Category: Electrical Engineering Materials

A. 1
B. 2
C. 4
D. 8

A. magnetic field strength
B. temperature
C. either (A) or (B)
D. both (A) and (B)

A. GLS lamps
B. electric arc furnace
C. dry cells
D. cinema projectors

A. Holes can exist in certain semiconductors only
B. Holes can exist in any material including conductors
C. Holes may constitute an electric current
D. Holes can be considered as a net positive charge

A. 0.15 eV
B. 0.25 eV
C. 0.5eV
D. 0.7eV

A. Carbon
B. Steel
C. Silver
D. Aluminium

A. copper and aluminium
B. tin and lead
C. nickel, copper and zinc
D. silver, copper and lead

A. electrical contacts
B. thermocouple
C. heating element in high temperature furnace
D. grids of special purpose vacuum tubes
E. all of the above

A. transfer of electrons between atoms
B. sharing of electrons between atoms
E. sharing of variable number of electrons by a variable number of atoms
D. none of the above

A. Speed of the machine
B. Contact pressure
C. Surface conditions of brush and commutator
D. Excessive sparking
E. All of the above