Q634 - General Subjects, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. Which of the listed numeric values represents the smallest size drill?Not learned 2. Which of the drill sets listed would commonly be referred to as a “Jobbers Set”?Not learned 3. No two drills from differing drill sets are of the exact same size, with the exception of the drills measured as 0.25 inch. These two drills are the 1/4 inch and the __________.Not learned 4. When using a micrometer to measure a drill for size, you should measure across the drill __________.Not learned 5. Which of the following statements is true regarding mechanical seals?Not learned 6. Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by __________.Not learned 7. Mechanical shaft seals used on water service pumps require lubrication of the seal faces to minimize deposits of foreign matter on those surfaces. Which of the following pressures and lubricants are required?Not learned 8. Permanent centrifugal pump shaft damage due to erosion, corrosion, and wear at the stuffing box is usually prevented by __________.Not learned 9. One disadvantage of using a mechanical shaft seal instead of mechanical packing is that __________.Not learned 10. Which of the following bilge pumping applications would most likely use a non-automated centrifugal pump under manual supervision?Not learned 11. One of the consequences in continuing to operate a centrifugal bilge pump with the discharge valve closed, is that the _______.Not learned 12. Aftercoolers are used with air compressors to __________.Not learned 13. How often should the air receivers on a compressed air system be drained of moisture and emulsions?Not learned 14. Which of the following statements represents the proper procedural sequence for adjusting the metering rate of an in-line lubricator as used in a ship's service air system hose station? Assume that the pressure regulator has been properly set.Not learned 15. Which of the following statements represents the proper criteria to decide when to drain a filter/moisture separator as used in a ship's service air system hose station?Not learned 16. In accordance with 33 CFR Subchapter O (Pollution), besides retention of ballast water onboard or use of approved onboard ballast water treatment equipment, what is another acceptable means for a vessel to be in compliance with the ballast water management regulations?Not learned 17. Which of the following statements concerning the arrangements of a potable water system is true?Not learned 18. Hot water heaters used in potable water systems may have multiple heat sources, such as an electric heating element and a jacket water heated tube bundle. What is the primary purpose of such an arrangement?Not learned 19. What provision is made for sea chests for removal of solid debris restricting the entry grating into the sea chest of a machinery space sea water cooling system?Not learned 20. Which of the valves listed is NOT considered to be a hydraulic system directional control valve?Not learned 21. Which of the listed pressure-control valves would be used in a hydraulic system to temporarily divert some, or all of the pump discharge until the additional flow was required?Not learned 22. Which of the listed pressure control valves would be used to permit the completion of one action of a hydraulic system before a second action would be permitted?Not learned 23. In application, which of the listed sealing devices is most similar to an O-ring?Not learned 24. Strainers are commonly used in hydraulic systems to __________.Not learned 25. The component used in a hydraulic system to store potential energy in the form of hydraulic fluid under pressure, is the __________.Not learned 26. The output volume of a positive fixed displacement pump can be changed only by __________.Not learned 27. Both the direction of flow and fluid flow rate of a variable displacement radial piston pump are determined by the relative positions of the __________.Not learned 28. A two-stage hydraulic pump unit is used to __________.Not learned 29. With an increase in temperature, the volume of hydraulic fluid __________.Not learned 30. Which characteristic or condition will have the greatest effect on increasing a hydraulic oil's viscosity?Not learned 31. Energy losses occurring in a hydraulic system are ultimately absorbed by the __________.Not learned 32. In an electro-hydraulic steering system, damage due to rudder shock is prevented by __________.Not learned 33. What do hydraulically, servo-operated, automatic, changeover valves, used in a two-ram hydraulic steering gear accomplish?Not learned 34. While in dry-dock, what means are provided for completely draining the double bottom tanks in preparation for inspection?Not learned 35. For a typical transverse-framed deep-draft commercial vessel, what is the normal arrangement for the support of decks?Not learned 36. What is another name for the "collision" bulkhead?Not learned 37. What is one benefit of maintenance of proper air circulation in an air-conditioned cargo space?Not learned 38. A room humidistat initiates the lowering of the humidity of the conditioned supply air to a space, while the actual process is accomplished by what means?Not learned 39. In a two-stage centrifugal air conditioning system such as the one illustrated, the liquid refrigerant passes from the condenser directly to what componentNot learned 40. To prevent the unnecessary loading of an air conditioning system while maintaining the designed dry bulb temperature and relative humidity in an air conditioning system, what should be done?Not learned 41. For safe storage, the maximum allowable temperature to which refrigerant bottles should be exposed is what temperature?Not learned 42. Which of the fluids listed is suitable and commonly used as a secondary refrigerant?Not learned 43. In the presence of an open flame or hot surfaces, chlorinated fluorocarbon refrigerants decompose and form what chemical substance?Not