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Chapter 13
End of Chapter Review Questions Answer Key
1. Which of the following best describes the operating principles of a truck wet-line kit?
2. Which of the following is a correct specification of atmospheric pressure at sea level?
3. Convert a manometer reading of 12 inches Hg into pounds per square inch (psi).
4. When two hydraulic cylinders in the same circuit are subjected to equal flow, which
of the following shouldbe true?
5. When there is a fixed restriction to flow in a hydraulic circuit, what should happen to
the pressure downstream from the restriction?
6. In an open-center hydraulic circuit, which of the following should be true when
describing pump operation?
7. When a hydraulic pump discharges the same slug volume it picks up per cycle, it
should be described as:
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8. How is hydraulic oil routed through a typical external-gear pump?
9. A vane-type hydraulic pump has one inlet port and one outlet port; it would be
classified as:
10. Which type of hydraulic pump would usually have higher operating efficiencies?
11. Which of the following is not a function of ahydraulic accumulator?
12. When applied to hydraulic flow in a circuit, what does the term laminar flow mean?
13. If a hydraulic pressure of 1,000 psi acts on a piston measuring 25 square inches, what
amount of linear force would result?
14. Which type of gear pump uses a crescent-shaped separator located between an
external spur gear and an annular internal gear?
15. Which of the following are used in an axial piston-type hydraulic pump?
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16. What specification(s) is normally used to rate hydraulic pump performance?
17. What is used to drive truck chassis hydraulic pumps?
18. Which of the following is the primary function of a flow-control valve?
19. What type of actuators would be required in the cab-lift hydraulics used on a COE
chassis?
20. What force is used to turn a hydraulic motor?
21. What type of hydraulic hose should be able to sustain the highest working pressures?
22. When comparing a section of 3/8-inch single-wire braid hydraulic hose to a 1/2-inch
single-wire braid, which of the following should be true?
23. Which of the following threads used in hydraulic fittings is described as dryseal?
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24. Which of the following should be true of a hydraulic fluid described as being of high
viscosity?
25. Which of the following symbols would be used to represent a pump in a hydraulic
schematic?