The loads on distributors systems are generally__________________?
(A) balanced
(B) unbalanced
(C) either of the above
(D) none of the above
The material commonly used for insulation in high voltage cables is_______________?
(A) lead
(B) paper
(C) rubber
(D) none of the above
Multicore cables generally use________________?
(A) square conductors
(B) circular conductors
(C) rectangular conductors
(D) sector-shaped conductors
(D) none of the above
The power transmitted will be maximum when____________?
(A) corona losses are minimum
(B) reactance is high
(C) sending end voltage is more
(D) receiving end voltage is more
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
(D) 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
(D) 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 of copper
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
(D) twice
(D) none of the above