Block 3 Fluid Lines and Hoes

Question 1

Standard AN nut, sleeves & fittings are sized to fit tube O.D.; both are sized in 16ths of an inch indicated by dash #
-True
-False

Answer 1

True

Question 2

Rigid and flexible hoses are considered to have the same flow characteristics.
-True
-False

Answer 2

True

Question 3

Why is flexible hose installed with a certain amount of slack?
-With pressure applied, the hose decreases length & decreases diameter
-When pressure is applied, the hose decreases length & expands diameter
-When pressure is applied to the hose, it increases in length and diameter

Answer 3

When pressure is applied, the hose decreases length & expands diameter

Question 4

When a piece of metal tubing is installed in a bonded clamp, any paint or anodizing oxide film must be:
-Left in place to prevent corrosion
-Removed from the tube at the clamp’s location
-Removed from the tube at least two inches from each side of the clamp

Answer 4

Removed from the tube at the clamp’s location

Question 5

Aluminum alloy AN fittings are colored:
-Red
-Blue
-Orange
-Green

Answer 5

Blue

Question 6

Scratches and nicks in metal tubing can be repaired provided they are no:
-Deeper than 10% of wall thickness & not located in the heel of a bend
-Deeper than 20% of wall thickness & not located in the heel of a bend
-Deeper than 30% of wall thickness & not located in the heel of a bend
-Deeper than 15% of wall thickness & not located in the heel of a bend

Answer 6

Deeper than 10% of wall thickness & not located in the heel of a bend

Question 7

Steel tubing in sizes smaller than 1.5 inches OD require:
-A greater minimum bend radius than an aluminum alloy tube of the same size
-AN aluminum alloy fittings
-Installation by specially trained mechanic for that particular installation
-AN aluminum alloy fittings

Answer 7

A greater minimum bend radius than an aluminum alloy tube of the same size

Question 8

MS flareless tube fittings are normally torqued to proper values when installing these fittings.
-True
-False

Answer 8

False

Question 9

New MS flareless fitting are assembled using lubrication during the presetting process.
-True
-False

Answer 9

True

Question 10

Any high-pressure line (3,000 psi or greater) carrying a hazardous substance will be:
-5052-O aluminum alloy and marked with the letters PHDAN
-Corrosion resistant steel and marked with the letters HAZARDOUS
-Corrosion resistant steel and marked with the letters PHDAN
-Both statements are true

Answer 10

Corrosion resistant steel and marked with the letters PHDAN

Question 11

Teflon hoses require special treatment when temporarily removed:
-Because they become brittle and highly flexible after remaining in service
-Because they may have taken a set and will need to be supported
-Because the hose will deteriorate in an oxygen rich environment

Answer 11

Because they may have taken a set and will need to be supported

Question 12

A rolling-type flaring tool and a hand operated wheel-type cutter are used effectively on which of the following metals?
-Stainless steel, soft copper, and titanium
-Soft copper, brass, and aluminum
-Brass, titanium, and stainless steel

Answer 12

Soft copper, brass, and aluminum

Question 13

Which of the following publications list the standards for bolts protruding through self-locking nuts?
-AC 43.13-1B
-AC 43.13-2B
-14 CFR Part 43.13
-14 CFR Part 43.13

Answer 13

AC 43.13-1B

Question 14

½” flexible hose or a ½” metal tubing have similar flow charecteristics
-True
-False

Answer 14

True

Question 15

Aluminum alloy AN fittings have?
-37 degree flare
-35 degree flare
-39 degree flare
-45 degree flare

Answer 15

37 degree flare

Question 16

Aluminum alloy AC fittings have?
-37 degree flare
-35 degree flare
-39 degree flare
-45 degree flare

Answer 16

35 degree flare