REE 2019 1. Based load power plants are designed to supply power at . a. low capital cost and low operating cost b. high capital cost and low operating cost c. low capital cost and high operating cost d. high capital cost and high operating cost 2. A coil of wire having a value of 10 + j16 Ω is connected in series with a capacitive reactance Xc, and this series combination is then connected in parallel with a resistor R. If the equivalent impedance of the circuit is 8 + j0 Ω, what is the value of Xc in Ω? a. 14 c. 10 b. 18 d. 16 3. A transponder with a bandwidth of 400MHz uses polarization diversity. If the wavelength allocated to transmit a single telephone channel is 4 kHz, how many telephone channels can be carried by the transponder? a. 300,000 c. 100,000 b. 400,000 d. 200,000 4. Resistor 1 has twice the resistance of resistor 2. They are connected in connected in parallel to a battery. Find the ratio of thermal energy generation rate in resistor 1 to that in resistor 2. a. 2:1 c. 4:1 b. 1:4 d. 1:2 5. A room air conditioner is to be attached to an individual branch circuit. If the load is 12 A, what is the minimum size of the branch circuit required? a. 15 A c. 8.7 A b. 12.8 A d. 9.6 A 6. The energy that is stored in a 25 microF is W(t) = 12 sin2 (377t) joule. Determine the current in A in the capacitor. a. 6 cos 377t c. 9.23 sin wt b. 6 sin 377t d. 9.23 cos wt 7. The amplitude modulation generated at very low voltage or power amplifier is modulation. a. minimum c. high-level b. collector d. low-level 8. Which of the following type of fault that used only the equivalent positive impedance of the circuit in short-circuit calculations? a. line-to-line fault c. three-phase fault b. double-line-to-ground fault d. single-line-to-ground fault 9. A washing machine is , in effect, an R-L circuit. If the machine takes 311W and 4.5 A from a 155-V source when operating normally, find its power factor a. 0.75 lagging c. 0.70 lagging b. 0.65 lagging d. 0.60 lagging 10. Which of the following defines the meaning of load factor? a. The ratio of average load to installed capacity b. The ratio of the maximum load to average load c. The ratio of average load to maximum load d. The ratio of connected load to maximum load 11. If the magnetic flux through a certain region is changing with time, a. an emf exists around the boundary b. a current must flow around the boundary c. an electric field must exist at the boundary d. a magnetic field must exist at the boundary 12. In a capacitor start motor, the capacitor is replaced by an inductor having the same reactance as the capacitor, then the motor will . a. be damaged c. start and run at its rated speed b. start but run at a slow speed d. not start 13. The current is zero in a conductor when NO potential difference is applied because . a. the electrons are not moving fast enough b. equal number of electrons and protons are moving together c. the electrons are not moving d. for every electron with a given velocity, there is another with a velocity of equal magnitude and opposite direction 14. Which of the following transformer has only one winding? a. current c. auto-transformer b. distribution d. power 15. Which of the following AC device is used to measure the angle between the voltage and its current? a. reactive meter c. demand meter b. power factor meter d. phase angle meter 16. A flux of 13.6 mWb penetrates a coil of wire 240 mm in diameter. Find the magnitude of the magnetic flux density in Tesla if the plane of the coil is perpendicular to the field. a. 0.3 c. 0.4 b. 0.8 d. 0.5 17. A single-phase inductive load draws 10MW at 60% lagging power factor. Determine the reactive power factor of a capacitor in MVAR to be connected in parallel with load to raise the power factor to 85%. a. 48 c. 56 b. 51 d. 43 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? a. V2/R2 c. V2R1/(R1+R2)2 b. V2/R1 d. V2(R1 + R2) 19. The grounded conductor is a/an grounded conductor. a. isolated c. insulated b. guarded d. intentionally 20. The resistance of a rod does NOT depend on . a. the shape of its cross-sectional area b. its length c. its material d. its temperature 21. A common utility’s tariff practice to penalize industrial consumers whose power factor falls below and give incentives for power factor above . a. 80%, 