NCCCO Tower Crane Operator Test 1 4

Question 1

On a luffing jib tower crane, how is the working radius changed?

Accepted Answer

By raising or lowering the angle of the entire jib

Answer

A luffing jib changes radius by varying the jib's angle of inclination rather than moving a trolley.

Question 2

When climbing a tower crane using an internal climbing frame, what must be verified before beginning the climb?

Accepted Answer

The slewing ring must be locked, load removed, and climbing frame properly seated

Answer

Before internal climbing, the slewing must be locked, the hook must be empty, and the climbing frame must be properly engaged to safely insert a new mast section.

Question 3

What is the function of the counter-jib on a top-slewing tower crane?

Accepted Answer

It carries the counterweight and hoist machinery to balance the load jib

Answer

The counter-jib extends opposite the load jib and carries counterweights plus the hoist motor to balance the crane.

Question 4

According to OSHA 1926.1416, how often must a tower crane's wire rope be inspected?

Accepted Answer

Before each shift by the operator and periodically by a qualified person

Answer

OSHA requires a visual inspection by the operator before each shift and periodic inspections by a qualified person based on service conditions.

Question 5

A tower crane is equipped with a 'dead man' control. What does this mean?

Accepted Answer

Controls automatically return to neutral when the operator releases them

Answer

Dead man controls require continuous operator pressure; releasing them causes all motions to stop and brakes to engage.

NCCCO (National Commission for the Certification of Crane Operators) Practice Test

NCCCO (National Commission for the Certification of Crane Operators) Practice Test

NCCCO Tower Crane Operator Test 1 4