DIFFERENTIAL AND GEAR GROUP 2S0294 - Caterpillar

What's Your Answer? - Hydraulics
The correct answers can be found elsewhere in this issue.1. Which symbol represents a unidirectional, variable displacement pump?2. What two factors affect the amount of fluid pressure required to lift a load?a) Maximum fluid pressure and the area on which that pressure is exerted.b) Input force and the resulting fluid pressure.c) Input force and the area on which the input force is applied.d) Resisting force of load and the area on which fluid exerts pressure to support the load.3. The following symbol represents what type of valve?a) Nonadjustable relief valve.b) Adjustable relief valve.c) Pressure reducing valve.d) Flow divider valve.4. Hydraulic pump displacement is calculated by measuring which of the following?a) The volume of fluid pumped during one revolution of the pump.b) The average pressure during one revolution of the pump.c) The volume of fluid pumped in one minute.d.) None of the above.5. TRUE or FALSE: I.S.O. symbols make it easy to distinguish between the different types of pumps (gear, vane, piston).6. TRUE or FALSE: In a variable displacement piston pump, when the swashplate angle is increased, displacement is increased.7. TRUE or FALSE: A gear-type pump is classified as a variable displacement pump.8. TRUE or FALSE: Vane and piston-type pumps are always fixed displacement pumps.9. TRUE or FALSE: Hydraulic motors convert mechanical energy to into fluid energy.10. TRUE or FALSE: Vane type pumps will self compensate for wear.11. TRUE or FALSE: A charge pump supplies flow to the outlet of a larger pump to prevent cavitation.12. TRUE or FALSE: A simple relief valve is kept open during normal operation by a force exerted by the spring in the valve body.13. TRUE or FALSE: Compound or pilot operated valves are designed to enable the main valve to respond to short duration pressure surges.14. TRUE or FALSE: In a hydraulic system, valves have no control over pressure.15. Two types of control valves are:a) Positive and non-positiveb) Parallel and Seriesc) Open and Closed Centerd) None of the above16. How can fluid flow rate through a hydraulic system be reduced?a) Decrease cross-sectional area of all lines and hoses in the system.b) Increase pump output.c) Increase cross-sectional area of all lines and hoses in the system.d) Reduce fluid flow from the pump17. Pressure is usually measured in:a) Feet per second, meters per secondb) Gallons per minute, liters per minutec) Pounds per square inch, (kPa)d) Hose diameter18. Which valve maintains a set difference in pressure between lines or circuits?a) Flow divider valveb) Differential valvec) Make-up valved) Check valve19. Which valve limits system pressure by dumping full pump flow at a set pressure?a) Check valveb) Quick drop valvec) Relief valved) Pressure reducing valve20. Which valve will provide a predetermined maximum flow rate to one circuit and bypass excess flow to another circuit?a) Make-up valveb) Flow control valvec) Flow divider valved) Flow bypass valve21. Auxiliary pressure used to actuate or control hydraulic pressure is:a) Signal Pressureb) Pilot Pressurec) Cracking Pressured) System Pressure22. The pressure at which a pressure actuated valve begins to pass