A suitably strong aggregate material for use in high-strength concrete is _____.
a. slag
b. soft sandstone
c. coal
d. shale
Answer: A
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Signals from a signal person are typically communicated to the crane operator using hand signals or _____.
a. voice b. signs c. colored flags d. horn blasts
For testing concrete from paving mixers, the whole batch should be discharged and samples taken from _____.
a. three locations b. five locations c. seven locations d. ten locations
What is considered the “evaporator temperature”?
a. The temperature of the refrigerant inside the evaporator tubing. b. The temperature of the air entering the evaporator. c. The temperature of the air leaving the evaporator. d. The temperature of the suction line leaving the evaporator.
Why does the CAC-A electrode holder have three holes in the head?
A) To prevent heat cracking of the unit (stress relief) B) For cooling purposes C) To allow compressed air flow D) To allow pure oxygen flow E) For reasons unknown