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Assistant Engineer (Steam-Motor-Gas Turbine Plants (Limited))
Q615 — Electrical, Electronic, & Control Engineering
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1. A salinity indicator system such as that used to measure the salt content of potable water systems and boiler feed and condensate systems uses what technology?
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2. In the event of a power failure during cargo loading operations, the movement of an electric powered cargo winch will be stopped by what means?
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3. In an impressed current cathodic hull protection system, what statement is true concerning the composition and arrangement of the anodes?
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4. While monitoring an impressed current cathodic hull protection system, which of the following measurements should remain constant in a properly operating electronically regulated system?
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5. Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out?
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6. How may the unit "hertz" be best described?
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7. The multiplier prefix "giga" (G) such as used in "gigabytes" represents what multiplication factor?
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8. Before working on an electric cargo winch master switch or controller, what should be done?
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9. Contact with any energized electrical system conductor is potentially hazardous and precautions should be taken to prevent exposure. With all other factors considered equal (such as voltage, conducting path through the body and the duration of contact), contact with an energized electrical system conductor of which system type would produce the most damaging effect?
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10. Which of the following devices would be forbidden to use as a primary means of electrical isolation?
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11. Which of the following voltage testers would be associated with high quality, be safe to use, and minimize the electric shock hazard?
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12. In order for a live-line tester to be used to test and prove dead a high voltage circuit, what must be done to verify the ability of the tester to detect a voltage?
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13. Which of the substances listed can be used to shield sensitive equipment from static magnetic fields?
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14. Which of the electrical schematic symbols shown in the illustration represents a normally closed limit switch
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15. Why are large cable sizes often formed as individual conductors comprised of several smaller strands?
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16. What would be the total capacitance of the circuit illustrated in figure "A" if the value of capacitor C1 was 100 microfarads and capacitor C2 was 50 microfarads
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17. In a series circuit, what is the applied voltage (or sum of the applied voltages) equal to?
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18. Which of the electrical properties listed will always be the same across each component in a parallel circuit?
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19. What statement is true concerning the total resistance of a parallel circuit?
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20. If a circuit has resistances of 5, 10, and 20 ohms connected in parallel, what is the combined total resistance of the circuit?
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21. For the purpose of calculating line current, which of the following procedures should be used to determine the total line current of a three-phase, delta wound, AC generator?
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22. What is a useful instrument for checking 3-phase AC motor performance by measuring possible unbalanced currents?
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23. An internal resistance is placed in series with the meter movement of which of the following instruments?
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24. How should the shunt used in an ammeter be connected?
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25. What practice could potentially damage a multimeter?
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26. According to 46 CFR Subchapter J, what is true concerning the installation of batteries used for diesel engine starting?
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27. Which of the listed battery charging circuits is used to maintain a wet cell, lead-acid, storage battery in a fully charged state during long periods of disuse?
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28. Which of the following activities occurs during the charging process of a lead-acid storage battery?
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29. Why must caution be exercised during the charging of flooded lead-acid storage batteries?
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30. What condition associated with a lead-acid battery cell can cause the plates to partially short-out and cause the cell to fail to hold a charge?
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31. What is the nominal open-circuit cell voltage of one lead-acid storage battery cell?
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32. The nominal voltage of one cell of a wet cell nickel-cadmium battery is approximately how many volts?
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33. What is the best method of determining the state of charge of a flooded lead-acid storage battery?
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34. What should you be aware of when checking the specific gravity of the battery electrolyte with a hydrometer?
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35. As the electrolyte level in the cells of a lead-acid battery evaporates over time, what will tend to happen to the specific gravity of the electrolyte in the cells as the level drops due to evaporation?
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36. Assuming that the electrolyte has had sufficient time to be uniformly diffused throughout the cell, if the open-circuit cell voltage as measured by a digital multimeter is 2.12, what would be the approximate specific gravity?
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37. How can the loss of residual magnetism in an alternator with a brushless excitation system be corrected?
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38. What is the function of the movable cams in a master-switch winch motor drum controller?
