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(Airframes)Hydraulics & Pneumatics(Airframes) > Homework - Hydraulic & Pneumatic Review & Pneumatic Review > Flashcards

Homework - Hydraulic & Pneumatic Review & Pneumatic Review Flashcards

1
Q

Pascal’s Law deals with measuring the amount of force that acts on a unit of area. The formula we use to express this is:

A

F=A x P

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2
Q

Volume is the amount of space a fluid occupies. The formula we use to express this is:

A

V=A x D

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3
Q

A gain in mechanical advantage is achieved using:

A

Different size pistons and constant pressure.

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4
Q

Viscosity is:

A

The internal resistance to flow.

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5
Q

The flash point is the temperature at which a liquid gives off vapor in sufficient quantity to ignite ___________ when a flame is applied.

A

momentarily

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6
Q

Vegetable based fluid is dyed ______ Seals used are ________________

A

Blue, Natural Rubber

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7
Q

Mineral based fluid is dyed ______ Seals used are _________________ or _______________

A

Red, Neoprene or Buna N

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8
Q

Phosphate-ester based fluid is dyed ______________ Seals used are ________________

A

Purple, Teflon

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9
Q

Skydrol hydraulic fluid:

A

Is susceptible to water contamination.

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10
Q

Mil-H-5606 fluid has a _____________base.

A

Mineral

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11
Q

Mil-H-8446 fluid has a ___________-______base. Trademarked as ____________________

A

Phosphate-Ester, Skydrol

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12
Q

Baffles and fins are sometimes installed in reservoirs to prevent ____________ and _____________ of the hydraulic fluid.

A

vortexing, surging

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13
Q

The Standpipe is for __________ use.

A

Normal

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14
Q

The integral reservoir _______ be easily removed.

A

Cannot

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15
Q

How do we prevent the empty space before the engine driven pump?

A

Bleed it

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16
Q

Pressurized reservoirs are typically found on:

A

Transport category aircraft.

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17
Q

The purpose of an aspirator is to:

A

Pressurize the reservoir.

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18
Q

Two other sources of pressurizing the reservoir are:

A

Bleed air, hydraulic system pressure.

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19
Q

Hydraulic pumps:

A

Move fluid through the system and create flow.

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20
Q

A pressure regulator, or unloading valve, must be used with a __________displacement hydraulic pump. Why is it called that? _______________________________________________________

A

Constant, maintain system operating pressure & unload the pumps.

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21
Q

Hydraulic fluid flowing through a gear-type pump moves ___________ the gears.

A

Around

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22
Q

What does a pump utilize if the gear seizes to prevent damage to engine gear box? _____________________________________________________________

A

Relief Valve

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23
Q

A flow control valve that allows flow in one direction but no flow in the opposite direction is a/an _________ valve.

A

Check

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24
Q

A flow control valve that allows flow in one direction but a restricted flow in the opposite direction is a/an _________ valve.

A

Restriction

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25
Q

A mechanically operated flow control valve that prevents fluid flowing to one unit before some other unit has actuated completely is called a/an __________ valve.

A

Sequence

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26
Q

A pressure-operated flow control valve that prevents fluid flowing to one unit until another unit has actuated and hydraulic pressure has built up to a value high enough to shift the valve is called a/an _________ valve.

A

Priority

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26
Q
A
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27
Q

A thermal relief valve is adjusted to relieve at a pressure ________ than that for which the main system pressure relief valve is adjusted.

A

Higher

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28
Q

Another name for a system pressure regulator is a/an/ __________ valve.

A

Unloading

29
Q

In order to store an incompressible fluid under pressure in a hydraulic system, a/an _____________ must be used.

