Fluid Lines and Fittings Practice Test

These questions are part of the practice quiz. Start practicing

• What is a common pressure rating range for hydraulic hoses?
• How does a 3/8 inch aircraft high-pressure flexible hose compare to 3/8 inch metal tubing in the same system?
• What precaution should be observed during the deburring process?
• If a tube cutter is not available, use a ________.
• What should be avoided to prevent reducing the flare thickness during installation?
• What element is important to check for in flexible hoses to prevent malfunction?
• How does temperature affect hydraulic fluid?
• Metal tubing fluid lines are sized by what criteria?
• A new piece of tubing should be cut approximately ________% longer than the tube to be replaced.
• What is a common failure mode in hydraulic hoses?
• Which of the following is a common cause for leakages in tubing?
• What ensures a proper seal in threaded hydraulic connections?
• What should be done if a flareless tube nut is over-tightened?
• What do lay lines and identification markings consist of?
• Are color codes and words used in the identification of fluid lines?
• When connecting a straight hose assembly, the minimum hose length should be calculated as:
• Never use an ________ flaring tool which produces a flare of 45 degrees.
• What materials are hose materials commonly made from?
• Can flexible hoses be used in high-pressure applications?
• What is the consequence of inadequate support for fluid lines?
• What is the maximum recommended tightening of the clamp during a flare assembly to ensure safety?
• What should the wall thickness be at the end of the tubing after deburring?
• What is a swivel fitting used for?
• What is the primary purpose of fluid fittings in hydraulic systems?
• What inspection should be conducted after the assembly of a flexible hose?
• What is the primary purpose of providing suitable bends in fluid and pneumatic metal tubing runs?
• What is the standard identification number for an AN union standard fitting?
• What must be checked when replacing rigid tubing?
• What is the best tool to cut aluminum tubing or tubing of moderately soft metal?
• What is the impact of using mismatched connectors?
• What is the purpose of using a flare tool?
• Which step follows placing the tube in the flaring block when making a single flare?
• Which material is prohibited in the construction of flexible fluid lines?
• When might it be permissible to disconnect hydraulic lines?
• Which of the following does NOT classify flexible hoses?
• Which environmental factors can cause damage to hydraulic hoses?
• The term "cold flow" is generally associated with which material?
• Metal tubing size is determined by the ________ and is measured fractionally in ________ of an inch.
• What must be verified before installing new tubing?
• What does the dash number associated with hose signify?
• What material is commonly used for making rigid fluid lines?
• What does “ID” refer to in hose specifications?
• Can MS flareless fittings be used on aircraft?
• What condition may occur to a Teflon hose that has been in service for some time?
• What is the maximum allowable depth for scratches or nicks on aluminum alloy tubing?
• What should be routinely checked on hydraulic hoses?
• What does the term “bursting” of a hose typically indicate?
• When cutting tubing, it is important to produce a ________ end that is free of ________.
• What is the recommended amount of slack needed when installing a flexible hose assembly?
• When assembling a flexible hose, how should the nipple be fastened?
• Which type of clamps should never be used for metal hydraulic, fuel, or oil lines?
• Is a 45 degree flaring tool suitable for use with aircraft tubing?
• Which type of hydraulic fitting is best for applications requiring frequent assembly and disassembly?
• Which of the following can contribute to the abrasion of hydraulic hoses?
• In what direction should a tube cutter be rotated after being placed into position?
• When flaring aluminum tubing for use with AN fittings, the flare angle must be ________.
• Which color markings are generally used for lubrication lines?
• Which hose materials are compatible with phosphate-ester base hydraulic fluids?
• Why might a hydraulic system experience performance issues?
• What is a quick disconnect fitting?
• What does high-pressure fluid loss generally indicate?
• In which application are fluid lines particularly essential?
• What could happen if a hydraulic line is not properly connected?
• What is a best practice when installing a new hydraulic fitting?
• What method is recommended for cutting a flexible hose to length?
• Which property of hydraulic hoses is often specified for flexibility?
• What is meant by the term "fluid dynamics"?
• Tubing under ________ in diameter usually can be bent without the use of a ________.
• Which of the following statements regarding flare fittings is correct?
• What might excessive wear on a hydraulic fitting indicate?
• Must all fluid lines be secured at specified intervals?
• Which type of fitting requires precise alignment to ensure a proper seal?
