Q693 - General Subjects, USCG prep certification 2026

Progress: 24% (23/94)

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1. For the power hacksaw shown in the illustration, how should the teeth point for the blade being installedNot learned 2. Which of the drill sizes listed represents the largest size drill?Not learned 3. Which of the drill sets listed would commonly be referred to as a “Jobbers Set”?Not learned 4. 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 5. If the cutting edges of a drill are ground at different angles, the __________.Not learned 6. What class of screw thread is indicated with a machine screw described as 1/2-13 NC-2?Not learned 7. Which of the following is true when comparing the different "class of fit" for machine threads on bolts and nuts?Not learned 8. A grinding wheel is trued with a __________.Not learned 9. A metal scribe commonly found on a combination square measuring tool should only be used to __________.Not learned 10. The center head of a combination square set is used to __________.Not learned 11. A dial indicator is used to measure __________.Not learned 12. To measure the circumference of a piece of pipe, you should use a __________.Not learned 13. Which of the instruments listed is used to measure the gauge of a piece of sheet metal?Not learned 14. Which of the following statements is true regarding mechanical seals?Not learned 15. The function of seal cages, or lantern rings installed in the centrifugal pump stuffing boxes, is to __________.Not learned 16. Which of the listed types of seals is used effectively for pumps handling toxic or highly flammable liquids that cannot be permitted to escape into the atmosphere?Not learned 17. Permanent centrifugal pump shaft damage due to erosion, corrosion, and wear at the stuffing box is usually prevented by __________.Not learned 18. One disadvantage of using a mechanical shaft seal instead of mechanical packing is that __________.Not learned 19. Which of the following bilge pumping applications would most likely use a non-automated centrifugal pump under manual supervision?Not learned 20. One of the consequences in continuing to operate a centrifugal bilge pump with the discharge valve closed, is that the _______.Not learned 21. In order to distribute the side pressures over a wide area of the cylinder walls and liners, which of the listed types of pistons are used in modern low-pressure air compressors?Not learned 22. Which of the following compressors on a motor ship would most likely operate at approximately 100 psig?Not learned 23. The general purpose of a heat exchanger is to __________.Not learned 24. If both the shell-and-tube lube oil cooler and shell-and-tube jacket water cooler of a diesel engine are sea water-cooled, what statement is true?Not learned 25. With regard to the number of passes through the tubes of shell-and-tube heat exchangers, what statement is true?Not learned 26. What is meant by the term emergency bilge suction?Not learned 27. What type of fuel oil as part of an oily-water mixture is most likely to have a density approaching that of water?Not learned 28. What type of oil as part of an oily-water mixture is most likely to require heating to facilitate separation in an oily-water separator?Not learned 29. A constant pressure range is maintained in the potable water system of many vessels by using __________.Not learned 30. Which of the following statements concerning the arrangements of a potable water system is true?Not learned 31. What is the primary purpose of the lead-lag arrangement of the two potable water pumps supporting a typical potable water system?Not learned 32. What design feature is used to minimize potable water wastage associated with hot water distribution piping for a potable water system?Not learned 33. 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 34. Which of the following statements describes the functions of a reservoir used in a hydraulic system?Not learned 35. The output volume of a positive fixed displacement pump can be changed only by __________.Not learned 36. With an increase in temperature, the volume of hydraulic fluid __________.Not learned 37. Which characteristic or condition will have the greatest effect on increasing a hydraulic oil's viscosity?Not learned 38. Energy losses occurring in a hydraulic system are ultimately absorbed by the __________.Not learned 39. In an electro-hydraulic steering system, damage due to rudder shock is prevented by __________.Not learned 40. What do hydraulically, servo-operated, automatic, changeover valves, used in a two-ram hydraulic steering gear accomplish?Not learned 41. Which of the following propulsor types would be used with unidirectional propulsion shafting rotation?Not learned 42. Concerning the operating mechanism of a controllable-pitch propeller, what statement is true?Not learned 43. Which of the following propulsor types represents the proper terminology for a Kort nozzle?Not learned 44. When an electricity generating plant features shaft-driven generators, what type of propulsor is generally used for main propulsion?Not learned 45. Which of the following propulsor types represents the proper terminology for a Z-drive?Not learned 46. The size of ball and roller bearings can be identified by the __________.Not learned 47. What is one benefit of maintenance of proper air circulation in an air-conditioned cargo space?Not learned 48. 