General Oral and Practical Questions And Answers Graded A+!!!!

What are the parts of a military standard flareless-tube fitting? - ANS A body, sleeve and nut What are the two kinds of flares generally used in aircraft plumbing systems? - ANS A single flare and double flare What is the principle advantage of flexible Teflon hose? - ANS It can be used in the same manner as rubber hose and has better operating strength and higher operating temperature range What is the difference between an AN fitting and AC fitting? - ANS Sleeve length, thread pitch and AN fittings have a shoulder between the end of the thread and the flare cone What is the purpose of a quick-disconnect? - ANS Disconnect without loss of fluid and entrance of air When fabricating a flexible hose, what percent of the total length must be allowed for freedom of movement under pressure? - ANS 5 and 8% How is the size of flexible hose determined? - ANS By the inside diameter in 1/16" increments What should be used to make a visual inspection of a weld? - ANS A magnifying glass and borescope What precision measuring instruments are used to measure outside dimensions? - ANS Outside micrometer calipers and vernier calipers What are the undesirable characteristics of a cold weld? - ANS Improper penetration with rough and irregular cold laps not feathered into the base metal What is the code system used by aluminum rivet and steel bolt manufacturers to identify AN standard parts? - ANS AN bolts can be identified by code markings on the bolt head. Aluminum rivets have markings on the rivet head for identifications What nondestructive testing methods could be used for detecting surface cracks in aluminum fittings? - ANS Dye penetrate, radiography, eddy current, ultrasonic testing and visual inspection How can the correct "grip length" for a bolt be determined? - ANS By measuring the thickness of the material with a hook scale inserted through the hole What is the difference between a general-purpose bolt and close tolerance bolt? - ANS Close tolerance bolts are machined more accurately than general purpose bolts What width should a welding bead have and what should be the depth of penetration in a butt weld? - ANS The bead width should be 3 to 5 times the thickness of the base metal and 100 percent penetration for a butt weld