NCCER Crane Crane Safety Devices & Operational Aids 2 — Questions and Answers
Question 1: Under OSHA 1926.1416, a Category I operational aid such as the anti two-block device that stops working must be repaired within how many calendar days?
- 3 calendar days
- 7 calendar days (Correct answer)
- 14 calendar days
- 30 calendar days
Correct answer: 7 calendar days
OSHA requires Category I aids (boom hoist limiter, luffing jib limiter, anti two-block) to be repaired within 7 calendar days of the deficiency.
Question 2: How long does OSHA allow for repairing a malfunctioning Category II operational aid such as a boom angle indicator?
- 7 calendar days
- 14 calendar days
- 30 calendar days (Correct answer)
- 60 calendar days
Correct answer: 30 calendar days
Category II aids, such as boom angle and load weighing devices, must be repaired within 30 calendar days.
Question 3: While the anti two-block device on a telescopic boom crane is out of service, which temporary alternative measure does OSHA accept?
- Reduce the hoist speed to half
- Clearly mark the hoist cable so the operator can see it and use a spotter (Correct answer)
- Operate only with the boom fully retracted
- Add counterweight to the crane
Correct answer: Clearly mark the hoist cable so the operator can see it and use a spotter
For telescopic booms, the temporary alternative is to mark the cable where the operator can see it and use a spotter when extending the boom.
Question 4: Which item does OSHA 1926.1415 classify as a safety device rather than an operational aid?
- Load moment indicator
- Crane level indicator (Correct answer)
- Boom angle indicator
- Hoist drum rotation indicator
Correct answer: Crane level indicator
The crane level indicator is a required safety device under 1926.1415, while the others are operational aids under 1926.1416.
Question 5: If a required safety device under OSHA 1926.1415 is not working properly, what must the operator do?
- Continue working and report it at shift end
- Use a temporary alternative measure for up to 7 days
- Stop crane operations until the device is working again (Correct answer)
- Reduce the load by 25 percent and keep working
Correct answer: Stop crane operations until the device is working again
Unlike operational aids, safety devices have no temporary alternative; operations must cease until the device is repaired.
Question 6: What is the main purpose of a hoist drum rotation indicator?
- To show the rope's tension in pounds
- To let the operator sense drum movement and direction when the drum is not visible (Correct answer)
- To measure the length of rope remaining on the drum
- To stop the drum when the load reaches capacity
Correct answer: To let the operator sense drum movement and direction when the drum is not visible
The drum rotation indicator lets an operator who cannot see the drum know that it is turning and in which direction.
Question 7: A crane's anti two-block system activates during a lift. What is the device designed to do?
- Lock the swing brake
- Stop functions that would bring the hook block into contact with the boom tip (Correct answer)
- Lower the load automatically to the ground
- Retract the outriggers
Correct answer: Stop functions that would bring the hook block into contact with the boom tip
Anti two-block devices prevent the load block or headache ball from contacting the boom tip by disabling hoist-up, boom extend, and boom-down functions.
