Transmission and distribution

5. Owing to skin effect

Current flows through the half cross-section of the conductor
Portion of the conductor near the surface carries more current and core of the conductor carries less current
Portion of the conductor near the surface carries less current and core of the conductor carries more current
Any of the above

Detailed SolutionOwing to skin effect

6. As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only

31.25 percent of copper
33.3 percent of copper
distributor, a 3-wire distributor with same maximum voltage to earth uses only A. 31.25 percent of copper B. 33.3 percent of copper C. 66.7 percent of copper
125 percent of copper

Detailed SolutionAs compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only

7. Which of the following is the demerit of a ‘constant voltage transmission system’?

Increase of short-circuit current of the system
Availability of steady voltage at all loads at the line terminals
Possibility of better protection for the line due to possible use of higher terminal reactants
Improvement of power factor at times of moderate and heavy loads

Detailed SolutionWhich of the following is the demerit of a ‘constant voltage transmission system’?

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