Related Questions

Aluminium bronze contains aluminium and copper in the ratio of
A 50 : 50
B 40 : 60
C 60 : 40
D 10 : 90
Duralumin is an alloy of aluminium and copper. Percentage of copper in duralumin is
A 38
B 26
C 16
D 4
Due to which of the following reasons aluminium does not corrode in atmosphere ?
A Aluminium is a noble metal
B Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium
C No reaction with oxygen occurs ft Any of the above
D All of the above
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
An alloy used in making heating elements for electric heating device is
A Solder
B Alloy Steel
C Nichrome
D German Silver
In resistance heating highest working temperature is obtained from heating elements made of
A Nickel copper
B Nichrome
C Silicon carbide
D Silver
Properly of low temperature co-eflficient of heating element is desired due to which of the following reasons?
A To avoid initial rush of current
B To avoid change in kW rating with temperature
C Both (A) and (B)
D Either (A) or (B)
Properly of low temperature coefficient of heating element is desired due to which of the following reasons?
A To avoid initial rush of current
B To avoid change in kW rating with temperature
C Both (A) and (B)
D Either (A) or (B)
Due to which of the following fact, in India, aluminium is replacing copper ?
A Aluminium is more ductile and malleable than copper
B Aluminium is available in plenty, cheaper and lighter than copper
C Aluminium has lower resistivity than that of copper
D Aluminium has less temperature co-efficient than copper

Next steps