Assessment Test

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1. To add oil to an R-22 reciprocating compressor that has been shut down for this purpose, the oil :


2. Which is not used to lubricate a Freon-12 compressor?


3. A refrigerant oil tested to have a low neutralization number indicates:


4. The fire point of a refrigerant oil means the:


5. The dielectric property of oil refers to the:


6. Raising head pressure raises discharge temperature and:


7. It is desired to operate an air compressor with a 30.54 cm flywheel at a speed of 510 RPM. If a motor runs at 1750 RPM, what size of motor pulley should be used?


8. An air compressor is equipped with an intercooler and an after cooler to:


9. To obtain maximum efficiency, two stage air compressors are usually:


10. Aftercooler are used with air compressors to:


11. If the intercooler of a low pressure air compressor becomes fouled either internally or externally, the:


12. The heat of compression is partially removed from the compressed air by:


13. Why do we drain the condensate from the intercooler and after-coolers of an air compressor?


14. For any given volume of compressed air produced by a multistage air compressor, interstage cooling will:


15. Which of the following statements describes the function of an air compressor intake filter?


16. Moistures and impurities can be removed from the pneumatic systems by using:


17. Air line lubricators are used in compressed air systems to lubricate:


18. What is the primary function of unloading system on an air compressor?


19. Air compressor cylinder unloaders enable the compressor to:


20. In addition to pressure gauge and relief valve, an air receiver should be fitted with a:


21. Which is not true about refrigerant oils?


22. If the drive belts on an air compressor were squealing, you should fix them by:


23. If one drive belt on an air compressor is found to be worn you should:


24. What is the force which keeps the body to move in circle in uniform circular motion?


25. Zero change in velocity (Av = 0) in uniform circular motion means:


26. What particular form of reciprocating or to and fro motion in which the acceleration and velocity of the body varies as it moves from one end of its travel to the other?


27. What displacement of a rotating body is measured in radian?


28. What is the term used when one particle in the body remains stationary while every other particle moves along the circular path?


29. Energy store by virtue of stresses existing in a system is commonly related to the work done against gravity in elevating the object from arbitrary reference plane to some higher level pertains to?


30. The velocity of the liquid is large where the cross section is small, and the velocity is slow where the cross section is large, refers to what law or principle?


31. Which statement is true about rotational motion?


32. Which of the following is true about uniform circular motion?


33. The mass moment of enertia of body with respect of any line that does not pass through the center of the body is called:


34. Which condition is true about balancing of a rotating piece of machinery?


35. The energy of the body that is dependent upon the body's mass and velocity is:


36. The product of magnitude of the displacement times the components of the force parallel to the displacement is:


37. Which is an example of non-conservative force?


38. Which of the following quantities is a scalar?


39. Hydraulic piston actuators may be used when:


40. A hydraulic fluid flow control circuit, controlling linear actuator speed, with the pump operating below maximum operating pressure is known as the:


41. Pressure in an operating hydraulic system is developed:


42. The pressure of an operating hydraulic system as indicated by a pressure gauge, is a result of fluid flow overcoming:


43. Which of the following is most common type of valving element used in hydraulic system directional control valves?


44. An orifice-check valve placed in a hydraulic system is used to:


45. Which of the valves listed is NOT considered to be a hydraulic system directional control valve?


46. Which of the devices listed would be considered a hydraulic system directional control valve?


47. The purpose of a restrictor valve as it is used in a hydraulic hatch cover system, is to:


48. A device incorporating a variable orifice placed in series with a check valve in a hydraulic system is used to:


49. Which of the valves listed is not considered to be a hydraulic system directional control valve?


50. Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?


51. Which of the pressure control valves would be used to permit the completion of one action of a hydraulic system before a second action would be permitted?


52. Which of the listed pressure-control valves is used in a hydraulic system to prevent the stray movements of a vertical load until required?