90% c. 85%, 85% b. 75%, 90% d. 75%, 85% 22. One primary and one secondary terminal of a two-winding transformer are connected to an ohm-meter instrument. What will be the reading on this instrument? a. infinity c. zero of infinity b. equal to winding resistance d. zero 23. When the amplitude of the oscillator in a series RLC circuit is doubled, the . a. current amplitude is doubled b. the voltage across the capacitor is halved c. impedance is doubled d. capacitor reactance is halved 24. Which of the following protective devices operates on the principle of Kirchhoff’s Current Law? a. instantaneous overcurrent relay c. undercurrent relay b. differential protective relay d. AC time overcurrent relay 25. Which of the following will the effect of the electric shock in the human depend on? a. voltage flowing in the body c. current flowing on the body b. line power d. resistance of the line 26. The coulomb force F, acts on two charges a distance, r, apart. What is F proportional to? a. r c. r^2 b. 1/r^2 d. 1/r^3 27. An LC series circuit with an inductance L and 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 . a. f/4 c. 2f b. f d. f/2 28. Approximately how far must an isolated positive point charge of 1 x 10^(-8) C be in order for it to produce an electric potential of 100 V? The charge is in free space with e = 8.85 x 10^(-12) C^2/N*m^2. a. 8.6 m c. 1.2 m b. 0.90 m d. 5.3 m 29. Which of these is NOT a simplex type of electronic communication? a. TV broadcasting c. Paging services b. Facsimile of fax d. Telephone 30. A good example of kinetic energy is provided by a. a tornado b. a wound clock spring c. an automobile storage battery d. the raised weights of grandfather’s clock 31. A 60 Hz alternator has a speed of 300 rpm. How many poles has it? a. 12 c. 24 b. 6 d. 16 32. Current has a unit of . a. coulomb c. coulomb/second b. ohm d. volt 33. A stationary conducting loop with an internal resistance of 0.5 ohm is placed in a time-varying magnetic field. When the loop is closed, a current of 5 A flows through it. What will the current be if the loop is opened to create a small gap and a 2-ohm resistor is connected across its open ends? a. 2 A c. 4 A b. 1 A d. 3 A 34. The reading of the wattmeter will be the same in the two-wattmeter method when . a. load in one phase is zero b. power factor is 0.50 c. power factor is unity d. neutral is grounded 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 generator-motor sets? a. The DC equipment is significantly less expensive b. The DC configuration provides high torque and good incremental power at low speeds and perform equally well at high speeds c. Historically, the DC engines configuration has been used. There is no reason to change this. d. By using DC equipment, the power factor problems associated with AC equipment are avoided 36. What is the main reason that alternating current replaced direct current for general use? a. AC voltages conveniently transformed b. AC generators do not need slip rings c. AC minimizes magnetic fields d. A given AC current does not heat up power lines as much as the same as DC current 37. A loop of wire carrying a current of 2 A is in the shape of a right triangle with two equal sides, each 15 cm long. A 0.70 T uniform field is parallel to the hypotenuse. What is the resultant magnetic force on the two equal sides? a. zero c. 0.21 N b. 0.41 N d. 0.31 N 38. What can usually be assumed as the driving or source voltage for fault and voltage calculations in per unit method? a. 1 p.u. c. 3 p.u. b. 10 p.u. d. 5 p.u. 39. Which of the following is NOT a reason why single-phase induction motor run? a. two windings displaced form each other b. hysteresis c. one of the currents is made out of phase between the lines d. shaded poles 40. Which of the following is normally a controlled grounding path for current flow? a. high impedance circuit c. parallel circuit b. capacitive circuit d. series circuit 41. Two million cu. m of water is stored in a reservoir feeding water turbine. The center of the mass is 50 m above the turbine and losses are negligible. The density of water is 993kg/cu. m. How much energy in MWh/s will that volume of water produce? a. 271 c. 275 b. 265 d. 280 42. A series circuit consists of 20 Ω resistor, a 0.20 H inductor and a 50 microfarad capacitor. If