Copyright Goodheart-Willcox Co., Inc.
154 Hydraulic Systems for Mobile Equipment
Review Questions
1. A double-acting, single-rod cylinder has
500 psi pressure applied simultaneously to
both the rod and cap side of the cylinder.
What will the result be?
A. The cylinder will retract.
B. The cylinder will be hydraulically locked.
C. The cylinder will extend.
D. Answer varies, depending on the type of
rod seal installed.
2. During the extension of an excavator’s boom,
stick, or bucket, which of the following will
occur?
A. The boom, stick, and bucket will exhibit
maximum force.
B. The boom, stick, and bucket are extended
by extending the cylinder.
C. The boom, stick, and bucket will exhibit
the slowest speed.
D. The boom, stick, and bucket will have
reduced force while the arms are
extending.
3. If a needle valve is used to actuate a
hydraulic cylinder with an overrunning load
in a “metering-out” mode, what will occur?
A. Cavitation.
B. Pressure intensification.
C. Both A and B.
D. Neither A nor B.
4. If a needle valve is used to meter oil into a
cylinder with an overrunning load, which of
the following could occur?
A. Cavitation.
B. Pressure intensification.
C. Both A and B.
D. Neither A nor B.
5. Which of the following cylinders would be
the best choice for a steering application?
A. Single-acting cylinder.
B. Double-acting, single-rod cylinder.
C. Telescoping cylinder.
D. Double-acting, double-rod cylinder.
6. If a cylinder pulls a load, what type of load is
it?
A. Tension.
B. Stress.
C. Thrust.
D. Inertia.
7. If a cylinder pushes a load, what type of load
is it?
A. Tension.
B. Stress.
C. Thrust.
D. Inertia.
8. Which of the following should be used to
remove a seized piston from a cylinder?
A. Acetylene torch with rosebud tip.
B. Compressed air.
C. Hydraulic hand pump.
D. Fluid from a running tractor.
9. Technician A states that it is okay to use
a lever to extend a frozen cylinder while
applying full system pressure to the cylinder.
Technician B states that it is okay to check for
cylinder leaks at mid-stroke by holding the
cylinder using a stop. Who is correct?
A. Technician A.
B. Technician B.
C. Both A and B.
D. Neither A nor B.
10. Which of the following terms refers to a
plunger blocking off a portion of a cylinder’s
flow at the end of its travel?
A. Main relief valve.
B. Rejuvenation.
C. Cushion.
D. Regeneration.
11. Which of the following terms refers to
routing the oil from the rod side of a
differential cylinder to the cap side?
A. Main relief valve.
B. Rejuvenation.
C. Cushion.
D. Regeneration.