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.

MHM Pretest 1 Maintenance Field Repairs Shop Repairs Trouble Shooting 6 12 15 20 2 7 13 16 21 3 8 14 17 22 4 9 18 23 5 10 19 24 11 25

Sample 1 What is the best answer describing the probable temperature of slush? a. None of the above CORRECT! Category 1 - 10 b. 0 WRONG! c. 32 d. 273 e. 492 f. All of the above

Sample 3 In which month do middle school students talk the least? CORRECT! a. February Category 1 - 10 b. April WRONG! c. June d. August e. December

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 1 - 10 b. Extend quickly WRONG! c. Remain in place due to equal forces d. Retract slowly e. Oscillate

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 1 - 10 WRONG! b. B c. C d. D e. They will all be the same.

CORRECT! WRONG! The washer on the SAE O-ring fitting shown is used to: 1 The washer on the SAE O-ring fitting shown is used to: CORRECT! a. Lock the nut. Category 1 - 10 b. Compress the O-ring. WRONG! c. Seal the fitting. d. Position the fitting. e. Set the depth of the fitting.

CORRECT! WRONG! Cleaning the area around the hydraulic filter 2 Cleaning the area around the hydraulic filter when it is changed is done to: CORRECT! a. Inspect the assembly for leaks. Category 1 - 10 b. Keep the filter from running hot. WRONG! c. Prevent contamination from entering the system. d. Identify the replacement filter element. e. Meet manufacturers warranty requirements.

CORRECT! WRONG! Which part of the hose must be compatible with 3 Which part of the hose must be compatible with the fluid? CORRECT! a. Inner tube. Category 1 - 10 b. Covering. WRONG! c. Ply or braid. d. Friction layer. e. Wire reinforcement

CORRECT! WRONG! Which hose shown had a twist put in it during 4 Which hose shown had a twist put in it during installation? CORRECT! a. Category 1 - 10 WRONG! b. c. d. e.

CORRECT! WRONG! Which test would identify the presence of air in 5 Which test would identify the presence of air in a hydraulic oil? CORRECT! a. Feel test. Category 1 - 10 WRONG! b. Patch test. c. Crackle test. d. Laboratory analysis. e. Visual inspection.

CORRECT! WRONG! When warming up a hydraulic machine by 6 When warming up a hydraulic machine by stalling an actuator, the engine should be run at: CORRECT! a. Maximum Governor Speed Category 1 - 10 b. Normal Operating RPM WRONG! c. Mid Range RPM d. Fast Idle e. Slow Idle

CORRECT! WRONG! Which one of the following will damage the rod seal? 7 Which one of the following will damage the rod seal? CORRECT! a. Rod burr. Category 1 - 10 b. Low oil level. WRONG! c. Low pressure. d. Stalled cylinder. e. Loose cylinder mount.

CORRECT! WRONG! A hydraulic cylinder Chevron V-packing is 8 A hydraulic cylinder Chevron V-packing is lubricated by: CORRECT! a. Port lubrication. Category 1 - 10 b. Graphite packing. WRONG! c. Controlled leakage. d. Rotating cylinder rod. e. Increased system pressure.

CORRECT! WRONG! At how many places does a 37˚ JIC tube 9 At how many places does a 37˚ JIC tube connection seal? CORRECT! a. 1 Category 1 - 10 b. 2 WRONG! c. 3 d. 4 e. 5

CORRECT! WRONG! If a cylinder rod eye seizes at the pin for lack of 10 If a cylinder rod eye seizes at the pin for lack of lubrication, continued operation can: CORRECT! a. Cause the system to over heat. Category 1 - 10 b. Cause the rod seal to leak. WRONG! c. Reduce operating speed. d. Overload the cylinder. e. Bend the rod.

11 Which one of the following would indicate the presence of water in a petroleum base hydraulic oil? CORRECT! a. Oil turns dark color. Category 1 - 10 b. Control valve seizes. WRONG! c. Oil has a hazy appearance. d. Pump becomes noisy. e. Jerky cylinder operation.

CORRECT! WRONG! If a 1 inch 100R1 hydraulic hose with an outside 12 If a 1 inch 100R1 hydraulic hose with an outside diameter 1-1/2 inches has a minimum bend radius of 12 inches, what is the distance between the outside of a hose with a 180˚ bend? CORRECT! a. 12” Category 1 - 10 WRONG! b. 15” c. 18” e. 21” d. 27”

CORRECT! WRONG! Which one of the following has the most affect 13 Which one of the following has the most affect on the dielectric strength of non-conductive hose? CORRECT! a. Pressure. Category 1 - 10 b. Temperature. WRONG! c. Flow velocity. d. Moisture content in the hose. e. Size of the hose.

