問題一覧
1
Kirchoff's current law is applicable to only
junctions in a network
2
The condition in the Ohm's law is that
the temperature should remain constant
3
What is a crucial requirement for the transformer oil?
Moisture-free
4
Overhead system can be designed for operation up to ___.
400 kV
5
Which type of resistor used to protect electronic circuits from excessive flow of current?
Varistor
6
Which chemical is commonly used in a breather of electrical systems?
Silica gel
7
GMC was created by the Energy Regulatory Commission to monitor the compliance of the users of the Grid to the PGC. What does the GMC stands for?
Grid Management Committee
8
What is the maximum rating of overcurrent protection device for 20A Air conditioning unit?
35A
9
Fleming's left-hand rule is used for ____, while Fleming's right-hand rule is used for _____.
electric motors, electric generators
10
How many percent is the maximum continuous load for branch circuit conductor?
80%
11
The power circuit for bathroom can also supply: i. one luminaire and one receptacle for the same bathroom ii. Two receptacle for the same bathroom and two or more for another bathroom iii. Two receptacle and two luminaire for the same bathroom and two more receptacle and luminaire for another bathroom.
I only
12
When you place a measuring meter in parallel to the load, the instrument is a/an______.
Voltmeter
13
In the left hand rule, point finger always represent
Magnetic field
14
Ampere-hour of a battery depends on ____ of the plates.
Area
15
When the sole purpose of ac is to produce heat, the selection is based on ____.
RMS value
16
In EPIRA LAW, what is the maximum long duration voltage variation?
10%
17
In PEC, the allowable voltage drop for lightning circuit is ____ and ____ in feeder, respectively.
3%, 5%
18
If an electrical network having one or more than one voltage source, is transformed into equivalent electrical network with a single voltage source (which is short circuit current of previous circuit) with parallel internal resistance of the network with all current source replaced by their internal resistance. The above illustration is called
Norton's theorem
19
Which is not the basic Rule of PEC 2009?
Construction Rule
20
Regarding Thevenin's equivalent, which of the following is not correct?
The Thevenin's equivalent resistance is calculated when all voltage sources are open circuited
21
What is the minimum vertical clearance of service conductor over residential and commercial driveways?
3700 mm
22
What is the minimum height of receptacle for outdoor outlets?
2000mm
23
In paralleling A & B transformers, increasing the per unit impedance of transformer A will lead to_____________.
increase load on transformer
24
It is the total number of sustained customer power interruption within a given period divided by the total number of customers served within the same period.
SAIFI
25
In RA 7920, What does CPE stands for?
Continuing Professional Education
26
In Philippine Distribution code, large customer consumes not less than ____ MW
1.0
27
Who is not a current member of the Board of Electrical Engineering?
Renato Cayetano
28
Nuclear reactor generally employs
fission
29
Board of Electrical Engineering is composed of one Chairman and how many members?
2
30
What is the minimum size of grounding rod?
16mm
31
A location not normally subject to dampness or temporarily subject to dampness or wetness in the case of building under construction.
Dry location
32
A system or circuit conductor that is intentionally grounded.
Grounded conductor
33
A device intended for the protection of personnel that function to energize a circuit or portion thereof within the established period of time when current to the ground exceeds the values established for class A device.
GFCI
34
What effect on current flow does reversing the direction of movement conductor in the magnetic field of a generator have
it reverse the direction of current flow
35
Interpoles are connected ____ with the armature and compensating windings are connected in _______ with the armature
series, series
36
A Conservator consist of
an air-tight metal drum fixed at the top of the tank
37
In transformers the purpose of breather is to
extracts the moisture of the air
38
The advantages of star connection for the same phase voltage is that it gives
extra step up voltage
39
For an unbalance load, which connection is suitable
4 - wire star connection
40
The main power sources for a satellite are
solar cell
41
The conductor used to connect the grounding electrode(s) to the equipment grounding conductor, or to both, at the service, at each building or structure where supplied by feeder(s) or branch circuit(s), or at the source of separately derived system.
Grounding Electrode Conductor
42
When one electrical circuit controls another electrical circuit through a relay, the circuit is _____ circuit
Relay Control Circuit
43
Two wattmeter can be used to measure 3-phase power for a
balanced and unbalanced load
44
The main function of communication satellite is as a(n)
Repeater
45
Tap changer of transformer is located where?
HV side
46
In PEC it is defined as installations underground or in concrete slabs or masonry in direct contact with the earth, and locations subject to saturation with water or other liquids such as vehicle washing areas, and location exposed to weather and unprotected.
Wet location
47
In Philippine Distribution Code, the utility requires the consumer to operate at a power factor not less than _______ percent.
85%
48
Location of Disconnecting means for air conditioner I. Within insight from II. Can be mounted above the unit III. Can be mounted inside the unit
I only
49
Based load plants are designed to supply power at _________.
high capital cost and low operating cost
50
The amplitude modulation generated at a very low voltage or power amplifier is _____________ modulation.
low-level
51
Which of the following type of fault that used only the equivalent positive impedance of the circuit in the short-circuit calculation?
Three-phase fault
52
Which of the following define the meaning of load factor?
