541. High voltage transmission lines use__________________?
A. suspension insulators
B. pin insulators
C. both A. and B.
D. none of the above

542. Multicore cables generally use________________?
A. square conductors
B. circular conductors
C. rectangular conductors
D. sector-shaped conductors
E. none of the above

543. The material commonly used for insulation in high voltage cables is_______________?
A. lead
B. paper
C. rubber
D. none of the above

544. The loads on distributors systems are generally__________________?
A. balanced
B. unbalanced
C. either of the above
D. none of the above

545. The power factor of industrial loads is generally______________?
A. unity
B. lagging
C. leading
D. zero

546. Overhead lines generally use__________________?
A. copper conductors
B. all aluminium conductors
C. A.C.S.R. conductors
D. none of these

547. In transmission lines the cross-arms are made of________________?
A. copper
B. wood
C. R.C.C.
D. steel

548. The material generally used for armour of high voltage cables is_____________?
A. aluminium
B. steel
C. brass
D. copper

549. The material commonly used for sheaths of underground cables is______________?
A. lead
B. rubber
C. copper
D. iron

550. The minimum clearance between the ground and a 220 kV line is about_________________?
A. 4.3 m
B. 5.5 m
C. 7.0 m
D. 10.5 m

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