HYDRAULIC AND PNUEMATIC POWER SYSTEM

83問 • 1年前

問題一覧

A loud hammering noise in a hydraulic system having an accumulator usually indicates

To low or no preload in the accumulator

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

Both no. 1 and no. 2 are TRUE

The main system pressure relief valve in a simple hydraulic system equipped with a power control valve should be adjusted.

With the power control valve held in the Closed

Hydraulic accumulator is charge with an air preload of 1000 PSI. when a hydraulic system pressure of 3000 PSI is developed, the pressure on the air side of the accumulator will be

3000psi

Refer to Airframe (Figure No. 12) Which illustration (s) show (s) the correct spiral for teflon backup rings?

1 and 3

Refer to Airframe (Figure No. 11) Which fitting is an Airforce Navy (AN) flared tube fitting?

Which seals are with petroleum base hydraulic fluids?

Buna-N

What is one advantage of piston type hydraulic motors over electric motors?

There is no fire gazard if the motor is stalled.

An emergency supply of fluid is often retained in the main hydraulic system reservoir by the use of a standpipe. The supply line is connected to the

Inlet the main hydraulic system

In a hydraulic system that has a reservoir pressurized with turbine-engine compressor bleed air, which unit reduces the air pressure between the engine and reservoir.

Air pressure regulator

Quick-disconnect couplings in hydraulic system provide a means of

Quickly connecting and disconnecting hydraulic lines without loss of fluid or entrance of air in the system.

Components containing phosphate ester-based hydraulic fluid may be cleaned with

Stoddard solvent

Characteristics of MIL-H-5606

Red color, petrolde base will burn uses synthetic rubber seals

Some hydraulic system incorporate a device which is designed to remain open to allow a normal fluid flow in the line, but closed if the fluid flow increases above an established rate. This device is generally referred to as

Hydraulic fuse

A worn hydraulic pump shaft seal can normally be detected by

Hydraulic fluid flowing from the pump drain line

The internal resistance of fluid which tend to prevent it from flowing is called

Viscosity

Pressure is a term used to indicate the force per unit area. Pressure is usually expressed in

Pounds per square inch

Heat exchanger cooling units are required in some aircraft hydraulic system because of

High pressure and high rates of fluid flow

A unit which transforms hydraulic pressure which linear motions is called

An actuating cylinder

Which seal/material is ised with phosphate ester base hydraulic fluid?

Butyl Rubber

Petroleum base hydraulic fluid is which color?

Red

A flexible sealing element subject to motion is a

Packing

Chatter in a hydraulic system is cause by

Air in the system

Which is a characteristic of synthetic base hydraulic fluid?

High flash point

A hydraulic pump is a constant -displacement type if it

Delivers a uniform rate of fluid flow

How can the proper hydraulic fluid to be used in an airplane be determined?

Consult the aircraft manufacturer's service manual

The purpose of restrictors in the hydraulic system is to

Control the rate of movement of hydraulically operated mechanism

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

Selector valve

Seals used with a mineral base gudraulic fluid are identified by which color code?

Blue dot or stripe

Which valve installed in a hydraulic system will have the highest pressure setting?

Thermal relief valve

Although dents in the heel of a bend are not permissible, they are acceptable in the remainder of a hydraulic tube providing they are less than what percent of the tube damenter

What is the main purpose of a pressurized reservoir in a hydraulic system?

Prevent hydraulic pump cavitation

What functions does the absolute pressure regulator perform in the pneumatic power system?

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

The air that is expended and no longer needed when an actuating unit is operated in a pneumatic system is

Exhausted r dumped, usually overboard

Teflon hose that has developed a permanent set from being exposed to high pressure or temperature should

Not be straightened or bent further

One of the distinguishing characteristics of an open-center selector valve use in a hydraulic system is that

Fluid flow through the valve in the OFF Position

Using a hand pump pressure of 100 psi has been built up in a hydraulic system, the hand pump piston is 1 inch in diameter. A 1/2 inch line connects the hand pump to an actuating cylinder 2 inches in diameter. What is the pressure in the line between the hand pump and the actuator?

100 psi

An aircraft pneumatic system which incorporates an engine-driven multistage reciprocating compressor, also requires

A mositure separator

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.

Selector

Before removing the filler cap of a pressurized hydraulic reservoir, in order to service the system, you must

Relieve the air pressure

What types of selector valve is one of the most commonly used in hydraulic system to providing for simultaneous flow of fluid into and out of a connected actuating unit?

Four-port, closed-center valve

If hydraulic fluid is released when the air valve core of the accumulator is deressed, it is evidence

A ruptured diaphragm or leaking seals

What is the purpose of using backup rings with O-rings in hydraulic systems above 1500 psi?

