NCCCO Mobile Crane Operator Test 2

Question 1

What action does a signal person intend the operator to perform if he extends his arm at shoulder height, makes a fist with his hand, and sticks his/her thumb up?

Accepted Answer

Boom up

Answer

The hand signal described – extending the arm at shoulder height, making a fist, and sticking the thumb up – is the universally recognized standard signal for 'Boom up' in crane operations. This clear and consistent signal ensures effective communication between the signal person and the crane operator, enhancing safety on the job site.

Question 2

When hoisting personnel, within what percentage of level must a telescopic boom crane be in order for the gross ratings in the load chart to remain valid?

Accepted Answer

1%

Answer

When hoisting personnel, maintaining precise levelness is critical for safety and to ensure the validity of the crane's load chart ratings. A telescopic boom crane must be level to within 1% of grade, as even minor deviations can significantly impact stability and the accuracy of the lift, posing a serious risk to personnel.

Question 3

The load line of the crane you're operating contacts an energized power line. There's no sign of any other danger, such as fire. What should you do?

Accepted Answer

Stay in the cab until the lines are de-energized

Answer

If a crane's load line contacts an energized power line and there is no immediate danger like fire, the safest course of action is for the operator to remain in the cab. The cab provides a degree of insulation, and exiting could expose the operator to dangerous step and touch potentials, which can be lethal.

Question 4

According to OSHA 1926.1413, how many randomly distributed broken wires in rotation- resistant rope are cause for replacement of the rope?

Accepted Answer

2 broken wires in 6 rope diameters

Answer

According to OSHA 1926.1413, rotation-resistant wire rope must be replaced if there are two randomly distributed broken wires in six rope diameters. This specific criterion indicates significant wear and potential for failure, necessitating replacement to maintain the integrity and safety of the rope.

Question 5

What is the net capacity of a crane on main boom unless the manufacturer states otherwise?

Accepted Answer

The capacity listed in the load chart minus the weight of the rigging and all attachments

Answer

The net capacity of a crane is the actual weight it can safely lift, which is determined by subtracting the weight of all rigging and attachments (like hooks, slings, and headache balls) from the gross capacity listed in the load chart. This calculation ensures that the total weight being supported by the crane's boom and hoist system does not exceed its safe working limit.

Uncategorized Practice Test

Uncategorized Practice Test

NCCCO Mobile Crane Operator Test 2