TRANSMISSION AND DISTRIBUTION OF ELECTRICITY -3

21. The material commonly used for sheaths of underground cables is _________
lead
rubber
copper
iron
22.Which of the following is usually not the generating voltage?
6.6 KV
8.8 KV
11 KV
13.2 KV
23. A 3-phase 4 wire system is commonly used on __________
primary transmission
secondary transmission
primary distribution
secondary distribution
24. Which of the following distribution systems is more reliable?
radial system
. tree system
. ring main system
all are equally reliable
25. Which of the following regulations is considered best?
50 %
20 %
10 %
2 %
26. In A.C.S.R. conductors, the insulation between aluminium and steeel conductors is _____________
insulin
bitumen
varnish
no insulation is required
27. In aluminium conductors, steel core is provided to _________
. compensate for skin effect
neutralise proximity effect
reduce line inductance
increase the tensile strength
28. By which of the following a bus-bar is rated?
. current only
current and voltage
. current, voltage and frequency
. current, voltage, frequency and short time current
29. A circuit if disconnected by isolators when _________
line is energized
there is no current in the line
line is on full load
. circuit breaker is not open
30. In a substation the following equipment is not installed _________
exciters
series capacitors
shunt reactors
voltage transformers
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