Related Questions

Addition of silicon to aluminium results in
A Improvement of casting characteristics
B Improvement of corrosion resistance
C One of the best known age and precipitation hardening systems
D Improving machinability
Silicon when added to copper improves
A Machinability
B Hardness
C Hardness and strength
D Strength and ductility
Addition of nickel to copper improves its
A Machinability
B Ductility
C Strength
D Hardness
The addition of antimony in tin-based alloys improves its
A Rupture strength and hot hardness
B Impact strength and bonding strength
C Deformation resistance
D Wear resistance
Addition of zircon to silica refractory brick improves its
A Crushing strength
B Resistance to slag attack
C Neither A nor B
D Neither A nor B
The addition of which of the following improves machining of copper?
A Sulphur
B Vanadium
C Tin
D Zinc
An SCR is made of silicon and not germanium because silicon
A Is inexpensive
B Is mechanically strong
C Has small leakage current
D Is tetravalent
Silicon percentage in silicon steel used for electrical equipments is about
A 1
B 4.0
C 8
D 14
Silicon percentage in the silicon steel used for electrical appliances/equipments is
A 0.3-0.4
B 12-14
C 3-4
D 20-25
When a piece of pure silicon is doped with aluminium, then
A the conductivity of the doped silicon piece will remain the same
B the doped silicon piece will become n-type
C the doped silicon piece will become p-type
D the resistivity of the doped silicon piece will increase

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