Addition of silicon to aluminium results in____________________?

Related Mcqs:

1. Aluminium bronze contains aluminium and copper in the ratio of___________________?

   A. 50 : 50
   B. 40 : 60
   C. 60 : 40
   D. 10 : 90
   E. 90 : 10

2. Addition of manganese 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
   E. none of the above

3. Addition of lead and bismuth 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
   E. none of the above

4. Addition of copper 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
   E. none of the above

5. A specimen of aluminium metal when observed under microscope shows __________________?

   A. B.C.C. crystalline structure
   B. F.C.C. crystal structure
   C. H.C.P. structure
   D. a complex cubic structure
   E. orthorhombic crystalline structure

6. Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio _____________________?

   A. 50 : 20 : 20 : 10
   B. 40 : 30 : 20 : 10
   C. 50 : 20 : 10 : 20
   D. 30 : 20 : 30 : 20
   E. 50 : 10 : 20 : 20

7. Which is false statement about properties of aluminium ___________________?

   A. modulus of elasticity is fairly low
   B. wear resistance is very good
   C. fatigue strength is not high
   D. creep strength limits its use to fairly low temperatures
   E. corrosion resistance is good

8. Aluminium bronze contains__________________?

   A. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
   B. 92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
   C. 10% aluminium and 90% copper
   D. 90% magnesium and 9% aluminium with some copper
   E. 10% aluminium and 90% tin

9. An important property of high silicon (12 – 18%) cast iron is the high__________________?

   A. tenacity
   B. brittleness
   C. plasticity
   D. corrosion resistance
   E. hardness

10. If a refractory contains high content of silicon, it means refractory is__________________?

    A. acidic
    B. basic
    C. neutral
    D. brittle
    E. none of the above