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

Which of the following elements does not impart hardness to steel__________________?

A. Copper
B. Chromium
C. Nickel
D. Silicon

Melting point of iron is__________________?

A. 1539°c
B. 1601°c
C. 1489°c
D. 1712°c

The hardness of steel increases if it contains____________________?

A. Austenite
B. Martensite
C. Pearlite
D. Cementite

Nodular iron has____________________?

A. high maehinability
B. low melting point
C. high tensile strength
D. good fluidity

Cobalt in steel __________________?

A. Improves wear resistance, cuttinability and toughness
B. Refines grain size and produces les tendency to carburisation, improve corrosion and heat resistant proper ties
C. Improves cutting ability and reduce hardenability
D. Gives ductility, toughness, tensile strength and anti corrosion property:

Tensile strength of steel can be safely in-creased by________________?

A. Adding carbon up to 2.8%
B. Adding carbon up to 6.3%
C. Adding carbon up to 0.83%
D. Adding small quantities of copper

Tungsten in high speed steel provides________________?

A. Hot hardness
B. Toughness
C. Wear resistance
D. Sharp cutting edge

Connecting rod is usually made of_________________?

A. Aluminium
B. Low carbon steel
C. Medium carbon steel
D. High carbon steel

Sulphur in steel________________?

A. Acts as deoxidiser
B. Reduces the grain size
C. Decreases tensile strength and hardness
D. Lowers the toughness and transverse ductility