the variable frequency 120 V source is connected across its terminals, what is the resonant frequency in Hz? a. 45 c. 40 b. 55 d. 50 43. In a single-phase transformer, the core loss is 60 W at 40 Hz and 95 W at 60 Hz both measured at the same maximum value of flux density. Find the core losses in W at a frequency of 50 Hz. a. 69 c. 89 b. 77 d. 56 44. A uniform magnetic field makes an angle of 30° with the z axis. If the magnetic flux through a 1-m2 portion of the xy plane is 5 mWb, then the magnetic flux through a 2-m2 of same plane is Wb. a. 10 c. 4 b. 8 d. 5 45. A symmetrical three-phase 240 V supplies a balance delta connected load of 6 – j8 ohms per phase. What is the line current? a. 32 + j25 A c. 25 – j32 A b. 32 – j25 A d. 25 + j32 A 46. The hazards exist only during the period of time the is there. a. short-circuit c. lightning b. switching d. fault 47. A 60-Hz induction motor has 2 poles and runs at 3510 rpm. What is the synchronous speed of the induction motor? a. 3200 rpm c. 3800 rpm b. 3600 rpm d. 3400 rpm 48. At a certain region in Australia, it is necessary to supply 300 kW of 60 Hz power. The only power sources available operate at 50 Hz. It is decided to generate the power by means of a motor-generator set consisting a synchronous generator. How many poles should each of the two machines have in order to convert 50 Hz to 60 Hz power? a. A 10-pole synchronous motor coupled to a 10-pole synchronous generator b. A 12-pole synchronous motor coupled to a 12-pole synchronous generator c. A 12-pole synchronous motor coupled to a 10-pole synchronous generator d. A 10-pole synchronous motor coupled to a 12-pole synchronous generator 49. 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? a. twice that in resistor 2 b. half that in resistor 2 c. four times that in resistor 2 d. the same as that in resistor 2 50. A certain capacitor in series with a resistor, is being charged. At the end of 10 ms, its charge is half the final value. What is the time constant on this process in ms? a. 2.3 c. 6.9 b. 10 d. 14 51. What is the function of the surge tank in hydropower plant? a. relieve water hammer pressures in the penstock pipe b. produce surge in the pipe line c. relieve water pressure in the boiler d. supply pressure at constant temperature 52. Two identical coupled coils have an equivalent inductance of 80 mH when connected series aiding, and 35 mH in series opposing. What is the value of the coefficient of coupling k? a. 0.319 c. 0.391 b. 0.913 d. 0.139 53. Which of the following is NOT a property of magnetic field lines? a. The field is stronger where the lines are closer together b. The lines intersect surfaces of equal intensity at right angles c. Magnetic field lines have no beginning and no ends d. The lines cross themselves only at right angles 54. What is the maximum speed at which a 60 Hz synchronous machine can be operated? a. 3400 rpm c. 3600 rpm b. 3200 rpm d. 3000 rpm 55. What is the value of the resistor with color coded green-blue-redgold? a. 56000 ohm + 10% c. 5600 ohm + 10% b. 56000 ohm + 5% d. 5600 ohm + 5% 56. Is a ground can be intentional or accidental? I. True II. False a. I only c. Both I and II b. II only d. Either I or II 57. In an oscillating LC circuit, the total stored energy is U. The maximum energy stored in the capacitor during one cycle is . a. U/2 c. U/2π b. U d. U/π 58. Given the following phase sequence currents: Ia = 3.5 + j3.5 ; Ib = j3 ; and Ic = -2.6 + j1.5 . Determine the negative sequence current for phase A? a. 0.313 + j0.678 c. -0.313 + j0.678 b. -0.313 - j0.678 d. 0.313 - j0.678 59. What is the function of protection relays in the protection scheme? a. switching device c. time delay device b. breaking device d. sensing device 60. Three single-phase transformers rated 25 kVA each are connected in delta-delta to supply a balance load of 75 kVA. One transformer is removed for repair. What is the kVA of each remaining transformer? a. 43.3 c. 57.7 b. 50 d. 34.3 61. A capacitor C is connected in parallel with a series combination of capacitors of 8 and 4 microF. The voltage drop across capacitor C is 12 V. The 3 three capacitors have been connected for sometime and have reached their present value. Find the voltage across capacitor with 8 microF. a. 4 V c. 3 V b. 9 V d. 8 V 62. A power plant consumes 