There is a greater possibility of occurence of corona during______________?
There is a greater possibility of occurence of corona during______________?
A. dry weather
B. winter
C. summer heat
D. humid weather
E. none of the above
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A conductor, due to sag between two supports, takes the form of____________?
A conductor, due to sag between two supports, takes the form of____________?
A. semi-circle
B. triangle
C. ellipse
D. catenaryWhich 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 aboveBy which of the following methods string efficiency can be improved?
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 aboveThe voltage drop, for constant voltage transmission is compensated by installing__________?
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 aboveThe following system is not generally used?
The following system is not generally used?
A. 1-phase 3 wire
B. 1-phase 4 wire
C. 3-phase 3 wire
D. 3-phase 4 wireFor an overhead line, the surge impedance is taken as________________?
For an overhead line, the surge impedance is taken as________________?
A. 20-30 ohms
B. 70—80 ohms
C. 100—200 ohms
D. 500—1000 ohms
E. none of the above