1. Game Tutorial, How it works
Brain Teasers
This slide will populate automatically, no “clicking” required.
Sample figures are given to the left of this text which can bring you to sample slides. 1
The headings are outcomes or categories for the questions.
The numbered blocks represent the questions in one of the practice tests.
Clicking on one of the numbered blocks will hyperlink you to that question. 3
When the question slide opens, you will have three seconds before the 30 second timer starts. The timer is an extending cylinder heading toward a limit switch. 4
Click on the letter for what you think is the right answer. The slide will respond to let you know if you have chosen the correct answer.
If you choose incorrectly, the chosen answer will disappear leaving you with fewer choices.
Pascal
To return to the selection page, click on the “Limit Switch” icon. You will jump back to the selection page and the previously selected choice will disappear. 5
Try clicking on one of the numbered blocks to activate this tutorial.
Repeat the steps until all the questions have been reviewed.
Click on the “Limit Switch” anytime to begin the actual Game.

2. IHT Pretest 2 Hydraulic Symbols Components Controls Basic Circuits 1 611 16 18 2 7 12 17 19 3 8 13
Trouble Shooting 20 4 24 21 9 14
Statics 10 15 25 22 5 23

3. Sample 1
What is the best answer describing the probable temperature of slush?
a. None of the above
CORRECT!
Category
b. 0
WRONG!
c. 32
d. 273
e. 492
f. All of the above

4. Sample 3
In which month do middle school students talk the least?
CORRECT!
a. February
Category
b. April
WRONG!
c. June
d. August
e. December

5. Sample 4
The 2:1 cylinder pictured below is open to atmosphere (14.7 psia) at each end. Assuming no load, what would you expect the cylinder to do?
CORRECT!
a. Extend slowly
Category
b. Extend quickly
WRONG!
c. Remain in place due to equal forces
d. Retract slowly
e. Oscillate

6. Sample 5
Pascal found that pressure times area equals force (F = PA). Which cylinder pictured below could develop the greatest extending force?
CORRECT!
a. A A B C D
Category
WRONG!
b. B
c. C
d. D
e. They would all be the same.

7. 1
How can a rotating shaft symbol be distinguished from a swivel connection?
CORRECT!
a. A rotary connection has one straight line.
Category
b. A swivel connection symbol has a closed arc.
WRONG!
c. A shaft connection symbol has two arrows.
d. A swivel connection symbol has one arrow.
e. A shaft connection symbol has a closed arc.

8. 2
Which hydraulic three-position directional control valve center position would provide the safest operation for a pressure compensated pump system that controls an aerial truck boom? A counter balance valve adjusted to control the load is manifold mounted to the cylinder. A B P T
CORRECT! a. A B P T
Category b.
WRONG! A B P T c. A B P T d. A B P T e.

9. 3
What determines the pressure drop across the throttling orifice in the detailed symbol shown?
CORRECT!
a. Compensator bias spring force
Category
b. Load
WRONG!
c. Throttling orifice
d. Upstream pressure
e. Downstream pressure

10. 4
What is the gauge pressure at the inlet of a pump mounted 4 feet below the surface of a hydraulic fluid that has a specific gravity of 0.85?
CORRECT!
a psi
Category
b psi
WRONG!
c psi
d psi
e psi

11. 5
A 3 inch bore horizontally mounted hydraulic cylinder with a 1-1/2 inch diameter rod supports a tractive force of 2 tons at mid-stroke. What is the pressure in the rod end of the cylinder?
CORRECT!
a psi
Category
WRONG!
b. 923 psi
c. 565 psi
d. 377 psi
e. 754 psi

12. 6
A hydraulic ram with a 3 inch bore operates at a relief valve pressure of 2000 psi. If the ram must exert a retraction force of 2500 lb, what is the maximum diameter of the rod?
CORRECT!
a. 1.75”
Category
b. 2.83”
WRONG!
c. 3.42”
d. 2.72”
e. 4.00”

13. 7
Which one of the following circuit conditions would require using an external pilot to operate a counterbalance valve?
CORRECT!
a. Over center load
Category
b. Maximum tonnage
WRONG!
c. Constant load
d. Reverse flow capability
e. Load holding capability

14. 8
Which one of the following valves is pilot operated from the outlet port and externally pilot drained?
CORRECT!
a. Braking
Category
b. Unloading
WRONG!
c. Pressure reducing
d. Counterbalance
e. Pressure relief

15. 9
The best place to install a flow control valve to smooth out the operation of a pilot operated check valve as it lowers a load is …
CORRECT!
a. Between the cylinder and the PO check valve
Category
b. Before the cylinder inlet port
WRONG!
c. At the PO check valve drain port
d. At the PO check valve pilot port
e. Between the PO check valve and the DCV valve

