Electrical Engineering Materials Set 1

Critical magnetic field ✘ Transition temperature ✘ Critical current density ✘ None of the above ✔

Porcelain ✘ Slate ✘ Asbestos ✘ Glass ✔

A ceramic body having metal and caps ✘ A wire of platinum ✘ A heavy cross-section of copper or aluminium ✘ A ceramic tube having carbon rod inside it ✔

Copper ✘ Nichrome ✘ Platinum ✘ Manganin ✔

Forward biasing voltage ✘ Reverse biasing voltage ✘ Temperature ✘ The amount of doping ✔

Transformer, motor and generator windings ✘ Transmission and distribution lines ✘ House wiring ✘ All above applications ✔

Linear ✘ Hexagonal ✘ Orthorhombic ✘ Cubic ✔

0.15 eV ✘ 0.25 eV ✘ 0.5eV ✘ 0.7eV ✔

Vacuum tubes ✘ Copper conductors ✘ Ferrite cores ✘ Transistors ✔

Copper points offer low contact resistance ✘ Copper can be easily soldered and welded ✘ Copper windings are less bulky and the machines become compact ✘ All of the above ✔