Ee Preboard Answers: C. Flux
Ee Preboard Answers: C. Flux
Ee Preboard Answers: C. Flux
A. 5 B. 3.08 C. 7 D. 1
4. A 25 kVA transformer delivers a load of 12 kW at 0.6 pf lagging. What is max load kVA at 0.866
leading to be added so as not exceed transformer rating.
A. 13.2 B. 15 C. 12.8 D. 16
5. A single grounding electrode is permitted when the resistance to ground does not exceed?
A. 5 ohms B. 25 ohms C. 10 ohms D. 30 ohms
6. The overcurrent protection for 5.5 mm2 TW (2.6 mm dia.) copper shall not exceed ______ amperes.
A. 25 B. 35 C. 40 D. 30
7. Which is not true about the neutral conductor?
A. Is always the "white" conductor
B. 70% applied for a household clothes dryer for a branch circuits
C. Never apply ampacity correction
D. Carries the unbalanced current
8. Voltage in a generator is produced by
A. Resonance B. Pressures C. Chemical D. Cutting line of force.
9. Multiple start buttons in a motor control circuit as connected in ______.
A. series B. Parallel C. Series-parallel D. None of these
10. Which one has the highest electrical breakdown strength and longest life over all other materials
used for insulation.
14. A resistor has an indicated tolerance error of 10%. With a value of 1000 ohms, the minimum
resistance the resistor may have is _______.
A. 1,100 ohms B. 990 ohms C. 910 ohms D. 900 ohms
EE PREBOARD ANSWERS
15. To transmit power economically over considerable distances, it is necessary that the voltages be
high. High voltages are readily obtainable with ________.
A. Rectified B. AC C. DC D. Carrier
16. Electron flow produced by means of applying pressure to a material is called _____.
A. photo conduction B. Electrochemistry C. Piezoelectricty D. Thermoelectricty
17. An AC ammeter or voltmeter is calibrated to read RMS values, this means the meter is reading the
__________ value.
A. Maximum B. Peak C. Average D. Effective
18. Raceways shall be provided with ________ to compensate for thermal expansion and contraction
A. According joints B. Thermal fittings C. Expansion joint D. Control-expansion
19. An instrument that is used to measure the diameter of a wire or cable to thousandths of an inch.
A. galvanometer B. micrometer C. Hydrometer D. Ruler
20. 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.
A. 115%, 125% B. 100%, 125% C. 100%, 100% D. 125%, 140%
21. Determine the number of poles of induction motor running at 175 rpm. [No Answer]
A. 2 B. 8 C. 6 D. 12
22. Find the intensity of light source in candela if it gives illumination of 50 lux at a distance of 2m.
A. 25 B. 75 C. 50 D. 200
23. A dc generator internal resistance 0.15 ohm rated 120 volts charge two batteries A & B rated 90
volts, Battery A has internal resistance 0.32 ohm and battery B has internal 0.4 ohm respectively. Find
the charging voltage across the batteries.
A. 106.3 V B. 104.7 V C. 105.8 V D. 111.3 V
24. Two similar coils are connected in series. The total inductance for series aiding is 80H while 35H for
series opposing. Find the coupling coefficient.
A. 0.391 B. 0.875 C. 0.672 D. 0.554
25. A wire 100 cm long and carrying current of 40 A is in perpendicular whose magnetic flux density is 1.5
Wb/m2. Calculate the mechanical power which has velocity of 5 m/s.
A. 300 watts B. 100 watts C. 150 watts D. 600 watts
26. A conductor of length 1.0 meter moves at 60 angle to a uniform magnetic field of flux density 1.5
Wb/m^2 with a velocity of 10 m/s. Calculate the emf induced in it.
A. 15 volts B. 7.5 volts C. 10 volts D. 13 volts
27. Two wattmeter method is applied to 7.5 Hp, 85% efficiecny, 240 volts, 3-phase induction motor with
rated current of 18 A. Find the wattmeter readings in kW.
A. 2.16 & 4.42 B. 2.62 & 3.96 C. 3.24 & 3.34 D. 2.26 & 4.32
28. What is the IEEE standard device number 21
A. Overvoltage Relay B. Distance Relay C. Differential Relay D. Undervoltage Relay
29. A 4,400 Volt, 60 Hz transformer has a core loss of 840 Watts, of which one-third is eddy-current loss.
Determine the core loss of this transformer when it is connected to 4,600 volts, 50 Hz.
