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NCCCO Overhead Crane study materials
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NCCCO Overhead Crane practice questions

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Question 1Site, Work Area, and Environmental Hazards

What must be done before an overhead crane is operated near energized overhead power lines?

  1. Reduce the load to one-half of the crane's rated capacity
  2. Have a signal person stand between the crane and the lines
  3. Maintain the required minimum clearance Correct answer.
  4. Have the operator wear insulating gloves and proceed slowly

Explanation

Energized lines must be de-energized and grounded, relocated, or guarded, or the crane must be kept at the required minimum clearance from them. The clearance applies to every part of the crane, the load, and the rigging, not just the hook. Neither PPE nor load reduction substitutes for that clearance.

Question 2Site, Work Area, and Environmental Hazards

Which condition must the floor or runway supporting overhead crane travel satisfy?

  1. It is level and structurally sound Correct answer.
  2. It is covered with timber mats to protect the surface
  3. It may slope toward a drain for runoff
  4. It is shimmed or blocked by the operator whenever travel is rough

Explanation

Runways and floors must be level, sound, and capable of carrying the crane and the loads imposed on it. Slopes and soft spots cause unintended travel, load drift, and structural overstress. Surface coverings do not correct a deficient runway.

Question 3Site, Work Area, and Environmental Hazards

What level of lighting is required in the area where an overhead crane operates?

  1. Only the load hook needs to be illuminated at night
  2. Enough light to see the cab instrument panel
  3. Enough light to see the load, hook, and signals Correct answer.
  4. Whatever lighting exists from nearby workstations

Explanation

The work area must be illuminated so the operator can see the load, the hook, the rigging, and the signal person throughout the travel path. Poor lighting hides obstructions and makes hand signals unreadable. Light borrowed from other work areas is not a planned or reliable level.

Question 4Site, Work Area, and Environmental Hazards

How should aisles and travel paths in the crane's operating area be maintained?

  1. Available for temporary storage between shifts
  2. Cleared once a week by the maintenance crew
  3. Kept clear of material and debris at all times Correct answer.
  4. Marked only where pedestrians regularly walk

Explanation

Obstructions in the travel path create impact hazards and can knock material into the load's path. Good housekeeping requires paths to stay clear continuously, not on a schedule. Painted markings alone do not remove stored material or debris.

Question 5Site, Work Area, and Environmental Hazards

How must pedestrians be kept out from under a suspended load?

  1. By sounding the travel horn whenever a person is seen
  2. By keeping the load no higher than chest level while it moves
  3. By barricades, signs, or an assigned person Correct answer.
  4. By requiring them to walk quickly and wear hard hats

Explanation

The fall zone beneath a suspended load must be positively controlled, using barricades, warning signs, or a person assigned to keep others out. A horn is a warning, not a barrier. Load height does not eliminate the hazard.

Question 6Site, Work Area, and Environmental Hazards

What should the operator of an outdoor crane do as wind speed nears the manufacturer's limit?

  1. Continue, but reduce the load to half of capacity
  2. Increase travel speed so lifts take less time
  3. Stop and secure the crane as specified Correct answer.
  4. Swing the crane to face the wind and keep working

Explanation

Manufacturer wind limits are structural and stability limits, and work must stop before they are reached. The crane is then secured per the manufacturer's procedure, which may include stowing the hook, setting brakes, and applying rail anchors. Load reduction does not make exceeding a wind limit acceptable.

Question 7Site, Work Area, and Environmental Hazards

Why is oil spilled on a crane runway rail a hazard?

  1. It dissolves the rail's protective coating
  2. It reduces wheel traction Correct answer.
  3. It attracts pests into the building
  4. It can freeze the wheels to the rail

Explanation

Lubricant between the wheel and the rail destroys the friction that drive wheels and brakes depend on, causing skidding, overshoot, and poor stopping. Spills must be cleaned up and the source corrected. Rail coatings and pest control are unrelated concerns.

Question 8Site, Work Area, and Environmental Hazards

Lightning has been observed near an outdoor crane. What should the operator do?