The ratio of average load to maximum load.
53
If the magnetic flux through a certain region is changing with time __________.
an emf exist around the boundary
54
In a capacitor start motor, the capacitor is replaced by an inductor having the same reactance as in capacitor. Then the motor will ___________.
not start
55
The current is zero in a conductor when NO potential difference is applied because___________.
for every electron with a given velocity there is another with a velocity of equal magnitude and opposite direction
56
Which of the following transformer has only one winding?
autotransformer
57
Which of the following AC device is used to measure the angle between the voltage and its current?
phase angle meter
58
A resistor with resistance R1 and a resistor with resistance R2 are connected in parallel to an ideal battery with emf V. What is the rate of thermal energy generation in the resistor with resistance R1?
V2/R1
59
The grounded conductor is a/an ___________ grounded conductor.
intentionally
60
The resistance of a rod does NOT depend on _________.
the shape of its cross-sectional area
61
A common utility's tariff practice to penalize industrial consumers whose power factor falls below ______ and give incentive for power factor above ______.
85% , 85%
62
One primary and one secondary terminal of the two-winding transformer are connected to an ohm-meter instrument. What will be the reading on this instrument?
Infinity
63
When the amplitude of the oscillator in a series RLC circuit is doubled, the __________.
current amplitude is doubled
64
Which of the following protective device operates on the principle of Kirchoff's Current Law?
Differential Protective Relay
65
Which of the following will the effect of the electric shock in the human body depend on?
current flowing in the body
66
The coulomb force F, acts on two charges a distance, r, apart. What is F proportional to?
1/r^2
67
An LC series circuit with an inductance L and a capacitor C has an oscillation frequency of f. Two inductors, each with inductance L, and two capacitors, each with capacitance C, are all wired in series and the circuit is completed. The oscillation frequency is __________.
f
68
Which of these is NOT a simplex type of electronic communication?
Telephone
69
A good example of kinetic energy is provided by ___________.
a tornado
70
Current has units of __________.
coulomb/second
71
The readings of the wattmeter will be the same in two-wattmeter method when _________.
power factor is unity
72
Modern locomotives are powered by DC motors driven by DC generators. Those are, in turn, driven by diesel engines. Which of the following is the reason for using such a configuration instead of AC general-motor sets?
The DC configuration provides high torque and good incremental power at low speeds, and performs equally well at high speeds
73
What is the main reason that alternating current replaced direct current for general used?
AC voltages conveniently transformed.
74
What can usually be assumed as the driving or source voltage for fault and voltage calculations in per unit method?
1 p.u.
75
Which of the following is NOT a reason why single-phase induction motor run?
Hysteresis
76
Which of the following is normally a controlled grounding path for current flow?
high impedance circuit
77
The resistance of resistor 1 is twice of resistor 2. The two are connected in SERIES and a potential difference is maintained across the combination. What is the rate of thermal energy generation in resistor 1?
Twice that in resistor 2
78
What is the function of the surge tank in the hydro power plant?
Relieve water hammer pressures in the penstock pipe
79
Which of the following is NOT a property of magnetic field lines?
The lines cross themselves only at right angle.
80
Is the ground can be intentional or accidental? I. True II. False
I only
81
In the oscillating LC circuit, then total stored energy is U. The maximum energy stored in the capacitor during one cycle is ____________.
U
82
What is the function of protective relays in the protection scheme?
sensing device
83
What is the electrical analog of a spring constant "k"?
1/C
84
The starting/ in rush current of the transformer is generally __________ times of its full load current.
10
85
Which of the following transformer's winding connection is MOST suitable for an unbalanced load?
Four-wye
86
Which of the following instrument is suited for high frequency?
Thermocouple
87
Positive charge is distributed uniformly throughout a non-conducting sphere. The highest electric potential occurs _________.
at the center
88
Two wires of the same material have the same length but different diameters. They are connected in SERIES to a battery. Which of the following quantity is the same for the two wires?
Current
89
The Tesla is a unit of ____________.
magnetic flux density
90
Which of the following limits the number of coils that may be placed on the armature of a DC motor or generator?
coil to coil arcing due to the breakdown of insulation
91
The magnetic torque exerted on a flat current-carrying loop of wire by a uniform magnetic field B is ______________________________.
maximum when the plane of the loop is parallel to B.
92
The government agency created under Presidential Degree 269, whose additional mandates includes preparing electrical cooperatives in operating and competing under a deregulated electricity market.
National Electrification Administration
93
The growth rate of the energy consumption in our country is 6.9%. In how many years will the energy consumption be quadrupled?
20 years
94
The nameplate of an induction motor lists 1460 rpm as the full load speed. For what frequency was the motor designed?
50 Hz
95
What is/are the connection of capacitor to improve the power factor of an inductive circuit? I. Parallel II. Series
I only
96
In an RLC circuits, the impedance at resonance is
minimum
97
What is the equivalent of 1MWHR?
1,000 kWHR
98
Generators that receives its field excitation current from internal source?
self-excited excitation
99
The shunt field of a compound generator is connected across both the series field and the armature. This connection is known as
long shunt
100
Which of the following is most suitable for running in parallel operations?
shunt generator