lead

D

Phosphorous

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

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 aluminium increases when _________ is added to aluminium.

A

Copper

B

Magnesium

C

Silicon

D

Lead and bismuth

The correct sequence for descending order of machinability is

A

Grey cast iron, low carbon steel, wrought iron

B

Low carbon steel, grey cast iron, wrought iron

C

Wrought iron, low carbon steel, grey cast iron

D

Wrought iron, grey cast iron, low carbon steel

An important geometrical quantity in the cutting of metals which can be used as a criterion for machinability of metals is

A

Cutting speed

B

Feed rate

C

Shear angle

D

Tool geometry

To improve the machinability of steel, it is generally subjected to

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