Prevent high pressure from extruding the seal between the moving and stationary part

When hydraulic system pressure control and relief units fail to function properly. How are most systems protected against over pressure

A shear section on the main hydraulic pulp drive shaft

How many of these seals are used with petroleum base hydraulic fluids?

Neoprene, Buna-N

If a rigid tube is too short for the flare to reach its seat before tightening, pulling it into place by tightening

May distort the flare

Which of the following is adversely affected by atmospheric humidity if left unprotected?

Skydrol hydraulic fluid

Characteristics of MIL-H-8466 (skydrol 500 A & B) hydraulic fluids are

Light purple color, phosphate ester base, fire resistant, butyl rubber seals

Hydraulic fluid filtering elements constructed of pours papers are normally

Discarded at regular intervals and replaced with new filtering elements

Which seal/material is used with phosphate ester base hydraulic fluids?

Butyl rubber

A hydraulic motors convert fluid pressure to

Rotary motion

One of the main advance of skydrol is its

Wide operation temptation

A hydraulic system operational check during ground runup the wing flaps cannot be allowed using the main hydraulic system, but can be lowered by using the emergency likely cause

The fluid level in the reservoir is low

A pilot reports that when the hydraulic pump is running, the pressure is normal. However when pump is stopped no hydraulic pressure is available. This is an indication of a

Leaking accumulator air valve

Two types of hydraulic fluids currently being used in civil aircraft are

Mineral base and phosphate ester base

A characteristic of MIL-H-7644 hydraulic fluid are

Blue color, vegetable base, will burn, natural rubber seals

(1) materials which are skydrol compatible or resistant include most common aircraft metals and polyurethane and epoxy paints (2) skydrol hydraulic fluid is compatible with nylon and natural fibers regarding the above statements

Both no. 1 and no. 2 are TRUE

After installation of a rebuilt hydraulic hand pump. It is found that the handle cannot be moved in the pumping directions (pressure stroke). The most likely cause is an incorrectly installed

Hand pump outport check valve

How is the air in a hydraulic accumulator prevented fron entering the fluid system?

By physically separating the air chamber fron the oil with a flexible movable separation

If an aircraft's constant pressure hydraulic system and no more frequently than detected the most probable cause is

Low accumulator airpreload

Excluding lines , which components are required to make up a simple hydraulic system?

Pump, reservoir,selector valve, and actuator

What safety device is usually located between the driving unit and hydraulic pump drive shaft?

Pump drive coupling shear section

A crossflow valve which is designed to bypass fluid from one side of an actuating cylinder to the side, under certain conditions, may be found in some aircraft installed in the

Landing gear system

If a hydraulic brake system use neoprene rubber packing materials, the correct hydra fluid to service the system is

Mineral base oil

The primary purpose of a hydraulic actuating unit is to transform

Fluid pressure into useful work

Unloading valves are used with many engine-driven hydraulic pumps to

Relieve the pump pressure

Where can information be obtained about the compatibility of fire resistant hydraulic fluid with aircraft materials?

Fluid manufacturers technical bulletin

Phosphate ester base hydraulic fluid is very susceptible to contamination from

Water in the atmosphere

A common cause of slow actuation of hydraulic components is

Internal leakage in the actuating unit

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

Check valve

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

Check valve

What type of packings should be used in hydraulic components to be installed in a system containing skydrol?

Packing materials made for ester base fluids

In a gear-type hydraulic pump, a mechanical safety device incorporated to protect the pump fron overload is the

Shear pin

Most variable displacement aircraft hydraulic pumps in use.

Contain a built-in means of system pressure regulation

To prevent external and internal leakage in aircraft hydraulic units, the most commonly used type of seal is the

O-ring seal

Which must be done before adjusting the relief valve of a main hydraulic system incorporating a pressure regulator?

Eliminate the action of the unloading valve

Hydraulic pump system accumulating serve which of the following instructions?

dampen pressure surges, supplement the system pump when demand is beyond the pumps capacity,store power for limited operation components if the pump is not operating

If it is necessary to adjust several pressure regulating valves in a hydraulic system, what particular sequence, if any, should be followed?

Units with the highest pressure settings and adjusted first

Hydraulic fluid reservoirs are sometimes designed with a standpipe in one of the outlet ports in order to assure emergency supply of fluid. The outlet port with the standpipe in it furnishes fluid to the

Normal system power pump

Generally the first step in removing an accumulator from an aircraft is to

Relieve system pressure

Pneumatic systems utilize

Relief valves

Chattering of the hydraulic pump during operation is an indication

that air is entering the pump

Which valve installed in a hydraulic system will have the highest pressure setting?

