Hydraulics 2

Question 1

To control a sequence of operations and to enable one unit to automatically set another unit into motion

Answer 1

purpose of a hydraulic sequence valve

Question 2

Are installed in one or both actuating cylinder working lines, depending on the type of action required.

Answer 2

Sequence valves

Question 3

Will go to the first unit

Answer 3

Direct line

Question 4

Goes to the second unit

Answer 4

Branchline

Question 5

Two types of sequence valves

Answer 5

Balanced and unbalanced

Question 6

Has a check valve with equal working areas which cannot be on seated by fluid pressure in either direction unless the plunger is depressed

Answer 6

Balanced sequence valve

Question 7

Can be understood by fluid pressure below it without having to pull and you’re depressed

Answer 7

Unbalanced sequence valve

Question 8

Most common cause of hydraulic system malfunction

Answer 8

Leakage of hydraulic fluid

Question 9

Cannot be visually seen making it difficult to locate

Symptom is sluggish or erratic operation of the unit

Answer 9

Internal leakage

Question 10

Can be seen is indicated by streaks or puddles of hydraulic fluid.
Symptom is slow movement of the unit with visible fluid loss

Answer 10

external leakage

Question 11

Fluid from spillage can be the cause of a violent explosion or fire if it comes in contact with pure oxygen

Answer 11

Hazard

Question 12

Sealing materials

Answer 12

Cork, leather, metal, and rubber

Question 13

Are used throughout aircraft hydraulic systems to minimize internal and external leakage

Answer 13

Seals

Question 14

2 classifications of seals

Answer 14

Gaskets and packings

Question 15

Is a seal used with stationary units; it experiences no relative motion between itself and the surface with which it is in contact
(Static seal)

Answer 15

Gasket

Question 16

Is a seal used with moving units; it experiences relative motion between itself and the surface with which it is in contact.
(Running or dynamic seal)

Answer 16

Packings

Question 17

2 types or synthetic rubber seals

Answer 17

Synthetic rubber and fabricated seal

Question 18

Do not deteriorate with age and tolerate temperatures in extreme of those found in high-pressure hydraulic systems
Diagonal cut (scarf cut) to aid in installation

Answer 18

Teflon

Question 19

Scrapes the piston rod clean as it is retracted into the unit

Answer 19

Metallic wipers

Question 20

Located behind the metallic wiper and their purpose is to lubricate the retracting piston rod after the ride has been scraped clean by the metallic wiper

Answer 20

Felt wipers

Question 21

What should not be used to cover danger areas or components.

Answer 21

Adhesive tape

Question 22

Fluid line identification

Answer 22

Bands of paint or strips of tape and metal tags

Question 23

Identified by the use of tape approximately 1 inch wide, on which words, colors, and geometric symbols are printed.

Answer 23

Identification of tape codes

Question 24

Flam
Toxic
Aahm
Phdan

Answer 24

Flammable, toxic and poisonous materials, anesthetic and harmful materials, and physically dangerous materials

Question 25

Used for high pressure, Most common types of tubing

Answer 25

Corrosion resistant steel tubing

Question 26

Used in half pressure and general purpose

Answer 26

Aluminum alloy tubing

Question 27

Used to connect moving parts with stationary parts and in location subject to severe vibrations

Answer 27

Flexible hoses