Related Questions

Nickel when added to copper improves
A Machinability
B Hardness
C Hardness and strength
D Strength and ductility
If 2 kg of metal, of which 1/3 is zine and the rest is copper , be mixed with 3 kg of metal, of which 1/4 is zinc and the rest is copper , then what will be the ratio of zinc to copper in the mixture?
A 17 : 43
B 13 : 42
C 19 : 43
D 15 : 42
If 2 kg of metal, of which 1/3 is zinc and the rest is copper s, be mixed with 3 kg of metal , of which 1/4 is zinc and the rest is copper , then what will be the ratio of zinc to copper in the mixture?
A 13 : 42
B 19 : 43
C 15 : 42
D 17 : 43
Addition of silicon to aluminium improves its
A Corrosion resistance
B Machinability
C Castability
D None of these
Addition of nickel to copper improves its
A Machinability
B Ductility
C Strength
D Hardness
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
An ore contains 26% of copper . To get 91 kgs of copper the quantity of are required is -
A 350 kg
B 240 kg
C 340 kg
D None of these

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