Thermal relief valve

WOOD STRUCTURE

Jude Sibolinao · 16問 · 1年前

WOOD STRUCTURE

16問 • 1年前

Jude Sibolinao

ICE AND RAIN CONTROL SYSTEM

Jude Sibolinao · 28問 · 1年前

ICE AND RAIN CONTROL SYSTEM

28問 • 1年前

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FIRE PROTECTION SYSTEM

Jude Sibolinao · 30問 · 1年前

FIRE PROTECTION SYSTEM

30問 • 1年前

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AIRCRAFT ELECTRICAL SYSTEM

Jude Sibolinao · 21問 · 1年前

AIRCRAFT ELECTRICAL SYSTEM

21問 • 1年前

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AIRCRAFT FUEL SYSTEM

Jude Sibolinao · 70問 · 1年前

AIRCRAFT FUEL SYSTEM

70問 • 1年前

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問題一覧

A loud hammering noise in a hydraulic system having an accumulator usually indicates

To low or no preload in the accumulator

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

Both no. 1 and no. 2 are TRUE

The main system pressure relief valve in a simple hydraulic system equipped with a power control valve should be adjusted.

With the power control valve held in the Closed

Hydraulic accumulator is charge with an air preload of 1000 PSI. when a hydraulic system pressure of 3000 PSI is developed, the pressure on the air side of the accumulator will be

3000psi

Refer to Airframe (Figure No. 12) Which illustration (s) show (s) the correct spiral for teflon backup rings?

1 and 3

Refer to Airframe (Figure No. 11) Which fitting is an Airforce Navy (AN) flared tube fitting?

Which seals are with petroleum base hydraulic fluids?

Buna-N

What is one advantage of piston type hydraulic motors over electric motors?

There is no fire gazard if the motor is stalled.

An emergency supply of fluid is often retained in the main hydraulic system reservoir by the use of a standpipe. The supply line is connected to the

Inlet the main hydraulic system

In a hydraulic system that has a reservoir pressurized with turbine-engine compressor bleed air, which unit reduces the air pressure between the engine and reservoir.

Air pressure regulator

Quick-disconnect couplings in hydraulic system provide a means of

Quickly connecting and disconnecting hydraulic lines without loss of fluid or entrance of air in the system.

Components containing phosphate ester-based hydraulic fluid may be cleaned with

Stoddard solvent

Characteristics of MIL-H-5606

Red color, petrolde base will burn uses synthetic rubber seals

Hydraulic fuse

A worn hydraulic pump shaft seal can normally be detected by

Hydraulic fluid flowing from the pump drain line

The internal resistance of fluid which tend to prevent it from flowing is called

Viscosity

Pressure is a term used to indicate the force per unit area. Pressure is usually expressed in

Pounds per square inch

Heat exchanger cooling units are required in some aircraft hydraulic system because of

High pressure and high rates of fluid flow

A unit which transforms hydraulic pressure which linear motions is called

An actuating cylinder

Which seal/material is ised with phosphate ester base hydraulic fluid?

Butyl Rubber

Petroleum base hydraulic fluid is which color?

Red

A flexible sealing element subject to motion is a

Packing

Chatter in a hydraulic system is cause by

Air in the system

Which is a characteristic of synthetic base hydraulic fluid?

High flash point

A hydraulic pump is a constant -displacement type if it

Delivers a uniform rate of fluid flow

How can the proper hydraulic fluid to be used in an airplane be determined?

Consult the aircraft manufacturer's service manual

The purpose of restrictors in the hydraulic system is to

Control the rate of movement of hydraulically operated mechanism

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

Selector valve

Seals used with a mineral base gudraulic fluid are identified by which color code?

Blue dot or stripe

Which valve installed in a hydraulic system will have the highest pressure setting?

Thermal relief valve

Although dents in the heel of a bend are not permissible, they are acceptable in the remainder of a hydraulic tube providing they are less than what percent of the tube damenter

What is the main purpose of a pressurized reservoir in a hydraulic system?

Prevent hydraulic pump cavitation

What functions does the absolute pressure regulator perform in the pneumatic power system?

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

The air that is expended and no longer needed when an actuating unit is operated in a pneumatic system is

Exhausted r dumped, usually overboard

Teflon hose that has developed a permanent set from being exposed to high pressure or temperature should

Not be straightened or bent further

One of the distinguishing characteristics of an open-center selector valve use in a hydraulic system is that

Fluid flow through the valve in the OFF Position

100 psi

An aircraft pneumatic system which incorporates an engine-driven multistage reciprocating compressor, also requires

A mositure separator

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.

