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WorksheetsEE PC 423 quiz 3 (network calculation & fault analysis)
Total questions: 40
Worksheet time: 1hrs 18mins
Power flow studies are the backbone of power system analysis and design
True
False
What is is commonly used for many power system analysis?
nodal-voltage method
Thevenin Theorem
mesh analysis
superposition
What matrix is used for relating the nodal voltages
to the currents that flow into and out of network
using the admittance values of circuit branches?
Hint: three words
(a)
In the network model of an interconnected power
system, what represent substation bus bars?
nodes
branches
load
source
In the network model of an interconnected power
system, what represent transmission lines and transformers?
nodes
branches
load
source
In constructing the Y-bus matrix, the impedances are converted to what?
(a)
The equivalent of the bus admittance matrix is
known as the bus impedance matrix
True
False
In matrix, what is a square matrix with 1s on the diagonal and zeros everywhere else?
Identity Matrix
Zero Matrix
Scalar Matrix
One matrix
Matrix Inverse: Needed to perform the “division” of 2 square matrices
True
False
A matrix is considered singular if the determinant of the matrix is equals to?
zero
one
undefine
infinity
A (a) in a power system or circuit is a failure which interferes with the normal flow of current.
The faults are associated with abnormal change in_____________ of the power system
current
voltage
frequency
impedance
admittance
Shunt faults are also called ______ faults.
short circuit
open circuit
symmetrical
asymmetrical
Series faults are also called ______ faults.
short circuit
open circuit
symmetrical
asymmetrical
The shunt faults are characterized by increase in current and fall in voltage and frequency
True
False
The series faults are characterized by increase in voltage and frequency and fall in current in the faulty
phase
True
False
What fault has highest occurrence in the power system?
3-Phase fault
Double line to ground fault
Line to line fault
Single line to ground fault
What fault has lowest occurrence in the power system?
3-Phase fault
Double line to ground fault
Line to line fault
Single line to ground fault
What fault has the highest severity in the power system?
3-Phase fault
Double line to ground fault
Line to line fault
Single line to ground fault
What fault has the lowest severity in the power system?
3-Phase fault
Double line to ground fault
Line to line fault
Single line to ground fault
What type of fault on the power system which gives rise to equal fault currents in the lines with 120 degrees displacement?
symmetrical fault
asymmetrical fault
shunt fault
series fault
What type of fault on the power system which gives rise to unequal fault currents in the lines with unequal phase displacement?
symmetrical fault
asymmetrical fault
shunt fault
series fault
What are the three ways in which unsymmetrical faults may occur in a power system?
Single line-to-ground fault
Line-to-line fault
Double line-to-ground fault
Three-phase short circuit fault
Three-phase-to-ground fault
In symmetrical AC component of the fault current, what is first cycle or so after the fault – AC current is very large and falls rapidly?
Subtransient
Transient
Steady-state
What is a bus that is not connected to a generator?
Load Bus
Generator Bus
Slack Bus
What is a bus that is a special generator bus serving as the reference bus for the power system.
Load Bus
Generator Bus
Slack Bus
The load-flow output, all bus voltage magnitudes and phase angles w.r.t the slack bus.
True
False
(a) is deduced by summing complex power at all loads and generators and subtracting the totals.
The least important information obtained from the load-flow is the system voltage profile.
True
False
A power-flow program can be set up to provide alerts if the voltage at any given bus exceeds the __________
nominal value
maximum value
minimum value
exact value
(a) is an interconnected network for
delivering electricity from suppliers
to consumers.
What is the type of generation plant is the major source of electricity for Mindanao Grid?
Coal
Diesel
Geothermal
Hydro
What does SOCOTECO means?
(a)
In Power Flow analysis, the first step is "Represent the power system by its one-line diagram".
True
False
In Power Flow analysis, it is not necessary to convert all quantities to per unit (pu).
True
False
In Power Flow analysis, which one is done first? Draw the impedance diagram or Determine the YBUS
Draw the impedance diagram
Determine the YBUS
In power system analysis, what method solving the power flow equations is "Direct solutions to linear algebraic equations"
Gauss Elimination
Jacobi method
Gauss-Siedel method
Newton-Raphson method
In power system analysis, what method solving the power flow equations is "Iterative solutions to nonlinear algebraic equations"?
Gauss Elimination
Jacobi method
Gauss-Siedel method
Newton-Raphson method
In power system analysis, what method solving the power flow equations is "Iterative solutions to linear algebraic equations"?
Gauss Elimination
Jacobi method
Gauss-Siedel method
Newton-Raphson method
Power Flow Analysis is very crucial during the power-system planning phases as well as during periods of expansion and change for meeting present and future load demands.
True
False
