MCQ
81. TStability of a system is not affected by-
Reactance of line
Losses
Reactance of generator
Output torque
82. A line which connects distributor to substation is called--
service mains
distributor
feeder
infinity
83. The highest point on the daily load curve represents-
average load
load factor
maximum load
none of the above
84. Potential difference to any equal charge is measured in,
coulomb
Ampere
joule
volt
85. The common fault is overhead distribution system is-
phase to phase fault
one phase to earth fault
all phase short circuited
none of the above
86. the minimum phase -neutral voltage at which corona occurs, is called-
critical disruptive voltage
visual critical voltage
fieash over voltage
none of the above
87. At distribution substation voltage is stepped down to-
66kV
132kV
11kV
415/230 Volts
88. The surge impedance for over head line is taken as-
10-202 Ω
100-200 Ω
50-600 Ω
1000-2000Ω
89. The distribution transformer is generally connected in--
Delta/Delta
Star/Delta
Star/Star
Delta/Star
90. 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
91. The ring main system is used in power distribution because it--
is reliable for continuity of supply
gives better voltages regulation
results in less feeder losses
all of the above
92. When the load factor of a power station increases, the units (kwh) generated-
are increased
remain the same
are decreased
none of these
93. Corona is affected by-
condition of atmosphere
line voltage
size & spacing of conductor
all of the above
94. For a distortionless transmission line --
R/L = G/C
RG=LC
RL= GC
RLGC-0
95. In de transmission, the skin effect is-
large
zero
small
depends on voltage
96. Modern high-voltage lines are designed with a safety factor of about --
1.5
2
3
4
97. The most severe unsymmetrical fault is-
single line-to-ground fault
line-to-line fault
double line-to-ground fault
none of the above
98. The line voltage on the LT side of a distribution transformer is--
400V
230V
11KV
33kV
99. Capacitance of a transmission line is the result of-
Potential diference between the conductors
Current flow in both conductors
Current flow in either conductors
Charge per unit current
100. Which of the following is not the distribution system, normally used-
3 phase 4 wire
Single phase-3 wire
Single phase -4 wire
3 phase-3 wire