CPC CPC Construction Equipment & Temporary Structures

Question 1

What is the primary factor that determines a crane's rated lifting capacity at a given radius?

Accepted Answer

Boom angle and load radius

Answer

A crane's rated capacity decreases as the load radius (horizontal distance from center of rotation to load) increases due to increasing overturning moment.

Question 2

Which excavation support system uses horizontal steel members braced against the trench walls with no external tiebacks?

Accepted Answer

Braced cut (internally braced excavation)

Answer

A braced cut uses internal struts or cross-lot bracing between opposite trench walls to resist lateral earth pressure without external anchors.

Question 3

What is the maximum safe working angle for a suspended scaffolding rope on a swing stage scaffold?

Accepted Answer

No more than 15 degrees from vertical

Answer

OSHA requires suspension ropes on two-point (swing stage) scaffolding to be plumb (vertical) or no more than 15 degrees from vertical to prevent swinging.

Question 4

A tower crane's 'out-of-service' wind speed rating is important because:

Accepted Answer

It defines the wind speed at which the crane must be weathervaned and unloaded

Answer

Out-of-service wind speed ratings define when a tower crane must be placed in free-slew (weathervane) mode with no load to reduce wind-induced forces.

Question 5

What is the purpose of a 'shoring' system in below-grade construction?

Accepted Answer

Temporarily support loads above while permanent structure is built below

Answer

Shoring provides temporary vertical support for structural loads above an excavation while the permanent foundation or structure is constructed below.

(CPC) Certified Professional Constructor Practice Test

(CPC) Certified Professional Constructor Practice Test

CPC CPC Construction Equipment & Temporary Structures