Principal alloying element in Elinvar (used for making hair springs for watches) is__________________?

Related Mcqs:

Which of the following hardness tests does not measure the indentation hardness of metals and alloys ?

A. Vickers hardness test B. Shore scleroscope test C. Brinell hardness test D. Rockwell hardness test...

The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the____________________?

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Magnetic permeability of iron is increased by its_____________________?

A. Decarburising B. Alloying with cobalt C. Purification D. Alternate heating & cooling...

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...

With increase in ___________________ Knocking tendency in a spark ignition petrol engine decreases?

A. Supercharging B. Wall temperature C. Compression ratio D. Engine speed...