Base impendence of the power system is given by :
A transmission line has a reactance of 1 Pu is operating at 
The bus bar zone faults are generally
Fault calculations using computer program are usually done by
A transmission line has
a reactance of 1 Pu is operating at 
In Newton Raphson method, the convergence is not affected by the choice
of
Stability of a power system can be
improved by :
1.
Using series compensations
2.
Using parallel transmission lines
3. Reducing voltage of transmission
Which of the above statements are correct?
Normally 
matrix is a :
The 
matrix of a 100 bus
interconnected system is 90% sparse. Hence the number of transmission lines in
the system must be :
The principal information obtained from load flow studies in a power system are :
1. Magnitude
and phase angle of the voltage at each bus.
2. Reactive and real power flows in each of
the lines.
3.
Total power loss in the network.
4. Transient stability limit of the system.
Select the correct answer using the codes given below :
For a load bus of a power system, the specified quantities are :
In load flow studies, the quantities specified a generator bus of a power system
are_______.
The full form of UTP in case of UTP
cable is :
Why is copper the material of choice for underground cable ?
The
allowable temperature for oil-filled and gas - pressure cables is :
If
cable of homogeneous insulation has
Which
of the following is NOT a method of protection of transmission lines?
Which
of the following features is NOT desirable while protecting a transmission
line?
Lightning arresters connected in power system protect electrical
equipments from :
Reactance relays are generally employed for the phase faults in :
1.
Short lines
2.
Medium lines
3.
Long Lines
The
correct amongst the give is
The
normal resistance of a pilot wire is :
If
the reactance of a single phase system in ohms is 15 ohm, find the p.u. value
for a base of 15 kVA and 10 kV.
Number
of pilot wires required for protecting 3-phase transmission lines using
translay system of protection is
Carrier current protection scheme is normally used for
Which
is the main relay for protecting up to 90% of the transmission line-length in
the forward direction?
Probability
of occurrence of all the three phase short circuited fault in transmission
system is
For an EHV equipment for maintenance first it should be isolated and
connected to ground because.
Which
type of earthing is used by transmission lines?
A
pitot relay is used for :
Pilot
relaying schemes are used for the protection of
Which
of the following is not a valid method of neutral grounding?
In a power system, each bus or anode associated with how many
quantities?
Which of the following is the preferred protection for ground fault?
Mho relay is suitable for_______transmission lines.
In
the case of transmission line protection, over current relay is used
While
estimating the overhead lines, if the number of poles required are 14, then
what is the estimated number of earth sets required?
Which
of the following equipments is used to limit short-circuit current level in a
sub-station?
Solid state power supplies are protected from medium surge voltage using
:
The
phenomenon of intermittent arc taking place in line to ground fault of a
3-phase system with consequent production of transients is known as :
Counterpoise
is used for.
The relay best suited for phase fault relaying medium transmission lines
is
The
ground wires protect the transmission lines against
First
zone distance relay protects a transmission line section upto about
Reactance
relays are employed for phase fault in :
Mho
relay is normally used for the protection of
For the bus admittance matrix 
of a 4-bus system
given in per unit, the buses having shunt elements are________.
A transmission line has 0.2 pu impedance on a base of 132 kV, 100 MVA.
On a base of 220 kV, 50 MVA, it will have a pu impedance of_________.
Method of voltage
control adopted foi transmission lines in A.C. systems is :
An automatic power factor controller cannot achieve
To meet the reactive power requirements at centres usually :