EE Actual & Pre-board Objectives PDF

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Apr. 2018 In the transformers A. high tension winding is used near the core C. low tension winding is used near the core B. high tension winding is used away from the core D. low tension winding is used away from the core Apr. 2018 Which of the following parameters can be neglected for a short line?...

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Apr. 2018 In the transformers A. high tension winding is used near the core C. low tension winding is used near the core B. high tension winding is used away from the core D. low tension winding is used away from the core Apr. 2018 Which of the following parameters can be neglected for a short line? A. resistance B. inductance C. reactance D. capacitance Apr. 2018 The curve representing Ohm’s law is A. a parabola B. linear C. a sine function D. a hyperbola Apr. 2018 The overcurrent protective device is caused to operate by ______________________. A. voltage surge B. current flow C. voltage drop D. impedance Apr. 2018 What is the maximum number of bends permitted in rigid conduits between outlets? A. 4 quarter bends B. 6 quarter bends C. 2 quarter bends D. 3 quarter bends Apr. 2018 Which of the following insulators will be selected for high voltage application? A. strain type B. disc type C. suspension type D. pin type Apr. 2018 If the torque angle δ continuously increases, system will become A. stable B. unstable C. oscillatory stable D. asymptotic stable Sept. 2014/Apr. 2018 The condition in Ohm’s law is that A. ratio V/I should be constant C. the temperature should remain constant B. current should be proportional to voltage D. the temperature should vary Sept.2015/Apr. 2018 Which of the following shall be included in the calculation of the reliability standard indices of the distributor asset by the Philippine Distribution Code? A. Outages that occur on the secondary lines of the distribution system B. Planned outages where the customers have been notified at least three (3) days prior to the loss of power C. Outages that occur on the primary lines of the distribution system D. Outages that occur in the transmission line Sept.2015/Apr. 2018 A type of electronics communication in which only one party transmits at a time. A. Full duplex B. Half duplex C. Bicom D. Simplex Apr. 2018 Base load plants are designed to supply power at A. low capital cost and low operating cost C. low capital cost and high operating cost B. high capital cost and low operating cost D. high capital cost and high operating cost Apr. 2018 Peak load plants are designed to supply power at A. low capital cost and low operating cost C. low capital cost and high operating cost B. high capital cost and low operating cost D. high capital cost and high operating cost Apr. 2018 If the effect of earth is taken into account, then the capacitance of line to ground A. decrease B. increase C. remain unchanged D. become infinite Apr. 2018 The effective resistance of conductor is increased by A. skin effect B. proximity effect C. corona effect D. both (a) and (b) Apr. 2018 A two terminal pair of network of a transmission line can be represented by a A. π-network B. T-network C. either (a) or (b) D. three network Apr. 2018

16. In television system, channels 2 and 13 are classified as A. VHF B. UHF C. SHF D. EHF Apr. 2018 17. An ACSR conductor has (n-1) layers around its single center strand, the total number of strands will be A. 3n2 + 3n + 1 B. 3n2 - 3n - 1 C. 3n2 + 3n - 1 D. 3n2 - 3n + 1

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Apr. 2018 Which of the following methods of generating electric power from the sea water is more advantageous? A. water power B. ocean power C. Tidal power D. none of these Apr. 2015/Apr. 2018 When installing two grounding electrodes, the minimum distance between them is A. 1,800 mm B. 2,000 mm C. 1,500 mm D. 2,400 mm Feb. 2014/Apr. 2018 The current flowing in L and C at parallel resonance are A. zero B. equal C. infinite D. different Apr. 2018 What does PEMC in EPIRA stands for? A. Philippine Energy Market Corporation C. Philippine Electricity Market Corporation B. Private Energy Marketing Company D. Philippine Electrical Marketing Corporation Apr. 2018 For two alternators operating in parallel, if the load shared by one of them is to be increased, its field excitation is A. to be strengthened keeping input torque the same B. to be weakened keeping input torque the same C. to be kept constant but input torque should be increased D. to be kept constant but input torque should be decreased Apr. 2018 Open circuit test on transformers is conducted to determine A. hysteresis loss B. copper loss C. core loss D. eddy current loss Apr. 2018 Which of the following power plant is a conventional source of energy A. Solar energy B. Geothermal energy C. Coal energy D. Wind energy Apr. 2018 In a synchronous motor, the magnitude of stator back emf depends on A. load on the motor C. both the speed and rotor flux B. dc excitation only D. none of these

