問題一覧
1
A good example of kinetic energy is provided by ___________.
a tornado
2
Current has units of __________.
coulomb/second
3
Which of the following instrument is suited for high frequency?
Thermocouple
4
The starting/ in rush current of the transformer is generally __________ times of its full load current.
10
5
Fleming's left-hand rule is used for ____, while Fleming's right-hand rule is used for _____.
electric motors, electric generators
6
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
7
What is the function of protective relays in the protection scheme?
sensing device
8
Who is not a current member of the Board of Electrical Engineering?
Renato Cayetano
9
The condition in the Ohm's law is that
the temperature should remain constant
10
Nuclear reactor generally employs
fission
11
Ampere-hour of a battery depends on ____ of the plates.
Area
12
Generators that receives its field excitation current from internal source?
self-excited excitation
13
In RA 7920, What does CPE stands for?
Continuing Professional Education
14
In transformers the purpose of breather is to
extracts the moisture of the air
15
Which of the following protective device operates on the principle of Kirchoff's Current Law?
Differential Protective Relay
16
What is the minimum vertical clearance of service conductor over residential and commercial driveways?
3700 mm
17
The advantages of star connection for the same phase voltage is that it gives
extra step up voltage
18
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
19
The resistance of a rod does NOT depend on _________.
the shape of its cross-sectional area
20
Which chemical is commonly used in a breather of electrical systems?
Silica gel
21
Which of the following transformer's winding connection is MOST suitable for an unbalanced load?
Four-wye
22
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
23
In Philippine Distribution code, large customer consumes not less than ____ MW
1.0
24
Which is not the basic Rule of PEC 2009?
Construction Rule
25
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
26
Kirchoff's current law is applicable to only
junctions in a network
27
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
28
The Tesla is a unit of ____________.
magnetic flux density
29
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
30
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
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
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
33
A common utility's tariff practice to penalize industrial consumers whose power factor falls below ______ and give incentive for power factor above ______.
85% , 85%
34
Which of the following define the meaning of load factor?
The ratio of average load to maximum load.
35
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
36
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
37
Positive charge is distributed uniformly throughout a non-conducting sphere. The highest electric potential occurs _________.
at the center
38
Interpoles are connected ____ with the armature and compensating windings are connected in _______ with the armature
series, series
39
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
40
Which type of resistor used to protect electronic circuits from excessive flow of current?
Varistor
41
What can usually be assumed as the driving or source voltage for fault and voltage calculations in per unit method?
1 p.u.
42
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
43
Which of the following AC device is used to measure the angle between the voltage and its current?
phase angle meter
44
A system or circuit conductor that is intentionally grounded.
Grounded conductor
45
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
46
In EPIRA LAW, what is the maximum long duration voltage variation?
10%
47
A Conservator consist of
an air-tight metal drum fixed at the top of the tank
48
Which of the following is most suitable for running in parallel operations?
shunt generator
49
If the magnetic flux through a certain region is changing with time __________.
an emf exist around the boundary
50
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
51
What is the function of the surge tank in the hydro power plant?
Relieve water hammer pressures in the penstock pipe
52
In Philippine Distribution Code, the utility requires the consumer to operate at a power factor not less than _______ percent.
85%
53
Overhead system can be designed for operation up to ___.
400 kV
54
How many percent is the maximum continuous load for branch circuit conductor?
80%
55
The main function of communication satellite is as a(n)
Repeater
56
Which of the following is normally a controlled grounding path for current flow?
high impedance circuit
57
Based load plants are designed to supply power at _________.
high capital cost and low operating cost
58
Which of the following is NOT a reason why single-phase induction motor run?
Hysteresis
59
What is the maximum rating of overcurrent protection device for 20A Air conditioning unit?
35A
60
Two wattmeter can be used to measure 3-phase power for a
balanced and unbalanced load
61
What is the equivalent of 1MWHR?
1,000 kWHR
62
Which of the following will the effect of the electric shock in the human body depend on?
current flowing in the body
63
When the sole purpose of ac is to produce heat, the selection is based on ____.
RMS value
64
What is the minimum height of receptacle for outdoor outlets?
2000mm
65
For an unbalance load, which connection is suitable
4 - wire star connection
66
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
67
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
68
When you place a measuring meter in parallel to the load, the instrument is a/an______.
Voltmeter
69
In PEC, the allowable voltage drop for lightning circuit is ____ and ____ in feeder, respectively.
3%, 5%
70
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
71
Which of these is NOT a simplex type of electronic communication?
Telephone
72
The amplitude modulation generated at a very low voltage or power amplifier is _____________ modulation.
low-level
73
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
74
What is a crucial requirement for the transformer oil?
Moisture-free
75
The coulomb force F, acts on two charges a distance, r, apart. What is F proportional to?
1/r^2
76
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
77
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
78
What is the minimum size of grounding rod?
16mm
79
The grounded conductor is a/an ___________ grounded conductor.
intentionally
80
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
81
In the left hand rule, point finger always represent
Magnetic field
82
When the amplitude of the oscillator in a series RLC circuit is doubled, the __________.
current amplitude is doubled
83
Board of Electrical Engineering is composed of one Chairman and how many members?
2
84
Which of the following is NOT a property of magnetic field lines?
The lines cross themselves only at right angle.
85
What is the main reason that alternating current replaced direct current for general used?
AC voltages conveniently transformed.
86
In an RLC circuits, the impedance at resonance is
minimum
87
The readings of the wattmeter will be the same in two-wattmeter method when _________.
power factor is unity
88
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
89
Which of the following transformer has only one winding?
autotransformer
90
In paralleling A & B transformers, increasing the per unit impedance of transformer A will lead to_____________.
increase load on transformer
91
What is/are the connection of capacitor to improve the power factor of an inductive circuit? I. Parallel II. Series
I only
92
Tap changer of transformer is located where?
HV side
93
When one electrical circuit controls another electrical circuit through a relay, the circuit is _____ circuit
Relay Control Circuit
94
Is the ground can be intentional or accidental? I. True II. False
I only
95
What is the electrical analog of a spring constant "k"?
1/C
96
The nameplate of an induction motor lists 1460 rpm as the full load speed. For what frequency was the motor designed?
50 Hz
97
The main power sources for a satellite are
solar cell
98
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.
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
In the oscillating LC circuit, then total stored energy is U. The maximum energy stored in the capacitor during one cycle is ____________.
U