The 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
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The distributors for residential areas are______________?
The distributors for residential areas are______________?
A. single phase
B. three-phase three wire
C. three-phase four wire
D. none of the aboveThe angular displacement between two interconnected stations is mainly due to___________?
The angular displacement between two interconnected stations is mainly due to___________?
A. armature reactance of both alternators
B. reactance of the interconnector
C. synchronous reactance of both the alternators
D. all of the aboveWhich of the following D.C. distribution system is the simplest and lowest in first cost ?
Which of the following D.C. distribution system is the simplest and lowest in first cost ?
A. Radial system
B. Ring system
C. Inter-connected system
D. None of the aboveThe current drawn by the line due to corona losses is___________?
The current drawn by the line due to corona losses is___________?
A. non-sinusoidal
B. sinusoidal
C. triangular
D. squareThe effect of corona can be detected by___________?
The effect of corona can be detected by___________?
A. presence of ozone detected by odour
B. hissing sound
C. faint luminous glow of bluish colour
D. all 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 kV