26. Alternators installed in a hydro power plant, are of A. low speed B. high speed

C. medium speed

D. very high speed

27. In a loss-free RLC circuit, the transient current is A. oscillating B. square wave

C. sinusoidal

D. non-oscillating

28. At very low frequencies a series RC circuit behaves as almost purely A. resistive B. inductive C. capacitive

D. none of these

29. One of the advantages of distributing the winding in alternators is to A. reduce harmonics C. improve voltage waveform B. reduce the amount of copper D. decrease the value of the voltage 30. The effect of corona is A. increased reactance

B. increased inductance C. increased energy loss

D. all of these

31. The rms value of pure cosinefunction is A. 0.5 of peak value B. 0.707 of peak value C. same as peak value

D. zero

32. What is the equivalent IEEE device function number for directional power relay A. 21 B. 32 C. 37

D. 87

33. Energy radiated continuously in the form of lighting waves is called? A. luminous intensity B. lumen C. luminous flux

D. illumination

34. Efficiency is secondary consideration in case of A. base load plants B. peak load plants

C. both base load and peak load plants D. none of these

35. The condition of a liquid electrolyte is measured in terms of its A. current value B. specific gravity C. acid content 36. If the field of a dc shunt motor is opened A. it will continue to run at its rated speed B. the speed of the motor will become very high

D. voltage output

C. the motor will stop D. the speed of the motor will decrease

37. An ideal full-wave rectifier with non-inductive load has zero transformation losses. What is the efficiency? A. 70% B. 80% C. 90% D. 100% 38. The dummy coil in dc machines is used to A. eliminate reactance voltage B. eliminate armature reactance

C. bring about mechanical balance of armature D. eliminate harmonics developed in the machine

39. The purpose of insulating oil when used on power circuit breaker are the following, EXCEPT; A. Coolant B. Interrupter C. Quencher D. Insulation 40. Inside a hollow spherical conductor A. electric field is zero B. electric field is constant C. electric field changes with distance from the center of the sphere D. electric field is unity 41. Residual magnetism is necessary in a A. separately excited generator B. self-excited generator

C. both of these D. none of these

42. In case of delta connected circuit, when one resistor is open, power will be A. unaltered B. reduced to 1/9 C. reduced to 1/16

D. reduced by 1/3

43. Transient current in an RLC circuit is oscillatory when A. R =0

B. R = √

C. R > √

D. R < √

44. With reference to armature windings, wave windings are often called _________ windings. A. concentric B. series C. parallel D. ring 45. This is the compact arrangement of switching devices; A. Circuit protector B. Switchboard C. Switchgear D. Panelboard Apr. 2015/Sept. 2015/Sept 2016/Sept 2017 46. Which of the following is NOT INCLUDED in the Technical Performance Standards for Distribution and Supply set by the Philippine Distribution Code? A. Power Quality B. Reliability C. Collection Efficiency D. System Efficiency Feb. 2014/Sept 2016/Sept 2017 47. Which plant takes the least time in starting from cold condition to full load operation? A. Steam turbine power plant C. Gas turbine power plant B. Hydro power plant D. Nuclear power plant Sept 2017 48. What is the equivalent IEEE device number for an under voltage relay? A. 67 B. 52 C. 27 D. 51 Sept 2017 49. To adjust the power of the alternator, adjust the _______________. A. power factor B. governor C. field current D. frequency Sept 2017/Apr. 2018 50. In a transmission line of negligible resistance, the surge impedance will be _______________. A. square root of LC B. square root of L/C C. square root of 1/LC D. square root of C/L

Sept 2017 51. What is the purpose of reactor in short circuit? A. To open the line in short circuit B. To decrease the circuit resistance

