Power System Flashcards
The power lost is MORE consider in the design of ___________.
A. motor
B. generator
C. the feeder
D. the transmission line
the transmission line ; the feeder is considered in VOLTAGE REGULATION
What is/are the main reason/s for using high voltage in the transmission of power in the grid system?
I. to transmit bulk power with minimum line losses
II. Increase system reliability
A. II only
B. Both I and II
C. either I or II
D. I only
I only
Increasing the voltage of the transmission system to double of its original value with the same power to be transmitted, the new power losses of the transmission system will be ________ of the original value.
A. twice
B. one half
C. the same
D. one-fourth
one-fourth
An unconventional conductor consists of three strands arranged vertically. FInd the GMR in terms of radius r of and individual strand.
A. 1.564r
B. 1.764r
C. 1.704r
D. 1.864r
1.704r
The value of inductance in three-phase line is _______ times the loop inductance for single-phase line.
A. 2
B. 1/2
C. 1/3
D. 3
1/2
In practice, the three-phase conductors of a three-phase line are seldom equilaterally spaced. The usual nonsymmetrical spacing produces unequal inductances in the three phases, leading to unequal voltage drops and imbalance in the line. To offset this imbalance, the positions of the inductors are interchanged at regular intervals in the line. This practice is known as ________.
I. Transposition
II. Interchange
A. Either I or II
B. II
C. Both I and II
D. I
I
A two terminal pair of network of a transmission line can be represented by
A. pi-network
B. T-network
C. either A or B
D. tree network
either A or B
The effective resistance of conductor is increased by
A. skin effect
B. proximity effect
C. corona effect
D. Both A and B
both A and B
AC system has the following disadvantages over DC system.
A. line regulation is more
B. skin effect exists
C. charging current exists
D. proximity effect exists
charging current exists
An ACSR conductor having seven steel strands surrounded by 25 aluminum conductor is specified as
A. 7/25
B. 25/7
C. 14/50
D. 50/14
25/7
An ACSR conductor has (n-1) layers around its single center strand, the total number of strands will be
A. 3n² + 3n + 1
B. 3n² - 3n - 1
C. 3n² + 3n - 1
D. 3n² - 3n + 1
3n² - 3n + 1
What is ACSR conductor stand for?
A. Anodized Core Steel Reinforced
B. Aluminum Cable Stranded Reinforced
C. All Conductor Surface Reinforced
D. Aluminum Cable Steel Reinforced
Aluminum Cable Steel Reinforced
Which of the following is NOT considered in analyzing a short transmission line?
A. Inductance
B. series impedance
C. shunt admittance
D. power losses
shunt admittance
In a transmission line of negligible resistance, the surge impedance will be
A. square root of LC
B. square root of L/C
C. square root of 1/LC
D. square root of C/L
square root of L/C
The hazards exist only during the period of time the ________ is there.
A. short-circuit
B. switching
C. lightning
D. fault
fault
Which of the following type of fault that used only the equivalent positive impedance of the circuit in the short-circuit calculation?
A. Line-to-line fault
B. Double-line-to-ground fault
C. Three-phase fault
D. Single-line-to-ground fault
Three-phase fault ; positive and negative is line to line fault and zero is ground
Which of the following type of fault used only the equivalent positive and negative sequence impedance of the circuit in the short-circuit calculation?
A. Double line to ground
B. Line to Line
C. Three-phase
D. Line to ground
Line to Line
Zero-sequence current will flow in a transmission line when there is __________.
A. a fault across all three phases
B. a line-to-line fault
C. an overvoltage in the line due to switching.
D. double line to ground fault
double line to ground fault
What can usually be assumed as the driving or source voltage for fault and voltage calculations in per unit method?
A. 1 p.u.
B. 10 p.u.
C. 3 p.u.
D. 5 p.u.
1 p.u.
For a transmission line terminated in its characteristic impedance, which of the following statement is incorrect:
A. It is a smooth line.
B. The energy distribution between magnetic and electric field is not equal.
C. Standing wave does not exist.
D. Efficiency of transmission of power is maximum.
The energy distribution between magnetic and electric field is not equal.
Guy wire is used in the construction of distribution lines for what purpose?
A. providing emergency grounding
B. supporting the pole
C. support the conductor
D. protection against surges
supporting the pole
The customer is only charged or credited as the case may be, for the difference between the electricity supplied by the Distribution Utility and electricity it supplies to the Distribution Utility and electricity it supplies to the Distribution Utility when the times it has excess VRE generation both of which are metered using either 2 uni-directional meters, one for import and one for export, or a single bi-directional meter. What do you call this scheme?
A. Dual metering
B. Net metering
C. Market metering
D. Import-Export metering
Net metering
Which of the following is NOT part of unbundling rate in your Meralco electric bill?
A. Distribution
B. Supplier
C. Transmission
D. Generation
Supplier
