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Engine · 1,128 questions

General Subjects - USCG Exam Questions

General engineering knowledge: watchkeeping, pumps and piping systems, hydraulics, instrumentation, and shipboard maintenance.

Every question below is a real U.S. Coast Guard exam question with four choices. Answer one and the correct choice is revealed instantly, with the USCG reference and illustration where the question uses one.

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All General Subjects questions

Questions 901–1,000 of 1,128 · page 10 of 12

  1. #1948 The illustration shown represents a blueprint of a metal __________. Illustration GS-0028 illustration
  2. #1959 Which of the conditions listed does the blueprint symbol shown in the illustration represent? Illustration GS-0028 illustration
  3. #1962 Using the information in the illustration shown, the tail of the welding symbol will __________. Illustration GS-0030 illustration
  4. #1964 The exploded drawing shown in the illustration is intended to show the __________. Illustration GS-0025 illustration
  5. #1970 An 8" diameter wheel is driving a 20" diameter wheel via a pair of belts. The power input is supplied by a 5 HP motor rotating the driving wheel at 30...
  6. #1971 What statement is true concerning the purpose of an independent main thrust bearing where used?
  7. #1972 What statement is true concerning the arrangement of line shaft bearing housings?
  8. #1973 What type of bearing is most generally used as an independent main thrust block on merchant ships?
  9. #1974 What statement is true with respect to the pressure side of a propeller blade?
  10. #1975 An increase in rotor clearances in a rotary pump will __________.
  11. #1976 One of the main differences between the various types of screw pumps is in the __________.
  12. #1981 If the existing vapor pressure is subtracted from the indicated pressure at the pump suction, the remainder is the __________.
  13. #1982 Which of the following terms is used to identify the pressure of a liquid entering a centrifugal pump?
  14. #1983 Which of the following statements is true regarding mechanical seals?
  15. #1985 Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by __________.
  16. #1987 Reduced capacity, accompanied by vibration and noise at the suction of a centrifugal pump, results from cavitation in the fluid being pumped. Cavitati...
  17. #1991 Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by __________.
  18. #2028 In examining a baseline vibration signature and the historical record of periodic vibration analyses, what must be considered for the evaluation of ro...
  19. #2029 What is the most useful measurement that represents the severity of vibration associated with periodic or oscillatory motion?
  20. #2030 Probably the most useful troubleshooting tools used in a predictive maintenance management program for shipboard machinery are vibration meters, analy...
  21. #2031 The reading on the micrometer scale shown in figure "D" in the illustration is __________. Illustration GS-0081 illustration
  22. #2032 The correct torque value for a micrometer torque wrench is reached when __________.
  23. #2033 The most accurate method of measuring the setting of an inside caliper is to use a/an __________.
  24. #2034 What is the reading of the vernier micrometer caliper scale shown in figure "G" in the illustration? Illustration GS-0083 illustration
  25. #2035 The rotating part of a micrometer is known as the __________.
  26. #2036 If you are hand tapping holes in cast iron, you should __________.
  27. #2037 When internal threading for piping where the work permits the tap to be run entirely through you can begin and end the tapping of the hole by using a...
  28. #2039 Which of the devices shown in the illustration should be used with a bridge gage? Illustration GS-0073 illustration
  29. #2040 The purpose of the instrument illustrated is to __________. Illustration GS-0079 illustration
  30. #2041 The ruler indicated in the illustration is commonly referred to as a/an _________. Illustration GS-0023 illustration
  31. #2045 The letters 'NC' in '1/4-20 NC' indicates the bolt is __________.
  32. #2046 Which of the figures in illustration GS-0080 would be used in conjunction with figure "C" in illustration GS-0015? Illustrations GS-0015 and GS-0080 illustration
  33. #2047 What class of screw thread is indicated with a machine screw described as 1/2-13 NC-2?
  34. #2048 Which of the following types of nuts would be best suited to use when it is important that a nut not work itself loose due to vibration?
  35. #2049 Which figure shown in the illustration, is the nut lock improperly used? Illustration GS-0156 illustration
  36. #2059 Which of the listed temperature sensors is made of heat-treated metallic oxides and generally has a negative coefficient of resistance?
  37. #2060 A radiation pyrometer is sensitive to what form of radiation?
  38. #2062 In what electrical temperature transmitting system is the system voltage generated by the magnitude of temperature difference between hot and cold jun...
  39. #2063 Suppose that a standard remote reading bourdon tube thermometer has a scale of 40 to 240oF. If the accuracy of the thermometer is plus or minus 1% of...
  40. #2064 If it is desired to determine the temperature difference between two locations using thermocouples, what wiring technique can be used to accomplish th...
  41. #2065 What is the operating principle upon which a salinometer is based?
  42. #2066 Which of the following speed tachometers produces an analog signal proportional to the shaft speed?
  43. #2067 What statement is true concerning the arrangement and operation of the viscosity sensor as used for sensing the viscosity of heavy fuel oil?
  44. #2068 Suppose that a standard bourdon tube pressure gauge has a scale of 0 to 1000 psig. If the accuracy of the gauge is plus or minus .5% of the span, what...
  45. #2069 Vibration characteristics to establish a baseline signature or to check the mechanical condition of machinery are measured under which of the followin...
  46. #2070 A reading taken with a portable hand-held vibration meter is capable of indicating which of the following conditions?
  47. #2071 Which of the following statements is NOT a function of an effective vibration analysis program?
  48. #2072 Under which of the listed conditions can the engine room retake the throttle control from the bridge of an automated vessel?
  49. #2073 When entering an unattended machinery space to conduct maintenance or a machinery space round, what must be done?
  50. #2102 In accordance with international MARPOL Annex V regulations and federal regulations under 33 CFR Subchapter O, the discharge of plastics into the sea...