learned 44. The "tare weight" of a refrigerant storage cylinder refers to what weight?Not learned 45. What is the pressure and condition of the refrigerant entering the receiver of a refrigeration system?Not learned 46. Why can CFC or HCFC refrigerants leaking into a confined space or in limited surroundings cause suffocation?Not learned 47. A device used to hold open the refrigeration compressor suction valve during starting to reduce the compression load is called what?Not learned 48. To prevent motor overload during start-up of a centrifugal refrigeration system, what is true concerning the compressor suction gas variable inlet guide vanes?Not learned 49. The carbon seal ring of a refrigeration compressor crankshaft mechanical seal is held in position against the stationary ring face by using what device?Not learned 50. In general, the thermal bulb for a thermal expansion valve used in a reciprocating air conditioning system is usually charged with what substance?Not learned 51. Which of the following illustrated thermal expansion valves would be appropriate to use on an evaporator coil with an 8 psi pressure drop, where externally adjustable superheat and a replaceable power element are both desiredNot learned 52. In a refrigeration system, the pressure within the power element of a thermostatic expansion valve depends directly upon what factor?Not learned 53. In a refrigeration system, the bulb for the thermal expansion valve is always located where?Not learned 54. During operating periods of a multi-box refrigeration system using a capacity controlled compressor, when only one of the evporators of a four box plant are actively being fed with liquid refrigerant, the control oil pressure acting on the hydraulic relay piston will be at what valueNot learned 55. Before charging a refrigeration unit, unless quick disconnect fittings are used, the refrigerant charging hoses should be prepared in what way?Not learned 56. Which of the valves listed is normally closed when charging the refrigeration system through the high side?Not learned 57. How should small appliances with less than three pounds of refrigerant be charged with refrigerant?Not learned 58. What must be done, at a minimum, before a system can legally be opened up for repairs while adhering to the prohibition against the venting of halogenated fluorocarbon refrigerants to the atmosphere?Not learned 59. Technicians servicing small refrigeration appliances can employ what type of recovery equipment?Not learned 60. What is the color coding for a storage container of R-134a refrigerant?Not learned 61. Which of the following fixed temperature heat-actuated fire detectors can be reused after it has detected a fire?Not learned 62. If the bearings of a piece of machinery are force-fed by a pressure-feed lubricating oil system, which statement is true?Not learned 63. A bearing using an oiling ring as a means of static oil feed must occasionally be serviced by removing the wear particles, grit, and moisture. How is this accomplished?Not learned 64. Which term represents the ability of a speed control governor to maintain prime mover speed without hunting?Not learned 65. Which of the following speed control devices is used strictly as a safety device to prevent prime mover damage and acts by shutting down the prime mover?Not learned 66. What type of temperature transmitter would be most suitable for measuring running gear bearing temperatures in a diesel engine in that it requires no contact with the bearing?Not learned 67. Which of the substances listed can be used to shield sensitive equipment from static magnetic fields?Not learned 68. In a series circuit, what is the applied voltage (or sum of the applied voltages) equal to?Not learned 69. What statement is true concerning the total resistance of a parallel circuit?Not learned 70. Three 12-volt, lead-acid, batteries connected in series will develop how many volts?Not learned 71. Which statement is true concerning the total power consumed in a parallel circuit?Not learned 72. Which of the listed temperature measuring devices installed on a large turbo-electric alternating current propulsion generator would be the most reliable for monitoring generator temperatures to avoid premature winding insulation failure?Not learned 73. According to 46 CFR Subchapter J, what is true concerning the installation of batteries used for diesel engine starting?Not learned 74. 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?Not learned 75. 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?Not learned 76. What is the function of the movable cams in a master-switch winch motor drum controller?Not learned 77. While paralleling 2 AC generators using synchronizing lamps only, when will both lamps go dark?Not learned 78. Which of the illustrated motors has an open motor enclosureNot learned 79. A split-phase induction squirrel-cage motor will not start and come up to speed, even though the rated voltage and frequency are applied. Assuming that the motor hums without rotating, which of the following troubles would MOST likely be suspected?Not learned 80. How are fuses usually rated?Not learned 81. What is the name of the type of motor control circuit that will not permit automatic restarting after power is restored, following a power failure?Not learned 82. As shown in figure "B" of the typical ground fault relay shown in the illustration, what statement concerning the leakage current setting adjustment is trueNot learned 83. Assuming the vessel has an engine control room, where is an engineers' assistance-needed alarm required to produce an audible signal?Not learned 84. By what means is an AC generator prevented from becoming motorized?Not learned 85. Upon failure of the normal power supply, by what means is the emergency generator placed on the line and connected to the emergency bus?Not learned 86. As shown in the illustrated harmonic analysis diagram, which figure represents the third harmonicNot learned 87. 