The disadvantage with paper as insulating material is____________?

A. unsheathed cables
B. armoured
C. PVC sheathed cables
D. all of the above

A. absence of harmonics
B. non-existence of any stability limit
C. smaller dielectric loss
D. absence of ripples
E. none of the above

A. low cost
B. high dielectric strength
C. high mechanical strength
D. all of the above

A. composite
B. porous
C. homogeneous
D. hygroscopic

A. Yes
B. No

A. between 2 and 3
B. between 5 and 6
C. between 8 and 10
D. between 12 and 14