16. 10
Which one of the flow control valves will control the flow most accurately for all system conditions?
CORRECT!
a. Manual
Category
b. Pressure compensated
WRONG!
c. Temperature compensated
d. None of the above
e. Pressure and temperature compensated

17. 11
Which valve spool center is required for a cylinder circuit with a pilot operated check valve when used in combination with a fixed displacement pump and accumulator in the system?
CORRECT!
a. Closed center
Category
b. Open center
WRONG!
c. Float center
d. Tandem center
e. Through center

18. 12
The pressure holding a pilot operated to-open check valve with a 4:1 ratio in the closed position is 2400 psi. What minimum pilot pressure would open the valve?
CORRECT!
a psi
Category
b. 600 psi
WRONG!
c psi
d psi
e psi

19. 13
Which valve spool from the graph shown would provide a flow rate of 10 gpm and still keep the pressure drop in the 50 psi to 60 psi range?
CORRECT!
a. Valve spool 1
Category
b. Valve spool 3
WRONG!
c. Valve spool 4
d. Valve spool 2
e. None

20. 14
A pre-charged empty accumulator receiving 5 gpm fills in 30 seconds. What is the approximate usable volume available from the accumulator?
CORRECT!
a. 19 cu-in
Category
b. 578 cu-in
WRONG!
c. 347 cu-in
d. 39 cu-in
e cu-in

21. 15
The normal position for a hydraulic cylinder is "retracted."
Which limit switch shown would energize the DC solenoid to retract the cylinder?
CORRECT!
a. Normally Closed
Category
WRONG!
b. Normally Open, Held Closed
c. Normally Open
d. Normally Closed, Held Open

22. 16
Positioning the meter in which position would allow you to read the voltage drop in the ladder diagram shown?
CORRECT!
a. A
Category
b. B
WRONG!
c. C
d. D
e. None. (All the meters read the same.)

23. 17
AC directional control valve solenoid hum can be reduced by …
CORRECT!
a. reducing solenoid inrush current.
Category
b. installing a solenoid with a shading coil.
WRONG!
c. lowering solenoid line voltage.
d. reducing solenoid shifting rate.
e. reducing solenoid return spring force.

24. 18
In a series hydraulic circuit like that in the figure shown, with equal bore and rod diameter double-rod cylinders holding equal loads at mid-stroke, which of the following is true?
CORRECT!
a. P3 = P1 + P2 - Load 1
Category
Load 1
Load 2
Load 3
b. P1 = Load 1 + P2
WRONG! P2 P3
c. P2 = P1 + P3 - Load 1 P1
d. P1 = P2 = P3
e. P3 = P1 - P2 + Load 1

25. 19
Which component forces the circuit shown to regenerate flow? V1 V2
CORRECT!
a. Check valve V1 V3
Category
b. Pump
WRONG!
c. Cylinder
d. Check valve V2
e. Control valve V3

26. 20
Which of the following circuits provides a leak-free seal to hold a cylinder actuator in position?
CORRECT!
a. Brake
Category
b. Sequence
WRONG!
c. Pilot operated check
d. Unloading
e. Pressure reducing

27. 21
Which one of the following is the most common location for a hydraulic filter?
CORRECT!
a. Return line
Category
b. Off-line
WRONG!
c. Pressure line
d. Inlet suction line
e. Unloading relief valve line

28. 22
Which of the following will cause a sequence valve to fail to open?
CORRECT!
a. Open pilot drain line
Category
b. Weak bias spring
WRONG!
c. High inlet port pressure
d. High outlet port pressure
e. Plugged drain line

29. 23
What is the minimum size motor needed to power a hi-low pump system that has a 24 gpm high volume low-pressure pump set to unload at 500 psi, and a 4 gpm low-volume high pressure pump if the main system relief is set at 3000 psi?
CORRECT!
a. 5 hp
Category
b. 7.5 hp
WRONG!
c. 10 hp
d. 15 hp
e. 20 hp

30. 24
Which of the following types of cylinders would most likely drift out under no load, if the open center valve were under back pressure?
CORRECT!
a. One to one cylinder
Category
b. Two to one cylinder
WRONG!
c. Three to one cylinder
d. Four to one cylinder
e. Five to one cylinder

31. 25
The hydrostatic transmission circuit shown powers the drive wheels on a lawn mower. Which of the following will occur if the mower meets an immovable object, such as a tree, under full power?
CORRECT!
a. The cross-over relief valves will open.
Category
b. The wheels will slip.
WRONG!
c. The replenishing valves will open.
d. The pressure relief valve will open.
e. The pump will shift to neutral.