Metric Practice For Welding Inspection Ch 7

Question 1

A 50.0 lb can of welding electrodes weighs how many kg?

a. 227 kg
b. 25 kg
c. 22.7 kg
d. 23,000 kg

Answer 1

c. 22.7 kg

lbs to kg conversion factor is 0.45
0.45 X 50.0 = 22.7(three significant figures)

Question 2

A weld joint is measured and found to be 345.0 mm long. How long is that joint in term’s of inches?

a. 135 in
b. 13.58 in
c. 8760 in
d. 876 in
e. 13.0 in

Answer 2

b. 13.58 in

rnrn to inches conversion factor is 3.937008 X 10
345.0 X 3.937008 X 10 = 1358.265 X 10-2 inches on calculator.
Answer must be rounded off to four significant figures
1358.265 X 10-2 = 13.58 inches

Question 3

What is the wire feed speed that is measured to be 175 in/min?

a. 0.070 ds
b: 74.0 mm/s
c. 7.4 mds
d. 70mm/s
e. 75 mm/s

Answer 3

b: 74.0 mm/s

incheslminute to mm/s conversion factor is 4.233 333 X 10.’
175 X 0.423333 = 74.083275 mm/s on calculator
Answer must be rounded off to three significant figures
74.1 mm/s

Question 4

Which of the following are the proper base unit(s) for linear measurement in the US system?

a. yard
b. inch
c. foot
d. mile
e. all of the above

Answer 4

e. all of the above

Question 5

What is the base unit (according to AWS) for measuring mass in the SI system?

a. meter
b. kilogram
c. Megapascal
d. liter
e. none of the above

Answer 5

b. kilogram

Question 6

6. A gas flow rate of 30 cfh is what in l/min?

a. 1.41/min
b. 14 1/min
c. 140 1/min
d. 64 1/min
e. 640 1/min

Answer 6

b. 14 1/min