MATERIAL TECH

Springs has the property of ______

• Toughness
• Hardness
• Resilience
• Ductility

Corrosion, acidity comes under ______________ property

• Physical
• Mechanical
• Chemical
• Electrical

Change of dimension (size & shape) comes under _________ property

• Physical
• Mechanical
• Chemical
• Electrical

Cast iron is mainly produced by

• Beseemer converter
• Open Hearth furance
• L.D.process
• The cupola furnace

White cast iron contain carbon in the form of

• Free carbon
• Fe 3 C (cementite)
• Coke
• Graphite

Ductile cast iron is produced by adding a small percentage (0.1-0.5%) of the following metal in very small amount to molten malleable

• Copper or nickel
• Copper or aluminium
• Magnesium or cesium
• Cobalt or nickel

Which one among the following is the by product of blast furnace

• Pig iron
• Cast iron
• Steel
• Lime stone

In cast iron carbon founds in two forms, they are

• Graphite, pearlite
• Ferrite, pearlite
• Graphite,cementite
• none of these

How are cast irons generally specified?

• By hardness
• By tensile strength
• By percentage iron
• All the above

In malleable cast iron , carbon exist in the following form

• Free carbon
• Flakes
• Cemitite
• Nodular aggergates of graphite