AWTC Chapter 1
Chapter 1
Please answer the following questions, then press the "Grade My Test" button to find out your score.
 
  1. 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°
 
  2. 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
 
  3. Unlike charges attract and like charges repel.  
 
a) TRUE
b) FALSE
 
  4. If the electromotive force is sufficient, voltage will move through a conductor.  
 
a) TRUE
b) FALSE
 
  5. The two types of slag used in steel refining are acid and _________________.  
 
a) deoxidized
b) open hearth
c) sweet
d) basic
 
  6. The reluctance of atoms to give up their electrons is known as  
 
a) electromotive force
b) inductance
c) electrical resistance
d) rectification
 
  7. The properties of metals are determined by their microstructure.  
 
a) TRUE
b) FALSE
 
  8. In arc welding, electrical energy is changed to heat energy.  
 
a) TRUE
b) FALSE
 
  9. How much voltage is needed to pass 150 amps through a resistor of .14 ohms?  
 
a) 1071.4
b) 9
c) 230
d) 21
 
  10. When crystals form, they meet at their ________________.  
 
a) freezing point
b) lattice line
c) grain boundary
d) microstructure border
 
  11. The term "drooper" is often used to describe what type of machine?  
 
a) rotating
b) constant voltage
c) constant current
d) camel back
 
  12. Steel is an alloy of carbon and iron.  
 
a) TRUE
b) FALSE
 
  13. A type 4340 steel has approximately 40% carbon content.  
 
a) TRUE
b) FALSE
 
  14. A metal which has a high iron content is known as a ___________ metal.  
 
a) heavy
b) ferrous
c) basic
d) non-ferrous
 
  15. 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
 
  16. ___________________ is one of the most effective alloying elements for increasing the hardness and strength of steel.  
 
a) Chromium
b) Copper
c) Tungsten
d) Carbon
 
  17. 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
 
  18. 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
 
  19. Efforts are made to eliminate ___________________ from steel because it can cause brittleness.  
 
a) sulfur
b) molybdenum
c) columbium
d) vanadium
 
  20. Alternating current is changed to direct current through the use of a ____________.  
 
a) transformer
b) rotating coil
c) rectifier
d) voltage regulator
 
  21. In the equation I = E ÷ R, the letter "E" represents  
 
a) amperes
b) volts
c) electron
d) watts
 
  22. The movement of protons throughout the length of a conductor constitutes an electrical current.  
 
a) TRUE
b) FALSE
 
  23. Steel, which has a total alloy content of 10% or more, is known as a low alloy steel.  
 
a) TRUE
b) FALSE
 
  24. 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
 
  25. The notch toughness of steel is greatly improved with the addition of  
 
a) carbon
b) nickel
c) manganese
d) silicon