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 1 Hydraulic Symbols Components Controls Basic Circuits 1 611 16 18 2 7 12 17 19 3 20 8 13
Trouble Shooting 4 21 9 14 24
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 will all be the same.

7. 1
Which one of the following is the generalized symbol for a hydraulic pressure source?
CORRECT! a.
Category b.
WRONG! c. d. e.

8. 2
In the center position, a four port, three position, normally non-passing (closed center)
hydraulic valve has:
CORRECT!
a. P and T ports blocked
Category
b. P and A ports blocked
WRONG!
c. P, A, B, and T ports blocked
d. P to B ports blocked, and A and T ports connected
e. P blocked, and A, B, and T ports connected

9. CORRECT! WRONG! Which line in the simplified symbol shown3
Which line in the simplified symbol shown
indicates that the flow control valve has an
adjustable output?
CORRECT!
a. Arrow at an angle
Category
b. Reservoir symbol
WRONG!
c. Arrow on the flow line
d. Two arcs that form a narrow passage
e. Arrow on line that connects to flow line

10. 4
Which symbol part indicates that a hydraulic pump in the figure shown is bi-directional?
CORRECT!
a. Case drain
Category
b. One solid triangle
WRONG!
c. Two solid triangles
d. 45 degree line with arrow
e. The rotation arrow on the shaft

11. CORRECT! WRONG! Assuming no friction, what is the approximate5
Assuming no friction, what is the approximate
static pressure reading on the gauge in the
figure? (Both cylinders are full of oil.)
CORRECT!
a. 187 psi
4000 lb
Category
Static Load
1.5” Rod
1” Rod
WRONG!
b. 212 psi
c. 295 psi
d. 557 psi
Pres ?
e. 955 psi 3” 2”

12. 6
What size Schedule 40 pipe would flow 6 gpm with a velocity of about 3.8 ft/sec?
(Use formula Q=2.45vd ) 2
CORRECT!
a. 1/4 inch
Nom. Size (in)
O.D.
Average I.D.
Min. Wall
Nom. Wt./Ft.
Max. W.P. PSI
1/4"
0.54
0.344
0.088
0.086
780
3/8"
0.675
0.473
0.091
0.115
620
1/2"
0.84
0.602
0.109
0.17
600
3/4"
1.05
0.804
0.113
0.226
480
1"
1.315
1.029
0.133
0.333
450
Category
b. 3/8 inch
WRONG!
c.1/2 inch
d.3/4 inch
e. 1 inch

13. 7
Which one of the following valves uses both internal and external pilots to operate the valve spool?
CORRECT!
a. Brake
Category
b. Cross-port relief
WRONG!
c. Pressure relief
d. Sequence
e. Pressure reducing

14. 8
What condition determines if a pressure control valve has an external pilot drain?
CORRECT!
a. Pilot pressure
Category
b. Inlet pressure
WRONG!
c. Downstream back pressure
d. System pressure
e. Relief valve pressure

15. 9
Which one of the following is an advantage of a hydraulic direct acting pressure relief valve?
CORRECT!
a. Fast response
Category
b. Holds pump prime
WRONG!
c. Low pressure override
d. Low power loss at full flow
e. Pump flow diverted at high pressure

16. 10
If the load pressure on a pressure compensated flow control valve doubles, the pressure drop across the orifice will:
CORRECT!
a. Half
Category
b. Double
WRONG!
c. Quadruple
d. Reduce slightly
e. Remain the same

17. 11
Which one of the following is true for the pilot operated (to open) check valve shown?
CORRECT!
a. Fluid can flow only in one direction.
Category
b. Poppet piston is larger than pilot piston.
WRONG!
c. Fluid can be checked at the B-Port.
d. Pilot check valves have two ports.
e. Pilot pressure equals system pressure.

18. 12
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. Before the cylinder inlet port
Category
b. Between the cylinder and the PO check valve
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

19. 13
Approximately what minimum size motor would the pump described by the performance curves require to operate at 2000 psi?
CORRECT!
a. 90 hp
Category
b. 100 hp
WRONG!
c. 110 hp
d. 120 hp
e. 140 hp

20. 14
Which one of the following valves would be used to direct flow to the power steering and loader functions of a front end loader?
CORRECT!
a. By-pass flow regulator
Category
b. Priority flow divider
WRONG!
c. Proportional flow divider
d. Restrictor flow control
e. By-pass pressure relief

21. CORRECT! WRONG! A 2 gallon accumulator is precharged to15
A 2 gallon accumulator is precharged to
1500 psi. How much oil does the accumulator
hold when the system is at 2500 psi?
CORRECT!
a. 92 cu-in
Category
b. 128 cu-in
WRONG!
c. 184 cu-in
d. 278 cu-in
e. 462 cu-in

22. 16
Which of the following ladder diagram elements would consume the least current?
CORRECT!
a. Solenoid
Category
b. Relay coil
WRONG!
c. Signal lamp
d. Electric motor
e. Pressure switch

23. CORRECT! WRONG! Which electrical component protects a switch17
Which electrical component protects a switch
against arcing?
CORRECT!
a. Coil
Category
b. Capacitor
WRONG!
c. Relay contact
d. Pressure switch
e. Circuit breaker

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
b. P1 = Load 1 + P2
WRONG!
c. P2 = P1 + P3 - Load 1
d. P1 = P2 = P3
e. P3 = P1 - P2 + Load 1

25. 19
Which of the following valves must be externally drained?
CORRECT!
a. Sequence
Category
b. Relief
WRONG!
c. Brake
d. Pressure Reducing
e. None of the above

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
How do accumulator circuits that maintain system pressure differ from accumulator circuits that cushion loads?
CORRECT!
a. How the load is controlled
Category
b. Purpose of the check valve
WRONG!
c. How the accumulator is relieved
d. Placement of the pressure relief valve
e. Force exerted by the cylinder actuator

28. 22
Which type of circuit is used to synchronize the cylinders in the figure?
CORRECT!
a. Metered flow
Category
b. Replenishing
WRONG!
c. Flow divider
d. Equal loading
e. Series circuit

29. 23
A press cylinder with a 20 inch bore releases oil at the end of a 30 inch stroke through a decompression valve. If the oil is compressed 2%, how much oil could flow to return when the pressure is released?
CORRECT!
a. 18 cu-in
Category
b. 94 cu-in
WRONG!
c. 125 cu-in
d. 188 cu-in
e. 250 cu-in

30. 24
Jog starting a two-pump high-low pressure system after assembly causes the electric motor to stall. A circuit for the correct installation is shown. Which of the following could be at fault?
CORRECT!
a. Wrong electric motor rotation
Category
b. The check valve is installed backward
WRONG!
c. The pump to motor coupling is misaligned
d. The unloading valve return line is disconnected
e. The vent connection open on relief valve

31. 25
Which valve spool center should be used with a pilot operated check valve installed at the rod end of a double-acting cylinder?
CORRECT!
a. Tandem center
Category
b. Float center
WRONG!
c. Closed center
d. P to B, A to T
e. P to T, A to B