The conductors have transport phenomena of electrons due to____________?
(A) electric field
(B) magnetic field
(C) electromagnetic field
(D) none of the above
Which of the following resistive materials has the lowest temperature co-efficient of resistance ?
(A) Nichrome
(B) Constantan
(C) Kanthal
(D) Molybdenum
Mercury as an electric contact material is_______________?
(A) a liquid
(B) a metal
(C) a metal liquid
(D) a gas
On which of the following factors does the resistivity of a material depend ?
(A) Resistance of the conductor
(B) Area of the conductor section
(C) Length of the conductor
(D) All of the above
The value of critical field below the transition temperature will_______________?
(A) increase
(B) decrease
(C) remain unchanged
(D) any of the above
High resistivity materials are used in_____________?
(A) precision instruments
(B) heating elements
(C) motor starters
(D) incandescent lamps
(D) all of the above
In a superconductor the value of critical density depends upon______________?
(A) magnetic field strength
(B) temperature
(C) either (A) or (B)
(D) both (A) and (B)
Overhead telephone wires are made of_____________?
(A) aluminium
(B) steel
(C) ACSR conductors
(D) copper
Which of the following variety of copper has the best conductivity ?
(A) Induction hardened copper
(B) Hard drawn copper
(C) Pure annealed copper
(D) Copper containing traces of silicon