1. What is an indication of the internal clearance of a hydraulic pump?
Answer
Correct Answer:
DIRT TOLERANCE
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2. What does the term mean when referring to the capacity of a filter?
Answer
Correct Answer:
Dirt
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3. What term refers to the weight of particles a strainer or filter will hold at the limit of its operation?
Answer
Correct Answer:
DIRT CAPACITY
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4. Where does the main function of a directional valve stop flow?
Answer
Correct Answer:
Through particular channels
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5. The main function of a directional valve is to prevent or direct what?
Answer
Correct Answer:
Flow
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6. What does the term direct current imply?
Answer
Correct Answer:
A steady level of electrical current
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7. What is the absolute difference between the inlet pressure and outlet pressure?
Answer
Correct Answer:
Differential pressure
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8. Paraffin wax is removed from which oils to improve their properties?
Answer
Correct Answer:
Lubricating oils
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9. Paraffin wax removal is known as what?
Answer
Correct Answer:
DE-WAXING
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10. What does DE-VENT mean?
Answer
Correct Answer:
To close the vent connection
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11. When closing a vent on a pressure control valve, it is called what?
Answer
Correct Answer:
DE-VENT
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12. What release process is used to unlock the detent?
Answer
Correct Answer:
A mechanical, hydraulic or electrical device
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13. What device maintains the spool of a hydraulic directional control valve in position?
Answer
Correct Answer:
Detent
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14. What is the term for the ability of an oil to separate from water?
Answer
Correct Answer:
EmULSIBILITY
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15. How does a hydraulic fluid resist mixing with water?
Answer
Correct Answer:
Emulsification
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16. What does the term "gpm" mean?
Answer
Correct Answer:
Gallons per minute
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17. What change in pressure causes an even release of energy in a system?
Answer
Correct Answer:
DECOMPRESSION
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18. Where does the change from elevated to lower pressure take place?
Answer
Correct Answer:
In a hydraulic system
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19. What is the removal of ragged edges from the inside diameter of a fitting or hose end called?
Answer
Correct Answer:
DEBURR
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20. What does the dead-weight accumulator increase and relieve pressure through the use of?
Answer
Correct Answer:
A weighted vertical piston
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21. What is a DEAD TIME?
Answer
Correct Answer:
A real, definite delay between two related actions
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22. In what units do we commonly express pump pressure?
Answer
Correct Answer:
PSI
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23. A single-acting cylinder has a single end that is what?
Answer
Correct Answer:
Closed
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24. When the shaft is retracted into the chamber, all the pistons or collars reach their closed end limits, what is applied to the shaft?
Answer
Correct Answer:
External weight
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25. When fluid flow is applied to a port in the closed end, what does the telescoping shaft extend until?
Answer
Correct Answer:
All collars or pistons
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26. What is the name of the hydraulic cylinder with a movable shaft at one end and a closed end at the other end?
Answer
Correct Answer:
Cylinder, Telescopic
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27. What type of cylinders is a TANDEM?
Answer
Correct Answer:
Two or more hydraulic cylinders
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28. What do the letters TANDEM mean?
Answer
Correct Answer:
Two or more hydraulic cylinders with interconnected piston assemblies
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29. A hydraulic cylinder that can only apply force to the moveable element in one direction is called what?
Answer
Correct Answer:
SINGLE-ACTING
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30. What can apply force to the moveable element only in one direction?
Answer
Correct Answer:
A hydraulic cylinder
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31. What is the name of the cylinder design that allows more than one cylinder to be used in a series?
Answer
Correct Answer:
REPHASING
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32. The CYLINDER; REPHASING design permits the use of two or more what?
Answer
Correct Answer:
Hydrulic cylinders
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33. What is the term used to describe a hydraulic cylinder in which the relative rotation of the cylinder housing and the piston and piston rod, plunger, or ram, is fixed?
Answer
Correct Answer:
CYLINDER, NON-ROTATING
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34. What is a non-rotating cylinder?
Answer
Correct Answer:
Hydraulic cylinder
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35. Where can a cylinder apply motion and force?
Answer
Correct Answer:
Either direction
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36. What type of cylinder is a double acting cylinder?
