NCCCO COO Core Written Exam

NCCCO / COO Core Written Exam (Latest Update 2025 / 2026) Practice Questions and Answers | Grade A | 100% Correct

Question:

What is the difference between an anti-two-block warning device and an anti- two-prevention system?

Answer:

Warning device only warns, but prevention system will stop the operation.

Question:

When an operator arrives at the jobsite and the crane is already erected, how would the operator check the main and auxiliary hoist brakes?

Answer:

Lift the load off the ground and apply the brake

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Question:

When should a tagline be used?

Answer:

When rotation of load would be dangerous

Question:

What is not a good location for crane setup?

Answer:

Above utilities

Question:

Who gives the operator hand signals?

Answer:

The person assigned prior to the lift

Question:

Why use mats or cribbing?

Answer:

To reduce ground pressure

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Question:

Tipping capacities of crawler cranes are based on what percentage of tipping?

Answer:

75%

Question:

Should the load be applied when determining the proper boom angle?

Answer:

Yes

Question:

When should the operator use the Arun by the seat of the pants technique?

Answer:

NEVER

Question:

Load radius is the distance from the center of gravity of the suspended load to

the:

Answer:

Center of rotation 3 / 4

Question:

Why is the primary reason for using a boom extension?

Answer:

Increase height

Question:

What is the minimum design factor required for a right regular lay main, boom, auxiliary hoist rope?

Answer:

3.5

Question:

When telescoping the boom section of an R/T, which section should be telescoped first?

Answer:

All sections should be telescoped equally

Question:

How does the operator determine if correct load chart is being used?

Answer:

Matching serial number

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