AWTC Chapter 1
Chapter 1
Please answer the following questions, then press the "Grade My Test" button to find out your score.
 
  1. Efforts are made to eliminate ___________________ from steel because it can cause brittleness.  
 
a) sulfur
b) molybdenum
c) columbium
d) vanadium
 
  2. When crystals form, they meet at their ________________.  
 
a) freezing point
b) lattice line
c) grain boundary
d) microstructure border
 
  3. The term "drooper" is often used to describe what type of machine?  
 
a) rotating
b) constant voltage
c) constant current
d) camel back
 
  4. A welding operator strikes an arc and adjusts his machine to 27 volts and draws 280 amps. How much power in terms of watts does he use?  
 
a) 10.37
b) 0.103
c) 7560
d) 75.6
 
  5. The point at which a metal reaches the limit of its elastic characteristic determines its ____________________.  
 
a) tensile strength
b) percentage of elongation
c) yield strength
d) creep strength
 
  6. Steel is an alloy of carbon and iron.  
 
a) TRUE
b) FALSE
 
  7. As long as power supplied to a transformer circuit is held steady, the secondary current will decrease as the primary voltage ____________.  
 
a) decreases
b) stabilizes
c) rectifies
d) increases
 
  8. A change in temperature sufficient to alter the crystalline structure of a metal is known as ___________________.  
 
a) alpha iron
b) phase transformation
c) dendrites
d) austenitic
 
  9. The properties of metals are determined by their microstructure.  
 
a) TRUE
b) FALSE
 
  10. A metal which has a high iron content is known as a ___________ metal.  
 
a) heavy
b) ferrous
c) basic
d) non-ferrous
 
  11. In the equation I = E ÷ R, the letter "E" represents  
 
a) amperes
b) volts
c) electron
d) watts
 
  12. Steel, which has a total alloy content of 10% or more, is known as a low alloy steel.  
 
a) TRUE
b) FALSE
 
  13. During one AC cycle, current is at its maximum negative at what degree of rotation?  
 
a) 45° + 180°
b) 90° + 270°
c) 180° + 360°
d) 0° + 180°
 
  14. In arc welding, electrical energy is changed to heat energy.  
 
a) TRUE
b) FALSE
 
  15. Alternating current is changed to direct current through the use of a ____________.  
 
a) transformer
b) rotating coil
c) rectifier
d) voltage regulator
 
  16. A type 4340 steel has approximately 40% carbon content.  
 
a) TRUE
b) FALSE
 
  17. If the electromotive force is sufficient, voltage will move through a conductor.  
 
a) TRUE
b) FALSE
 
  18. The notch toughness of steel is greatly improved with the addition of  
 
a) carbon
b) nickel
c) manganese
d) silicon
 
  19. The two types of slag used in steel refining are acid and _________________.  
 
a) deoxidized
b) open hearth
c) sweet
d) basic
 
  20. The reluctance of atoms to give up their electrons is known as  
 
a) electromotive force
b) inductance
c) electrical resistance
d) rectification
 
  21. The movement of protons throughout the length of a conductor constitutes an electrical current.  
 
a) TRUE
b) FALSE
 
  22. In a constant current welding power source, the welding current remains relatively constant despite considerable changes in ___________________________.  
 
a) resistance
b) arc length
c) primary voltage
d) rectification
 
  23. ___________________ is one of the most effective alloying elements for increasing the hardness and strength of steel.  
 
a) Chromium
b) Copper
c) Tungsten
d) Carbon
 
  24. Unlike charges attract and like charges repel.  
 
a) TRUE
b) FALSE
 
  25. How much voltage is needed to pass 150 amps through a resistor of .14 ohms?  
 
a) 1071.4
b) 9
c) 230
d) 21