A231 Q4

A hydraulic system referred to as a "power pack" system will

• a. have an engine-driven pump for greater pressure.

• b. have all hydraulic power components located in one unit.

• c. Have a pressurized reservoir.

(8382) A filter incorporating specially treated cellulose paper is identified as a

• a. sediment trap.

• b. cuno filter.

• c. micronic filter.

(8388) Which allows free fluid flow in one direction and no fluid flow in the other direction?

• a. Check valve.

• b. Metering piston.

• c. Shutoff valve.

(8389) Select the valve used in a hydraulic system that directs pressurized fluid to one end of an actuating cylinder and simultaneously directs return fluid to the reservoir from the other end.

• a. Sequence.

• b. Shuttle.

• c. Selector.

(8390) What function does the absolute pressure regulator perform in the pneumatic power system?

• a. Regulates the compressor outlet air pressure to stabilize the system pressure.

• b. Regulates the pneumatic system pressure to protect the moisture separator from internal explosion.

• c. Regulates the compressor inlet air to provide a stabilized source of air for the compressor.

6. (8391) 1- Relief valves are used in pneumatic systems as damage-preventing units. 2- Check valves are used in both hydraulic and pneumatic systems. Regarding the above statements,

• a. both No. 1 and No. 2 are true.

• b. neither No. 1 nor No. 2 is true.

• c. only No. 1 is true.

(8398) The component in the hydraulic system that is used to direct the flow of fluid is the

• a. check valve.

• b. orifice check valve.

• c. selector valve.

(8399) What type of selector valve is one of the most commonly used in hydraulic systems to provide for simultaneous flow of fluid into and out of a connected actuating unit?

• a. Four-port, closed-center valve.

• b. Three-port, four-way valve.

• c. Two-port, open-center valve.

(8401) The purpose of the pressure regulator in a hydraulic system is to

• a. maintain system operating pressure within a predetermined range and to unload the pump.

• b. regulate the amount of fluid flow to the actuating cylinders within the system.

• c. prevent failure of components or rupture of hydraulic lines under excessive pressure.

(8407) What is one advantage of piston-type hydraulic motors over electric motors?

• a. They are considerably quieter in operation.

• b. There is no fire hazard if the motor is stalled.

• c. They work satisfactorily over a wider temperature range.