Which of the following methods is used for laying of underground cables ?
Which of the following methods is used for laying of underground cables ?
A. Direct laying
B. Draw-in-system
C. Solid system
D. All of the above
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Overhead lines generally use__________________?
Overhead lines generally use__________________?
A. copper conductors
B. all aluminium conductors
C. A.C.S.R. conductors
D. none of theseFor aluminium, as compared to copper, all the following factors have higher values except:
For aluminium, as compared to copper, all the following factors have higher values except:
A. specific volume
B. electrical conductivity
C. co-efficient of linear expansion
D. resistance per unit length for same cross-sectionOwing to skin effect:
Owing to skin effect:
A. current flows through the half cross-section of the conductor
B. portion of the conductor near the surface carries more current and core of the conductor carries less current
C. portion of the conductor near the surface carries less current and core of the conductor carries more cur¬rent
D. any of the above
E. none of the aboveThe loads on distributors systems are generally__________________?
The loads on distributors systems are generally__________________?
A. balanced
B. unbalanced
C. either of the above
D. none of the aboveThe operating voltage of extra high tension cables is upto_______________?
The operating voltage of extra high tension cables is upto_______________?
A. 6.6 kV
B. 11 kV
C. 33 kV
D. 66 kV
E. 132 kVThe material commonly used for sheaths of underground cables is______________?
The material commonly used for sheaths of underground cables is______________?
A. lead
B. rubber
C. copper
D. iron