NCCCO Tower Crane

Before a tower crane is erected, which site condition must be verified first because it directly affects whether the base can safely carry imposed loads?

• ASoil and foundation support capacity
• BColor of the mast paint
• CBrand of the hook block
• DOperator parking location

A tower crane foundation area has standing water after several days of rain. What is the best operator-side response before normal lifting resumes?

• AIgnore it if the crane passed last week
• BHave the support condition evaluated before operating
• COperate only at slow speed
• DAdd more counterweight

A contractor begins excavating close to the tower crane base. Why is this a serious concern?

• AIt may reduce support for the crane foundation
• BIt improves crane stability by creating drainage
• CIt increases line pull in the hoist
• DIt reduces hook block weight

Which site-planning control best protects workers and the public from being under a suspended load?

• ALonger radio messages
• BA clearly enforced exclusion zone below the load path
• CA brighter operator cab light
• DMore grease on the trolley rails

When overhead line voltage cannot be determined, what minimum clearance is generally used under OSHA crane rules until the line is de-energized or the voltage is confirmed?

• A5 feet
• B10 feet
• C20 feet
• D50 feet

For power lines rated up to 50 kV, what minimum clearance is generally required between any part of the crane or load and the energized line?

• A6 feet
• B10 feet
• C15 feet
• D25 feet

A tower crane will slew over a sidewalk that remains open to pedestrians. What is the best site-planning decision?

• AContinue if the load is light
• BControl or close the area so the public is kept out of the hazard zone
• CUse hand signals only
• DIncrease travel speed to reduce exposure time

Why should the planned swing path of the counterjib be checked before operations begin?

• ATo make sure the crane turns toward the nicest view
• BTo confirm there is no structure, equipment, or personnel exposure in the swing area
• CTo reduce the need for lubrication
• DTo improve radio battery life

A crane that was level during erection is found to be slightly out of plumb after several weeks on site. What is the best conclusion?

• AThis is normal and needs no attention
• BThe support condition or structure may have changed and should be evaluated
• COnly the load chart needs updating
• DThe operator should compensate by booming out less

Which weather condition is the strongest reason to postpone a lift before it starts?

• AMild overcast skies
• BForecast and measured winds approaching or exceeding site limits
• CA cool morning temperature
• DLight dew on parked vehicles

What is the best reason to inspect the full load path before a pick?

• ATo find the fastest route for the hook only
• BTo identify obstructions, occupied areas, and clearance conflicts before moving the load
• CTo keep the operator busy while riggers work
• DTo determine cab air conditioning needs

A tie-in location on a building has been altered from the original plan by another trade. What should happen before the tower crane continues operating with that tie-in?

• ANothing if the bolts still fit
• BThe changed tie-in condition must be reviewed and approved by the proper authority
• CThe operator should just reduce load weight by 10 percent
• DOnly the signalperson needs to be informed

Which site condition most directly increases the chance that personnel will unexpectedly enter the load path?

• APoorly controlled access around the work zone
• BAn oversized hook latch
• CA recently greased slew ring
• DA high-capacity hoist motor

If lightning is observed in the area, what is the safest course of action for tower crane operations?

• AContinue lifting but use smaller loads
• BStop operations and follow site procedures for severe weather
• CLower the hook faster than normal
• DRotate only in one direction

Why is poor visibility a site-level concern before a lift begins?

• AIt makes the crane look taller
• BIt can prevent the crew from maintaining clear path, landing area, and hazard awareness
• CIt improves radio communication
• DIt decreases trolley speed automatically

A jobsite stores heavy material directly adjacent to the tower crane foundation without approval. Why is this a problem?

• AIt can change loading on the supporting area and interfere with safe access
• BIt makes radio reception too strong
• CIt increases hook rotation speed
• DIt sharpens the wire rope bend radius

What is the main reason to check that the crane can weather-vane freely when placed out of service?

• ATo keep the cab warmer
• BTo allow the crane to align with the wind instead of resisting it
• CTo reduce foundation size
• DTo eliminate the need for inspections

A new scaffold is erected inside the crane swing radius. What should happen before further operation?

• ANothing if it is not touching the mast
• BThe new obstruction and personnel exposure must be evaluated and controlled
• COnly the scaffold crew decides
• DThe operator should use higher speed to pass it quickly

Why should a tower crane site plan account for nearby cranes or overlapping operating areas?

• ABecause overlapping areas can create collision and coordination hazards
• BBecause nearby cranes improve each other’s load chart capacity
• CBecause it eliminates the need for signals
• DBecause two cranes always share the same hook height

Which site condition most directly threatens a freestanding tower crane during severe wind if left uncorrected?

• AA dirty cab window
• BA blocked weather-vaning path or unapproved out-of-service setup
• CAn empty water cooler
• DFresh paint on the mast

What is the safest response if the planned landing area becomes cluttered or occupied after the lift has already been scheduled?

• ALand the load anyway before the area gets worse
• BStop and re-establish a clear landing area before proceeding
• CLower the load faster to reduce time over the area
• DAsk workers to move only after the load is directly above them

Why can repeated freeze-thaw cycles around the crane support area justify a reassessment of site conditions?

• AThey can affect soil or support behavior over time
• BThey increase radio interference only
• CThey change the hook block serial number
• DThey automatically recalibrate limit switches

If the load path must pass near energized lines even after planning, what is the best overall strategy?

• ATrust the operator’s judgment and continue normally
• BUse the required clearance controls and approved power-line procedures before the lift
• CMove the load faster through the area
• DAdd a second signalperson but no other controls

Which site-planning question is most important when the crane will handle long loads near a building façade?

• AWhether the cab radio volume is high enough
• BWhether the load path provides adequate clearance for load rotation and drift
• CWhether the hook block is painted yellow
• DWhether the mast sections all came from the same shipment