Answer
Correct Answer:
A hydraulic cylinder
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37. WHAT IS THE NAME OF THE DEVICE WHICH HOLDS THE CYLINDER CAPACITY FOR RETRACTION?
Answer
Correct Answer:
Hydraulic cylinder
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38. How many times can the cylinder be extended?
Answer
Correct Answer:
One full extension
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39. How many full extensions of the cylinder does the capacity of the cylinder capacity require?
Answer
Correct Answer:
Volume required for one full extension
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40. What is a cylinder cap?
Answer
Correct Answer:
A hydraulic cylinder end closure
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41. What mechanical device covers the entire bore area?
Answer
Correct Answer:
CYLINDER CAP
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42. What is an example of an adjustable stroke cylinder?
Answer
Correct Answer:
CYLINDER, ADJUSTABLE STROKE
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43. What are the stops at the end of the cylinder used to limit?
Answer
Correct Answer:
Piston travel
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44. What does the term "cylinder" mean in hydraulic engineering?
Answer
Correct Answer:
A hydraulic actuator constructed of a plunger or piston
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45. What does a cylinder convert fluid power into?
Answer
Correct Answer:
Linear mechanical force and motion
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46. What does "cycle-motion" refer to?
Answer
Correct Answer:
Movement from normal to extreme position and return
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47. What is it called to return from extreme position?
Answer
Correct Answer:
CYCLE-MOTION
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48. What do conductors do?
Answer
Correct Answer:
Transfer to electrical potential
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49. What are the conditions that a specimen is exposed to before testing?
Answer
Correct Answer:
Temperature, humidity
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50. What is the exposure of a device or specimen under specified conditions called?
Answer
Correct Answer:
CONDITIONING
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51. When pressure is reduced in a system, it is called what?
Answer
Correct Answer:
DECOMPRESSION
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52. What is the process of changing pressure from low to high called?
Answer
Correct Answer:
COMPRESSION
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53. What does the acronym CHS stand for?
Answer
Correct Answer:
Compressibility
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54. What kind of change in pressure is needed to change a unit of volume of a hydraulic fluid?
Answer
Correct Answer:
Unit change
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55. A "dead load" is what type of thing that needs to be balanced by a counterbalance valve?
Answer
Correct Answer:
Machine
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56. What is the valve used to balance the weight of a machine?
Answer
Correct Answer:
A counterbalance valve
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57. When does the application of CORROSION RESISTANCE occur?
Answer
Correct Answer:
Within the hydraulic components of a hydraulic system
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58. What is the term used to describe the ability of hydraulic fluids to resist corrosion?
Answer
Correct Answer:
CORROSION RESISTANCE
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59. What can CORROSION INHIBITOR prevent?
Answer
Correct Answer:
Chemical attack by water or other contaminants
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60. What does corrosion involve?
Answer
Correct Answer:
Degrades
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61. What is the process by which material degrades by chemical or electrochemical means?
Answer
Correct Answer:
Corrosion
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62. What is the function of a cooler?
Answer
Correct Answer:
To transfer heat
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63. What type of device does a Cooler function as?
Answer
Correct Answer:
Mechanical
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64. What can happen to a hose that is being flexed regularly?
Answer
Correct Answer:
CONTROLLED FLEXING
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65. What can valves also control?
Answer
Correct Answer:
Many pistons working with each other
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66. What are the three basic types of hydraulic control valves?
Answer
Correct Answer:
Tandem centre, open centre (motoring spool), and closed centre
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67. What are contaminants made up of?
Answer
Correct Answer:
Solid particles, liquids or gases
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68. What is the term for unwanted material that adversely affects the fluid power system or hydraulic components?
Answer
Correct Answer:
Contaminant
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69. What is a connector used for?
Answer
Correct Answer:
To attach two pieces of tubing together or to attach a piece of tubing to a connector
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70. What is the name of the device that is used to attach two pieces of tubing together?
Answer
Correct Answer:
Connector
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71. What is the name of the ability to connect coupling halves with internal pressure applied to either or both coupling halves?
Answer
Correct Answer:
CONNECT UNDER PRESSURE
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72. What are the hydraulic components called?
Answer
Correct Answer:
CONDUCTOR
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73. What are the parts of a hydraulic system that are called "conductor"?
