The drywall hammer is especially suited for drywall installation because it has a _____
a. soft rubber head
b. hatchet-like blade on one end for cutting drywall
c. convex face
d. flexible handle
c
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Which of the following statements regarding safety training sessions is correct?
a. They are only required after an accident has occurred. b. They are usually conducted by the project manager. c. They should be conducted frequently by the crew leader. d. They are only conducted for new employees.
Although shielding gases are not toxic, they _____
a. are highly explosive b. can decompose into toxic gases c. can displace oxygen when released in a large quantity d. cause rapid metal corrosion
Three general areas of problems in air-conditioning systems include electrical problems, mechanical problems, and:
A) Wiring problems. B) Undercharge problems. C) Communication problems. D) Airflow problems.
Which of the following is NOT a correct step in the replacement of RLL with PLC ladder logic?
A) In an on-delay conversion, replace the NO timed contact with an XIC instruction addressed with the done bit of the PLC timer. In an off-delay conversion, replace the NO timed contact with an XIO instruction addressed with the done bit of the PLC timer. B) Replace the on-delay relay timer (NO timed closed type) with a TON PLC timer. Replace the off-delay relay timer (NO timed open type) with a TOF PLC timer. C) Select the time base so that the timing resolution meets the requirements of the application. D) Select the preset value so that the product of the time base and the preset value equal the delay time value.