  1. Stop work, land the load, and secure the crane Correct answer.
  2. Lower the hook only after the storm has passed
  3. Park the crane at the highest point in the yard
  4. Keep working until rain actually reaches the site

Explanation

When lightning is detected within the site's warning distance, operations stop, the load is landed, and the crane is secured under the site's severe-weather procedure. The strike hazard exists before precipitation arrives. A suspended load must never be left hanging during a storm.

Question 9Site, Work Area, and Environmental Hazards

What is the main crane-related concern where combustible dust coats beams and equipment?

  1. Dust clouds make the runway lights too bright
  2. Dust can be ignited by hot surfaces or arcs Correct answer.
  3. Dust accelerates wear on the hoist chain
  4. Dust reduces the crane's rated capacity

Explanation

Accumulated combustible dust can be lofted into a cloud and ignited by hoist motor sparks, collector arcs, or hot surfaces, producing a secondary explosion. Housekeeping and electrical classification controls are the defense. Reduced capacity and chain wear are not the controlling hazard.

Question 10Site, Work Area, and Environmental Hazards

Two cranes share one runway. What is the operator's primary defense against collision?

  1. Maintaining separation and using the warning devices Correct answer.
  2. Raising the hook to its upper limit before traveling
  3. Traveling at full speed to clear the shared zone quickly
  4. Assuming the other operator will stop first

Explanation

Operators on a shared runway must keep the required separation and rely on the crane-to-crane warning, zoning, or anti-collision devices provided. Each operator retains responsibility for the movement of their own crane. Speed and hook height do not control closure between two structures.

Question 11Site, Work Area, and Environmental Hazards

What is the purpose of runway end stops?

  1. They guide the load while it is being hoisted
  2. They stop the crane at the runway ends Correct answer.
  3. They reduce rail wear during long travel of the crane
  4. They act as a backup braking system for the hoist

Explanation

End stops are physical bumpers that stop a traveling crane before it can run off the end of the runway. They are a last-resort travel limit and must be in place and intact. They do not guide the load or act on the hoist brake.

Question 12Site, Work Area, and Environmental Hazards

Before a heavy load is set down in an unfamiliar floor area, what should be verified?

  1. That the load is centered over a building column
  2. That the floor was swept within the last 24 hours
  3. The color of the painted floor markings in the area
  4. The floor rating and any voids or trenches below Correct answer.

Explanation

Setting a load requires knowing the floor's rated capacity and whether pits, trenches, basements, or buried utilities lie beneath it. Overloading or an unsupported span can cause collapse under the load or under the crane. Cleanliness and markings say nothing about structural capacity.

Question 13Site, Work Area, and Environmental Hazards

Why is a tagline used when a load must pass close to fixed obstructions?

  1. It controls load swing from outside the fall zone Correct answer.
  2. It speeds up the hoisting portion of the lift
  3. It increases the crane's rated capacity for the lift
  4. It allows the signal person to pull the load toward them

Explanation

A tagline lets a worker restrain rotation and swing while standing clear of the load's path. It is a control line, never a lifting or capacity device. Pulling a load toward yourself puts you under or beside the load, which is prohibited.

Question 14Site, Work Area, and Environmental Hazards

An unidentified liquid is spreading across the crane's travel path. What should be done?

  1. Note it in the log and report it at shift end
  2. Use the crane wheels to spread absorbent material
  3. Drive through the area quickly to avoid contact
  4. Stop travel there and report the spill Correct answer.

Explanation

An unknown substance may be slippery, corrosive, flammable, or toxic, so travel through the area stops until it is identified and cleaned up by the proper responders. The hazard must be reported immediately so others are protected. Delayed reporting leaves the risk in place for the next shift.

Question 15Site, Work Area, and Environmental Hazards

Radio communication with the signal person is lost during a lift. How should this be treated?

  1. As a stop condition until communication is restored Correct answer.
  2. As a minor issue if the load is light
  3. As a reason to continue at reduced travel speed
  4. As a reason to accept hand signals from anyone nearby

Explanation

Loss of the agreed signal system removes the operator's ability to stop the load on command, so the load is landed and the lift stops until communication is restored. Only the designated signal person may direct the lift. Continuing at reduced speed does not restore control.

