For which of the following equipment current rating is not necessary?

Which of the following bus-bar schemes has the lowest cost?

A. Ring bus-bar scheme
B. Single bus-bar scheme
C. Breaker and a half scheme
D. Main and transfer scheme

High voltage transmission lines use__________________?

A. suspension insulators
B. insulators
C. both A. and B.
D. none of the above

The square root of the ratio of line impedance and shunt admittance is called the___________?

A. surge impedance of the line
B. conductance of the line
C. regulation of the line
D. none of the above

The angular displacement between two interconnected stations is mainly due to___________?

A. armature reactance of both alternators
B. reactance of the interconnector
C. synchronous reactance of both the alternators
D. all of the above

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

When a conductor carries more current on the surface as compared to core, it is due to___________?

A. permeability variation
B. corona
C. skin effect
D. unsymmetrical fault
E. none of the above