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?Not learned 88. 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?Not learned 89. Which statement is TRUE concerning electric propulsion drives?Not learned 90. Which of the procedures or conditions listed could result in damaging a transistor beyond repair?Not learned 91. For a pneumatic transmission system for instrumentation purposes, if a pneumatic temperature indicator has a calibrated scale of -40 to +40°F, what would be the actual measured temperature if the transmitted pneumatic signal pressure to the indicator is 9 psig, assuming the industry standard of 3 to 15 psig is used for instrument air?Not learned 92. For a pneumatic transmission system for instrumentation purposes, if a pneumatic pressure indicator has a calibrated scale of 0 to 1000 psig, what would be the actual measured pressure if the transmitted pneumatic signal pressure to the indicator is 9 psig, assuming the industry standard of 3 to 15 psig is used for instrument air?Not learned 93. What is used to protect a direct sensing steam pressure gauge from damage from contact with steam?Not learned 94. A bearing temperature monitoring system such as that used for measuring selected propulsion plant bearings uses what technology?Not learned 95. Which of the following liquid level sensors would be most suitable for measuring the liquid level in a pressure vessel, such as a water-tube boiler steam drum?Not learned 96. In a closed-loop process control system, what statement concerning feedback is true as it relates to stability and the direction of error displacement?Not learned 97. In accordance with 33 CFR Subchapter O (Pollution), which type of Marine Sanitation Device (MSD) is used solely for the storage of sewage and flush water at ambient air pressure and temperature?Not learned 98. The arc resulting from the tripping of a circuit breaker is prevented from damaging the contacts. How is this done?Not learned 99. What is the basic similarity between a circuit breaker and a fuse?Not learned 100. 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?Not learned 101. What can be the cause of excessive heat or burning contacts in an operating motor controller?Not learned 102. 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?Not learned 103. Diesel-generators #1 and #2 are operating in parallel with each machine operating at half-capacity. Diesel-generator #1 suddenly trips out mechanically due to low lube oil pressure. The reverse power relay functions properly and trips generator #1 electrically off the board. In the absence of an automated power management system, which of the following actions should you carry out FIRST?Not learned 104. 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?Not learned 105. If a digital multimeter is setup as shown in figures "A" and "B" of the illustration, what is the status of the silicon diode if the display reads 4.7 ohms when configured as in figure "A" and reads 490 ohms when configured as in figure "B"Not learned 106. What effect will increasing the power source frequency have on the capacitive reactance of a capacitive circuit?Not learned 107. In which of the following branch circuits types would time lag fuses (or dual-element fuses) be MOST likely used?Not learned 108. Which of the following motors has a frame configuration for solid base mounting onlyNot learned 109. Four incandescent lamps are connected in series in a single circuit. If one of the lamp filaments burns out, what will happen to the other lamps?Not learned 110. What is the functional purpose of a generic electromagnetic relay?Not learned 111. From the information given in the illustration, what would be the maximum output amperage available from the emergency generator if it operated with a power factor of 0Not learned 112. In preparing a battery-operated digital megohmmeter (resistance tester) for use, what statement is true?Not learned 113. When shore power is being connected to a ship in drydock, what must be ensured, assuming that the ship's generators are rated at 450 VAC, 60 Hz with a total capacity of 5000 kW?Not learned 114. As shown in figure "A" of the illustration, with the switch closed what statement is true if "R1" and "R2" have unequal resistance valuesNot learned 115. 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 shortedNot learned 116. 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?Not learned 117. Which of the wave shapes shown in the illustration is termed a sinusoidal waveNot learned 118. According to the illustration, which of the following conditions would most likely cause Pump "A" to short cycleNot learned 119. Capacity control of a centrifugal refrigeration compressor can be accomplished by what means?Not learned 120. The components indicated as "7" and "8" as shown in the illustration, are known as the __________Not learned 121. Through which of the components shown in the illustration is flash gas formation a normal occurrenceNot learned 122. The most cost-effective method of recovering refrigerant from a low-pressure chiller with more than 500 lbs. of refrigerant and to meet EPA requirements is to recover the refrigerant using what protocol?Not learned 123. The counterbalance valve (5) in the winch circuit shown in the illustration ________Not learned 124. The device illustrated would be best used as a __________Not learned 125. Which of the devices listed is used to maintain a snug interface between the rotating and stationary seal members shown in the illustrationNot learned 126. The device shown in the illustration is commonly known as a/an __________Not learned 127. Which of the following components listed is shown in the illustrationNot learned 128. Which of the following compressors would be used for a dead ship start-up of a ship's service diesel- generator on a motor ship?Not learned 129. Which of the following illustrations represents the proper method of circuit grounding for a low level analog signal cableNot