Materials and Construction
Presence of silicon in steel

None of these
Indicates that steel is not deoxidised properly
Is in the form of free Si
Decreases the blow holes formation tendency in castings

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Materials and Construction
Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its

High strength and corrosion & oxidation-resistance at elevated temperature
Its ability to be cast, rolled, forged & stamped
High strength to weight ratio
Low temperature strength properties

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