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 49. Traditionally, which of the listed refrigerants has been more suitable than the others for use in a centrifugal refrigeration compressor?Not learned 50. Which of the fluids listed is suitable and commonly used as a secondary refrigerant?Not learned 51. The amount of HCFC-123 in a storage cylinder is measured by what means?Not learned 52. What is the physical state and pressure condition of refrigerant as it leaves a receiver in a typical refrigeration system?Not learned 53. The "tare weight" of a refrigerant storage cylinder refers to what weight?Not learned 54. What is the pressure and condition of the refrigerant entering the receiver of a refrigeration system?Not learned 55. The gas that exists in the stratosphere forming a protective shield that helps to protect the environment from the harmful effects of ultraviolet radiation is called what?Not learned 56. A device used to hold open the refrigeration compressor suction valve during starting to reduce the compression load is called what?Not learned 57. 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 58. 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 59. Rather than design an infinite variety of thermostatic expansion valve sizes to accommodate different capacities for heat removal, some manufacturers use a few standard valve body sizes in conjunction with what other feature?Not learned 60. 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 61. Refrigerant flow through a thermostatic expansion valve is greatest under what conditions?Not learned 62. 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 63. Before charging a refrigeration unit, unless quick disconnect fittings are used, the refrigerant charging hoses should be prepared in what way?Not learned 64. 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 65. In a refrigeration system, the push-pull technique can be used for the recovery of the refrigerant in what state?Not learned 66. Concerning governor speed droop, what statement is true?Not learned 67. Which term represents the ability of a speed control governor to maintain prime mover speed without hunting?Not learned 68. 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 69. In which lubrication application is a detergent type oil most likely to be used?Not learned 70. What is the operating principle of detergent type lubricating oil that provides the oil with its unique properties?Not learned 71. With respect to lubricating oils, what statement is true concerning viscosity and viscosity index?Not learned 72. Which statement is true concerning alkaline reserve as it applies to a lubricating oil?Not learned 73. In which lubrication application is a lubricating oil with an alkaline reserve most likely to be used?Not learned 74. The multiplier prefix "giga" (G) such as used in "gigabytes" represents what multiplication factor?Not learned 75. Which of the substances listed can be used to shield sensitive equipment from static magnetic fields?Not learned 76. In a series circuit, what is the applied voltage (or sum of the applied voltages) equal to?Not learned 77. Which statement is true concerning the total power consumed in a parallel circuit?Not learned 78. What practice could potentially damage a multimeter?Not learned 79. 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 80. To keep emergency lead-acid batteries in a full state of charge for emergency use, what is normally done?Not learned 81. What is the nominal open-circuit cell voltage of one lead-acid storage battery cell?Not learned 82. The nominal voltage of one cell of a wet cell nickel-cadmium battery is approximately how many volts?Not learned 83. Which of the illustrated motors has an open motor enclosureNot learned 84. What is the functional name of an electrical device which prevents simultaneous energization of loads thereby preventing damage or injury?Not learned 85. 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 86. Periodic testing using a special sensing device may be performed to detect potentially dangerous loose or corroded bus bar and controller connections. What is the name of this testing technology?Not learned 87. 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 88. What is one major advantage of a diesel-electric propulsion plant?Not learned 89. Which statement is TRUE concerning electric propulsion drives?Not learned 90. 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?Not learned 91. What does the symbol in figure "1" shown in the illustration representNot learned 92. Which of the listed temperature sensors consists of finely coiled wire, such as platinum, where the resistance varies directly with temperature?Not learned 93. 