A. insulation may melt due to higher temperature
B. skin effect dominates on the conductor
C. of corona loss between conductor and sheath material
D. there is a danger of breakdown of insulation due to the presence of voids
Related Mcqs:
- Cables, generally used beyond 66 kV are___________?
A. oil filled
B. S.L. type
C. belted
D. armoured - Which of the following insulation is used in cables ?
A. Varnished cambric
B. Rubber
C. Paper
D. Any of the above - In single core cables armouring is not done to________?
A. avoid excessive sheath losses
B. make it flexible
C. either of the above
D. none of the above - Conduit pipes are normally used to protect _______ cables
A. unsheathed cables
B. armoured
C. PVC sheathed cables
D. all of the above - In cables the charging current__________?
A. lags the voltage by 90°
B. leads the voltage by 90°
C. lags the voltage by 180°
D. leads the voltage by 180° - The intersheaths in the cables are used to_____________?
A. minimize the stress
B. avoid the requirement of good insulation
C. provide proper stress distribution
D. none of the above - Cables for 220 kV lines are invariably____________?
A. mica insulated
B. paper insulated
C. compressed oil or compressed gas insulated
D. rubber insulated
E. none of the above - Copper as conductor for cables is used as________?
A. annealed
B. hardened and tempered
C. hard drawn
D. alloy with chromium - The electrostatic stress in underground cables is_________?
A. same at the conductor and the sheath
B. minimum at the conductor and maximum at the sheath
C. maximum at the conductor and minimum at the sheath
D. zero at the conductor as well as on the sheath
E. none of the above - The advantage of cables over overhead transmission lines is___________?
A. easy maintenance
B. low cost
C. can be used in congested areas
D. can be used in high voltage circuits
