A 3-phase 4 wire system is commonly used on________________? - PakMcqs

Related Mcqs:

1. 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 of copper...

2. Galvanised steel wire is generally used as______________?

   A. stay wire B. earth wire C. structural components D. all of the above...

3. 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...

4. The material commonly used for insulation in high voltage cables is_______________?

   A. lead B. paper C. rubber D. none of the above...

5. The material commonly used for sheaths of underground cables is______________?

   A. lead B. rubber C. copper D. iron...

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

   A. 110 V B. 210 V C. 230 V D. 400 V...

7. 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...

8. The frequency of voltage generated, in case of generators, can be increased by___________?

   A. using reactors B. increasing the load C. adjusting the governor D. reducing the terminal voltage E. none of the above...

9. 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...

10. 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...