In a cable, the maximum stress under operating conditions is at___________?

A. 5 kV/mm
B. 15 kV/mm
C. 30 kV/mm
D. 200 kV/mm

A. blue
B. black
C. brown
D. none of the above

A. it is hygroscopic
B. it has high capacitance
C. it is an organic material
D. none of the above

A. polyvinyl chloride
B. post varnish conductor
C. pressed and varnished cloth
D. positive voltage conductor
E. none of the above

A. one half
B. double
C. four times
D. none of the above

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