[ILM] 101K Pipi Working Skills, Soldering, and Brazing

Question 1

pipe

Answer 1

conduits or long, narrow cylinders made of metal that have a constant outside diameter

Question 2

abrasive cloth =

Answer 2

waterproof cloth

Question 3

always use eye protection when using abrasive cloth for sanding

T or F

Answer 3

True

Question 4

flaring

Answer 4

45 degrees

Question 5

during flaring, use a drop of refrigerant oil on the flare cone

T or F

Answer 5

True

Question 6

annealed copper =

Answer 6

soft copper

Question 7

pure acetylene is highly _____

Answer 7

flammable

Question 8

always store acetylene in the

Answer 8

upright position

for 10 - 15 minutes before use

Question 9

regulators reduce acetylene pressure from 250 psi inside the cylinder to 15 psi for use with a torch

T or F

Answer 9

True

Question 10

Never use an adjustable wrench on an acetylene bottle’s valve stem

Never open an acetylene bottle’s valve stem more than 1/4 turn

T or F

Answer 10

True

Question 11

hose colour codes

Answer 11

acetylene - red
oxygen - green

Question 12

main disadvantage of copper is

Answer 12

its high coefficient of expansion

Question 13

the copper tube used for refrigeration piping is called

Answer 13

ACR

Question 14

Type K tubing
Type L tubing
Type M tubing (plumbing)

Answer 14

green
blue
red

Question 15

always keep copper tubing away from overhead power lines and wires since it is an excellent electrical conductor

Answer 15

True

Question 16

FPT
MPT

Answer 16

female pipe thread
male pipe thread

Question 17

Brass is the most common copper alloys, Zinc is added to produce brass

T or F

Answer 17

True

Question 18

iron pipe is used with

Answer 18

ammonia refrigerant since it reacts negatively with copper pipe

Question 19

Silver soldering & brazing uses temp above

Answer 19

800F

Question 20

soft soldering uses temp below

Answer 20

800F

Question 21

the space between the tube and fitting is the capillary gap

Answer 21

True

Question 22

solder fills this gap by capillary action

Answer 22

True

Question 23

if excessive amounts of flux are used

Answer 23

the flux residue may cause corrosion

Question 24

brazing uses filler metals that melt at temp ranging from

Answer 24

1100F - 1500F