Welcome to our Online Hydraulics Quiz. The quiz below should be administered to all maintenance personnel responsible for hydraulic equipment. A score of less than 70% is a strong indication that GPM's Basic Hydraulic Troubleshooting workshop should be attended prior to our Machine-Specific Hydraulic Troubleshooting workshop to reap significant savings in unnecessary parts changing and plant downtime. *Name (required)*Geographic Area (required)*Email (required)Phone Number1. Pascal’s law states that pressure in a confined body of fluid will act_______________in all directions. A. erratically B. equally C. forward D. sequentially2. Pressure in a hydraulic system is generated by ___________ to flow. A. acceptance B. immunity C. resistance D. compliance3. Force = __________ x ____________ A. flow x distance B. work x time C. pressure x flow D. pressure x area4. Most of the energy not used to move the load in a hydraulic system turns into____________. A. heat B. light C. potential D. excrement5. The relief valve is a normally closed valve. The term “closed” means that in the power off condition the valve is: A. open to flow B. closed to flow C. adjustable D. non-adjustable6. When the compensator setting of a pressure compensating hydraulic pump is reached the pump volume will: A. dump back to tank through the relief valve B. dump back to tank through the compensator C. be reduced to only what the system needs D. be reduced until the pressure drops to near 07. What is the number one reason why pumps cavitate? A. low fluid level B. air leak in the suction line C. plugged suction strainer D. electric motor driving at an RPM that is too low8. What five characteristics does the valve below have? A. Normally open, 4-way, 2 position, detent, hydraulically actuated B. Normally open, two-way, three position, spring return, solenoid actuated C. Normally closed, two position, two-way, spring return, solenoid actuated D. Normally open, two position, two-way, spring return, hydraulically actuated9. Which valve center position would be best to use with a fixed displacement pump? A B C A B C D. All of the choices would work equally well10. Which of the valve actuators indicates a larger valve? A B A B C. Both valves are the same size D. Either valve could be larger11. The pressure reducing valve shown below is: A. normally open B. normally closed C. non-adjustable D. solenoid actuated12. What type gas should normally be used to charge an accumulator? A. Oxygen B. Compressed air C. Nitrogen D. Acetylene13. In precharging an accumulator used for volume, if there are no designer recommendations a good setting for most systems is A. the same as the compensator setting B. the same as the relief valve setting C. one half the maximum system pressure D. 10% above the maximum system pressure14. When using a hydraulic accumulator for volume and the accumulator is operating properly, heat should be felt: A. all over the accumulator shell B. in the lower 1/2-2/3 of the shell C. at the bottom of the shell only D. at the dump valve only15. When using an accumulator for shock it should be: A. installed as far as possible away from the component it protects B. pre-charged approximately 1000 PSI above the maximum system working pressure C. one gallon or smaller in size D. mounted horizontally16. The symbol shown below indicates: A. a remotely mounted flow control B. a fixed orifice flow control C. a pressure compensating, variable orifice flow control D. a temperature and pressure compensated variable flow control17. A purpose of the crossport relief valve in a hydraulic motor circuit is to: A. absorb shock when a hydraulic motor is first started B. heat up the hydraulic oil C. limit the maximum flow to the motor D. to serve as a back up in case the pump compensator fails18. Servo and proportional valves operate from a: A. fixed frequency anolog tone B. variable DC voltage or mA signal C. fixed DC voltage D. fixed AC voltage19. A servo valve should be nulled: A. with the signal cable connected B. with the maximum command signal applied C. with the signal cable disconnected D. with the hydraulic pump turned off20. The purpose of a Temposonic transducer is: A. to electronically indicate the cylinder position to the PLC B. to send a variable DC voltage to the servo valve coil C. to convert a fixed AC voltage to a variable DC voltage D. to cool the oil in the linear positioner21. When a problem exists with a linear positioner circuit, the first thing you would do is to: A. change the servo or proportional valve B. change the Temposonic transducer C. increase the system pressure D. drive the servo or proportional valve with a test box22. What is the most reliable indication of a faulty variable displacement hydraulic pump? A. Low system pressure B. Low oil temperature C. Excessive case drain flow D. A steady high-pitched whining sound23. What determines the speed of a hydraulic cylinder or a motor? A. System pressure B. Amount of oil flow C. Weight of the load D. Directional valve center position24. Which of the following applications would require a non bypassing type filter? A. Return line filter B. Downstream of any fixed displacement pump C. Upstream of a servo valve D. In a separate filtering and cooling circuit25. To prevent seal leakage, the case drain line of a hydraulic motor should: A. be connected to a system return line B. be plugged C. run directly back to the tank D. none of the abovePlease enter any comments you have about our quiz below. Once you click "Get My Score!" you will be shown your score and will receive an email with the answers you submitted and the correct answers to each of the questions.