The minimum clearance between the ground and a 220 kV line is about_________________?
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
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The wooden poles well impregnated with creosite oil or any preservative compound have life_____________?
The wooden poles well impregnated with creosite oil or any preservative compound have life_____________?
A. from 2 to 5 years
B. 10 to 15 years
C. 25 to 30 years
D. 60 to 70 yearsThe operating voltage of high voltage cables is up to_______________?
The operating voltage of high voltage cables is up to_______________?
A. l.lkV
B. 3.3kV
C. 6.6kV
D. llkVWhen an alternator connected to the bus-bar is shut down the bus-bar voltage will___________?
When an alternator connected to the bus-bar is shut down the bus-bar voltage will___________?
A. fall
B. rise
C. remain unchanged
D. none of the aboveFor an overhead line, the surge impedance is taken as________________?
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 aboveThe voltage of the single phase supply to residential consumers is_____________?
The voltage of the single phase supply to residential consumers is_____________?
A. 110 V
B. 210 V
C. 230 V
D. 400 VThe following system is not generally used?
The following system is not generally used?
A. 1-phase 3 wire
B. 1-phase 4 wire
C. 3-phase 3 wire
D. 3-phase 4 wire