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 94. Which of the following rotational shaft speed sensors produces a digital signal?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. How would the pressure setting of the illustrated self-contained, internal-pilot, piston-operated steam pressure-reducer be reduced to a lower setpointNot learned 97. 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 desired result and using that difference to drive the actual result toward the desired result?Not learned 98. 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 99. In a closed-loop process control system featuring negative feedback, what is the function of the error detector within the controller?Not learned 100. What is another name for the control mode used in a process control system that uses two-point control?Not learned 101. 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 102. The arc resulting from the tripping of a circuit breaker is prevented from damaging the contacts. How is this done?Not learned 103. What is the basic similarity between a circuit breaker and a fuse?Not learned 104. Which of the following motors has a frame configuration for solid base mounting onlyNot learned 105. 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 106. What is the functional purpose of a generic electromagnetic relay?Not learned 107. Which line in figure "B" shown in the illustration represents the trailing edge of the waveNot learned 108. What is an ohmmeter used to measure?Not learned 109. Referring to the illustration, what is the position of the three circuit breakers labeled in figure A, B, and C respectivelyNot learned 110. 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?Not learned 111. 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 112. A silicon-controlled rectifier (SCR) is a solid-state device used for what functional purpose?Not learned 113. 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 114. According to the illustration, which of the following conditions would most likely cause Pump "A" to short cycleNot learned 115. The best tool to use to measure the number of threads per inch on a bolt is a __________.Not learned 116. Capacity control of a centrifugal refrigeration compressor can be accomplished by what means?Not learned 117. Through which of the components shown in the illustration is flash gas formation a normal occurrenceNot learned 118. Concerning the proper installation of the sensing bulb of a thermal expansion valve that is attached to the evaporator tail coil on a horizontal run, what statement is true?Not learned 119. The device shown in the illustration is a/an __________Not learned 120. Which of the figures illustrated would be LEAST desirable for use as a set screwNot learned 121. Which of the figures shown in the illustration depicts an orthographic projectionNot learned 122. The fluid used as a source of actuating power against the underside of the unloader power element piston of the refrigeration compressor capacity control mechanism illustrated is obtained from whereNot learned 123. 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 124. Which of the following illustrations represents the proper method of circuit grounding for a low level analog signal cableNot learned 125. Which of the following roller bearing types would be limited to radial thrust load applications?Not learned 126. Which of the following statements is correct for the illustrated circuit in figure "B"Not learned 127. Which of the following statements is true concerning the operation of the device shown in the illustrationNot learned 128. Which of the illustrated devices would be the LEAST accurate for the purposes of weighing-in a refrigerant chargeNot learned 129. In the illustrated pneumatically operated, diaphragm actuated control valve, what statement is true concerning the opening and closing forces acting upon the control diaphragmNot learned 130. In the illustrated refrigeration system, what is the proper name for the component labeled "A"Not learned 131. What is the length of the stud used to secure the packing gland shown in the illustrationNot learned 132. 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 133. Which of the listed temperature sensors is made of heat-treated metallic oxides and generally has a negative coefficient of resistance?Not learned 134. Which of the listed valve types is typically used for the low-pressure stage of a reciprocating air compressor?Not learned 135. The locking plates shown in the illustration are used in many marine applications. Which figure indicates the improper method for using these devicesNot learned 136. What is meant by the term "deadband" as it applies to prime mover speed control governors?Not learned 137. How would you prevent the rudder from moving while a repair is made on the steering system using the illustrated actuatorNot learned 138. A precharged bladder-type accumulator used in a hydraulic system, can be potentially dangerous if __________.Not learned 