Free STSC Cranes, Derricks, Hoists, and Rigging Safety Questions and Answers

Question 1

A signal person is required for a crane lift when:

Accepted Answer

The point of operation is not in full view of the operator

Answer

The load exceeds 50% of the crane's capacity

Answer

The lift is being performed at night

Answer

The lift involves more than two workers

Question 2

What is the minimum required clearance from a 50kV power line when operating a crane?

Accepted Answer

10 feet

Answer

5 feet

Answer

15 feet

Answer

20 feet

Question 3

Who is primarily responsible for ensuring the ground conditions at a construction site are firm, drained, and graded sufficiently to support the crane?

Accepted Answer

The controlling entity

Answer

The crane operator

Answer

The crane rental company

Answer

The lift director

Question 4

How often must rigging equipment, such as slings and shackles, be inspected?

Accepted Answer

Prior to use on each shift

Answer

Once per week by a qualified person

Answer

Only when a critical lift is planned

Answer

Annually by a third-party inspector

Question 5

What is the primary purpose of using tag lines during a lift?

Accepted Answer

To control the load and prevent rotation

Answer

To add extra support to the rigging

Answer

To measure the height of the lift

Answer

To signal the crane operator

Question 6

A lift is generally considered a 'critical lift' and requires a detailed lift plan when it involves:

Accepted Answer

A load that exceeds 75% of the crane's rated capacity

Answer

Any load heavier than 1,000 pounds

Answer

Any lift performed after sunset

Answer

A load that must be moved more than 100 feet horizontally