3000 tons of coal per day. The coal has an average energy content of 10000 BTU/lb. The power plant has an overall efficiency of 25%. What is plant power output in MW? a. 187 c. 181 b. 183 d. 185 63. A rice mill will be served by two units of 50 kVA transformers, 7.620 kV/240 V. The transformers will be installed as open-delta bank to serve the three-phase load of the rice mill. What is the maximum kVA load that this bank can carry without overloading? a. 75.5 c. 50 b. 86.6 d. 100 64. Calculate the power required to raise a 639 kg mass, 20.74 m in 2.120 minutes. a. 1.430 kW c. 1.340 kW b. 1.022 kW d. 1.220 kW 65. What is the electrical analog of a spring constant “k”? a. 1/C c. C b. L d. 1/L 66. The starting/ in rush current of the transformer is generally times of its full-load current. a. 12 c. 10 b. 20 d. 6 67. Find the power factor of a circuit that absorbs 1.5 kW for a 230-V input voltage and an 8-A current. a. 0.815 c. 0.852 b. 0.781 d. 0.798 68. A symmetrical positive-sequence four-bus z matrix with Z11 = j0.27, Z12 = j0.24, Z13 = j0.17, Z14 = j0.20, Z22 = j0.29, Z23 = j0.20, Z24 = j0.24, Z33 = j0.3 Z34 = j0.26, and Z44 = j0.38, all in p.u., what is the three-phase fault at bus 3? a. -j2.78 p.u. c. -j3.33 p.u. b. -j3.70 p.u. d. -j2.63 p.u. 69. The current in a coil decreases from 30 A to 10 A in 0.2 sec. If the self-inductance of the coil is 4 H, what is the induced emf in V? a. 400 c. 350 b. 450 d. 300 70. The rotor of a 3-phase, 60 Hz, 4-pole induction motor takes 120 kW at 3 Hz. What is the rotor speed of the induction motor? a. 1710 rpm c. 1800 rpm b. 1810 rpm d. 1700 rpm 71. A transformer takes 5.175 kW at a power factor of 0.85 when connected to a 2.3 kV distribution circuit. What is the current input in Amp.? a. 2.51 c. 2.65 b. 2.45 d. 2.81 72. If |Vs| = |Vr| = 33 kV (three-phase) and 13 ohm per phase, what will will be the maximum power transmission per phase? a. 30 MW c. 28 MW b. 29 MW d. 60 MW 73. Which of the following transformer winding connection is MOST suitable for an unbalanced load? a. open-delta c. four-wye b. three-wye d. delta 74. Which of the following instrument is suited for high frequency measurements? a. Dynamometer c. Moving iron vane b. Oscilloscope d. Thermocouple 75. What is the actual voltage of the high-leg (middle) for the threephase, four-wire delta grounded system 240/120V secondary voltage? a. 170 V c. 138 V b. 208 V d. 199 V 76. Positive charge is distributed uniformly throughout a non-conducting sphere. The highest electric potential occurs a. far from the sphere c. just outside the surface b. at the center d. at the surface 77. An ideal transformer has voltage rating of 2400/240 V, a motor is connected to the secondary draws 40 A at 200 V. What resistance must be connected to maintain this voltage? a. 1.5 ohm c. 0.75 ohm b. 1 ohm d. 0.50 ohm 78. 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? a. current c. voltage b. current density d. end-to-end potential difference 79. A balanced-delta connected load consisting of pure resistances of 15 ohm per phase is in parallel with a balanced-wye load having phase impedance of 8 + j6 ohm. Identical impedances of 2 +j5 ohm are in each of the three lines connecting the combined loads to a 110-V, three-phase supply. Determine the current drawn from the supply and the line voltage at the combined loads. a. 10 A, 58.47 V c. 8 A, 48.72 V b. 14 A, 84.38 V d. 15 A, 75.95 V 80. The tesla is a unit of . a. inductance c. capacitance b. magnetic flux density d. permittivity 81. Which of the following limits the number of coils that may be placed on the armature of a DC motor or generator? a. coil to coil arcing due to breakdown of insulation b. the sizes of the load on the motor c. the type of winding used d. the number of poles 82. The per-phase line loss in a 40 km long transmission line is not to exceed 60 kW while it is delivering 100 A per phase. If the resistivity of the conductor material is 1.72 x 10^-8 ohm-meter, determine the required conductor diameter. a. 1.2071 cm c. 1.2083 cm b. 1.7121 cm d. 1.2204 cm 83. What is the allowable rating for branch overload protection if fuse is used for a hermetic motor compressor with a rated load current of 37 A? a. 30 A c. 35 A b. 25 A d. 20 A 84. Two 110-V light bulbs, one “25W” and the other “100W” are connected