Transmission and Distribution

A uniformly-loaded D.C. distributor is fed at both ends with equal voltages. As compared to a similar distributor fed at one end only, the drop at the middle point is______________?

A. one-fourth
B. one-third
C. one-half
D. twice
E. none of the above

Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased 100 percent, saving in copper is____________________?

A. 25 percent
B. 50 percent
C. 75 percent
D. 100 percent

A. 400 V
B. 11 kV
C. 66 kV
D. 400 kV

The spacing between phase conductors of a 220 kV line is approximately equal to________________?

A. 2 m
B. 3.5 m
C. 6 m
D. 8.5 m

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

The material commonly used for sheaths of underground cables is______________?

A. lead
B. rubber
C. copper
D. iron

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

A. aluminium
B. steel
C. brass
D. copper

In transmission lines the cross-arms are made of________________?

A. copper
B. wood
C. R.C.C.
D. steel

Overhead lines generally use__________________?

A. copper conductors
B. all aluminium conductors
C. A.C.S.R. conductors
D. none of these

The power factor of industrial loads is generally______________?

A. unity
B. lagging
C. leading
D. zero