MCQ
1461. What is to be added in an electric line to increase voltage?
Capacitor
Resistor
Inductor
All
1462. Dhaka Power Distribution Company Limited distributes power to-
Dhaka City and Narayanganj
Dhaka City and Saver
Dhaka City and Tongi
All of the above
1463. How many electricity transmission utilities are there in Bangladesh?
4
01
6
65
1464. For a single circuit 3 phase line the inductance per phase per km is of the order of--
1mH
0.2mH
10 mH
0.1 mH
1465. Which of the following statement is true?
at higher voltage cost of transmission is reduced
at higher voltage cost of transmission is increased
at higher voltage efficiency is increased
all of these
1466. The transmission lines generally use-
copper
all aluminium conductor
ACSR conductor
none
1467. Modern high-voltage lines are designed with a safety factor of about --
1.5
2
3
4
1468. When a load of leading pf the full load secondary voltage of a transformer is-its no-
load voltage.
equal to
greater than
less than
1469. For a distortionless transmission line --
R/L = G/C
RG=LC
RL= GC
RLGC-0
1470. As compard to overhead system, the maintenance cost of underground system is--
very high
very low
same
none above
1471. The line voltage on the LT side of a distribution transformer is--
400V
230V
11KV
33kV
1472. The effect of corona is-
increased energy loss
increased reactance
increased inductance
all of above
1473. Advantages of higher transmission voltage is/are-
power transfer capability of the transmission line is increase
transmission line losses are reduced
area of cross section and volume of the conductor is reduced
all of those
1474. Which of the connections is best suited for 3-phase 4-wire service?
Δ-Δ
Y-Y
Δ -Y
Δ-Υ
1475. Ferranti effect will not occur in which of the transmission lines?
long transmission line
short transmission line
medium transmission line
all of these
1476. The distribution transformer is generally connected in--
Delta/Delta
Star/Delta
Star/Star
Delta/Star
1477. How many electricity distribution utilities are there in Bangladesh?
4
6
5
none
1478. Under the condition of maximum power transfer, the efficiency is --
100%
50%
75%
25%
1479. Corona is observed on--
ac transmission lines only
dc transmission lines only
both a & b
none
1480. Objectives of power system is/are-
cost of electrical energy per kWh is to be minimum
rated voltage and frequency has to be supplied to the consumers
both a & b
neither a or b