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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Which of the following relays is used on long transmission lines?
Which of the following relays is used on long transmission lines?
A. Impedance relay
B. Mho’s relay
C. Reactance relay
D. None of the aboveOverhead system can be designed for operation up to____________?
Overhead system can be designed for operation up to____________?A. 11 kV
B. 33 kV
C. 66 kV
D. 400 kVThe operating voltage of supertension cables is up to_________________?
The operating voltage of supertension cables is up to_________________?
A. 3.3 kV
B. 6.6 kV
C. 11 kV
D. 33 kVThe spacing between phase conductors of a 220 kV line is approximately equal to________________?
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 mThe 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 yearsFor which of the following equipment current rating is not necessary?
For which of the following equipment current rating is not necessary?
A. Circuit breakers
B. Isolators
C. Load break switch
D. Circuit breakers and load break switches