Evaluation Exam 11 Flashcards by Pauline Peralta

A type of electronics communication in which only one party transmits at a time
A. Full duplex
B. Half duplex
C. Bicom
D. Simplex

Half duplex

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Power plant having the maximum efficiency is
A. Thermal
B. Hydro
C. Diesel
D. Nuclear

Nuclear

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Which of the following shall NOT be excluded in the calculation of reliability standard indices of the distributor asset by the Philippine Distribution Code?
A. Outages that occur in the transmission line.
B. Planned outages where the customers have been notified at least three (3) days prior to the loss of power.
C. Outages that occur on the secondary lines of the distribution system
D. Outages that occur on the primary lines of the distribution system

Outages that occur on the primary lines of the distribution system

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Advantages of constant voltage transmission are:
A. same voltage is maintained at all loads
B. all of the above
C. increased power transmission over long distance
D. improved power factors at heavy loads

all of the above

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An ACSR conductor has (n-1) layers around its single center strand, the total number of strands will be
A. 3n^2 + 3n - 1
B. 3n^2 + 3n + 1
C. 3n^2 - 3n + 1
D. 3n^2 - 3n - 1

3n^2 - 3n + 1

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What contains in each cell site of cellular telephone system?
A. direct-link to branch
B. repeater
C. touch tone processor
D. control computer

repeater

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Corona loss is more in
A. transposed conductor
B. stranded conductor
C. ACSR
D. unstranded conductor

unstranded conductor

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________ is a process by which atoms are split apart to release energy.
A. Nuclear Spitting
B. Carburizing
C. Fission
D. Fusion

Fission

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Which of the following cannot have a single unit of 100 MW?
A. Diesel power plant
B. Steam power plant
C. Nuclear power plant
D. Hydro power plant

Diesel power plant

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What is the maximum output power of a cellular transmitter?
A. 6 watts
B. 60 watts
C. 30 watts
D. 3 watts

3 watts

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For better illumination, you would use ___________.
A. evenly spaced lights, higher ceilings
B. cluster lights
C. even spacing, numerous lights
D. random spacing of lights

even spacing, numerous lights

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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 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. Import-Export metering
D. Market metering

Net metering

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Equalizer bus is necessary for the parallel operation of the:
A. Over compounded generator only
B. series and over compound generators
C. series and under compound generators
D. series generator only

series and over compound generators

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A conductor has four identical strands arranged in diamond configuration. Find the GMR of the conductor in terms of the radius r of each strand.
A. 1.3052r
B. 1.6921r
C. 1.3008r
D. 1.7037r

1.6921r

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The power factor of receiving end of transmission line is
A. Equal to power factor of sending end
B. Less than the power factor of sending end
C. Not related to power factor of sending end
D. Greater than the power factor of sending end

Less than the power factor of sending end

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A thermal power plant has an efficiency of about
A. 30%
B. 40%
C. 20%
D. 60%

30%

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In a transmission line of negligible resistance, the surge impedance will be
A. square root of L/C
B. square root of 1/LC
C. square root of C/L
D. square root of LC

square root of L/C

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Nuclear reactors generally employ
A. fusion
B. none of these
C. fission
D. both fusion and fission

fission

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Megger is an instrument used to measure
A. inductance
B. Q of a coil
C. insulation resistance
D. very low resistance

insulation resistance

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What is the maximum full-load current for a window air conditioner connected on a 20-ampere branch circuit that supplies other loads?
A. 10
B. 15
C. 12
D. 16

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A two terminal pair of network of a transmission line can be represented by a
I. pi network
II. T network

A. II only
B. Either I or II
C. I only
D. Both I and II

Both I and II

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What is the purpose of reactor in short circuit?
A. To open the line in short circuit
B. To increase the current in short circuit
C. To lessen the current in short circuit
D. To decrease the circuit resistance

To lessen the current in short circuit

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Peak load plants are designed to supply power at
A. low capital cost and low operating cost
B. low capital cost and high operating cost
C. high capital cost and high operating cost
D. high capital cost and low operating cost

low capital cost and high operating cost

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A string efficiency of 100% means that
A. the potential across each disc is zero
B. potential across the large disc is very large
C. potential across each disc is the same
D. one of the insulator discs is shorted

potential across each disc is the same

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The value of inductance per conductor in three phase line is ________ times the loop inductance for single phase lines. A. 1/2 B. 1 C. 2 D. 1/3

1/2

Television transmission is an example of which of the following? A. Half Duplex Communication B. Full Duplex Communication C. None of the above D. Simplex Communication

Simplex Communication

A cellular phone operates on A. Half duplex B. Full duplex C. Echoplex D. Lincomplex

Full duplex

Wooden transmission poles are protected from termites using A. synthetic oil B. creosite oil C. mineral oil D. insulation oil

creosite oil

Guy wire is used in the construction of distribution lines for what purpose? A. support the conductor B. protection against surges C. providing emergency grounding D. supporting the pole

supporting the pole

The steady state stability limit for a two-machine system depends on A. power factor of the system B. per unit power input of the system C. power input D. per unit reactance of the power system

per unit reactance of the power system

Which power plant will require the highest inital cost? A. Diesel powe plant B. Steam power plant C. Nuclear power plant D. Gas power plant

Nuclear power plant

In the design of electrical power systems, the IEEE device numbers identify features of a protective device such as relay or circuit breaker. Which of the following is the device number for the ac circuit breaker?