learned 130. Which of the following refrigerants is normally classified as a low-pressure refrigerant based on a relatively high boiling point?Not learned 131. Which of the following statements is correct for the illustrated circuit in figure "B"Not learned 132. Which of the following statements is true concerning the gauge labeled "A" of the illustrated gauge manifold setNot learned 133. In a forced-feed lubrication system, what statement is true concerning lube oil reservoir/sump residence time?Not learned 134. The function of item "7" shown in the illustration is to __________Not learned 135. The function of the section labeled "C" in the device illustrated is to provide a/an __________Not learned 136. In the illustrated refrigeration system, what is the proper name for the component labeled "A"Not learned 137. The line labeled "C", as shown in the illustration, would be identified as the ______Not learned 138. The line labeled "G", as shown in the illustration, would be identified as the ______Not learned 139. Which of the listed components of a hydraulic system would enable the pump to be temporarily shut down, and yet still provide an instantaneous source of hydraulic force?Not learned 140. Which of the listed valve types is typically used for the low-pressure stage of a reciprocating air compressor?Not learned 141. What is meant by the term "deadband" as it applies to prime mover speed control governors?Not learned 142. For a pneumatic transmission system for instrumentation purposes, if a pneumatic temperature indicator has a calibrated scale of 40 to 140°C, what would be the actual measured temperature if the transmitted pneumatic signal pressure to the indicator is 6 psig, assuming the industry standard of 3 to 15 psig is used for instrument air?Not learned 143. A precharged bladder-type accumulator used in a hydraulic system, can be potentially dangerous if __________.Not learned 144. Over pressurization of an air compressor intercooler is prevented by which of the following?Not learned 145. Referring to the illustrated motor ship freshwater cooling system drawing, which cooling system has cooling water passing through passages within components that are continuously undergoing motionNot learned 146. Referring to the illustrated motorship freshwater cooling system drawing, which cooling system tanks are MOST likely to have oil separation capabilityNot learned 147. Referring to the illustrated motorship freshwater cooling system drawing, what statement is true concerning the evaporatorNot learned 148. Referring to the illustration, note that the solenoid in line "C" is closed. The check valve in line "E" is open. The separator service pump is running. The check valve in line "G" is closed. Valve "B" is closed. Valve "D" is open. What is the operational status of the oily-water separator unitNot learned 149. As shown in figure "B" in the illustrated block diagram of a central operating system configured for supervisory control, what is the function of the block "ANALOG (A-D MUX)"Not learned 150. As shown in figure "A" of the illustrated block diagram of a central operating system configured for direct digital control, what does the output system block "DIGITAL CONTACT" representNot learned 151. As shown in figure "A" of the illustrated block diagram of a central operating system configured for direct digital control, what does the output system block "DIGITAL OUTPUT" representNot learned 152. What statement is true concerning the term "isochronous" as it applies to prime mover speed control governors?Not learned 153. The term "oil foaming" in refrigeration practice, is used to describe what event?Not learned 154. A vessel is in compliance with federal regulations regarding the discharge of sewage by __________.Not learned 155. What is the ampere-hour rating of a lead-acid battery rated for a 20 hour capacity that can deliver 10 amperes continuously for 20 hours without dropping below 90% of its rated terminal voltage?Not learned 156. When configuring a digital multimeter as an ohmmeter, what will MOST likely be displayed on the screen when the test leads are shorted together?Not learned 157. The safety heads of most large reciprocating compressors used in refrigeration systems are held in place by what means?Not learned 158. How is accidental flooding of the engine room bilges through the bilge system prevented?Not learned 159. The rudder torque capacity of the four-ram steering gear illustrated, is rated at 44,210,000 inch-pounds with one power unit in operation. If the four-ram system was able to be operated as a two-ram system with both power units on line, what would be the available torqueNot learned 160. Which of the illustrated motors has an open, drip-proof (ODP) motor enclosureNot learned 161. During operating periods of a multi-box refrigeration system using a capacity-controlled compressor, when all of the evaporators of a four box plant are actively being fed with liquid refrigerant, the control oil pressure acting on the hydraulic relay piston shown in the illustration will be at what valueNot learned 162. Which of the following illustrated thermal expansion valves would be appropriate to use on an evaporator coil with a 2 psi pressure drop, where externally adjustable superheat and a replaceable power element are both desiredNot learned 163. If a digital multimeter is set up as shown in figures "A" and "B" of the illustration, what is the status of the silicon diode if the display reads 5 megohms when configured as in figure "A" and the display reads infinite (OL) megohms when configured as in figure "B"Not learned 164. Technicians servicing small refrigeration appliances can employ what type of recovery equipment?Not learned 165. As shown in the illustrated harmonic analysis diagram, which figure represents the fundamental (or first harmonic)Not learned 166. In a forced-feed lubrication system, what statement is true concerning lube oil reservoir/sump residence time?Not learned