EE objectives R2 R3
問題一覧
1
What device is used to measure the temperature of a motor winding, while the motor is in operation
Resistance temperature detector
2
Which of the following is not a primary components of a transformer
Flux
3
A fuse or an overcurrent trip unit of a circuit breaker shall be connected in _______ with each ungrounded conductor,
Series
4
A single grounding electrode is permitted when the resistance to ground does not exceed?
25 ohms
5
The overcurrent protection for 5.5 mm^2 TW(2.6 mm dia.) copper shall not exceed ___ amperes.
30
6
Which is not true about the neutral conductor?
never apply ampacity correction
7
Voltage in a generator is produced by
Cutting line of force
8
Multiple start buttons in a motor control circuit are connected in
Parallel
9
Which one has the highest electrical breakdown strength and longest life over all other materials used for insulation.
Impregnated paper
10
The connection of a ground clamp to a grounding electrode shall be
Accessible
11
An alternation is
one-half cycle
12
To transmit power economically over considerable distances, it is necessary that the voltages be high.
High voltages are readily obtainable with _____
AC
13
Electron flow produced by means of applying pressure to a material is called
Piezoelectricity
14
An AC ammeter or voltmeter is calibrated to read RMS values, this means the meter is reading the
value.
Effective
15
Raceways shall be provided with
to compensate for thermal expansion and contraction.
Expansion joint
16
An instrument that is used to measure the diameter of a wire or cable to thousandths of an inch.
micrometer
17
Where the branch circuit supplied continuous loads or any combination of continuous or non continuous load, the minimum branch circuit conductor size and overcurrent protection shall have allowable ampacity and rating shall not be less than ____ % the non continuous load plus.
___ percent of the continuous load.
100%, 125%
18
The transformer oil used in transformer provides
Insulation and cooling
19
What is the permitted lighting fixture in clothes closet?
recessed mounted
20
The resistance phasor of a series RC circuit points to the right. The capacitive reactance phasor points ____ while the diagonal of the rectangle having the two phasors as sides represents the ______
Down, impedance
21
What is the power if V and I are 90 degrees out of phase?
Zero
22
If the height of the transmission tower is decreased, the capacitance of the line will.
increase
23
Which is not a cause for overvoltage in power system?
Fault
24
The voltage regulation is negative when the load is
Capacitive
25
If the resistance in a series RC circuit is increase in magnitude of the phase angle
decreases
26
A capacitance C is charged through resistance R. The lime constant of the charging circuit is given by
RC
27
What is the minimum number of wattmeter required to measure unbalanced power of a three phase system
Two
28
The current in RLC circuit at resonance
maximum
29
Pumped storage Power Plant is used during.
Peak hours
30
Earthing is the term used in North America and Europe. What is the term used in PEC?
Grounding
31
Which is NOT the qualification of being a Professional Electrical Engineer?
21 years of age
32
Which power plant has a limited storage of energy.
Pumped storage
33
Which of the following insulators are selected for high voltage applications?
Suspension type
34
What transformer test determines copper Loss?
Short circuit test
35
Which is true about magnetic flux
do not have source & sinks
36
What is the color of conductor insulation where the conductor is intended for grounding
Green
37
As compared to Gauss Seidell, Newtons Raphson has
Less number of iteration and less time
38
Agreement between customer and Distribution Utility approved by ERC
Connection agreement
39
The effect of Series Capacitor on transmission line is used to improve
Steady state Stability
40
How many hours can a load be called a Continuous load?
3 hours
41
At a dc steady state, capacitor looks like a/an circuit and an inductor looks like a/an
circuit.
l. Short
Il. Open
III. Grounded
Il and l
42
American engineer wishes to practice Electrical Engineering in the Philippines must have
Foreign Reciprocity
43
What is the disadvantage of renewable energy?
Both A & B
44
What is the function of Zigzag transformer?
derive a neutral for grounding
45
Which of the following methods of generating electric power from the sea water is more advantageous
tidal power
46
If the height of transmission tower is increased, which of the following parameters is likely to change?
Capacitance
47
The square root of the ratio of line impedance and shunt admittance is called
Surge impedance of the line
48
What is variable capacitor.
Varactor
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
The current is zero in a conductor when NO potential difference is applied because
the electrons are not moving
52
Which of the following transformer has only one winding?
Autotransformer
53
Why is the core losses are negligible during a short circuit test on transformer?
The mutual flux is small
54
One primary and one secondary terminal of a two-winding transformer are connected to an Ohm-meter instrument. What will be thew reading of the instrument?
Infinity
55
ALC series circuit with an inductance L and capacitance C has an oscillation frequency f.