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39. In the schematic of the electrical circuit shown in figure "A" of the illustration, assuming that C1 and C2 are equal in capacitance, what is the value of the total capacitance, when compared to the value of equal individual capacitors
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40. Which of the following pictures shown in the illustration is a control transformer, usually used to step down line voltage for supplying reduced voltage control circuits
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41. What is the primary purpose associated with the use of transformers onboard ships with AC generators?
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42. Of the listed factors that influence the magnitude of the voltage induced in the stator windings of an AC generator operating at a constant 60 Hz frequency, some are fixed due to the alternator design and one is variable due to alternator operating conditions. Which of the following listed factors is subject to be variable during generator operation?
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43. A DC generator which is used to supply direct current in order to provide magnetizing current to an AC generator field is commonly known as what?
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44. If it becomes absolutely necessary to run an alternator at lower than 5% below its rated frequency, in terms of output voltage, what must be done?
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45. Under unusual circumstances, it may be required to operate a ship's service generator above its rated kVA. What supplemental casualty control action will be required?
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46. How is the difference between the synchronous speed of a three-phase induction motor and its operating speed correctly expressed?
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47. What is the most practical method of controlling the RPM of a multi-speed AC motor operating at a constant frequency?
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48. What is the characteristic of a wound-rotor induction motor, with a high resistance inserted in series with the rotor winding at startup?
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49. What will be the impact of reduced voltage applied to a motor during the starting period?
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50. Which of the illustrated motors has an open motor enclosure
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51. By what means is a synchronous motor started and brought nearly to synchronous speed?
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52. Assuming that a three-phase synchronous motor is separately excited, what statement is true concerning power supplies?
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53. Not only can a synchronous motor drive a load with greater efficiency than an induction motor, a fringe benefit of the synchronous motor is the ability for power factor correction. What statement is true?
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54. Which of the listed motors will operate at the highest RPM, assuming that each operates at the same frequency?
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55. Which type of AC single phase motor will also operate on direct current?
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56. Of the following, what shipboard system is MOST likely to use the synchronous transmission system featuring a transmitter and receiver?
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57. How are fuses usually rated?
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58. In figure "1" of the illustration, what type of circuit breaker trip element is featured
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59. What type of AC motor would use a rheostat in the rotor circuit to vary the speed of the motor?
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60. Which of the following statements represents the main difference between an electromagnetic relay and an electromagnetic contactor as used in motor control and power circuits?
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61. Why are electric strip heaters used in motor controllers?
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62. As shown in figure "B" of the typical ground fault relay shown in the illustration, what statement concerning the leakage current setting adjustment is true
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63. When testing insulation resistance of electric equipment and machinery, ideally when should the insulation resistance be tested for the lowest normal insulation values?
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64. When you are making a high potential test (insulation resistance) on the motor coils of repaired electrical machinery to ground, what would a low resistance reading indicate?
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65. What would be the indication of a grounded switch or cable as measured by a megohmmeter?
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66. In testing a hand cranked megger prior to use, what statement is true?
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67. Which of the following is the only known perfect dielectric for the purpose of serving as electrical insulation?
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68. What property of a material is rated in voltage per millimeter (V/mm) of insulation thickness that the insulation can withstand without breaking down?
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69. The electrical energy necessary to power a sound-powered telephone's small vibrating bell is obtained from what power source?
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70. To facilitate communication between the wheelhouse and the steering gear room in a steering emergency where no external source of power is required, what means of two-way communication would be provided?
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71. Assuming the vessel has an engine control room, where is an engineers' assistance-needed alarm required to produce an audible signal?
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72. When a fluorescent lamp has reached the end of its useful life, it should be replaced immediately. If not, what condition could the resultant flashing cause?
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73. The timer element of a reverse power relay cannot be energized unless what condition is met?
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74. What is the name of the part of the shipboard electrical system used to control the distribution of power to the branch circuits?
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75. Upon failure of the normal power supply, by what means is the emergency generator placed on the line and connected to the emergency bus?
