The material generally used for armour of high voltage cables is_____________?

The angular displacement between two interconnected stations is mainly due to___________?

A. armature reactance of both alternators
B. reactance of the interconnector
C. synchronous reactance of both the alternators
D. all of the above

For aluminium, as compared to copper, all the following factors have higher values except:

A. specific volume
B. electrical conductivity
C. co-efficient of linear expansion
D. resistance per unit length for same cross-section

Owing to skin effect:

A. current flows through the half cross-section of the conductor
B. portion of the conductor near the surface carries more current and core of the conductor carries less current
C. portion of the conductor near the surface carries less current and core of the conductor carries more cur¬rent
D. any of the above
E. none of the above

The operating voltage of high voltage cables is up to_______________?

A. l.lkV
B. 3.3kV
C. 6.6kV
D. llkV

A feeder, in a transmission system, feeds power to________________?

A. distributors
B. generating stations
C. service mains
D. all of the above

The underground system cannot be operated above_________________?

A. 440 V
B. 11 kV
C. 33 kV
D. 66 kV