Transmission and Distribution

A feeder, in a transmission system, feeds power to________________? A. distributors B. generating stations C. service mains D. all of the above

The presence of ozone due to corona is harmful because it________________? A. reduces power factor B. corrodes the material C. gives odour D. transfer energy to the ground E. none of the above…

For an overhead line, the surge impedance is taken as________________? A. 20-30 ohms B. 70—80 ohms C. 100—200 ohms D. 500—1000 ohms E. none of the above

Which of the following is usually not the generating voltage ? A. 6.6 kV B. 8.8 kV C. 11 kV D. 13.2 kV

As compared to a 2-wire D.C. 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 D. 125 percent…

A uniformly-loaded D.C. distributor is fed at both ends with equal voltages. As compared to a similar distributor fed at one end only, the drop at the middle point is______________? A. one-fourth B. one-third C. one-half…

Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased 100 percent, saving in copper is____________________? A. 25 percent B. 50 percent C. 75 percent D. 100 percent…

Large industrial consumers are supplied electrical energy at__________________? A. 400 VB. 11 kV C. 66 kV D. 400 kV

The spacing between phase conductors of a 220 kV line is approximately equal to________________? A. 2 m B. 3.5 m C. 6 m D. 8.5 m

The minimum clearance between the ground and a 220 kV line is about_________________? A. 4.3 m B. 5.5 m C. 7.0 m D. 10.5 m