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76. As shown in the illustrated harmonic analysis diagram, which figure represents the third harmonic
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77. For the purposes of high voltage marine practice, what is the threshold voltage where all voltages below this value are considered low voltage?
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78. Some shipboard high voltage systems have the neutral point of the generators bonded to the ship's hull with a neutral grounding resistor. What is the purpose of this resistor?
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79. In addition to high voltage circuit grounding with ground-connecting switching devices, for additional operator safety and confidence, portable grounding straps may be used. What is the proper procedure for connecting these portable grounding straps?
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80. When completing repairs on a high voltage circuit where portable grounding straps were used for increased operator safety and confidence, what is the proper procedure for disconnecting these grounding straps?
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81. When an alternator is to remain idle for even a few days, what should be ensured or manually accomplished?
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82. In performing routine maintenance of a ship's service alternator, what should be included?
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83. Rotor-to-stator air gap readings should be periodically taken for electrical generation equipment. What is the best tool to use to take these measurements?
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84. What should be included in the routine periodic maintenance checks for electrical motors?
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85. Which of the following methods should be used to dress the face of silver-plated contacts?
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86. The leads from an ohmmeter are attached to the leads of the opposite ends of an AC induction motor stator coil. If a reading of infinity (OL) is obtained, what does this indicate?
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87. When testing a capacitor with a digital multimeter set up as an ohmmeter, what would be the indication on the display when testing an initially discharged capacitor in good condition?
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88. What is the shape of the schematic symbol for an operational amplifier used in an analog circuit?
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89. Ships requiring extremely rapid maneuvering response using propeller shaft speed and direction as the sole means of controlling propeller thrust are most likely to use what type of drive system?
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90. How is the main shaft rotation on an AC diesel-electric propulsion vessel normally reversed?
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91. Which of the following is a disadvantage of electric drive propulsion systems?
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92. Which statement is TRUE concerning electric propulsion drives?
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93. An electric propulsion drive system in which the propulsion generator supplies power to both the propulsion motor and ship service loads is referred to as what type of system?
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94. What statement is TRUE concerning the Azipod propulsion system?
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95. In a podded azimuthing propulsion system, how is three-phase, frequency and voltage-controlled power delivered to the synchronous propulsion motor stator windings?
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96. Which of the electronic schematic symbols represents the capacitor illustrated in figure 4 of the illustration
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97. In referring to figure "A" of the illustration, what type of active filter circuit is shown
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98. Which of the following statements correctly applies to bipolar junction transistors?
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99. A voltage amplifier has a calculated voltage gain of 5. Which statement is true concerning input and output voltages?
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100. How are operational amplifiers, used primarily in analog circuits, characterized?
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101. As shown in all four diagrams included in the illustration, what type of logic circuit is represented
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102. A bearing temperature monitoring system such as that used for measuring selected propulsion plant bearings uses what technology?
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103. As shown in figure "A" of the illustrated PLC sub-circuit, what type of circuit is depicted
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104. What statement is true concerning read only memory (ROM)?
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105. Which of the following data communication cable types offers the greatest immunity to electromagnetic "noise"?
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106. Modern ships use multiple computers arranged in a client/server network to perform various shipboard functions. What type of computer network would most likely be used aboard ship?
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107. What is an ammeter used to measure?
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108. The arc resulting from the tripping of a circuit breaker is prevented from damaging the contacts. How is this done?
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109. What is the basic similarity between a circuit breaker and a fuse?
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110. When a battery-operated megohmmeter (insulation tester) is used to perform a dielectric absorption test, the resistance is measured and recorded from each conductor to ground each minute for 10 consecutive minutes. What condition accounts for a gradual rise in resistance each successive minute?
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111. Why should battery rooms be well ventilated during the charging of lead-acid storage batteries?
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112. What can be the cause of excessive heat or burning contacts in an operating motor controller?
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113. What is the characteristic that is associated with an "instantaneous-trip" single-element type fuse?
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114. What does the circuit shown in the illustration represent
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115. By what common means is the speed of an AC propulsion motor on a diesel-electric propulsion ship controlled?