A. 977 watts B. 879 watts C. 679 watts D. 907 watts
30. The transformer oil used in transformer provides
A. Insulation B. Cooling & Lubrication C. Insulation & Cooling D. Cooling
31. A 220 kV three phase transmission line is 40 km long. The resistance per phase is 6 ohms per phase
and the inductance per phase is 20 ohms per phase. The shunt capacitance is negligible.
EE PREBOARD ANSWERS
Determine the sending end line voltage when supplying 381 MVA at 0.8 power factor lagging at 220 kV.
A. 230+j15.4 kV B. 245+j10.4 kV C. 143.82+j12.4 kV D. 240+j15.4 kV
49. What is the type of communication that only one of the two party can transmit at a time.
A. Full duplex B. Bicomm C. Half duplex D. Simplex
50. The current in RLC circuit at resonance
A. Maximum B. infinity C. minimum D. zero
51. Caliraya Lake pumped storage power plant is used during
A. Peak hours B. off peak hours C. Intermittent load D. Base load
52. Two capacitor bank are connected in parallel, each rated 10 Kvar, 400V at 60 Hz. What is the net
capacitance of the each bank?
A. 198uF B. 166uF C. 153uF D. 181uF
53. Earthing is the term used in North America and Europe. What's the term used in PEC?
A. Bonding B. Grounding C. Bond D. Ground
54. Which is not the qualification of being a Professional Electrical Engineer?
A. Filipino Citizen B. 21 years of age
C. Good moral Character D. More than 4 years of qualified experience.
55. The equation of flux density of Alternator is given by B(t) = Bm sin 377t. What is the speed of
Alternator?
A. 1800 rpm B. 1720 rpm C. 1100 rpm D. 2000 rpm
56. Which power plant has a limited storage of energy.
A. Solar B. Hydro electric C. Wind D. Pumped storage
57. A 3 C charge and a 5 C charge are 10 m apart. A 7 C is placed in a line connecting the two charges, x
meter away from the 3 C charge. If the 7 C charge is in equilibrium, find the value of x.
A. 3.9m B. 5.0m C. 4.4m D. 5.7m
58. Which of the following insulators are selected for high voltage applications?
A. Pin type B. Disc type C. Suspension type D. Strain Type
59. What transformer test determines copper loss?
A. Open circuit Test B. Short circuit Test
C. Resistance Test D. Megger Test
60. Which is true about magnetic flux
A. have sources only B. have sink only
C. have source and sinks D. do not have source and sinks
61. What is the color of conductor insulation where the conductor is intended for grounding
A. Green B. Yellow C. Red D. Blue
62. Two lamps A and B of 252 and 40 candela respectively are situated 20 m apart. A photometer is
placed at the center of the line adjoining the two lamp, calculate its reading. [What is the height?]
A. 0.66 Lux B. 0.66 Lux C. 6.6 Lux D. 66 Lux
63. What is the reason why thermal power plant decreases capacity during summer?
A. decrease water level at the lake B. temperature rise of the lake
C. taking a bath or swimming on lake D. there is no rain
64. An industrial plant supplied from 2.5 MVA, 34,500/480 volts, three phase transformer connected wye
primary-wye secondary. What must be the CT ratio to be used for its secondary power
measurement?
A. 500:5 B. 3000:5 C. 2000:5 D. 5000:5
65. Two solid changes of 1C and -8C respectively. The permittivity is 8.85x10 12 c^2/N-m2 and the distance
between the sphere center is 0.3m. Determine the force on the spheres and direction.
A. 1x10^13N attraction B. 8x10^11N attraction C. 8x10^11N Repulsion D. 0 N
EE PREBOARD ANSWERS
96. The square root of the ratio of line impedance and shunt admittance is called.
A. Surge impedance of the line B. Regulation of the line
C. Conductance of the line D. None of the above
97. In a three phase balanced delta connected load with one line open, line A has 20 A. Assume line A is
the reference and the line c is open. What should be the zero sequence of line a?
A. 0 B. 10-j5.77 A C. 30+j17.32 A D. 10+j5.77 A
98. Two load are connected in parallel. First load takes 200 kVA at 80% lagging power factor and the
second load a pure capacitive load. What is the kVAR of capacitive load if the total load is 160 kW,
unit power factor?
A. 160 B. 120 C. 100 D. 90
99. What is variable capacitor
A. Varactor B. Resistor C. Inductor D. Thyristor
100. In Philippine Grid Code, which alert issued by system operator when the contingency reserve is
zero, a generation deficiency exists, or there is critical loading or imminent overloading of
transmission lines and equipment.
A. Blue Alert B. Yellow Alert C. Red Alert D. Security Alert