The main objective of load frequency controller is to apply control of
In a transmission line, capability is increased by_________.
What should be the minimum clearance for laying power cables near communication
line (horizontally and vertically)?
Transposition of a transmission line
is done to
The main objectives of load frequency
control in a power system are
1. To bring the steady state error to zero after load change.
2. To maintain the net tie-line flow.
3. To maintain voltages on all buses.
4. To economize the cost of generation.
Stability of a system is not affected by_________.
for exact compensation of voltage drop in the feeder, the booster must
Prevention of interference with neighboring
telephone lines can be done by
The voltage regulator having dead
zero effect is
In a transmission line, the mid-point voltage is maintained to V by a compensating
device as shown in the circuit below. What is the real power flow through the line?
The function of shunt reactor is :
In a power system, active power control is related to :
Stability of a transmission line can be increased by
The speed regulation parameter R o f a control area is 0.025 Hz/MW and load
frequency constant D is 2 MW/Hz. the area frequency response characteristic (AFRC)
is
Installation of capacitors at suitable locations and of optimum size in a distribution
system results in
1. Improved voltage regulation
2. Reduction in distribution power losses
3. Reduction of kVA rating of distribution
transformers.
Select
the correct answer using the codes given below :
For equilateral spacing of conductors of an untransposed three phase, we Have :
For a fully transposed
transmission line________.
Voltage of a bus can be controlled by controlling the________.
The voltage of transmission can be regulated
In three-phase transmission lines, the exchange of conductor positions
at regular intervals along the line is called________.
Wave trap is used to trap waves of :
The real part of the propagation constant of a transmission line is :
If a line of surge impedance Z0 is terminated in an
impedance Z
reflection for current and voltage surges at the termination are given
respectively By
The coefficient of reflection of voltage
for a short circuited line is :
A long overhead lossless power transmission line is terminated with its
characteristic impedance. While the line is in operation
A rectangular voltage wave is impressed on a loss-free overhead line,
with the far end of the line being short-circuited. On reaching the end of this
line is reflected back with the voltage wave with is reflected back with the
voltage wave with
A travelling wave 400/1/50 means crest value of
If a travelling-wave travelling along a loss-free overhead line does not result in any reflection after it has reached the far end, then the far end of the line is
The reflection coefficient for the transmission line shown in figure below at point P is
For a line characteristics impedance z0
terminated in load 
coefficient is
The time taken for a surge to travel 600 km long over head transmission line is
The line trap unit employed in carrier current relaying which is turned to carrier
frequency
Which of following statements is not true for transpositions of
conductors?
Different
types of insulators used for transmission lines are________.
High voltage transmission lines use________.
In transmission lines the cross-arms are made of_________.
Which of the
following is TRUE for wooden poles used in electric power distribution?
Voltage distribution across disc of strings of suspension insulator
assembly is
To damp
vibration in overhead lines, the following measures are taken :
(i)A light
anchor clamp of low inertia is used.
ii) Reinforcement or armour rods are used.
(iii) Dampers are used to absorb the vibrations.
Which of the above are true?
An anchor or
down guy used at the ends of polelines in order to counter balance. The pull of
the line conductors is generally known as :
The most important components required for transmission line are
In ACSR
conductors, insulation between aluminum and steel conductor is :
The
conductors of the overhead lines are
The mechanical test is done on which type of insulator?
Which type of
insulators are used on 132 kV transmission lines?
What is the
full form of RCC poles?
A steel-cored
aluminium conductor central core of_______wires surrounded number of_______.
In a
suspension type insulator the voltage_______?
In suspension
type insulator the potential is :
If the number
of poles in an 11 kV transmission line is 80, then how many disc insulators are
required?