C. To lessen the current in short circuit D. To increase the current in short circuit

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Sept 2017 What is the maximum output power of a cellular transmitter? A. 4.5 w B. 1.5 w C. 3 w D. 6 w Sept 2017 For constant transmission efficiency, voltage is increased n times, the size of the conductor would be _________________________. A. reduced to (1/n) times of the original C. increased to n2 times of the original 2 B. reduced to (1/n ) times of the original D. increased ton times of the original Sept 2017 Copper loss of a transformer is determined by means of a/an _____________ test. A. open-circuit B. polarity C. short-circuit D. inductive-circuit Sept 2017 The power transmission capacity of the transmission is ______________________. A. inversely proportional to the voltage C. proportional to the square of the voltage B. directly proportional to the voltage D. proportional to the cable of the voltage Sept 2017 The under voltage relays are usually used for what protection of the electrical equipment? A. feeder protection B. motor protection C. transformer protection D. bus-bar protection Sept 2017 Which of the following type of fault used only the equivalent positive sequence impedance of the circuit in the short circuit calculation? A. Line to Line B. Line to ground C. Double line to ground D. Three-phase fault Sept 2017 What device used to measure the temperature of a motor winding while the motor is in operation? A. Seismic probe C. Thermocouples B. Resistance temperature detector D. Proximity probe Sept 2017 Which of the following is a primary disadvantage of FM over AM? A. Lower efficiency C. Higher cost and complexity B. Noise susceptibility D. Excessive use of spectrum space Sept 2017 Which of the following that the voltage regulation is one of the important factors consider in the electrical power design? A. generator B. transmission line C. feeder D. transformer Sept 2017 Which of these is not a factor in the selection of fuse rating for protection of a branch circuit? A. Branch full-load current C. Branch fault-current B. System impedance D. System voltage Sept 2014/Sept 2017 Which of the following principle will the operation of fiber-optic cable is based? A. dispersion B. refraction C. reflection D. absorption Sept 2017 When the voltage remains the same, the current will ________________ as the impedance decrease I. decrease II. Increase A. I only B. Both C. Either I or II D. II only Sept 2017 When electrons build up pressure at one point, it is called ___________________. A. ganging B. current flow C. impedance D. pressure filing Sept 2017 Which of the following type of fault used only the equivalent positive and negative sequence impedance of the circuit in the short-circuit calculation? A. Double line to ground B. Line to line C. Three-phase D. Line to ground Sept 2017 Based on the Philippine Distribution Code, all users of the distribution system must maintain a certain power factor at the connection point in order to maintain power quality in the system. What power factor should be

maintained at the connection point? A. Not less than 65% B. Not less than 70% C. Not less than 85% Sept 2017 67. Which of the following is not considered in the selection of surge arrester? A. Voltage rating B. Current rating C. Class of Arrester

D. Not less than 75%

D. Insulation level

68. In full-wave rectification, if the input frequency is 60 Hz, then output has a frequency of ___________. A. 30 HZ B. 60 HZ C. 120 HZ D. 240 HZ 69. The specific gravity of a lead-acid cell is often used as a measure of its ______________. A. rate of discharge B. operating temperature C. state of charge D. life expectancy 70. The commonly used light sensor in a modern fax machine is the _______________. A. photo tube B. photo transistor C. charge couple device

D. liquid crystal display

71. A standard candle emits a total luminous flux of _____________ lumens. A. 12.57 B. 25.14 C. 78.96

D. 157.90

72. A space station with communication equipment that synchronizes with earth’s orbit. A. space craft B. space probe C. satellite

D. scape CATV

73. Impurities in an electrolyte can cause an internal short circuit condition called A. local action B. depolarization C. polarization

D. electrolysis

74. As load power factor of an alternator becomes more lagging, the value of generated voltage required to give rated terminal voltage ____________________. A. increase B. decrease C. remains unchanged D. varies with rotor speed 75. In a commutator A. copper is harder than mica B. mica and copper are equally hard

C. mica is harder than copper D. none of these

76. The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer? A. Conservator B. Breather C. Bushings D. Buchholz relay 77. Centrifugal switch disconnects the auxiliary winding of the motor at about _________ percent of synchronous speed. A. 30 to 40 B. 70 to 80 C. 80 to 90 D. 100 78. The material commonly used for insulation in high voltage cables is A. lead B. paper C. rubber

D. glass

79. For a series RLC circuit at resonance, the current amplitude is _____________ for a fixed voltage amplitude and the power factor is ______________. A. minimum, zero B. minimum, unity C. maximum, zero D. maximum, unity 80. If the length of a cable is doubled, its capacitance A. becomes one-fourth B. becomes one-half

C. becomes double

D. remains unchanged

81. Wye-delta starting is equivalent to autotransformer starting with ___________ tapping. A. 73% B. 67% C. 58% D. 33% 82. These days DC motors are widely used in A. pumping sets B. air compressors

C. electric tractions

D. machine shops

83. Breather mounted on transformer tank contains A. water B. oil

C. liquid

D. calcium

84. As load power factor of an alternator becomes more leading, the value of generated voltage required to give rated terminal voltage ____________________.