in series to a 110 V source. Then, which of the following statement is correct with regard to above sentence? a. none of these b. the current in the 100-W bulb is less than that in the 25-W bulb c. each bulb will have a potential difference of 55 V d. the current in the 100-W is greater than that in the 25-W bulb 85. A 15-ohm resistor is connected in parallel with a series combination of resistors of 8 and 12 ohms. If the voltage drop across the 8-ohm resistor is 48 V, what is the total current in A? a. 16 c. 22 b. 18 d. 20 86. A parallel plate capacitor with plates of area A that are separated a distance d by air is initially charged with charge q. The energy stored in the capacitor initially is E. The plates are then separated by 2d. What is the new energy stored in the capacitor? a. 1/2 E c. 2E b. 0 d. E 87. A coil of wire having a resistance of 3.75 ohm and carrying a current of 0.3 A is in parallel with an unknown resistance through which there is a current of 1.5 A. Determine the total equivalent resistance. a. 0.625 ohm c. 0.489 ohm b. 0.865 ohm d. 0.549 ohm 88. The primary of a transformer has 200 turns and is excited by a 60 Hz, 200 V source. What is the maximum value of the core flux? a. 6.13 mWb c. 3.41 mWb b. 4.13 mWb d. 5.31 mWb 89. A source with an impedance of 100 Ω is connected to the primary coil of a transformer and a resistance R is connected to the secondary coil. If the transformer has 100 turns in the primary coil and 100 turns in its secondary coil, the greatest power will be dissipated in the resistor if R = Ω. a. 50 c. 100 b. 0.25 d. 4 90. The magnetic torque exerted on a flat current-carrying loop of wire by a uniform magnetic field B is . a. maximum when the plane of the loop is perpendicular to B b. independent of the orientation of the loop c. maximum when the plane of the loop is parallel to B d. dependent on the shape of the loop for a fixed loop area 91. Two resistors are connected in parallel across a potential difference. The resistance of resistance of A is twice that if resistor B. If the current carried by resistor A is I, then what is the current carried by B? a. 4I c. I/4 b. 2I d. I/2 92. The growth rate of the energy consumption in our country is 6.9%. In how many years will the energy be quadrupled? a. 20 c. 30 b. 15 d. 25 93. The growth rate of the energy consumption in our country is 6.9%. In how many years will the energy be quadrupled? a. 16 yrs c. 22 yrs b. 20 yrs d. 18 yrs 94. A wind generator with an efficiency of 80% has blade diameter of 20 m. If the wind velocity is 35 km/h, how much power in kW is obtainable from the generator? a. 55.75 c. 53.54 b. 54.78 d. 77.23 95. Which of the following is/are the MOST important factor/s to considered in the selection of fuel for power plants? I. Cost of fuel II. Calorific value of fuel a. I only c. II only b. Either I or II d. Both I and II 96. What is ACSR conductor stands for? a. Anodized Core Steel Reinforced b. Aluminum Cable Stranded Reinforced c. All Conductor Surface Reinforced d. Aluminum Cable Steel Reinforced 97. A certain galvanometer has resistance of 100 Ω and required 1 mA for full scale deflection. To make this into a voltmeter reading 1 full scale, connect a resistance of . a. 1000 Ω in parallel c. 900 Ω in parallel b. 1000 Ω in series d. 900 Ω in series 98. If an appliance has a motor load of 12-A and a heating load of 15-A. that is required ampacity of the branch circuit conductors? a. 35 A c. 20 A b. 25 A d. 30 A 99. The government agency created under Presidential Decree 269, whose additional mandates include preparing electric cooperatives in operating and competing under a deregulated electricity market. a. National Electrification Administration b. National Electrification Commission c. National Grid Corporation d. National Power Corporation 100. A 3 Ω and 1.5 Ω resistors are wired in parallel and the combination is wired in SERIES to a 4 Ω resistor and a 100V emf device. What is the current in the 3 Ω resistor? a. 6.7 A c. 0.33 A b. 0.67 A d. 3.3 A 101. Who is the chairman of Board of Electrical Engineering in the Philippines? a. Geian Vincent Sanchez b. Elynn Mae Ramayrat e. None of the Above c. May Dolorfino d. Nino Cabiso f. John Rey Abanilla PLEASE KEEP THIS MATERIAL TO YOUR SELF AND DO NOT SHARE WITH NON-CERTC REVIEWEES.
