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 1 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 will all be the same. A B C CORRECT! WRONG! D
1 Which one of the following is the generalized symbol for a hydraulic pressure source? a. b. c. d. e. CORRECT! WRONG!
2 In the center position, a four port, three position, normally non-passing (closed center) hydraulic valve has: a. P and T ports blocked b. P and A ports blocked 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 CORRECT! WRONG!
3 Which line in the simplified symbol shown indicates that the flow control valve has an adjustable output? a. Arrow at an angle b. Reservoir symbol c. Arrow on the flow line d. Two arcs that form a narrow passage e. Arrow on line that connects to flow line CORRECT! WRONG!
4 Which symbol part indicates that a hydraulic pump in the figure shown is bi-directional? a. Case drain b. One solid triangle c. Two solid triangles d. 45 degree line with arrow e. The rotation arrow on the shaft CORRECT! WRONG!
5 Assuming no friction, what is the approximate static pressure reading on the gauge in the figure? (Both cylinders are full of oil. ) a. 187 psi b. 212 psi 4000 lb 1. 5” Rod Static Load 1” Rod c. 295 psi d. 557 psi e. 955 psi Pres ? 3” 2” CORRECT! WRONG!
6 What size Schedule 40 pipe would flow 6 gpm with a velocity of about 3. 8 ft/sec? 2 (Use formula Q=2. 45 vd ) a. 1/4 inch CORRECT! WRONG! Nom. Size (in) O. D. c. 1/2 inch 1/4" 0. 54 0. 344 0. 088 0. 086 780 3/8" 0. 675 0. 473 0. 091 0. 115 620 d. 3/4 inch 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 b. 3/8 inch e. 1 inch Average Nom. Max. W. P. Min. Wall I. D. Wt. /Ft. PSI
7 Which one of the following valves uses both internal and external pilots to operate the valve spool? a. Brake b. Cross-port relief c. Pressure relief d. Sequence e. Pressure reducing CORRECT! WRONG!
8 What condition determines if a pressure control valve has an external pilot drain? a. Pilot pressure b. Inlet pressure c. Downstream back pressure d. System pressure e. Relief valve pressure CORRECT! WRONG!
9 Which one of the following is an advantage of a hydraulic direct acting pressure relief valve? a. Fast response b. Holds pump prime c. Low pressure override d. Low power loss at full flow e. Pump flow diverted at high pressure CORRECT! WRONG!
10 If the load pressure on a pressure compensated flow control valve doubles, the pressure drop across the orifice will: a. Half b. Double c. Quadruple d. Reduce slightly e. Remain the same CORRECT! WRONG!
11 Which one of the following is true for the pilot operated (to open) check valve shown? a. Fluid can flow only in one direction. b. Poppet piston is larger than pilot piston. c. Fluid can be checked at the B-Port. d. Pilot check valves have two ports. e. Pilot pressure equals system pressure. CORRECT! WRONG!
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? a. Before the cylinder inlet port b. Between the cylinder and the PO check valve 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!
13 Approximately what minimum size motor would the pump described by the performance curves require to operate at 2000 psi? a. 90 hp b. 100 hp c. 110 hp d. 120 hp e. 140 hp CORRECT! WRONG!
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? a. By-pass flow regulator b. Priority flow divider c. Proportional flow divider d. Restrictor flow control e. By-pass pressure relief CORRECT! WRONG!
15 A 2 gallon accumulator is precharged to 1500 psi. How much oil does the accumulator hold when the system is at 2500 psi? a. 92 cu-in b. 128 cu-in c. 184 cu-in d. 278 cu-in e. 462 cu-in CORRECT! WRONG!
16 Which of the following ladder diagram elements would consume the least current? a. Solenoid b. Relay coil c. Signal lamp d. Electric motor e. Pressure switch CORRECT! WRONG!
17 Which electrical component protects a switch against arcing? a. Coil b. Capacitor c. Relay contact d. Pressure switch e. Circuit breaker 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 CORRECT! WRONG!
19 Which of the following valves must be externally drained? a. Sequence b. Relief c. Brake d. Pressure Reducing e. None of the above CORRECT! WRONG!
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 How do accumulator circuits that maintain system pressure differ from accumulator circuits that cushion loads? a. How the load is controlled b. Purpose of the check valve c. How the accumulator is relieved d. Placement of the pressure relief valve e. Force exerted by the cylinder actuator CORRECT! WRONG!
22 Which type of circuit is used to synchronize the cylinders in the figure? a. Metered flow b. Replenishing c. Flow divider d. Equal loading e. Series circuit CORRECT! WRONG!
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? a. 18 cu-in b. 94 cu-in c. 125 cu-in d. 188 cu-in e. 250 cu-in CORRECT! WRONG!
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? a. Wrong electric motor rotation b. The check valve is installed backward c. The pump to motor coupling is misaligned d. The unloading valve return line is disconnected e. The vent connection open on relief valve CORRECT! WRONG!
25 Which valve spool center should be used with a pilot operated check valve installed at the rod end of a double-acting cylinder? a. Tandem center b. Float center c. Closed center d. P to B, A to T e. P to T, A to B CORRECT! WRONG!
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