Answer
Correct Answer:
The hydraulic components such as pipes, tubes, and hoses
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74. What is the ability to transfer to electrical potential?
Answer
Correct Answer:
CONDUCTIVE
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75. What are the specified conditions for conditioning?
Answer
Correct Answer:
Temperature, humidity
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76. What is a term used to describe the change in pressure in a hydraulic system from low pressure to elevated pressure?
Answer
Correct Answer:
COMPRESSION
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77. What does the word "compression" mean?
Answer
Correct Answer:
Change in volume of a unit of volume
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78. What is the change in volume of a unit of volume of a hydraulic fluid when subjected to a unit change of pressure?
Answer
Correct Answer:
COMPRESSIBILITY
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79. What does the gauge indicate at `zero psi'?
Answer
Correct Answer:
Level of pressure
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80. What type of gauge shows pressure at `zero’ psi?
Answer
Correct Answer:
COMPOUND GAUGE
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81. What is a component that can be used to make a single unit?
Answer
Correct Answer:
Hydraulic or electrical
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82. What is a single unit of hydraulic or electrical?
Answer
Correct Answer:
COMPONENT
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83. What are the two parts of a hydraulic coupling called?
Answer
Correct Answer:
Quick-action coupling halves
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84. What type of control alters displacement in response to pressure changes in the system?
Answer
Correct Answer:
COMPENSATOR
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85. What is it called when a variable pump or motor alters its displacement in response to pressure changes?
Answer
Correct Answer:
COMPENSATOR CONTROL
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86. What is an example of a COMMAND SIGNAL?
Answer
Correct Answer:
An external signal to which the servo must respond
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87. What type of signal is a COMMAND SIGNAL?
Answer
Correct Answer:
An external signal
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88. What must a servo respond to?
Answer
Correct Answer:
COMMAND SIGNAL
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89. Combustible liquid has what temperature?
Answer
Correct Answer:
+100 degrees F
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90. What kind of liquid has a flash point above 37.8 degrees C?
Answer
Correct Answer:
COMBUSTIBLE LIQUID
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91. How is a COLLAR typically compressed?
Answer
Correct Answer:
By swaging or crimping
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92. What is another term for collar?
Answer
Correct Answer:
Ferrule
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93. What does the term relative measure?
Answer
Correct Answer:
Surface lubricity
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94. What is a relative measure of the surface lubricity?
Answer
Correct Answer:
COEFFICIENT OF FRICTION
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95. A closed loop is a type of control that has what as its input?
Answer
Correct Answer:
An input signal
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96. What type of control has an input signal and a feedback of the result of the input signal?
Answer
Correct Answer:
Closed Loop
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97. When a piping arrangement is called a Closed Circuit, the pump output passes through what other components other than the pump?
Answer
Correct Answer:
Other hydraulic components
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98. What does the accumulator do?
Answer
Correct Answer:
Store the hydraulic oil under pressure
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99. Where is an accumulator used to store hydraulic oil under pressure?
Answer
Correct Answer:
Closed Centre Valves
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100. What does the pump operate against in a closed center circuit system?
Answer
Correct Answer:
A load
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101. What does a FLUTE mount with a common pin hole at?
Answer
Correct Answer:
Right angle or normal to the axis of symmetry
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102. What is the abbreviation for a "U" shaped mounting device?
Answer
Correct Answer:
CLEVIS
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103. What is the fourth position for a circuit, regen varic?
Answer
Correct Answer:
Incorporated into directional control valve
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104. What kind of unit controls a component?
Answer
Correct Answer:
Pilot
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105. What is used to control a main circuit or component?
Answer
Correct Answer:
CIRCUIT, PILOT
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106. What type of circuit is the return fluid being directed to?
Answer
Correct Answer:
Hydraulic
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107. What is the term for the circuit in which return fluid is directed to the reservoir?
Answer
Correct Answer:
CIRCUIT, OPEN
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108. What are circuits made up of?
Answer
Correct Answer:
Components, devices and passages
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109. What is the working set of logic for a particular application called?
Answer
Correct Answer:
Circuit
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110. What does a backflow prevent?
Answer
Correct Answer:
Flow in the opposite direction
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