A
Three-phase transmission line of negligible resistance and capacitance has an
inductive reactance of 100 ohms per phase. When the sending-end and
receiving-end voltages are maintained at 110 kV, the maximum power that can be
transmitted will be
As the transmission voltage increases, the percentage resistance drop
The
effect of transmission line capacitance may I be ignored without much error if
the lines are :
The main consideration for operating transmission line at high voltage
is
In
case of nominal-T representation of medium length transmission lines, the shunt
capacitance can be :
The
higher the voltage in the transmission line, the current which will flow
transmission line for transmitted will be
In
transmission line, the voltage regulation is negative whenever receiving end
voltage VR
The
efficiency of a transmission line
If X
With
the increase in the load power factor, the efficiency of the transmission line
The
permissible variation in distribution voltage is
If 5000 kW power is transmitted at 220 kV in place of 11 kV. Reduction
in current will be :
The shunt capacitance of a transmission line is neglected only
resistance and series inductance are considered. The voltage regulation of the
transmission line is zero. The power factor of the load connected at receiving
end of the line must be.
With
the increase in the value of voltage and power factor, the cost of transmission
line conduct
In
high power lines the power is transmitted at :
Regulation
of a line is defined as percentage________in voltage with________sending
end voltage when the load is thrown off
at the receiving end voltage :
Consider
the following statements :
High
voltage is used in long distance power transmission in order to :
A.
Reduce the time of transmission
B.
Reduce the transmission losses
C.
make the system reliable Out of these,
The
correct statements are?
State whether the following
regarding transmission of power at voltage are true or false.
(i) It reduces volume of conductor required.
(ii) It increase transmission efficiency
(iii) It decrease the cost transformers,
switchgear and other terminal apparatus.
The
power transfer in long transmission lines is limited by :
If
a short transmission line is delivering to lagging power factor load, the
sending end power factor is
As
per I.E. rules, variation of voltage of extra high voltage shall not exceed by
more than
A
three phase transmission line delivers a load of 5 MW at 0.8 power factor
lagging. Resistance of each conductor is 0.5 ohm / km. Receiving end voltage is
33 kV. If the line loss is not to exceed 10%, determine the length of the line,
A
220 kV, 3 phase transmission line is 60 km long. The resistance is 0.15 ohm /
km and the inductance is 1.4 mH / km. Use the short line model to find the
power at the sending end when the line is supplying a three phase load of 300
MVA at 0.8 pf lagging at 220 kV.
A
single phase 60 Hz generator supplies an inductive load of 4500kW at a power
factor of 0.80 lagging by means of a 20 km long overhead transmission line. The
line resistance and inductance are 0.0195 ohm and 0.60 mH per km. The voltage
at the receiving end is required to be kept constant at 10.2 kV. Find the
voltage regulation of the line,
The
advantage of transmitting power at high voltage is
When
transmission voltage is increased, the line losses are :
The
coefficient of reflection of voltage for short circuited line is
When
the load impedance is equal to the characteristic impedance of the transmission
lines, then the reflection coefficient and standing wave ratio are,
respectively_______.
In
nominal 
method, the line to
neutral capacitance is :
Power
is transmitted over transmission lines on high voltage, because :
In
a 3-phase overhead transmission line, the sending end voltage VS
In
a short transmission line, resistance and reactance are found to be equal and
load regulation appears to be zero, the load will
The
efficiency of transmission increase as :
Stepping
up of voltage during transmission is done to
_________voltage
regulation is considered to be the best for transmission lines?
In
the analysis of short transmission lines, which of the following is neglected?
If X
is the resistance/phase
of a short transmission line, what is the power factor angle of the load for
maximum voltage regulation?
The
effective length of a short transmission line is less than_________.
The
percentage voltage regulation of transmission lines is computed as :
(Where s
The
given figure represents :
_________is
the symbol used for shunt conductance (one of the parameters of electric
transmission line conductor
For_________,
the total resistance, inductance and capacitance (line parameters) are
considered as uniformly distributed.
In
Nominal-T configuration of medium transmission line, the shunt capacitance is
assumed to be :
The
positive sequence current of a transmission line is
The
charging current in a transmission line
The
leakage current in the transmission lines is referred to as the
In
a transmission line one terminated by characteristic impedance,Z0
One
end of a loss-less transmission line having the characteristics impedance of 
and length of 1 cm is
short-circuited. At 3 GHz, the input impedance at the other end of transmission
line is
A 2-wire system has the voltage at the supply end maintained at 500. The
line is 3 km long. If the full-load current is 120 A, what must be the booster
output in order that the far end voltage may also be 500 V. Take the resistance
of cable at the working temperature as 0.5 ohm/kilometer.
The voltage at the two ends of a line are 132 kV and its reactance is 40
ohms. The capacity of the line is :