The coils of D.C. motor starter are wound with wire of
nichrome
manganin
copper
kanthal
manganin
The kinetic energy of a bounded electron is
less than that of unbounded electron
greater than that of unbounded electron
equal to that of unbounded electron
infinite
less than that of unbounded electron
The conductivity of a conductor can be increased by
increasing its vibration
decreasing its vibration
increasing its temperature
decreasing its temperature
decreasing its temperature
Superconductivity is observed for
infrared frequencies
a.c. and high frequency
d.c. and low frequency
frequencies having no effect
d.c. and low frequency
The superconductivity is due to
the crystal structure having no atomic vibration at 0°K
none of the above
the electrons jump into nucleus at 0°K
all electrons interact in the super-conducting state
the crystal structure having no atomic vibration at 0°K
Superconductors are becoming popular for use in
generating very strong magnetic field
generating electrostatic field
manufacture of bubble memories
generating regions free from magnetic field
generating very strong magnetic field
Mercury as an electric contact material is
a gas
a metal liquid
a liquid
a metal
a metal liquid
An H.R.C. fuse is
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
a ceramic body having metal and caps
Which of the following variety of copper has the best conductivity ?
Copper containing traces of silicon
Hard drawn copper
Induction hardened copper
Pure annealed copper
Pure annealed copper
Constantan contains
silver and tin
copper and tungsten
copper and nickel
tungsten and silver
copper and nickel
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