A. increase

B. decrease

C. remains unchanged

85. The process by which metallic parts are demagnetized is called ______________. A. degaussing B. demagnetizing C. degrading

D. varies with rotor speed

D. degreasing

86. Synchronous motors are A. self-starting B. not self-starting C. essentially self-starting D. none of these Apr. 2017 87. It is difficult to magnetize steel because of its A. high density B. high retentivity C. low permeability D. high permeability Apr. 2017 88. Present day capacitors which have high capacitance in small size use a diameter of A. paper B. rubber C. ceramic D. mylar Apr. 2017 89. The current-carrying capacity of a copper wire having twice diameter of another copper wire is __________. A. twice B. four times C. three times D. half Apr. 2017 90. What kind of device is a diode? A. Bilateral B. Linear C. Unipolar D. Nonlinear Apr. 2017 91. If the line frequency is 60 Hz, the output frequency of a bridge rectifier is A. 30 Hz B. 60 Hz C. 120 Hz D. 240 Hz Apr. 2017 92. In a shunt generator the voltage builds up till constrained by A. speed limitation B. armature heating C. saturation of iron D. insulation restriction Apr. 2017 93. Slip rings are made of A. steel B. copper C. bakelite D. mica Apr. 2017 94. For proper parallel operation, ac polyphase alternators must have the same ______________. A. speed B. KVA rating C. Voltage rating D. excitation Apr. 2017 95. The series field of a short-shunt compound dc generator is excited by ___________ current. A. shunt B. armature C. load D. external Apr. 2017 96. The reciprocal of permeability is A. conductivity B. susceptibility C. reluctivity D. permittivity Apr. 2017 97. For which of the following sinusoids, the rms value and mean value is the same? A. sine wave B. triangular wave C. square wave D. half wave rectified Apr. 2017 98. The maximum efficiency of a half-wave rectifier is ___________. A. 40.6% B. 80.6% C. 50% D. 20.3% Apr. 2017 99. Ideal transformer assumptions do not include A. no leakage flux C. zero resistance of the winding B. no saturation of core D. zero reactance of the winding 100. If the load current and flux of a dc motor are held constant and voltage applied across its armature is increased by 10 percent, its speed will _____________. A. decrease by about 10% C. increase by about 10% B. remain uncharged D. depend on armature resistance 101. If there is an open circuit In the rotor of a SCIM, A. rotor will overheat B. motor will be noisy

C. motor will not start

D. line fuses will blow

102. In a synchronous machine when the rotor speed becomes more than the synchronous speed during hunting, the damping bars develop ________ torque. A. synchronous motor B. induction motor C. induction generation D. dc motor

103. At leading p.f., the armature flux in an alternator __________ the rotor flux. A. distorts B. does not affect C. opposes

D. aids

104. This is the rating of power circuit breakers used to be the basis in replacing its contacts. A. duty contact B. duty time C. duty rating D. duty cycle

105. The voltage applied across the resistor was reduced by 50%. The power consumed by the resistor will be reduced by ______%. A. 75 B. 50 C. 25 D. 100 106. The effect of the dielectric is to A. increase the capacitance C. increase the working voltage B. decrease the capacitance D. reduce the working voltage Sept.2014/Apr. 2016 107. The color reserved for use in equipment grounding conductor is A. Yellow B. Green C. White D. Gray Apr. 2016 108. Which of the following is not a full-duplex? A. Radar B. Telephone C. Telemetry D. Local Area Network Apr. 2016 109. In a circuit breaker, the time duration from the instant of the fault to the extinction of arc is known as A. operating time B. total clearing time C. lag time D. lead time Apr. 2016 110. 34.5 KV to 69 KV is classified as A. low voltage B. medium voltage C. high voltage D. extra high voltage Apr. 2016 111. For an RL circuit, the power factor cannot be less than _______ or greater than _________. A. 0,1 B. 1,0 C. 0,-1 D. -1,0 Apr. 2016 112. _____________ is the overall energy program formulated and updated yearly by the DOE, submitted to congress pursuant to R.A. 7638. A. Philippine Energization Program C. Philippine Electrification Program B. Philippine Energy Plan D. Philippine Electrification Plan Apr. 2016 113. The lighting load for a dwelling expressed in terms of a unit load in volt-...