How should overhead power lines near an aerial lift be treated?
- As safe if they are covered with weatherproof insulation
- As energized until the utility confirms they are de-energized and grounded
- As safe to approach if the lift has rubber tires and an insulating fiberglass basket
- As de-energized if no humming or buzzing can be heard
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B. As energized until the utility confirms they are de-energized and grounded
Every line is assumed live until the owner confirms it has been de-energized and visibly grounded, and the minimum approach distance (10 feet up to 50 kV) is kept. The covering on overhead conductors is weather protection, not insulation for contact.
Reference: 29 CFR 1926.600(a)(6); 29 CFR 1910.333(c)(3)
In earthwork, what does shrinkage describe?
- Loaded soil settling in the truck bed during a long haul
- Stockpiled soil losing volume as it dries in the sun
- Compacted fill taking up less volume than the soil did in the bank
- Excavated soil taking up more volume in the truck than it did in the bank
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C. Compacted fill taking up less volume than the soil did in the bank
Compaction can pack soil tighter than nature left it, so a bank yard often makes less than a yard of compacted fill. The last choice describes swell, the opposite effect.
Reference: NCCER Heavy Equipment Operations Level 1, Introduction to Earthmoving
How does a skid steer loader turn?
- By pivoting the frame at a center hinge joint
- By turning the front axle with a steering gear
- By steering the rear wheels with a hydraulic cylinder and ram
- By driving the wheels on each side at different speeds
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D. By driving the wheels on each side at different speeds
The wheels on each side of a skid steer are driven independently, so slowing or reversing one side makes the machine skid around. Center-hinge (articulated) steering is how a wheel loader turns.
Reference: NCCER Heavy Equipment Operations Level 1, Identification of Heavy Equipment