Question 16Site, Work Area, and Environmental Hazards

How should access beneath a crane's hook and load be managed?

  1. Allowed only during the swing portion of the lift cycle
  2. Restricted to stopped-crane conditions Correct answer.
  3. Allowed any time the crane is not traveling along the runway
  4. Allowed whenever all personnel are wearing hard hats and vests

Explanation

The area under a hook and load is a fall zone and entry is limited to times when the crane is stopped and the load is landed or the zone is positively blocked. PPE does not protect against a dropped load. The swing phase is when the load is moving and least predictable.

Question 17Site, Work Area, and Environmental Hazards

What is the main risk to an operator working in a hot cab near furnace equipment?

  1. Heat stress reducing alertness Correct answer.
  2. Increased wear on the hoist brake lining
  3. Static discharge through the operator's seat
  4. Accelerated cycling of the hydraulic fluid

Explanation

Sustained heat exposure raises core temperature and causes fatigue, poor judgment, and slower reaction time, which are serious hazards in a precision operation. Controls include ventilation, cooling, hydration, and scheduled breaks. Machine wear and fluid behavior are maintenance issues, not the personal risk.

Question 18Site, Work Area, and Environmental Hazards

Before traveling with a raised load, what must the operator confirm?

  1. The load is at least 10 ft above the floor
  2. The runway lighting has been switched off
  3. The path is clear at the load's height Correct answer.
  4. All other personnel have left the building

Explanation

The operator must verify that nothing at the load's elevation - structures, conductor bars, piping, stored material - can be struck along the intended route. A fixed height above the floor does not guarantee a clear path. Reducing lighting would make the check impossible.

Question 19Site, Work Area, and Environmental Hazards

What should an operator know before starting a shift?

  1. The location of the time clock and break room
  2. The crane's purchase price and warranty terms
  3. The shutdown procedure and exit route Correct answer.
  4. The names of every other operator on site

Explanation

Emergency preparedness means knowing how to stop and secure the crane and how to leave the cab and the work area safely. This is part of the pre-shift hazard review. Commercial and administrative details do not prepare the operator to respond to an emergency.

Question 20Site, Work Area, and Environmental Hazards

An overhead crane must work near a 13.8 kV overhead line that cannot be de-energized or guarded. What minimum clearance does OSHA general industry set for lines up to 50 kV?

  1. 3 ft
  2. 25 ft
  3. 50 ft
  4. 10 ft Correct answer.

Explanation

For energized overhead lines rated up to 50 kV, OSHA general industry requires a minimum clearance of 10 ft for cranes and similar equipment. The distance increases by 0.4 in for each kV above 50 kV. The distance applies to the crane, the load, and the rigging in all positions.

Question 21Site, Work Area, and Environmental Hazards

A crane on a shared runway is locked out for repairs and cannot be moved. Which statement best describes the hazard it presents to the operating crane?

  1. It blocks current flow in the runway conductor bars
  2. It remains a fixed obstruction on the runway Correct answer.
  3. It may restart and travel toward the working crane without warning
  4. Its brakes could release and let it roll toward the working crane

Explanation

A locked-out crane cannot move, so the hazard is that it occupies a fixed portion of the runway. Travel toward it must be planned, with approach limits and stopping points that keep the required buffer. Lockout removes the electrical and motion hazards, not the physical one.

Question 22Site, Work Area, and Environmental Hazards

A welder clamps the welding ground lead to the crane hook instead of the workpiece. What is the primary hazard?

  1. The welder receives a shock whenever the crane travels
  2. The hoist brake releases and the load drops
  3. The crane's rated capacity is halved for that shift
  4. Stray current arcing through ropes and bearings Correct answer.

Explanation

Welding current must return to the machine through the workpiece; routing it through the crane forces it across rope, sling, and bearing interfaces where arcing can damage components or ignite combustibles. The ground clamp belongs on the workpiece, close to the weld. Capacity and brake function are not affected by the return path.

Question 23Site, Work Area, and Environmental Hazards

A crane runway runs along the edge of a newly dug trench. What is the main environmental risk to crane operations?