A

Accumulator

30
Q

The initial pressure of nitrogen used in an accumulator is called the __________. Why would fluid come out the nitrogen port _________________________________________________

A

Schrader, Ruptured separator/seal

31
Q

What are three types of accumulators
1.______________
2.______________
3.______________

A
  1. Diaphragm 2. Bladder 3. Piston
32
Q

If preload was at 100 psi and system was pressurized to 600psi; what is the pressure on the air side? _____________

A

600

33
Q

If a hydraulic filter clogs, unfiltered fluid flows thru through the system through a __________ valve in the filter. The indicator is called __________

A

Bypass, Pressure Relieve Valve

34
Q

An open center selector valve is connected in __________.

A

Series

35
Q

A closed center selector valve is connected in _________.

A

Parallel

36
Q

Rotary, spool, and poppet valves:

A

Direct fluid to and from actuators.

37
Q

Shuttle valves automatically ________ fluid from two sources.

A

Direct

38
Q

Check valves allow flow in ______ direction(s) only.

A

One

39
Q

Orifice check valve or restrictor valve:

A

Allows free flow in one direction and restricts in the other

40
Q

Sequence valves:

A

Are used to properly sequence events

41
Q

Priority valves are ____________ actuated.

A

Hydraulically

42
Q

Hydraulic fuses:

A

Provide protection to our hydraulic system in case if electrical overload. Block the line in case of a major leak.

43
Q

A rotary actuator converts force from a _________ direction into a ___________ motion.

A

Linear, Rotary

44
Q

Gaskets are used in applications that _________ relative motion.

A

do not have

45
Q

Packing’s are seals that are used in applications that _________ relative motion.

A

Have

46
Q

A chevron seal is a ________ seal.

A

One-way

47
Q

An O-ring seal is a ___________ seal.

A

Two-Way

48
Q

If the pressure in an O-ring seal application exceeds 1500 psi:

A

The seal may extrude out of the groove.

49
Q

What color dot or stripe is on the packing for the following fluids? MIL-H-5606 O-Rings _____________ Skydrol (8446) O-Rings ____________ Fuel O-Rings ___________

A

Blue, Green, Red

50
Q

Actuators convert fluid pressure to ________.

A

Work

51
Q

High heat generated in the lines from pressure and high flow rates can be prevented with the use of ___________________________________

A

Heat Exchanger

52
Q

Why are quick disconnects used?

A

Minimize fluid loss. Prevent contamination

53
Q

A low-pressure pneumatic pump is typically used for:

A

Instrument air

54
Q

Engine bleed air used for _______________ pressure pneumatics typically fall in the range of ?

A

Medium , 100 to 150 psi

55
Q

High pressure pneumatics typically fall in the range of

A

1000 to 3000 psi

56
Q

The most important consideration in a full pneumatic system is removal of ___________.

A

Compressed Air

57
Q

Pneumatic systems utilize:

A

Check valves

58
Q

The most likely place one would expect to see a full pneumatic system is:

A

In a contemporary general aviation aircraft.

59
Q

Oil from the discharge of a wet-type air pump is collected by a/an ________________ and returned to the engine.

A

Collector

60
Q

The vanes of a dry-type air pump are made of ___________________.

A

Carbon

61
Q

The air pressure in a full pneumatic system is maintained in the correct range by the action of the ________________ valve.

A

Control

62
Q

Water is removed from the compressed air in a full pneumatic system by the ____________________________.

A

Vapor Separator

63
Q

Pneumatic systems utilize:

A

Relief valves

64
Q

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

A

Both statements are true

65
Q

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

A

Exhausted or dumped, usually overboard.

66
Q

Relief valves are used in pneumatic systems.

A

As a damage prevention units.

67
Q

Name two advantages of a pneumatic power system when compared with a hydraulic one.

A

Free and No return line

68
Q
  1. What type of linear actuator is this? ———————
    _____________________________________________
A

Single acting linear

69
Q
  1. What type of linear actuator is this? ———————
    _____________________________________________
A

Double-acting unbalanced

70
Q
  1. What type of linear actuator is this? ———————
    _____________________________________________
A

Double-Acting Balanced

(Airframes)Hydraulics & Pneumatics(Airframes) (12 decks)

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