High voltage transmission lines use__________________?
High voltage transmission lines use__________________?
A. suspension insulators
B. insulators
C. both A. and B.
D. none of the above
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The 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 aboveWhen a conductor carries more current on the surface as compared to core, it is due to___________?
When a conductor carries more current on the surface as compared to core, it is due to___________?
A. permeability variation
B. corona
C. skin effect
D. unsymmetrical fault
E. none of the aboveOverhead lines generally use__________________?
Overhead lines generally use__________________?
A. copper conductors
B. all aluminium conductors
C. A.C.S.R. conductors
D. none of theseThe phenomenon qf rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the________________?
The phenomenon qf rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the________________?
A. Seeback effect
B. Ferranti effect
C. Raman effect
D. none of the aboveIn transmission lines the cross-arms are made of________________?
In transmission lines the cross-arms are made of________________?
A. copper
B. wood
C. R.C.C.
D. steelAs compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only__________________?
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