The advantage of oil filled cables is_________?
The advantage of oil filled cables is_________? A. more perfect impregnation B. smaller overall size C. no ionisation, oxidation and formation of voidsD. all of the above
The advantage of oil filled cables is_________? A. more perfect impregnation B. smaller overall size C. no ionisation, oxidation and formation of voidsD. all of the above
Copper as conductor for cables is used as________? A. annealed B. hardened and tempered C. hard drawn D. alloy with chromium
Cables for 220 kV lines are invariably____________? A. mica insulated B. paper insulatedC. compressed oil or compressed gas insulated D. rubber insulated E. none of the above
If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be______________? A. 2 cm B. 10 cmC. 50 cm D. 400 cm
The insulating material should have____________? A. low permittivity B. high resistivity C. high dielectric strengthD. all of the above
The disadvantage with paper as insulating material is____________? A. it is hygroscopic B. it has high capacitance C. it is an organic material D. none of the above
Rubber is most commonly used insulation in cables A. Yes B. No
In capacitance grading a homogeneous dielectric is used A. YesB. No
Natural rubber is obtained from milky sap of tropical trees A. Yes B. No
Polyethylene has very poor dielectric and ageing properties A. YesB. No