The voltage of the single phase supply to residential consumers is_____________?

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

A. Circuit breakers
B. Isolators
C. Load break switch
D. Circuit breakers and load break switches

High voltage transmission lines use__________________?

A. suspension insulators
B. insulators
C. both A. and B.
D. none 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

In a substation the following equipment is not installed?

A. exciters
B. series capacitors
C. shunt reactors
D. voltatre transformers

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

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