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116. A common type of molded case circuit breaker has both thermal and magnetic trip elements. If a branch circuit breaker has only thermal or magnetic trip elements (but not both), it is common to use multiple series-connected protective devices to provide both short-circuit and overload protection. If a motor branch circuit is protected with both a thermal trip-type circuit breaker and fuses, what is the protective purpose of the fuses used in this arrangement?
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117. Concerning the illustrated fire detection and alarm system, when the system is operating normally and under supervision, what is the status of the ground detector and the fire alarm relays
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118. Concerning the illustrated motor controller circuit, where is the location of the motor "run" indicator light
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119. Which of the conditions listed will indicate the need to clean the insulation on the stator windings of an alternating current induction motor?
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120. If the cooling water system is isolated for repairs, but in an operational emergency, it is still desirable to run the alternator pictured in figure "A" of the illustration, what must be done
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121. What is the current flowing through R in figure "B" of the illustrated circuit when the switch is closed 3 if the battery voltage is 12 VDC and resistance of R is 2 ohms, R is 3 ohms, and R is 6 ohms, 1 2 3 respectively
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122. If a digital multimeter set up to measure AC volts reads low value, but constantly changing "ghost voltages" when its leads are disconnected, what does this indicate?
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123. Which electrical schematic symbol shown in the illustration represents a thermostat which opens on rising temperature
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124. In figure "2" of the diagram shown in the illustration, the three-phase step-down power transformer has a turns ratio of four to one. If a three-phase 480 volt supply is connected to terminals "A1-B1- C1", what voltage should develop across terminals "A2-B2-C2"
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125. In which of the following branch circuits types would time lag fuses (or dual-element fuses) be MOST likely used?
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126. Which of the following illustrated manual motor starters represents the wiring diagram illustrated in figure "A"
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127. Which of the following pictures represents a magnetic reversing or two-speed motor starter
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128. Which of the following procedures represents the best method to prevent the freezing of lead-acid batteries continuously exposed to low temperatures?
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129. What is the functional purpose of the "LSL" contacts for the hoist controller circuit shown in the illustration
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130. What is the functional purpose of the "MS 2" contacts in the hoist controller circuit shown in the illustration
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131. What is the functional purpose of the Zener diode "CR1" as shown in section "D" of the regulated DC power supply
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132. When regreasing the electric motor bearing as shown in figure "B" of the illustration, what practice should be avoided
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133. If the illustrated device in figure "B" has a step-up ratio of 10 to 1 what voltage would be measured at the secondary shortly after the primary of the device is connected to 110 volts DC and the primary current stabilized with a current of 12 amps
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134. In the illustration of the one-line distribution system diagram, if at sea the 450 VAC section of the main switchboard experiences a complete loss of power, what statement is true concerning the operation of the emergency diesel-generator
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135. Large machines undergoing a resistance insulation testing using a megohmmeter should be discharged to remove any accumulated electrostatic/capacitive/dielectric-absorption charge stored. When should this discharge be performed?
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136. Which line in figure "B" shown in the illustration represents the trailing edge of the wave
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137. Which of the listed conditions occur when selection is made for "third point hoist" on the winch hoist controller shown in the illustration
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138. A low voltage, high current testing unit consisting of an autotransformer, ammeter, and timer may be used to test the proper tripping function of a three-pole magnetic circuit breaker. What is the correct procedure for using this apparatus?
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139. Many digital multimeters now have a capacitance measurement mode. In the absence of this mode, it is possible to test capacitors in the resistance mode. Using the resistance mode, what would be the indication on the display when testing an initially discharged capacitor in good condition?
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140. If the motor shown in the illustration will not start when the "off-run" switch is placed in the run position, which of the listed components should be checked FIRST
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141. What is the name of the device that works in conjunction with an automatic voltage regulator and is used as the source of magnetizing direct current delivered to the rotating field of an AC generator?
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142. What is the name of the semiconductor device with the essential characteristic that it decreases in resistance with an increase in temperature?
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143. Why are nickel-cadmium batteries superior to lead-acid batteries for standby service?
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144. What is an ohmmeter used to measure?
