CHST CHST - Construction Health and Safety Technician Crane and Rigging Safety Questions and Answers 3 — Questions and Answers
Question 1: What is the minimum safe distance a crane must maintain from energized power lines rated at 50 kV or below?
- 5 feet
- 10 feet (Correct answer)
- 15 feet
- 20 feet
Correct answer: 10 feet
OSHA 29 CFR 1926.1408 requires a minimum 10-foot clearance from energized power lines up to 50 kV.
Question 2: When a crane operator cannot see the load at all times, what must be done?
- Reduce the load by 25%
- Use a signal person (Correct answer)
- Stop the lift immediately
- Switch to radio communication only
Correct answer: Use a signal person
OSHA requires a qualified signal person whenever the operator does not have a clear view of the load or path of travel.
Question 3: A wire rope used for rigging shows more than __ broken wires in one lay length and must be removed from service.
- 2
- 4
- 6 (Correct answer)
- 10
Correct answer: 6
Six or more broken wires in one rope lay, or three or more in one strand, is a criterion for removal from service per ASME B30.9.
Question 4: What document must be available in the cab or on the crane at all times during operations?
- Manufacturer's load chart (Correct answer)
- Daily inspection log
- Operator's training certificate
- Site safety plan
Correct answer: Manufacturer's load chart
OSHA 29 CFR 1926.1417 requires the load chart to be in the cab and legible so operators can verify capacity before any lift.
Question 5: Which factor does NOT affect a crane's rated load capacity?
- Boom length
- Boom angle
- Wind speed
- Operator's years of experience (Correct answer)
Correct answer: Operator's years of experience
Rated capacity is a mechanical/structural calculation based on boom angle, length, and configuration — operator experience is not a variable in the load chart.
Question 6: During a critical lift, who must review and approve the lift plan?
- The crane operator
- The site superintendent alone
- A qualified rigger and a qualified signal person
- A qualified person or licensed PE (Correct answer)
Correct answer: A qualified person or licensed PE
Critical lifts require a pre-lift plan reviewed and approved by a qualified person, and in some jurisdictions a licensed professional engineer.
Question 7: What is the purpose of a crane anti-two-block device?
- It prevents the load block from contacting the boom tip (Correct answer)
- It limits swing speed in high winds
- It monitors wire rope tension
- It automatically levels the crane on uneven ground
Correct answer: It prevents the load block from contacting the boom tip
An anti-two-block (ATB) device stops the hoist when the load block gets too close to the sheave block, preventing catastrophic wire rope failure.
CHST CHST - Construction Health and Safety Technician Crane and Rigging Safety Questions and Answers 3
What is the minimum safe distance a crane must maintain from energized power lines rated at 50 kV or below?