Navedtra 14105 Fluid Power Chapter 11 And 12

Front 1

True or False. Pneumatic power is most commonly used in complex systems.

Back 1

True

Front 2

What characteristics are true for gases?

Back 2

they have no definite volume, no definite shape, and gases are lighter than equal volumes of liquids

Front 3

Absolute Zero in Celsius

Back 3

-273

Front 4

Absolute Zero in Fahrenheit

Back 4

-460

Front 5

Absolute zero in Kelvin and Rankine.

Back 5

0

Front 6

True or False. Absolute zero is the temperture at which no heat remains in a gas but not the lowest temperature obtainable, it was attained only once

Back 6

True

Front 7

True or False. Gases exert equal pressure on all surface areas of their containers.

Back 7

True

Front 8

When a reading is taken of the pressure in an automobile tire, what does the gauge reading represent?

Back 8

absolute pressure minus the local atmospheric pressure

Front 9

What is the absolute pressure (psia) in a cylinder that has a gauge reading of 1990 psig?

Back 9

2004.7

Front 10

What is the gauge pressure (psig) of a container that has an internal pressure of 113 psia?

Back 10

98.3

Front 11

True or False. Whenever you apply the gas laws, you must use absolute pressure.

Back 11

True

Front 12

When you observe that the pressure of gas in a sealed container has increased, you can assume that?

Back 12

heat has been absorbed by the gas

Front 13

Four cubic feet of nitrogen are under a pressure of 50 pisg. If the nitrogen is compressed to 2 cubic feet, what is the new gauge pressure?

Back 13

114.7

Front 14

A cylinder of gas at 75 degrres F has a pressure of 900 psig. To what maximum temperature may it be heated without exceeding 1000 psig?

Back 14

133.4 degrees F

Front 15

The general gas equation used in the study of gases is a combination of the gas laws of?

Back 15

charles and boyle

Front 16

Four cubic feet of a gas at 40 degree F has a gauge pressure of 100 psig. If the volume of the gas is expanded to 6 cubic feet and the gas heated to a temperature of 90 degrees F, what will the new gauge pressure be?

Back 16

69.4 psig

Front 17

In addition to being nonpoisonous and free from any acids that might cause system corrosion, the gas used as the fluid medium for a pneumatic system must possess what characteristics?

Back 17

nonflammability, chemical stability, ready availability

Front 18

The gases used in Navy pneumatic systems are similar to the liquids used in hydraulic systems, except that the gases are not?

Back 18

good lubricants

Front 19

What characteristic of compressed air makes it undesirable as a medium for pneumatic systems?

Back 19

its moisture content

Front 20

True or False. In all compressed air systems, the compressor, due to the unlimited supply of air, is installed in the distribution lines leading to the device to be operated.

Back 20

False

Front 21

True or False. The LP air system is supplied with LP air by LP air compressors. The LP air system is supplied with air by the HP air system supplying air through a pressure-reducing station.

Back 21

True

Front 22

Why is the use of nitrogen preferred over the use of compressed air in many aircraft and missile pneumatic systems?

Back 22

nitrogen cannot support living organisms, nitrogen cannot support combustion and fire, and nitrogen does not cause rust or decay of the surfaces with which it comes in contact.

Front 23

What steps can a maintenance person take to control contamination of pneumatic systems?

Back 23

keep all tools and the work air clean and dirt free and cap or plug all lines and fittings immediately after disconnecting them

Front 24

You must NEVER use the contents of a cylinder identified by what color codes for purging an oxygen system?

Back 24

one black stripe around its top

Front 25

True or False. In as much as compressed air is neither toxic nor flammable, the ordinary precautions for handling compressed gases do not apply to handling it.

Back 25

False

Front 26

True or False. In as much as nitrogen is nontoxic, the usual ventilation precautions need not be observed when nitrogen is used in confined spaces.

Back 26

False

Front 27

For a mechanic or technician, what aids are provided by diagrams?

Back 27

location of components within a system, location of general components, and understanding of how a system operates

Front 28

This diagram shows the internal parts of the components.

Back 28

cutaway

Front 29

This diagram shows the general location of components.

Back 29

pictoral

Front 30

This diagram uses symbols, shows actual appearance, and shows internal working part.

Back 30

Combination

Front 31

This type of diagram uses symbols to show components.

Back 31

graphic

Front 32

What diagrams include the interconnecting system piping?

Back 32

combination, pictorial, and graphic

Front 33

What diagram contains pipe sizes and data on the sequence of system operation?

Back 33

graphic

Front 34

A schematic diagram of a hydraulic system enables a mechanic to accomplish what tasks?

Back 34

understand the operation of the system, identify components of the system, and trace the flow of fluid through the system

Front 35

True or False. In an open-center hydraulic system the directional control valves are connected in parallel.

Back 35

True

Front 36

Why are closed-center hydraulic systems the most widely used systems?

Back 36

they operate very rapidly

Front 37

Hydraulic power drives are used in the Navy to perform what functions?

Back 37

drive and control winches, capstans, and windlasses, train and elevate nearly all calibers of guns, and position rocket and missile launchers

Front 38

The forward shaft of the prime mover drives what components?

Back 38

the hydraulic pump

Front 39

What type of auxilliary pump transmits a pulsing effect to the fluid in the response pressure?

Back 39

sump pump and oscillator

Front 40

What type of auxilliary pump replaces fluid in the active systems of the power drive?

Back 40

replenishing

Front 41

What functions does the reservoir provide?

Back 41

A reserve supply of fluid and a cooling surface for the fluid

Front 42

How is the tilting box positioned?

Back 42

locally by the stroke control shaft, automatically by the stroke control shaft, and mechanically by hand control

Front 43

The tilting box will not move under what conditions?

Back 43

IHP 500psi / HPC 1000 psi

Front 44

The direction and speed of the hydraulic motor are controlled by the?

Back 44

hydraulic pump

Front 45

What components are operated by nitrogen from the manually operated nitrogen bottle?

Back 45

dump valves, nose gear cylinder, and aft door cylinders

Front 46

What provides the force to reposition the shuttle valves for emergency operation?

Back 46

nitrogen

Front 47

When the emergency system is actuated, what force extends the main gear after the unlock hooks are released?

Back 47

gravity

Front 48

When the emergency system is actuated, what component is used in the system to prevent a fluid lock in the landing gear?

Back 48

dump valve