139. What is the primary function of the devices shown in the illustrationNot learned 140. The purpose of the instrument illustrated is to __________Not learned 141. Referring to the illustrated motorship fresh water cooling system drawing, which set of cooling water pumps would MOST likely require a priming maintenance system or the use of deep-well pumpsNot learned 142. Referring to the illustrated motorship freshwater cooling system drawing, what statement is true concerning the evaporatorNot learned 143. Referring to the illustrated motor ship fresh water cooling system drawing, what statement is true concerning the jacket water heaterNot learned 144. Referring to the illustrated pneumatically operated diaphragm actuated control valve, what statement is trueNot learned 145. With respect to shaft bearing load absorption capability in terms of direction, what is meant by a radial load?Not learned 146. The shaft sleeve for the pump shown in the illustration is identified by which item numberNot learned 147. As shown in figure "B" of the illustrated self-contained recovery unit connection diagrams, what is the recovery method supported by the connection schemeNot learned 148. As shown in the illustration, if figure "21" indicates the "TOP VIEW" of an orthographic projection, and figure "11" indicates the "FRONT VIEW", which figure would best represent the correct "RIGHT SIDE VIEW"Not learned 149. Which of the speeds listed represents the synchronous speed rating of the lube oil pump motor shown in the illustrationNot learned 150. Spring reinforced oil seals for retention of lubricant, are installed with the lip of the seal facing __________Not learned 151. Suppose the illustrated pneumatically operated diaphragm actuated control valve is used to control the fuel oil outlet temperature of a steam-heated heavy fuel oil heater by controlling the steam flow. What would be the result if there was a complete loss of pilot air being delivered to the valve actuatorNot learned 152. Suppose the illustrated self-contained, internal-pilot, piston-operated temperature control valve is part of the temperature control system for a steam-heated heavy fuel oil service heater for a steam boiler. If there was an increase in demand for fuel by the boiler, what statement correctly represents how the valve would initially respondNot learned 153. Suppose the pilot pressure is from 3 to 15 psig for the illustrated pneumatically operated, diaphragm actuated control valve. Assuming the control valve is trimmed for a linear response and the travel position indicator is calibrated in percentage, what would be the approximate pilot pressure if the position indicator showed the valve to be 75% openNot learned 154. Suppose the pilot pressure range is from 3 to 15 psig for the illustrated pneumatically operated diaphragm actuated control valve. Assuming the control valve is trimmed for a linear response and the travel position indicator is calibrated in percentage, what would be the approximate valve position with a 9 psig pilot pressureNot learned 155. The term "oil foaming" in refrigeration practice, is used to describe what event?Not learned 156. The term, whole depth of the gear, shown in the illustration, is equal to __________Not learned 157. What type of pump is shown in the illustrationNot learned 158. A typical oily-water separator has three stages of separation. Which statement represents the correct sequential order of the stages?Not learned 159. The working depth of the gear illustrated is represented by __________Not learned 160. What is the nominal output voltage of a 6-cell lead-acid battery?Not learned 161. What statement is true concerning the electrical diagram shown in figure "B" of the illustrationNot learned 162. Which of the projections represents the left side view of the object "X" in the illustrationNot learned 163. With regard to the relative flow patterns through the tubes and the shell of single pass shell-and-tube heat exchangers, what statement is true?Not learned 164. In comparing a semiconductor diode to a vacuum tube diode, what statement is true?Not learned 165. The safety heads of most large reciprocating compressors used in refrigeration systems are held in place by what means?Not learned 166. How is accidental flooding of the engine room bilges through the bilge system prevented?Not learned 167. 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 168. Which of the illustrated motors has an open, drip-proof (ODP) motor enclosureNot learned 169. With respect to shaft bearing load absorption capability in terms of direction, what is meant by an axial load?Not learned 170. 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 171. 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 172. What is the physical state and pressure condition of refrigerant as it enters the condenser of a typical refrigeration system?Not learned 173. Four incandescent lamps are connected in parallel in a single circuit. If one of the lamp filaments burns out, what will happen to the other lamps?Not learned