For a detection of the occurrence of the severe synchronizing power surges A. impedance relays are best suited B. reactance relays are best suited C. MHO relays are best suited D. split-phase relays are best suited

MHO relays are best suited

RA 7832 concerns on A. pilferage of electricity and electrical materials B. pilferage of electrical energy C. pilferage of electricity, theft of transmission materials and capping of system loss D. pilferage of electricity, theft of transmission materials and rationalizing of system loss

pilferage of electricity, theft of transmission materials and rationalizing of system loss

Radio communications between points using a single share frequency. A. half duplex B. full/full duplex C. full duplex D. simplex

half duplex

Indicate which one of the following is not an advantage of FM over AM. A. lower bandwidth is required. B. The transmitted power is more useful C. Less modulating power is required. D. Better noise immunity is provided

Lower bandwidth is required.

Which of the following is NOT part of unbundling rate in your Meralco electric bill? A. Distribution B. Transmission C. Generation D. Supplier

Supplier

Which of the following define the meaning of load factor? A. The ratio of average load to installed capacity B. The ratio of maximum load to average load. C. The ratio of average load to maximum load. D. The ratio of connected load to maximum load

The ratio of average load to maximum load

If the capacitance of the transmission line is increased, the transmitted power will A. decrease B. remain same C. tend to zero at the receiving end D. increase

increase

Underground neutral transmission system is not recommended because of system A. insulation being over stressed due to over voltages B. being inadequately protected against ground fault C. insulation overstress may lead to failure and subsequent phase to phase faults D. all of the above

all of the above

The primary disadvantage of AM over FM is A. Noise susceptibility B. Lower complexity and cost C. Excessive use of spectrum space D. Greater efficiency

Noise susceptibility

If the effect of earth is taken into account, then the capacitance of line to ground A. remains unchanged B. increases C. becomes infinite D. decreases

increases

An ACSR conductor having seven steel strands surrounded by 25 aluminum conductor is specified as A. 50/14 B. 14/50 C. 7/25 D. 25/7

25/7

Zero-sequence current will flow in a transmission line when there is ________. A. an overvoltage in the line due to switching B. a fault across all three phases C. a line to line fault D. double line to ground fault

double line to ground fault

By increasing the transmission voltage double of its original value, the same power can be dispatch keeping the line loss A. Equal to its original value B. Double the original value C. One-fourth the original value D. Half of the original value

One-fourth the original value

Which one does not belong to the technical performance standards of Philippine Distribution Code? A. Load distribution B. reliability C. collection efficiency D. plant efficiency

collection efficiency

The amount of frequency deviation from the carrier center of frequency in an FM transmitter is proportional to the ________. A. amplitude B. shape C. frequency D. phase

amplitude

Which of the following is not included in a basic communication circuit? A. communication channel B. transmitter C. receiver D. antenna

antenna

The voltage regulation is MORE considered in the design of A. a generator B. the feeder C. a motor D. the transmission line

the feeder

AC system has the following disadvantages over DC system. A. proximity effect exists B. skin effect exists C. charging current exists D. line regulation is more

charging current exists

Which of the following insulators will be selected for high voltage applications? A. pin type B. suspension type C. strain type D. disc type

suspension type

Overhead transmission lines are protected from lightning with the use of which? I. Overhead grounding conductor II. Surge arrestors A. I only B. II only C. neither I nor II D. either I or II

either I or II

Water is used only for cooling purposes in A. diesel power station B. thermal power station C. nuclear power station D. gas-turbine power station

diesel power station

Which of the following that uses water power is a limited storage power plant? A. ocean power B. Run-of-River (ROR) C. Tidal power plant D. Pumped Storage

Pumped Storage

Series capacitors are used to compensate for A. None of these B. Improve the line voltage C. Compensate for line capacitive reactance D. Compensate for line inductive reactance

Compensate for line inductive reactance

The ratio of capacitance of line to neutral and line to line capacitance of a transmission line having two conductors is A. 1/4 B. 1/2 C. 2.0 D. 1.0

2.0

The peak load demand of an industrial area is met by A. Steam Power Plant B. Storage Batteries C. Diesel Power Plant D. Nuclear Power Plant

Diesel Power Plant

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. Three-phase C. Line to line D. Line to ground

Line to Line

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.

Which of the following is the largest percentage in your Meralco electric bill? A. Distribution B. Transmission C. Generation D. System Loss

Generation

The rise of temperature in transmission line A. decrease the stress and the length B. increase the stress and decrease the length C. decrease the stress and increase the length D. increase the stress and the length

decrease the stress and increase the length

The effect of series capacitor on a transmission line is to improve A. none of these B. A and B both C. transient stability D. steady state stability

steady state stability

Nuclear reactors generally employ A. Fission B. Fusion C. neither D. both

Fission

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. I B. Both I and II C. Either I or II D. II

The generating station with minimum running cost is A. diesel power station B. thermal power station C. nuclear power station D. hydro power station

hydro power station