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145. What are the operational characteristics of the split-phase motor shown in figure "A" of the illustration
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146. If overloading an electric motor becomes necessary in an emergency situation, what should be done to prevent damage to the motor while allowing sustained operation?
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147. In preparing a battery-operated digital megohmmeter (resistance tester) for use, what statement is true?
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148. To properly use a clamp-on-type ammeter for measuring current accurately, what must be done?
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149. The propulsion motor most often utilized in an AC drive system operating in the moderate to high power range is of what type?
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150. Referring to the containership one-line distribution diagram shown in the illustration, what is the purpose of the transformers providing power to the refrigerated container feeder bus
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151. Referring to the containership one-line distribution diagram shown in the illustration, what statement is true concerning the battery charger
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152. Referring to figure "2" of the illustration, if the inputs at A and B are both "0", what will be the outputs at "C", "D", "E", and "F" respectively
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153. Referring to figure "3" of the illustration, what type of logic gate is symbolized
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154. Referring to figure "B" of the illustration, what statement is true
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155. Referring to figure "B" of the illustration, what statement is true
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156. In referring to figure "E" of the illustration, what statement is true concerning the functional purpose of the coupling transformer
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157. In referring to the frequency response filters shown in the illustration, what determines the band pass or band stop frequencies as appropriate
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158. In referring to the graphs shown in the illustration, which of the following figures represents a bandpass filter
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159. Referring to the illustration pertaining to an alternator protection and alarm system, what statement is true concerning the component labeled "LO"
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160. Referring to the illustration pertaining to the semi-automatic navigation light panel circuit, assuming that the transfer switch is in the primary lamp position, in addition to the buzzer sounding, what will be the response of the indicator lamps when the primary lamp of the particular navigation light burns out
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161. Referring to the illustration pertaining to the semi-automatic navigation light panel circuit, if the buzzer sounds and the masthead indicator light comes on, what statement is true concerning acknowledging and responding to the alarm while minimizing the danger to navigation
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162. Referring to the impressed current cathodic protection system shown in the illustration, if required to control the current to the anodes manually by using the hand adjustment potentiometer, what statement best represents the changes that should prompt one to recheck the reference electrode voltage (hull potential)
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163. Referring to the sound-powered telephone circuit shown in the illustration, in what component are the sound-powered transmitter and receiver units located
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164. Referring to the sound-powered telephone circuit shown in the illustration, what statement is true
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165. What is the most reliable and preferred method for determining the state of charge of a wet cell NiCad battery while it is being charged?
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166. You are replacing a three-phase induction motor in an application where equipment could be damaged if the direction of rotation of the motor is incorrect when connected. Assuming that even momentarily jogging the motor could damage equipment and that the feeder phase sequence is ABC clockwise as tested with a phase sequence indicator, what should then be done to ensure that the motor rotation will be correct (clockwise) when connected electrically to the line and mechanically to the load? Assume that the power is off and that the contact-type motor rotation indicator leads are connected to the motor terminals.
