A. underground
B. overhead
C. either of the above
D. none of the above
A feeder, in a transmission system, feeds power to________________?
A. distributors
B. generating stations
C. service mains
D. all of the above
In aluminium conductors, steel core is provided to____________?
A. compensate for skin effect
B. neutralise proximity effect
C. reduce line inductance
D. increase the tensile strength
Which of the following is the demerit of a ‘constant voltage transmission system’ ?
A. Increase of short-circuit current of the system
B. Availability of steady voltage at all loads at the line terminals
C. Possibility of better protection for the line due to possible use of higher terminal reactants
D. Improvement of power factor at times of moderate and heavy loads
E. Possibility of carrying increased power for a given conductor size in case of long-distance heavy power transmission
jCorona usually occurs when the electrostatic stress in air around the conductor exceeds?
A. 6.6 kV (r.m.s. value)/cm
B. 11 kV (r.m.s. value)/cm
C. 22 kV (maximum value)/cm
D. 30 kV (maximum value)/cm
The operating voltage of supertension cables is up to_________________?
A. 3.3 kV
B. 6.6 kV
C. 11 kV
D. 33 kV
The material commonly used for insulation in high voltage cables is_______________?
A. lead
B. paper
C. rubber
D. none of the above