Two inductors, each with inductance L and two capacitors, each with capacitance C, are wired in series and the circuit is completed. The oscillation frequency is
f
56
What is the relationship between the line current lL and the coil current Ic in a balanced delta system?
lL=1.732 Ic
57
An initially uncharged capacitor C is connected in series with a resistor R. The combination is then connected to a battery of emf Vo. Sufficient time elapses so that the steady state is reached. Which of the following statement is NOT true?
The total thermal energy generated by R is independent of R
58
For measuring the resistance of the elements of an attenuator which of the following is the best choice?
Wheatstone oridge
59
The winding of power transformer usually develops short circuit on account of
impulse voltage
60
Which is not a renewable energy?
Nuclear
61
The sum of the currents into a junction equals the sum of the currents out of the junction is a consequence of
Conservation of Charge
62
Which of the following is are drawbacks of SF6 circuit breaker?
I. Sealing problem of gas
II. Presence of Moisture in the system is dangerous
Both I & Il
63
What is ANSI device number for AC Time overcurrent Relay?
51
64
The direction of magnetic lines
from north pole to south pole
65
Which of the following will you connect to make a galvanometer into an ammeter?
A low resistance in parallel
66
Which of the following type of motor is used in electric toys
shaded pole motor
67
For any circuit, the number of independent equations containing emfs, resistance and currents, equals the number of
branches
68
What is the instrument often used to check the degree of motor shaft alignment?
Dial indicator
69
If the context of the loop and junction rules for electrical circuit, junction is where
three or more wires are joined
70
If the potential difference across a resistor is doubled only
the current is doubled
71
In an RL circuit, the source voltage is leading the current at a given frequency f. If fis lowered slightly, the circuit impedance will
decrease
72
A refrigerator receptacle can be fed from a
I. 15 Ampere individual branch circuit
I. 20 Ampere individual branch circuit
III. 20 Ampere small appliance branch circuit
Il and lll
73
In a series circuit, the current is
constant
74
The magnetic torque exerted on a flat current carrying loop of wire by a uniform magnetic field is
maximum when the plane of the loop Is parallel to B
75
Which of the following statement is FALSE?
Window 98 is RTOS
76
The unit of magnetic dipole moment are
ampere-meter^2
77
The value of inductance in three phase line is
ampere-meter2 ampere/meter
times the loop inductance for the
single phase line.
1/2
78
Which of the following statement is CORRECT for Faraday's Law?
an induced electromotive force is proportional to the rate of change of magnetic flux
79
A cylindrical copper rod has a resistance R. It is reformed to twice its original length with NO change in volume. What is the new resistance?
4R
80
DMC was created by the Energy Regulatory Commission to monitor the compliance of the distribution utilities to the PDC. DMC stands
Distribution Management Committee
81
The lighting load for an office building expressed in terms of unit load in volt-ampere per square meter must be at least
28
82
The starting current of the transformer is generally ______ time of the rated full load current.
10
83
Positive charge is distributed uniformly throughout A non-conducting sphere. The highest electric potential occurs
at the center
84
What is the primary function of the tubes welded on the side of oil type transformer?
to improve the cooling
85
Suppose that the fundamental dimension are taken to be force(F), velocity (V) and time (T).
What are the dimension of potential energy?
FVT
86
What is the rms value of an AC current?
The steady current that produces the same rate of heating a resistor as the actual current
87
What is/are the reasons for using high voltage in the transmission of power in the grid?
I To transmit large amount of power with minimum line losses
ll To increase the system reliability
l
88
When the amplitude of the oscillator in series RL circuit is doubled the
current amplitude is doubled
89
The protection against overvoltage due to lightning is/are provided by
l. used of overhead ground wires → also chield wire
Il. Used of surge arresters
either l or ll
90
A 10 kVA, 400/200V, 2.5% impedance single phase transformer is to be operated with secondary short circuited. What should be the input voltage in this short circuit test?
10 V
91
In a purely inductive circuit, the current lags the voltage by
one fourth of the cycle
92
A car battery is rated at 80 amp-hr. An ampere-hour is a unit of
Charge
93
The boundary of protection system is determined by the location of
Current transformer
94
Simultaneous two way communication is called
Full duplex
95
Which of the following is NOT a common type of fiber optic cable?
single mode graded-index
96
Cellular telephones use which type of operation
Full duplex
97
Which statement about charge placed on a dielectric material is true?