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167. As shown in figures "A", "B", "C", and "D" of the illustration, what is the usual means by which the rotation direction of the motor is reversed
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168. As shown in figure "C" of the illustration, what type of timer is represented
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169. As shown in figure "A" of the digital multimeter screen shown in the illustration, what would be the significance of the symbol indicated by "1" being illuminated
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170. As shown in figure "A" of the illustrated propulsion motor variable speed drive, what statement is true
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171. As shown in figure "A" of the illustration, the load-commutated inverter drive illustrated has how many pulses
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172. As shown in figure "A" of the illustration, what phenomenon is illustrated with respect to electrical cable conductors and hull ground
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173. As shown in the illustrated block diagram for a distributed automation system, what statement is true concerning the units labeled "ROS" which are remote operating system workstations
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174. As shown in the illustrated block diagram for a distributed automation system, what statement is true concerning the workstations labeled "LOS" associated with the port power management system
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175. As shown in the illustrated diagnostic setup for locating a shorted field coil of a ten-pole synchronous motor, if 240 VAC/60 Hz is applied across the brushes, what would be the individual voltage drops measured across each field coil assuming that none of the field coils are shorted
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176. As shown in the illustrated feeder disconnect controller, what statement is true
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177. As shown in the illustrated one-line diagram of a two-tiered emergency power system for a passenger ship, what statement is true
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178. As shown in the illustrated plots of uncorrected and temperature corrected insulation resistance readings for a particular piece of equipment, at what point in time should the equipment have been refurbished or replaced
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179. As shown in the illustration, if the port propulsion motor field excitation circuit experienced a failure of an individual component, of the following listed field excitation circuit components, the failure of which component would allow the use of the standby excitation transformer and field controller to resume normal operation
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180. As shown in the illustration, what is responsible for maintaining the "UV" relay energized when the master switch handle is moved away from the "off" position
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181. As shown in the illustration, how are the rotor windings (terminating as marked motor leads M1, M2, and M3) of the motor configured
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182. As shown in the illustration, what type of motor and motor starter are featured
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183. As shown in the illustration, the wet cell storage batteries are connected in what configuration
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184. As shown in all three diagrams included in the illustration, what type of logic circuit is represented
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185. As shown in the two-speed single winding three-phase motor connection diagrams illustrated in figure "B", what is the connection scheme associated with low-speed operation
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186. A silicon-controlled rectifier (SCR) is a solid-state device used for what functional purpose?
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187. A simple, untapped, single phase 480/120 VAC step-down control transformer is rated at 600 VA at 60 Hz. What is the rated secondary load current?
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188. While standing an "at sea watch" onboard an AC diesel-electric drive ship with a synchronous propulsion motor with the ability to vary the field excitation strength and still remain in synchronism. Ideally what would be the character of the power factor associated with the main power distribution system including all motors?
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189. What statement is true concerning the electrical diagrams for the motor controller shown in the illustration
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190. What statement is true concerning the "MS 1" contacts of the master switch shown in the illustration
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191. Suppose it is desired to connect a dual voltage three-phase squirrel-cage induction motor for low volts, but it is undetermined whether the nine-lead motor is internally configured for wye or delta configuration. Using an ohmmeter, the motor itself with leads disconnected, and the illustration as a guide, what statement is true
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192. A thermal-magnetic molded case circuit breaker for a 300 kW alternator is rated at 500 amperes at full continuous load. Which of the following conditions will MOST likely trip the breaker?
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193. The transformer diagram shown in figure "B" of the illustration represents what type of transformer
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194. The turns ratio of the tapped step-down transformer shown in figure "C" of the illustration is four to one and all taps are equally spaced. If 440-volts were applied between "H1" and "H4", what would appear across "X1" and "X4"
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195. The turns ratio of the tapped step-down transformer shown in figure "C" of the illustration is four to one and all taps are evenly spaced. If 120 volts were applied to terminals "H1" and "H3", what would appear at "X1" and "X2"
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196. What type of electrical diagram for the electrical distribution system is shown in the illustration
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197. What type of electrical diagram for the steering control systems is shown in the illustration
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198. What type of motor is used in the AC hoist controller as shown in the illustration
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199. In a typical fire detection control unit, what would be indicated by an illuminated yellow light?
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200. Which of the wave shapes shown in the illustration is termed a sinusoidal wave
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201. What is the nominal output voltage of a 6-cell lead-acid battery?
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202. What statement is true concerning the electrical diagram shown in figure "B" of the illustration
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203. When configuring a digital multimeter as an ohmmeter, what will MOST likely be displayed on the screen when the test leads are shorted together?
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204. In comparing a semiconductor diode to a vacuum tube diode, what statement is true?
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205. Which of the illustrated motors has an open, drip-proof (ODP) motor enclosure
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206. What would be the total capacitance of the circuit illustrated in figure "A" if the value of capacitor C 1 was 100 microfarads and capacitor C was 200 microfarads
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207. Which of the electronic schematic symbols represents the capacitor illustrated in figure "1" of the illustration
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208. As shown in the illustrated harmonic analysis diagram, which figure represents the fundamental (or first harmonic)
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