CORRECT! WRONG! In the figure shown, which one of the following 14 In the figure shown, which one of the following could cause a hose to fail? b. c.. d. e. CORRECT! a. Tractor hose connections reversed. Category 1 - 10 b. Cylinder mounting reversed. WRONG! c. Cylinder hose connections reversed d. Directional control valve connections reversed. e. Any one of the above would cause the hose to fail.

15 Which one of the following would let the mechanic know that a new pump installation was operating properly? CORRECT! a. No leaks at any of the fittings. Category 1 - 10 b. Proper rotation of the pump shaft. WRONG! c. Pressure reading at the outlet. d. No vibration at the drive coupling. e. Cavitation at the inlet.

CORRECT! WRONG! Which one of the following is an important step 16 Which one of the following is an important step in the recommended procedure when draining the fluid and flushing a hydraulic system? CORRECT! a. Remove the pump. Category 1 - 10 b. Drain the fluid cold. WRONG! c. Drain each major component. d. Reverse the pump to back flush the system e. Warm up the fluid.

CORRECT! WRONG! A hydraulic motor is leaking at the shaft seal 17 A hydraulic motor is leaking at the shaft seal when the motor is operated. What should be done next? CORRECT! a. Replace the seal. Category 1 - 10 b. Determine if there is excessive slippage in the motor. WRONG! c. Change the pump. d. Replace the motor. e. See if the operation is the same in reverse.

CORRECT! WRONG! Why is the pressure setting of a new pressure 18 Why is the pressure setting of a new pressure relief valve reduced when it is installed in a hydraulic system with a fixed displacement pump? CORRECT! a. To warm up the fluid. Category 1 - 10 b. To protect the system. WRONG! c. To break the valve in. d. To relieve trapped air. e. To set the relief valve spring.

CORRECT! WRONG! The tractor implement shown raises and lowers 19 The tractor implement shown raises and lowers slower than it should. What kind of a problem is this? CORRECT! a. Flow. Category 1 - 10 b. Heat. WRONG! c. Leakage. d. Pressure. e. Vibration.

CORRECT! WRONG! Which one of the following would lengthen cycle 20 Which one of the following would lengthen cycle times on a loaded backhoe? CORRECT! a. Fast operator. Category 1 - 10 b. Cold machine. WRONG! c. Worn pump. d. Clogged return line filter. e. Pressure control set too high.

CORRECT! WRONG! Why would a counterbalance valve be non-adjustable? 21 Why would a counterbalance valve be non-adjustable? CORRECT! a. Prevent valve adjustment. Category 1 - 10 b. Valve is pressure balanced. WRONG! c. Pressure is adjusted by second pilot. d. Internal drain prevents valve adjustment. e. Spring adjustment would interfere with check valve.

CORRECT! WRONG! If an outrigger cylinder like that shown leaks off 22 If an outrigger cylinder like that shown leaks off and lowers the truck to the ground, and the manual shut off valves are open, you should expect to find a: CORRECT! a. Pressure line leak. Category 1 - 10 b. Rod seal leak. WRONG! c. Rod end check valve seat leak. d. Control valve spool bypass leak. e. Cap end check valve seat leak.

CORRECT! WRONG! A bucket truck with a hydraulic lift aerates the 23 A bucket truck with a hydraulic lift aerates the fluid. If the fluid level is okay, what should the mechanic check next? CORRECT! a. Inlet strainer. Category 1 - 10 b. Pump outlet line. WRONG! c. Relief valve pressure. d. Pump inlet line. e. Boom cylinder rod seal.

CORRECT! WRONG! When pressure testing a fixed displacement 24 When pressure testing a fixed displacement pump that is not defective, what might be expected to happen as the outlet is restricted? CORRECT! a. Pump will cavitate. Category 1 - 10 b. Pump pressure will increase WRONG! c. Pump pressure will decrease. d. Pump flow will increase. e. Pump flow will decrease significantly

25 “Rod cocking” from misalignment or over-extension can cause the cylinder rod to: b. c. d. e. CORRECT! a. Become dented. Category 1 - 10 b. Gall. WRONG! c. Seize. d. Chatter. e. Stretch.