Selector

Before removing the filler cap of a pressurized hydraulic reservoir, in order to service the system, you must

Relieve the air pressure

What types of selector valve is one of the most commonly used in hydraulic system to providing for simultaneous flow of fluid into and out of a connected actuating unit?

Four-port, closed-center valve

If hydraulic fluid is released when the air valve core of the accumulator is deressed, it is evidence

A ruptured diaphragm or leaking seals

What is the purpose of using backup rings with O-rings in hydraulic systems above 1500 psi?

Prevent high pressure from extruding the seal between the moving and stationary part

When hydraulic system pressure control and relief units fail to function properly. How are most systems protected against over pressure

A shear section on the main hydraulic pulp drive shaft

How many of these seals are used with petroleum base hydraulic fluids?

Neoprene, Buna-N

If a rigid tube is too short for the flare to reach its seat before tightening, pulling it into place by tightening

May distort the flare

Which of the following is adversely affected by atmospheric humidity if left unprotected?

Skydrol hydraulic fluid

Characteristics of MIL-H-8466 (skydrol 500 A & B) hydraulic fluids are

Light purple color, phosphate ester base, fire resistant, butyl rubber seals

Hydraulic fluid filtering elements constructed of pours papers are normally

Discarded at regular intervals and replaced with new filtering elements

Which seal/material is used with phosphate ester base hydraulic fluids?

Butyl rubber

A hydraulic motors convert fluid pressure to

Rotary motion

One of the main advance of skydrol is its

Wide operation temptation

A hydraulic system operational check during ground runup the wing flaps cannot be allowed using the main hydraulic system, but can be lowered by using the emergency likely cause

The fluid level in the reservoir is low

A pilot reports that when the hydraulic pump is running, the pressure is normal. However when pump is stopped no hydraulic pressure is available. This is an indication of a

Leaking accumulator air valve

Two types of hydraulic fluids currently being used in civil aircraft are

Mineral base and phosphate ester base

A characteristic of MIL-H-7644 hydraulic fluid are

Blue color, vegetable base, will burn, natural rubber seals

Both no. 1 and no. 2 are TRUE

After installation of a rebuilt hydraulic hand pump. It is found that the handle cannot be moved in the pumping directions (pressure stroke). The most likely cause is an incorrectly installed

Hand pump outport check valve

How is the air in a hydraulic accumulator prevented fron entering the fluid system?

By physically separating the air chamber fron the oil with a flexible movable separation

If an aircraft's constant pressure hydraulic system and no more frequently than detected the most probable cause is

Low accumulator airpreload

Excluding lines , which components are required to make up a simple hydraulic system?

Pump, reservoir,selector valve, and actuator

What safety device is usually located between the driving unit and hydraulic pump drive shaft?

Pump drive coupling shear section

A crossflow valve which is designed to bypass fluid from one side of an actuating cylinder to the side, under certain conditions, may be found in some aircraft installed in the

Landing gear system

If a hydraulic brake system use neoprene rubber packing materials, the correct hydra fluid to service the system is

Mineral base oil

The primary purpose of a hydraulic actuating unit is to transform

Fluid pressure into useful work

Unloading valves are used with many engine-driven hydraulic pumps to

Relieve the pump pressure

Where can information be obtained about the compatibility of fire resistant hydraulic fluid with aircraft materials?

Fluid manufacturers technical bulletin

Phosphate ester base hydraulic fluid is very susceptible to contamination from

Water in the atmosphere

A common cause of slow actuation of hydraulic components is

Internal leakage in the actuating unit

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

Check valve

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

Check valve

What type of packings should be used in hydraulic components to be installed in a system containing skydrol?

Packing materials made for ester base fluids

In a gear-type hydraulic pump, a mechanical safety device incorporated to protect the pump fron overload is the

Shear pin

Most variable displacement aircraft hydraulic pumps in use.

Contain a built-in means of system pressure regulation

To prevent external and internal leakage in aircraft hydraulic units, the most commonly used type of seal is the

O-ring seal

Which must be done before adjusting the relief valve of a main hydraulic system incorporating a pressure regulator?

Eliminate the action of the unloading valve

Hydraulic pump system accumulating serve which of the following instructions?

dampen pressure surges, supplement the system pump when demand is beyond the pumps capacity,store power for limited operation components if the pump is not operating

If it is necessary to adjust several pressure regulating valves in a hydraulic system, what particular sequence, if any, should be followed?

Units with the highest pressure settings and adjusted first

Normal system power pump

Generally the first step in removing an accumulator from an aircraft is to

Relieve system pressure

Pneumatic systems utilize

Relief valves

Chattering of the hydraulic pump during operation is an indication

that air is entering the pump

Which valve installed in a hydraulic system will have the highest pressure setting?

Thermal relief valve