The charge is confined to the region in which the charge was placed
98
Spinning reserve is also called
Hot standby Reserve
99
The power transmission capacity of the transmission line is
proportional to the square of the voltage
100
The power intended to be available even under emergency condition is called
firm power
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19問 • 2年前問題一覧
1
What device is used to measure the temperature of a motor winding, while the motor is in operation
Resistance temperature detector
2
Which of the following is not a primary components of a transformer
Flux
3
A fuse or an overcurrent trip unit of a circuit breaker shall be connected in _______ with each ungrounded conductor,
Series
4
A single grounding electrode is permitted when the resistance to ground does not exceed?
25 ohms
5
The overcurrent protection for 5.5 mm^2 TW(2.6 mm dia.) copper shall not exceed ___ amperes.
30
6
Which is not true about the neutral conductor?
never apply ampacity correction
7
Voltage in a generator is produced by
Cutting line of force
8
Multiple start buttons in a motor control circuit are connected in
Parallel
9
Which one has the highest electrical breakdown strength and longest life over all other materials used for insulation.
Impregnated paper
10
The connection of a ground clamp to a grounding electrode shall be
Accessible
11
An alternation is
one-half cycle
12
To transmit power economically over considerable distances, it is necessary that the voltages be high.
High voltages are readily obtainable with _____
AC
13
Electron flow produced by means of applying pressure to a material is called
Piezoelectricity
14
An AC ammeter or voltmeter is calibrated to read RMS values, this means the meter is reading the
value.
Effective
15
Raceways shall be provided with
to compensate for thermal expansion and contraction.
Expansion joint
16
An instrument that is used to measure the diameter of a wire or cable to thousandths of an inch.
micrometer
17
Where the branch circuit supplied continuous loads or any combination of continuous or non continuous load, the minimum branch circuit conductor size and overcurrent protection shall have allowable ampacity and rating shall not be less than ____ % the non continuous load plus.
___ percent of the continuous load.
100%, 125%
18
The transformer oil used in transformer provides
Insulation and cooling
19
What is the permitted lighting fixture in clothes closet?
recessed mounted
20
The resistance phasor of a series RC circuit points to the right. The capacitive reactance phasor points ____ while the diagonal of the rectangle having the two phasors as sides represents the ______
Down, impedance
21
What is the power if V and I are 90 degrees out of phase?
Zero
22
If the height of the transmission tower is decreased, the capacitance of the line will.
increase
23
Which is not a cause for overvoltage in power system?
Fault
24
The voltage regulation is negative when the load is
Capacitive
25
If the resistance in a series RC circuit is increase in magnitude of the phase angle
decreases
26
A capacitance C is charged through resistance R. The lime constant of the charging circuit is given by
RC
27
What is the minimum number of wattmeter required to measure unbalanced power of a three phase system
Two
28
The current in RLC circuit at resonance
maximum
29
Pumped storage Power Plant is used during.
Peak hours
30
Earthing is the term used in North America and Europe. What is the term used in PEC?
Grounding
31
Which is NOT the qualification of being a Professional Electrical Engineer?
21 years of age
32
Which power plant has a limited storage of energy.
Pumped storage
33
Which of the following insulators are selected for high voltage applications?
Suspension type
34
What transformer test determines copper Loss?
Short circuit test
35
Which is true about magnetic flux
do not have source & sinks
36
What is the color of conductor insulation where the conductor is intended for grounding
Green
37
As compared to Gauss Seidell, Newtons Raphson has
Less number of iteration and less time
38
Agreement between customer and Distribution Utility approved by ERC
Connection agreement
39
The effect of Series Capacitor on transmission line is used to improve
Steady state Stability
40
How many hours can a load be called a Continuous load?
3 hours
41
At a dc steady state, capacitor looks like a/an circuit and an inductor looks like a/an
circuit.
l. Short
Il. Open
III. Grounded
Il and l
42
American engineer wishes to practice Electrical Engineering in the Philippines must have
Foreign Reciprocity
43
What is the disadvantage of renewable energy?
Both A & B
44
What is the function of Zigzag transformer?
derive a neutral for grounding
45
Which of the following methods of generating electric power from the sea water is more advantageous
tidal power
46
If the height of transmission tower is increased, which of the following parameters is likely to change?
Capacitance
47
The square root of the ratio of line impedance and shunt admittance is called
Surge impedance of the line
48
What is variable capacitor.
Varactor
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
The current is zero in a conductor when NO potential difference is applied because
the electrons are not moving
52
Which of the following transformer has only one winding?
Autotransformer
53
Why is the core losses are negligible during a short circuit test on transformer?
The mutual flux is small
54
One primary and one secondary terminal of a two-winding transformer are connected to an Ohm-meter instrument. What will be thew reading of the instrument?
Infinity
55
ALC series circuit with an inductance L and capacitance C has an oscillation frequency f.
