In aluminium conductors, steel core is provided to____________?
A. compensate for skin effect
B. neutralise proximity effect
C. reduce line inductance
D. increase the tensile strength
For transmission of power over a distance of 500 km, the transmission voltage should be in the range?
A. 150 to 220 kV
B. 100 to 120 kV
C. 60 to 100 kV
D. 20 to 50 kV
The material commonly used for insulation in high voltage cables is_______________?
A. lead
B. paper
C. rubber
D. none of the above
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
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-section
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 above
When the interconnector between two stations has large reactance?
A. the transfer of power will take place with voltage fluctuation and noise
B. the transfer of power will take place with least loss
C. the stations will fall out of step be¬cause of large angular displacement between the stations
D. none of the above