53. Setting the relief valve opening pressure in a hydraulic system lower than the required operating pressure will result in:


54. As a general rule of thumb, the reservoir used in a hydraulic system should have a capacity when at the normal level, approximately equal to:


55. A reservoir as used in hydraulic systems aboard ship is used to store hydraulic oil. Another function is to:


56. An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of:


57. Some fluid filters used is hydraulic systems are designed to cope with increasing pressure differentials by:


58. At high pressure, an O-ring has a tendency to extrude into the clearance space between the mating parts of the hydraulic actuator. Which of the listed components is used to prevent extrusion?


59. In which of the listed hydraulic system components could an O-ring seal be satisfactorily used in providing a seal?


60. Which of the following devices is not considered to be a pressure vessel?


61. The purpose of an accumulator in a hydraulic system is to:


62. One function provided by an accumulator is to:


63. One function of a replenishing pump installed in many pressure-close hydraulic system is to supply fluid flow to:


64. In a fixed displacement axial piston hydraulic motor, the speed is varied by:


65. The delivery rate of an axial piston hydraulic pump is controlled by varying the position of the:


66. An axial piston, variable stroke pump is used in a vessel's hydraulic steering gear. Under pressure, oil continually leaks out from between the valve plate/ cylinder barrel and will:


67. Both the direction of flow and fluid flow rate of a variable displacement piston pump are determined by the relative positions of the:


68. For which of the following reasons is a linear actuator fitted with a cushioning device?


69. If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be:


70. When fire safe or fire resistant fluid is to be used in a hydraulic system, it is important that:


71. When normal operating pressure is applied to the hydraulic oil used in high pressure system, the oil:


72. Which of the following characteristics and conditions will have the greatest effect on increasing a hydraulic oils viscosity?


73. Lube oil temperature leaving the lube oil coolers is regulated by throttling?


74. Pressure type main propulsion turbine lubrication system, the lube oil service pumps normally take success from the main sump and discharge directly to:


75. Regulation concerning lubricating oil system for main propulsion turbines includes:


76. Thermal expansion valve will be trigger to open when there is a:


77. Magnet are installed in the main propulsion turbine lube oil strainers to attract metal particles released the wearing:


78. Vessel has been equipped with an oil lubricated stem bearing and is undergoing a routine drydocking, which of the following inspection should be maid when the tail shaft has been drawn?


79. Describe an oil lubricated stem tube bearing installations?


80. Represent operating characteristics of preparing for rubber stem tube bearings?


81. Great amount of water is prevented from entering a vessel using a water lubricated stern tube bearing by the use of:


82. Device use to retain the packing that keeps water from entering the ship through the opening where the propeller shaft passes through the bull:


83. What is the most probable cause of compressor short cycling on the low pressure side of a refrigeration system?


84. What occurred to the propeller tailshaft using bronze sleeve?


85. If there are dirty tubes in a condenser, what will be the condition of the refrigerating unit?


86. Sensing bulb of the thermostatic expansion valve is installed in what parts of refrigerating unit?


87. What is the indication of the engine displacement is equal to piston?


88. What is the condition when liquid reaches the compressor of a refrigeration system through the suction line?


89. Which regulates directly the suction side pressure of a refrigeration compressor, among the following components ?


90. If tonnage increased as the suction pressure is increased, horsepower will:


91. The temperature on a wet-bulb thermometer equals the dry-bulb temperature when:


92. If compression ratio and horsepower increases, tonnage:


93. Which refrigerant is the least flammable and the most toxic?


94. If an R-12 system has too much refrigerant, it will result to:


95. The refrigerant in the evaporator absorbs heat from air or brine because liquid refrigerant entering it:


96. In a Freon-12 compressor with a splash scoop lubrication system what causes the oil to foam?


97. A most desirable quality of Freon refrigerant is:


98. A bourdon-tube type steam pressure gauge is fitted with a siphon loop to prevent damage from:


99. Oil emulsification in engine lubricating oils will tend to:


100. The oil trap should be installed on refrigeration system:


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