REF UNITS 5 to 6

Question 1

(5.6) What do reamers do?

Answer 1

they remove burs from cut piping.

Question 2

(5.6) What is the name of the part that slips on to the flaring block to expand the pipe diameter?

Answer 2

slip-on yoke

Question 3

(5.6) What tool is used to expand the end of soft-drawn copper tubing?

Answer 3

swaging tool

Question 4

(5.8) What tool is used to cut sheet metal?

Answer 4

tin snips

Question 5

(5.9) What tools are used to straighten the fins of evaporator and condenser coils?

Answer 5

fin straighteners

Question 6

(5.9) What do refractometers do?

Answer 6

They retrofit a mineral oil system with POE oil

Question 7

(5.10) What do velometers and anemometers do?

Answer 7

measure velocity of airflow.

Question 8

(5.10) What do psychrometers measure?

Answer 8

wet and dry bulb temperatures (which is used to get humidity).

Question 9

(6.1) How are nails sized?

Answer 9

in pennies (higher the penny number, the larger the nail).

Question 10

(6.1) What is the difference between roofing nails, finishing nails, and common nails?

Answer 10

roofing nails have large heads, finishing nails have small heads, common nails have medium heads.

Question 11

(6.2) What tool punches staples into wood?

Answer 11

a staple tacker.

Question 12

(6.2) What are rivets for?

Answer 12

joining together 2 pieces of sheet metal

Question 13

(6.2) What is the name of a rivet and pin together?

Answer 13

a mandrel

Question 14

(6.3) How are wood screws specified?

Answer 14

by shank number (0 to 24) and length (in inches)

Question 15

(6.3) What are sheet metal screws also known as?

Answer 15

tapping screws

Question 16

(6.3) What does “5/16–18 UNC-2” represent for a machine screw?

Answer 16

5/16 inch outside thread diameter, 18 threads per inch, united national coarse, class of fit (wiggle room)

Question 17

(6.3) what this?

Answer 17

that’s right

Question 18

(6.4) What are toggle bolts for?

Answer 18

provide anchoring in hollow tile, building block, and gypsum board

Question 19

(6.5) what does PAT stand for?

Answer 19

powder-actuated tool

Question 20

(6.6) What does threaded rod and angle steel accomplish together?

Answer 20

they can custom hang things

Question 21

(6.6) What clamps are used with threaded rod and angle steel?

Answer 21

beam clamps

Question 22

(6.6) What is steel channel?

Answer 22

used in custom hanging things

Question 23

(6.8) What are these?

Answer 23

retaining rings

Question 24

(6.8) What are these?

Answer 24

hose clamps