150
The turning of blades on their longitudinal axis
What is pitch
OSHA's chart of standard method hand signals must be posted ________.
In a conspicuous location on the jobsite
Fuses and Circuit Breakers
What are two types of automatic overload devices normally used in electrical circuits?
what is the most widely used type of mobile cranes?
Telescopic boom cranes
What is effective value?
The value of the AC current equivalent to DC current.
How do you climb safely
Maintaining three points of contact, and smooth calm movements with power coming from your legs.
Alternate one hand signals to signal telescopic boom retraction and extension are ______.
Found in ASME Standard B30.5
Circuit Breakers are classified as 100A, 225A, 400A, 1000A, and 2000A frames.
What are those numbers are commonly called?
True or false
If it is necessary to switch from hand signals to verbal signals during operation, all cranes must continue.
False
All cranes must stop all motion before doing so.
Materials placed under energized powerlines are placed in a crane's___.
Avoidance Zone
What is the cheapest form of energy production between wind, solar, and coal plants.
Solar
Verbal communication Barriers include language difference over use of abstractions, and _____
Lack of Confidence
5000A
What does NEC Section 240.83(c) requires circuit breakers to have current interrupt rating other than?
If a mechanical problem, the operator must ____
Lower the load immediately, secure the crane, then report it.
What is the value used to convert rms voltage to peak voltage?
1.414 X peak value
The button that opens an emergency circuit in the tower and stops power to going from major functions like pitch and brake release
What is a E-stop
Effective nonverbal communications between the signal person and the crane operator depend on a clear _________.
Line of Sight
Arc Fault Circuit Breaker
What device(s) protect against over currents?
An electrical communication referred to as
DECT (Digital Enhanced cordless telecommunications.)
Overloads often occur when the current level is__?
1 or 6 times the normal current rate.
What is the main switch gear?
A component that disconnects the tower from the grid.
The standard method of hand signals is found in which standard?
29 CFR 1926, Subpart CC, Appendix A
One and Six
What times overloads are most often between the normal current level?
___ is the greatest barriers to effective communication.
Fear
What type of fuse is best for providing short circuit protection?
Single element fuse