OSHA 30-Hour Construction Outreach (knowledge check)
Tools, electrical and site hazards: practice questions
Our OSHA 30 Construction bank has 23 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.
Question 1
How must suspended heavy equipment controls be left when blades and buckets are lowered for repair?
- Running, so the blade can be raised quickly
- In neutral, with motors stopped and brakes set
- In gear, with the engine idling
- Any position, as long as the operator has left the cab
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B. In neutral, with motors stopped and brakes set — When blades, buckets and dump bodies are lowered or blocked for repair or when not in use, all controls must be in neutral, with motors stopped and brakes set unless work requires otherwise.
Question 2
May a loaded powder-actuated tool be left unattended?
- Yes, if it is pointed at the floor
- Yes, for a short break
- Yes, if the safety is on
- No
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D. No — Loaded powder-actuated tools must not be left unattended, and loaded or empty tools must never be pointed at anyone.
Question 3
What must receptacles on temporary wiring be?
- Two-prong type, because they cannot be overloaded
- The grounding type, connected to an equipment grounding conductor
- Any type, including two-prong receptacles
- Ungrounded, for safety
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B. The grounding type, connected to an equipment grounding conductor — Receptacles on temporary wiring must be grounding type, and each branch circuit must contain a separate equipment grounding conductor unless in a complete metallic raceway.
Question 4
What must controls that are deactivated during work on circuits have?
- Paint
- Tags
- Tape over the switch only
- Nothing
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B. Tags — Controls that are to be deactivated during the course of work on energized or deenergized equipment or circuits must be tagged.
Question 5
In excavations where water is controlled by pumps, who must monitor the water removal?
- The pump rental company
- Nobody, once the pump is running
- Any laborer
- A competent person
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D. A competent person — If water is controlled by water removal equipment, the equipment and operations must be monitored by a competent person.