By which of the following methods string efficiency can be improved?
A. Using a guard ring
B. Grading the insulator
C. Using long cross arm
D. Any of the above
E. None of the above
The voltage drop, for constant voltage transmission is compensated by installing__________?
A. inductors
B. capacitors
C. synchronous motors
D. all of above
E. none of the above
In the analysis of which of the following lines shunt capacitance is neglected?
A. Short transmission lines
B. Medium transmission lines
C. Long transmission lines
D. Medium as well as long transmission lines
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 above
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 above
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
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 above