Two inductors, each with inductance L and two capacitors, each with capacitance C, are wired in series and the circuit is completed. The oscillation frequency is
f
56
What is the relationship between the line current lL and the coil current Ic in a balanced delta system?
lL=1.732 Ic
57
An initially uncharged capacitor C is connected in series with a resistor R. The combination is then connected to a battery of emf Vo. Sufficient time elapses so that the steady state is reached. Which of the following statement is NOT true?
The total thermal energy generated by R is independent of R
58
For measuring the resistance of the elements of an attenuator which of the following is the best choice?
Wheatstone oridge
59
The winding of power transformer usually develops short circuit on account of
impulse voltage
60
Which is not a renewable energy?
Nuclear
61
The sum of the currents into a junction equals the sum of the currents out of the junction is a consequence of
Conservation of Charge
62
Which of the following is are drawbacks of SF6 circuit breaker?
I. Sealing problem of gas
II. Presence of Moisture in the system is dangerous
Both I & Il
63
What is ANSI device number for AC Time overcurrent Relay?
51
64
The direction of magnetic lines
from north pole to south pole
65
Which of the following will you connect to make a galvanometer into an ammeter?
A low resistance in parallel
66
Which of the following type of motor is used in electric toys
shaded pole motor
67
For any circuit, the number of independent equations containing emfs, resistance and currents, equals the number of
branches
68
What is the instrument often used to check the degree of motor shaft alignment?
Dial indicator
69
If the context of the loop and junction rules for electrical circuit, junction is where
three or more wires are joined
70
If the potential difference across a resistor is doubled only
the current is doubled
71
In an RL circuit, the source voltage is leading the current at a given frequency f. If fis lowered slightly, the circuit impedance will
decrease
72
A refrigerator receptacle can be fed from a
I. 15 Ampere individual branch circuit
I. 20 Ampere individual branch circuit
III. 20 Ampere small appliance branch circuit
Il and lll
73
In a series circuit, the current is
constant
74
The magnetic torque exerted on a flat current carrying loop of wire by a uniform magnetic field is
maximum when the plane of the loop Is parallel to B
75
Which of the following statement is FALSE?
Window 98 is RTOS
76
The unit of magnetic dipole moment are
ampere-meter^2
77
The value of inductance in three phase line is
ampere-meter2 ampere/meter
times the loop inductance for the
single phase line.
1/2
78
Which of the following statement is CORRECT for Faraday's Law?
an induced electromotive force is proportional to the rate of change of magnetic flux
79
A cylindrical copper rod has a resistance R. It is reformed to twice its original length with NO change in volume. What is the new resistance?
4R
80
DMC was created by the Energy Regulatory Commission to monitor the compliance of the distribution utilities to the PDC. DMC stands
Distribution Management Committee
81
The lighting load for an office building expressed in terms of unit load in volt-ampere per square meter must be at least
28
82
The starting current of the transformer is generally ______ time of the rated full load current.
10
83
Positive charge is distributed uniformly throughout A non-conducting sphere. The highest electric potential occurs
at the center
84
What is the primary function of the tubes welded on the side of oil type transformer?
to improve the cooling
85
Suppose that the fundamental dimension are taken to be force(F), velocity (V) and time (T).
What are the dimension of potential energy?
FVT
86
What is the rms value of an AC current?
The steady current that produces the same rate of heating a resistor as the actual current
87
What is/are the reasons for using high voltage in the transmission of power in the grid?
I To transmit large amount of power with minimum line losses
ll To increase the system reliability
l
88
When the amplitude of the oscillator in series RL circuit is doubled the
current amplitude is doubled
89
The protection against overvoltage due to lightning is/are provided by
l. used of overhead ground wires → also chield wire
Il. Used of surge arresters
either l or ll
90
A 10 kVA, 400/200V, 2.5% impedance single phase transformer is to be operated with secondary short circuited. What should be the input voltage in this short circuit test?
10 V
91
In a purely inductive circuit, the current lags the voltage by
one fourth of the cycle
92
A car battery is rated at 80 amp-hr. An ampere-hour is a unit of
Charge
93
The boundary of protection system is determined by the location of
Current transformer
94
Simultaneous two way communication is called
Full duplex
95
Which of the following is NOT a common type of fiber optic cable?
single mode graded-index
96
Cellular telephones use which type of operation
Full duplex
97
Which statement about charge placed on a dielectric material is true?
The charge is confined to the region in which the charge was placed
98
Spinning reserve is also called
Hot standby Reserve
99
The power transmission capacity of the transmission line is
proportional to the square of the voltage
100
The power intended to be available even under emergency condition is called
firm power