The metallic sheath may be made of lead or lead alloy or of aluminium ?
The metallic sheath may be made of lead or lead alloy or of aluminium ?
		A. Yes
B. No
		A. Yes
B. No
		A. Yes
B. No
		A. steel tape
B. galvanised steel wire
C. any of the above
D. none of the above
		A. 200 V
B. 500 V
C. 700 V
D. 1000 V
		A. avoid excessive sheath losses
B. make it flexible
C. either of the above
D. none of the above
		A. low cost
B. high dielectric strength
C. high mechanical strength
D. all of the above