• Why are bend radius specifications important in fluid lines?
• What is a potential consequence of a burst hydraulic hose?
• Which fitting is popular for connecting hydraulic lines on transport category aircraft?
• Flexible hose used in aircraft systems is classified in size according to the ________.
• How should the flaring pin be positioned over the tube during a single flare?
• What is the acceptable practice if a castle nut does not align with the cotter pin hole within torque range?
• What could happen if contaminants are not removed from hydraulic fluid?
• How are fluid lines in aircraft commonly identified?
• What tool is most commonly used to tighten hydraulic fittings?
• What is the purpose of using bends in tubing installations?
• Which two methods are commonly used to join rigid lines?
• What may result from using a clamp that is too small for the hose?
• What maintenance practice is important for maximizing the longevity of hydraulic hoses?
• What is cavitation in hydraulic systems?
• What does "working pressure" refer to in fluid lines?
• What type of hose is typically used for low-pressure applications?
• In metal tubing installation, what is considered undesirable?
• What is the effect of using too sharp a bend in fluid lines?
• Which property is crucial for maintaining the integrity of aluminum tubing in aircraft systems?
• What is the primary reason to avoid tension in metal tubing installations?
• What signs indicate that a hydraulic hose may be compromised?
• When installing bonded clamps to support metal tubing, what precaution should be taken?
• What should one consider when selecting hose clamps?
• How often should hydraulic lines be inspected?
• When is it acceptable to repair a scratch in aluminum tubing?
• What should be done if a hydraulic hose shows signs of significant wear?
• What is the first step in the basic procedure for flaring a tube?
• What can happen if a hose joint is improperly torqued?
• What color code corresponds to aluminum alloy number 5052?
• What type of tool is best for deburring the edges of cut tubing?
• Which type of seal is commonly used in hydraulic fittings to prevent leaks?
• Rolling-type flaring tools are used to flare which types of tubing?
• What can occur if hydraulic fluid overheats in the system?
• What is an advantage of a double flare on aluminum tubing?
• An aluminum alloy-5 flared fitting tubing nut should be torqued to which specification?
• What is the purpose of using lay lines on hoses?
• Which step should be performed first when making a single flare on a piece of tubing?
• What is a significant sign of wear in flexible hoses?
• Which statement is correct regarding Military Standard (MS) flareless fittings?
• What must be avoided during the installation of flexible hoses to prevent stress on fittings?
• How are flexible hoses classified?
• How should new MS flareless tubing/fittings be assembled?
• What is a method for repairing hydraulic tubing damaged in a localized area?
• What are the two main types of fluid lines used in hydraulic systems?
• How are standard AN fittings typically identified?
• What is the main advantage of using flexible hoses over rigid tubing?
• What does the term "burst pressure" mean?
• What is a possible indicator that a fitting is loose?
• What is the best tool to use for cutting aluminum tubing?
• Before making repairs to any aircraft tubing, it is important to make ________ of the tubing materials.
• What type of fitting is typically used at the end of a hydraulic hose?
• If a flared tube coupling nut is overtightened, where is the most likely point of damage?
• Excessive stress on fluid or pneumatic metal tubing caused by expansion and contraction due to temperature changes can best be avoided by ________.
• What purpose do seals serve in hydraulic systems?
• What components make up a flared tube fitting?
• Which fluid line routing practice should be avoided?
• According to Bernoulli's principle, what happens to fluid pressure at points of increased velocity?
• How many turns should a flareless tube nut be tightened?
• What is the primary function of a hydraulic filter?
• What does the term “crimping” refer to in hydraulic hose assembly?
• What is the main function of tapered threads in fittings?
• The recommended angle for an effective flare is typically ________ degrees.
• Which material is commonly used for hydraulic hoses?
• Which type of hydraulic fitting allows for angular adjustments?
• Which items should be inspected on flexible hoses?
• Identify a common symptom of a hydraulic leak.
• Which of the following is important when storing flexible hoses?
• What is the purpose of deburring a tube after cutting?
• How can fluid fittings contribute to the overall performance of a hydraulic system?
• What is the primary function of a hydraulic hose?
• What is the definition of hydraulic shock?
• In most aircraft hydraulic systems, two-piece tube connectors consisting of a sleeve and a nut are used when a tubing flare is required. This type connector eliminates ________.
