Due to which of the following reasons copper and aluminium are not used for heating elements ?

Related Mcqs:

The co-ordination number of a simple cubic structure is______________?

A. 2 B. 4 C. 6 D. 8...

By increasing impurity content in the metal alloy the residual resistivity always_____________?

A. decreases B. increases C. remains constant D. becomes temperature independent...

Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron?

A. increases B. decreases C. does not change...

Carbon bearings are used under which of the following conditions ?

A. Where lubrication is difficult or im-possible B. Where corrosive chemical action exists C. Where high temperature exists D. All of the above...

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...