Game Tutorial How it works Brain Teasers This
Game Tutorial, How it works Brain Teasers This slide will populate automatically, no “clicking” required. 1 The headings are outcomes or categories for the questions. Sample figures are given to the left of this text which can bring you to sample slides. The numbered blocks represent the questions in one of the practice tests. 3 4 Pascal 5 Clicking on one of the numbered blocks will hyperlink you to that question. 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. 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. 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. 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. 1
IHT Pretest 2 Hydraulic Symbols Components Controls Basic Circuits 1 6 11 16 18 2 7 12 17 19 3 8 13 Trouble Shooting 20 4 9 14 24 21 Statics 10 15 25 22 5 23
Sample 1 What is the best answer describing the probable temperature of slush? a. None of the above b. 0 c. 32 d. 273 e. 492 f. All of the above CORRECT! WRONG!
Sample 3 In which month do middle school students talk the least? a. February b. April c. June d. August e. December CORRECT! WRONG!
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? a. Extend slowly b. Extend quickly c. Remain in place due to equal forces d. Retract slowly e. Oscillate CORRECT! WRONG!
Sample 5 Pascal found that pressure times area equals force (F = PA). Which cylinder pictured below could develop the greatest extending force? a. A b. B c. C d. D e. They would all be the same. A B C CORRECT! WRONG! D
1 How can a rotating shaft symbol be distinguished from a swivel connection? a. A rotary connection has one straight line. b. A swivel connection symbol has a closed arc. 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. CORRECT! WRONG!
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. AB a. b. P T AB c. d. P T AB e. P T AB P T CORRECT! WRONG!
3 What determines the pressure drop across the throttling orifice in the detailed symbol shown? a. Compensator bias spring force b. Load c. Throttling orifice d. Upstream pressure e. Downstream pressure CORRECT! WRONG!
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? a. 0. 12 psi b. 2. 04 psi c. 1. 47 psi d. 3. 86 psi e. 4. 71 psi CORRECT! WRONG!
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? a. 1131 psi b. 923 psi c. 565 psi d. 377 psi e. 754 psi CORRECT! WRONG!
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? a. 1. 75” b. 2. 83” c. 3. 42” d. 2. 72” e. 4. 00” CORRECT! WRONG!
7 Which one of the following circuit conditions would require using an external pilot to operate a counterbalance valve? a. Over center load b. Maximum tonnage c. Constant load d. Reverse flow capability e. Load holding capability CORRECT! WRONG!
8 Which one of the following valves is pilot operated from the outlet port and externally pilot drained? a. Braking b. Unloading c. Pressure reducing d. Counterbalance e. Pressure relief CORRECT! WRONG!
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 … a. Between the cylinder and the PO check valve b. Before the cylinder inlet port 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 CORRECT! WRONG!
10 Which one of the flow control valves will control the flow most accurately for all system conditions? a. Manual b. Pressure compensated c. Temperature compensated d. None of the above e. Pressure and temperature compensated CORRECT! WRONG!
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? a. Closed center b. Open center c. Float center d. Tandem center e. Through center CORRECT! WRONG!
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? a. 1200 psi b. 600 psi c. 2400 psi d. 4800 psi e. 1800 psi CORRECT! WRONG!
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? a. Valve spool 1 b. Valve spool 3 c. Valve spool 4 d. Valve spool 2 e. None CORRECT! WRONG!
14 A pre-charged empty accumulator receiving 5 gpm fills in 30 seconds. What is the approximate usable volume available from the accumulator? a. 19 cu-in b. 578 cu-in c. 347 cu-in d. 39 cu-in e. 1155 cu-in CORRECT! WRONG!
15 The normal position for a hydraulic cylinder is "retracted. " Which limit switch shown would energize the DC solenoid to retract the cylinder? a. Normally Closed b. Normally Open, Held Closed c. Normally Open d. Normally Closed, Held Open CORRECT! WRONG!
16 Positioning the meter in which position would allow you to read the voltage drop in the ladder diagram shown? a. A b. B c. C d. D e. None. (All the meters read the same. ) CORRECT! WRONG!
17 AC directional control valve solenoid hum can be reduced by … a. reducing solenoid inrush current. b. installing a solenoid with a shading coil. c. lowering solenoid line voltage. d. reducing solenoid shifting rate. e. reducing solenoid return spring force. CORRECT! WRONG!
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? a. P 3 = P 1 + P 2 - Load 1 b. P 1 = Load 1 + P 2 c. P 2 = P 1 + P 3 - Load 1 d. P 1 = P 2 = P 3 e. P 3 = P 1 - P 2 + Load 1 P 2 Load 2 P 3 CORRECT! WRONG! Load 3
19 Which component forces the circuit shown to regenerate flow? V 1 a. Check valve V 1 b. Pump c. Cylinder d. Check valve V 2 e. Control valve V 3 V 2 CORRECT! WRONG! V 3
20 Which of the following circuits provides a leakfree seal to hold a cylinder actuator in position? a. Brake b. Sequence c. Pilot operated check d. Unloading e. Pressure reducing CORRECT! WRONG!
21 Which one of the following is the most common location for a hydraulic filter? a. Return line b. Off-line c. Pressure line d. Inlet suction line e. Unloading relief valve line CORRECT! WRONG!
22 Which of the following will cause a sequence valve to fail to open? a. Open pilot drain line b. Weak bias spring c. High inlet port pressure d. High outlet port pressure e. Plugged drain line CORRECT! WRONG!
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? a. 5 hp b. 7. 5 hp c. 10 hp d. 15 hp e. 20 hp CORRECT! WRONG!
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? a. One to one cylinder b. Two to one cylinder c. Three to one cylinder d. Four to one cylinder e. Five to one cylinder CORRECT! WRONG!
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? a. The cross-over relief valves will open. b. The wheels will slip. c. The replenishing valves will open. d. The pressure relief valve will open. e. The pump will shift to neutral. CORRECT! WRONG!
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