  51. #2111 In accordance with the international MARPOL Annex VI regulations, which of the listed substances are prohibited from being burned in a shipboard incin...
  52. #2112 In accordance with the international MARPOL Annex VI regulations, which of the listed substances are prohibited from being burned in a shipboard incin...
  53. #2113 In accordance with the international MARPOL Annex VI regulations, what is the minimum allowable flue gas outlet temperature for a continuous-fed shipb...
  54. #2114 In accordance with the international MARPOL Annex VI regulations, what is a permissible alternative to burning oil residue sludge in an appropriate in...
  55. #2115 The lathe tool shown as figure "N" in the illustration is commonly known as a/an __________. Illustration GS-0090 illustration
  56. #2117 The angle "A" shown on the illustrated lathe tool bit is properly called the __________. Illustration GS-0164 illustration
  57. #2119 Which lathe tool shown in the illustration would best be used on a work piece to perform a right hand facing operation? Illustration GS-0090 illustration
  58. #2120 Which of the following statements represents the difference between a four-jaw independent chuck and a three-jaw universal chuck?
  59. #2125 In machine shop practice, a center gage is used for checking the angle of __________.
  60. #2126 Before power to a lathe is turned on, it is a good shop practice to first hand feed the carriage to ensure __________.
  61. #2127 Which of the following statements best defines 'depth of cut' in lathe work?
  62. #2128 To properly cut even numbered threads using the lathe thread dial indicator shown in the illustration, you should close the lathe split or half-nut on... illustration
  63. #2129 To properly cut an odd numbered thread with a lathe using the thread dial indicator illustrated, you should close the lathe split, or half-nut on ____... illustration
  64. #2130 All straight shank twist drills must be mounted or held in a __________.
  65. #2131 Before drilling a hole in a piece of metal, the location of the hole center should be __________.
  66. #2132 Failing to decrease the feed pressure on a drill as its point begins to break through the bottom of the work piece will cause the drill to __________.
  67. #2133 Generally speaking, when using a twist drill to bore a hole in metal, the harder the metal, the greater the drill's required __________.
  68. #2135 A command signal input to the steering gear has initiated rudder movement for 20° right rudder. The follow-up mechanism at the beginning of the ru... illustration
  69. #2136 Hydraulically, servo-operated, automatic, change over valves, utilized in a two ram hydraulic steering gear, serve to __________.
  70. #2143 In a closed-loop process control system, what is meant by error?
  71. #2144 In a closed-loop process control system, what term is used to describe the action of measuring the difference between the actual result and the desire...
  72. #2145 In a closed-loop process control system, what is meant by the integral mode of control?
  73. #2146 Antifriction bearings can be removed undamaged from a shaft by using an arbor press, or wheel puller with a ________.
  74. #2147 In a compression type automatic grease cup, the lubricant is forced into the bearing by __________.
  75. #2148 Which of the following statements concerning antifriction bearings installed on pumps is true?
  76. #2155 Item "M" shown in the illustration is the __________. Illustration MO-0110 illustration
  77. #2157 What is the function of item 'D' shown in the illustration? Illustration MO-0110 illustration
  78. #2158 What is the function of device "A" shown in the illustration? Illustration MO-0110 illustration
  79. #2160 Feed water supplied to a flash type distilling plant will flash to vapor in the first-stage due to __________.
  80. #2161 The vacuum maintained in the salt water feed heater shell of a flash-type evaporator is generally accomplished by __________.
  81. #2162 Small droplets of water entrained in the flashed vapor produced in a flash-type evaporator are removed by the __________.
  82. #2163 Regarding the low pressure evaporator steam control orifice in the live steam supply line, the steam at the outlet of the orifice if not properly cond...
  83. #2164 Under normal operating conditions, the highest temperature and pressure conditions existing for flash-type evaporators will occur in the __________.
  84. #2165 What is the function of the item "7" shown in the illustration? Illustration MO-0111 illustration
  85. #2166 During operation which device listed removes air and non-condensable gases from the unit shown in the illustration? Illustration MO-0111 illustration
  86. #2167 Which device is used to prevent over pressurization of the illustrated distiller? Illustration MO-0111 illustration
  87. #2168 Which of the valve arrangements listed would be correct for operating the distillation plant shown in the illustration? Illustration MO-0111 illustration
  88. #2169 The efficiency and output capacity of a low pressure distilling plant will be reduced if the last effect shell __________.
  89. #2170 In a flash evaporator, scale as a result of higher than normal temperatures is most likely to occur in the __________.
  90. #2171 While the illustrated system is operated using the steam supply through "F" the strainer in line "4" becomes fouled, this will result in __________. I... illustration
  91. #2172 The efficiency and output capacity of a low pressure distilling plant will be reduced if the last effect shell __________.
  92. #2173 Air leaking into a flash type distilling plant could occur through __________.
  93. #2175 Irregular feeding or surging of the feed water supply to a flash evaporator may be attributed to __________.
  94. #2176 While the illustrated system is operated using the steam supply through "F" the strainer in line "4" becomes fouled, this will result in __________. I... illustration
  95. #2177 Regarding a freshwater generator of the reverse-osmosis type, what statement is true?
  96. #2178 When securing a flash-type evaporator for an extended period of time, you should __________.
  97. #2179 When performing a hydrostatic test on a low pressure evaporator to determine the source of suspected air leaks you should use __________.
  98. #2180 Sacrificial zinc anodes are used on the saltwater side of heat exchangers to __________.
  99. #2181 On which of the following heated surfaces of a flash type evaporator would you be more likely to find soft scale formation?
  100. #2182 In the operation of a two-stage flash type distilling plant, the rate of scale formation is greatly reduced by __________.

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