Chapter 7 Practice Test Flashcards
A 50.0 lb can of welding electrodes weighs how many kg?
a. 227 kg
b. 25 kg
c. 22.5 kg - ,
d. 23,000 kg
e. none of the above
c. 22.5 kg
lbs to kg conversion factor is 0.45
0.45 X 50.0 = 22.5(three significant figures)
A weld joint is measured and found to be 345.0 rnm 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
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
What is the wire feed speed that is measured to be 175 in/min?
a. 0.070 ds
b: 74.1 mm/s
c. 7.41 mds
d. 70mm/s
e. 75 mm/s
b: 74.1 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
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
e. all of the above
What is the base unit for measuring mass in the SI system?
a. meter
b. kilogram
c. Megapascal
d. liter
e. none of the above
b. kilogram
The Federal Government has initiated the requirement that all future government documents must be published using the SI system.
a. true
b. false
a. true
The metric system, or SI, is far more complicated than the US system.
a. true
b. false
b. false
Many U.S. industries presently use the SI.
a. true
b. false
a. true
To be most effective, the U.S. worker must know which measurement system?
a. metric
b. SI
c. US customary
d. all of the above
d. all of the above
AWS has mandated the requirement that the metric system be used.
a. true
b. false
b. false
AWS has prepared a guide for aiding the transition to metrication. It’s designation is:
a. D1.l
b. Section VIII
c. A3.0
d. Al.1
e. none of the above
d. Al.1
Which of the following countries are not officially on the SI system?
a. Japan
b. Britain
c. Mexico
d. Australia
e. United States
e. United States
In the US customary system, what is the base unit ‘ounce’ used to measure?
a. mass
b. volume
c. all of the above
d. distance
c. all of the above
The US system of measurement is based on powers of 10.
4”-
a. true
b. false
b. false
Pressure and tensile strength are measured in the SI using what as the base unit?
a. liter
b. meter
c. pascal
d. Newton
e. hertz
c. pascal
Match the following terms with the property measured.
a. ampere I. frequency
b. hertz 2. energy
c. joule 3. electric current
d. meter 4. mass
e. kilogram 5. length
a3 b1 c2 d5 e4
Match the following prefixes with the correct values.
a. Mega 1. 1,000
b. milli 2. 0.01
c. kilo 3. 1,000,000
d. micro 4. 0.001
e. centi 5. 0.000001
a3 b4 c1 d5 e2
Match the following terms with the most appropriate SI units.
a. tensile strength 1. kilograms per hour
b. pressure 2. millimeter per second
c. deposition rate 3. megapascal
d. wire feed speed 4. kilopascal
e. flow rate 5. liter per minute
a3 b4 c1 d2 e5
A material having a tensile strength of 8.5 X 104 psi has what value in megapascals?
a. 5.9 X 106 MPa
b. 5.86054 X 104 MPa
c. 58MPa
d. 586.054 MPa
e. all of the above
d. 586.054 MPa
conversion factor for psi to MPa is 6.894 757 X 10^-3
8.5 X 10^4 X 6.894757 X 10^-3 = 58. 605435 X 10 on the calculator
= 586.054 MPa
A material having a tensile strength of 700.2 MPa has what value in psi?
a. 10.15 psi
b. 101.5psi
c. 1,015psi
d. 101,555.4 psi
e. 1.016 X 10^8 psi
d. 101,555.4 psi
conversion factor for MPa to psi is 1.450 377 X 10^2
700.2 MPa X 1.450377 X 10^2 = 1,015.554 X 10^2 on the calculator
=101,555.4 psi
Round off the following numbers to 3 significant figures.
a. 5.0067
b. 5.067
c. 5.675
d. 5.65
e. 5.0650
a. 5.01
b. 5.07
c. 5.68
d. 5.65
e 5.06
Round off the following to 2 significant figures.
a. 0.000345
b. 0.003450
c. 0.003451
d. 0.685
e. 0.682
a. 0.00034
b. 0.0034
c. 0.0035
d. 0.68
e. 0.68
For the number 387,291.0456 match the following digits with their position on the number line. a. 8 . 1. thousandths b. 1 2. ten thousands c. 3 3. hundredths d. 5 4. units e. 4 5. hundred thousands
a2 b4 c5 d1 e3
For the following numbers, match the proper number of significant figures for each given number.
a. 78.35 2
b. 22 5
c. 0.00342 6
d. 23.0034 4
e. 0.023400 3
a4 b2 c3 d6 e5
How many significant figures can the number 356,000,000 have?
a. 3
b. 5
c. 7
d. 9
e. all of the above
e. all of the above
When rounded to 3 significant figures, multiplying 386.43 times 37.0 equals?
a. 14,298
b. 1.43 X 10^4
c. 14,000
d. 14,297.91
e. none of the above
b. 1.43 X 10^4
the calculator answer is 14,297.91 rounded off to 3 significant figures
1.43 x 10^4
When rounded to 3 significant figures, multiplying 142 times 0.870 equals?
a. 123.54
b. 123.50
c. 124
d. 120
e. 123.540
c. 124
The calculator answer is 123.54
rounded off to 3 significant figures
1 24
Dividing 5.0 X 10^7 by 2.5 X 10^-3 equals?
a. 2.0 x 10^4
b. 2.0 x 10^-10
c. 2 x 10^10
d. 2.0 x 10^10
e. 2.0 x 10^-21
d. 2.0 x 10^10
The calculator answer is 2.0 (exponent value is 7-(-3) = +10)
2.0 X 10^10
When rounded to 2 significant figures, dividing 23 by 19 equals?
a. 1.2
b. 1.2105263
c. 1.21
d. 1.2105
e. 1.21053
a. 1.2
The calculator answer is 1.2105263 rounded off to 2 significant figures
1.2
When rounded to 2 significant figures, multiplying 3.4 X 102 by 17.8 X 10-5 equals?
a. 60.52 x 10^-3
b. 6.1 x 10^-2
c. 6.052 x 10^4
d. 6.1 x 10^2
e. 6.05 x 10^-2
b. 6.1 x 10^-2
The calculator answer is 60.52 (exponent value is 2 + (-5) = -3)
Rounding off to 2 significant figures, placed in scientific notation
6.1 X 10^-2
