問題一覧
1
1. relief valves are used in pneumatic system as damage prevented units 2. Check valves are using both hydraulic and pneumatic systems.
Both number 1 and number 2 or true
2
The component in the hydraulic system that is used to direct the flow of fluid is the
selector valve
3
A fully charged hydraulic accumulator provides
a source for additional hydraulic power when heavy demands are placed on the system.
4
Generally, the first step and removing an accumulator from an aircraft is to
Relief system pressure
5
An O-ring intended for use in a hydraulic system using MIL-H-5606 (mineral base) fluid will be marked with
a blue stripe or dot
6
A flexible, sealant element subject to motion is a
Packing
7
A hydraulic system referred to as a "power pack" system will
have all hydraulic power components located in one unit.
8
What device in a hydraulic system with a constant delivery pump allows circulation of the fluid when no demane are on the system?
Pressure regulator
9
The purpose of an orifice check valve is to
relieve pressure in one direction and prevent flow in the other direction
10
A filter incorporating specially treated cellulose paper is identified as a
micronic filter
11
What conditions would most likely cause excessive fluctuation of the pressure gauge when the hydraulic pump is operating?
inadequate supply of fluid
12
Which Illustration shows the correct spiral for Teflon backup rings
1 and 3
13
Select the valve used in a hydraulic system that directs pressurized fluid to one end of an activated cylinder and simultaneously is the right return fluid to the reservoir from the other end
Selector
14
What type of package should be used in hydraulic component to be installed in the system containing skydrol?
Packing materials made for ester base fluid
15
Which characteristics apply to aircraft hydraulic systems? 1. minimum maintenance requirements. 2. lightweight. 3. About 80% operated efficiency (20% loss due to fluid friction) 4. simple to inspect
1,2,4
16
The purpose of the pressure regulator in the hydraulic system is to
Maintain system operating pressure within a predetermined range and to unload the pump
17
What type of selective valve is one of the most commonly used in hydraulic system to provide for stimulus flow of fluid into and out of a connected actuating unit?
four Port, Closed Center valve
18
What function does the absolute pressure regulator perform in the pneumatic power system?
Regulate the Compressor in light air to provide a stabilized source of air for The compressor
19
Which fitting is an AN flared tube fitting
1
20
If a rigid tube is too short for the flare to reach its seat before tightening, pulling it into a place by tightening
May distort the flare
21
The installation of a new metal hydraulic line should be made with
enough bands to allow the tool to expand and contract with temperature changes and to absorb vibration
22
What is one advantage of hydraulic motors over electric motors
There is no fire hazard if the motor is stalled
23
Pneumatic system utilize
Relief valves
24
The removal of air from an aircraft hydraulic system is generally accomplished
By operating the various hydraulic component through several cycles
25
Relief valves are used in pneumatic systems
As damage preventing unit
26
What is the purpose of using back up rings with O-ring and hydraulic system above 1500 psi
Prevent high-pressure for extruding the seal between the moveing and stationary parts
27
A hydraulic hose identified as MIL-H-8794 will have a yellow stripe running the length of the hose. This stripe
identifies that the hose is constructed of synthetic rubber and may be suitable for a wide range of applications
28
To prevent external and internal leakage in aircraft hydraulic units, the most commonly used type of seal is the
O ring seal
29
If a Hydraulic brake system uses neoprene, rubber, packing materials, the correct hydraulic fluid to service The system is.
Mineral base oil
30
One of distinguishes characteristics of an open center selective valve using hydraulic system is that
Fluid flows through the valve in the off Position
31
An aircraft pneumatic system which incorporates an engine driven multi stage reciprocate, and compressor also requires
A moisture separator
32
To protect packing rings or seals from damage when it is necessary to install them over or inside threaded sections, the
threaded section should be covered with a suitable sleeve
33
Extraction of an o ring is prevented in a high-pressure system by the use of a
O ring on the side of the o ring away from the pressure
34
Which allow free fluid flow in One Direction and no fluid flow in the other direction
Check valve
35
The internal resistance of a fluid which tends to prevent it from flowing is called
viscosity