The material for armouring on cable is usually__________?

A. 5 kV/mm
B. 10 kV/mm
A. 15 kV/mm
D. 30 kV/mm

A. oil filled
B. S.L. type
C. belted
D. armoured

A. hessian cloth
B. jute
C. any of the above
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. presence of moisture
B. working temperature
C. time of application of the voltage
D. all of the above

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