Category: Switchgear and Protection

A. Photoelectric effect
B. Electrostatic effect
C. Heating effect
D. Magnetic effect

A. two currents
B. two voltages
C. two or more similar electrical quantities
D. none of the above

A. lengthening of the gap
B. cooling and blast effect
C. both A. and B
D. deionizing the oil with forced air
E. none of the above

A. earth wires
B. isolators
C. H.R.C. fuses
D. reactors

A. 11 kV
B. 33 kV
C. 60kV
D. 110kV

A. delayed trip action
B. instantaneous trip action
C. both of the above
D. none of the above

A. zero sequence currents only
B. positive sequence currents only
C. negative and zero sequence currents
D. zero, negative and positive sequence currents

A. is yellow in colour
B. is lighter than air
C. is nontoxic
D. has pungent small
E. none of the above

A. Generators
B. Motors
C. Transmission line
D. Transformers

A. slow making and breaking of load circuit contacts
B. foreign matter on the contact surface
C. too low contact pressure
D. all of the above