• What type of coupling nut should be selected for 1/2 inch aluminum oil lines using flared tube ends?
• What are the limits for minor dents in aluminum alloy tubes?
• A gas or fluid line marked with the letters PHDAN is used to carry what type of substance?
• Can clamps or supporting clips smaller than the outside diameter of the hose restrict fluid flow?
• What factors should be considered when installing flexible hose?
• What is the standard bend radius for a 1" tube when using a portable hand bender?
• What is the ideal material for forming flares using rolling-type flaring tools?
• Which of the following is part of the procedure to assemble a flexible hose?
• What should be done to the ends of a cut tubing?
• What is the role of a hydraulic accumulator?
• Why is cleanliness crucial when working with fluid lines and fittings?
• How can you identify the material used in a given tube fitting?
• What is a failure mode that could occur in hydraulic lines?
• Aircraft fluid lines are usually made of ________ or ________.
• What type of tubing is required for a high-pressure hydraulic system?
• Why is ensuring the layout of the new line the same as the old line important?
• What is the consequence of incorrect installation of fluid lines?
• Which standard is commonly associated with hydraulic fittings?
• A certain amount of slack must be left in a flexible hose during installation because, when under pressure, it ________.
• What is the purpose of a pressure gauge in a hydraulic system?
• What is a common error when routing hydraulic hoses?
• Flexible lines must be installed with what percentage of slack based on their length?
• Which of the following statements about bonded and unbonded clamps is true?
• Which type of fluid line fitting is best for high-pressure applications?
• What are the four processes needed to form tubes?
• What is true regarding the minimum allowable bend radii for aluminum alloy and steel tubing of 1.5 inches OD or less?
• Is it acceptable practice to pull a line tight using a B nut?
• What is the effect of using hoses rated for a lower pressure than required?
• Using a two-piece tube connector in hydraulic systems eliminates which of the following concerns?
• What is true about the variety of symbols utilized on identifying color-code bands for plumbing lines?
• How far apart do hoses need to be supported during installation?
• What is the main function of a bulkhead fitting in fluid systems?
• Why is it crucial to use the correct size fluid line?
• What color markings are typically used for fluid lines?
• What does the material code letter 'D' following the AN number represent?
• What does "swaged" refer to in joining tube ends for repairs?
• What is a non-metallic fluid line?
• What is the MS number designated for cross flareless tube fitting?
• What is the primary function of a check valve?
• When is cavitation most likely to occur in a hydraulic system?
• What maintenance should be performed on hydraulic systems to prevent overheating?
• A scratch or nick in aluminum tubing can be repaired as long as it does not appear in what area?
• What should be done before disconnecting a pressurized line?
• What type of rubber compound is Neoprene based on?
• What type of connection is most commonly used in hydraulic fittings?
• What is typically the first step in the installation of hydraulic lines?
• What is the primary purpose of using swaged fittings in hydraulic systems?
• Which of the following is a common issue with metal tubing installations?
• What does the beading process in tube formation achieve?
• What is the inside dimension of a 3/4-inch 0.072 5052-0 aluminum alloy tubing?
• Which of the following is a potential result of hydraulic shock?
• What typically happens to a flexible hose if it hasn't been maintained correctly?
• What is used to determine hose twist in a flexible hose assembly?
• What does the dash number following the AN number indicate?
• What can cause a "fitting failure" in fluid systems?
• Which condition can adversely affect hose longevity in a hydraulic system?
• What are lay lines?
• If a tube bursts or cracks, it is generally the result of ________, ________, or ________.
• Why is it vital to adhere to proper torque specifications for hydraulic fittings?
• All tubing is pressure tested prior to ________ and is ________ withstand several times operating pressure.
• Which of the following is a common application for AN fittings?
• In what situation are swaged fittings typically used?
• What could be the consequence of using incorrect fittings on fluid lines?
• In what scenario is frequent inspection of hydraulic hoses essential?
• How is flexible hose size classified in aircraft systems?
• Is it appropriate to use bonded clamps to secure metal hydraulic lines?
• What is the color of an AN steel flared-tube fitting?
• What is permissible regarding flattening of tubing in bends?
• Which factor is NOT critical when tightening hydraulic fittings?
• What is the purpose of a fluid line support?
• What could indicate improper installation of a flexible hose?