  1. Settlement that tilts the runway Correct answer.
  2. Loss of radio communication across the trench
  3. Dust from the excavation entering the cab
  4. Increased wind exposure over the open trench

Explanation

Excavation near a runway removes lateral and vertical support from the subgrade, so the runway can settle or tilt and put the crane out of level or out of plumb. The crane's stability and braking depend on a level, supported runway. Dust, wind, and radio coverage are secondary concerns here.

Question 24Site, Work Area, and Environmental Hazards

Another contractor plans to erect scaffolding directly under the crane's travel path. What is the operator's most appropriate action?

  1. Reduce the load to half of the rated capacity
  2. Stop work and resolve it with supervision Correct answer.
  3. Post a handwritten warning sign and keep operating
  4. Continue working and sound the horn when passing over them

Explanation

Conflicting work activities in the same area must be coordinated before the lift proceeds, through supervision and the site's lift-plan or permit process. A horn or a sign does not protect workers below from a dropped load. Load weight has nothing to do with the conflict between the two activities.

Question 25Pre-Operational Inspection and Crane Setup

Under ASME B30.2, frequent inspections of overhead and gantry cranes in normal service are performed at intervals of:

  1. Semiannually to annually
  2. Daily to monthly Correct answer.
  3. Every two to five years
  4. Annually to every two years

Explanation

ASME B30.2 defines two inspection classes: frequent inspections, at intervals from daily to monthly, which cover items that can be checked without disassembly, and periodic inspections, at one- to twelve-month intervals, which cover items requiring disassembly or more thorough examination.

Question 26Pre-Operational Inspection and Crane Setup

What is the function of the latch on a crane hook?

  1. It keeps rigging from slipping off the hook. Correct answer.
  2. It prevents rotation of the hook under load.
  3. It increases the hook's rated capacity.
  4. It shows when the hook is loaded to capacity.

Explanation

The hook latch closes the throat opening so slings, chains, and shackles cannot ride up and slip off the hook during a lift or when the load goes slack. A missing or non-functioning latch is a removal-from-service condition for the hook.

Question 27Pre-Operational Inspection and Crane Setup

Where must a crane's rated load be displayed?

  1. On a tag attached to the load being lifted
  2. On the crane, legible to the operator Correct answer.
  3. On a sign posted at the entrance to the building
  4. Only in the office maintenance logbook

Explanation

The rated load must appear on a durable plate or marking attached to the crane, positioned so the operator can read it from the operating position. This lets the operator verify that the intended lift is within the crane's capacity.

Question 28Pre-Operational Inspection and Crane Setup

When a pre-operational inspection reveals a defect that affects safe operation, what must the operator do?

  1. Stop using the crane and tag it out of service Correct answer.
  2. Ask a co-worker to operate the crane instead
  3. Operate at reduced speed until the end of the shift
  4. Note the defect in the log and continue working

Explanation

Any deficiency that affects safe operation must be corrected before the crane is returned to use. The crane is taken out of service, tagged, and reported so that a qualified person can repair it and verify it is safe.

Question 29Pre-Operational Inspection and Crane Setup

What information must be marked on or near each crane control?

  1. The date of the most recent inspection
  2. The maximum line pull of the hoist
  3. The name of the last qualified operator
  4. The function and direction it controls Correct answer.

Explanation

Each control must be marked to show the function and the direction of motion it produces, so the operator can act without guessing. Unmarked or illegible controls must be corrected before operation.

Question 30Pre-Operational Inspection and Crane Setup

Before starting bridge or trolley travel, what should the operator do to warn people in the area?

  1. Lower the hook to floor level
  2. Sound the crane's warning device Correct answer.
  3. Wait for a signal from the floor
  4. Flash the work lights twice

Explanation

The crane's audible warning device is used to alert personnel before and during travel, especially when the view is obstructed or people work nearby. The device must be checked during the pre-operational inspection so it is known to function.

Question 31Pre-Operational Inspection and Crane Setup

During a pre-operational inspection you find broken wires in the hoist rope in numbers exceeding the removal criteria. What is the correct action?

  1. Record it and continue to the next monthly inspection
  2. Remove the crane from service for repair Correct answer.
  3. Load-test the rope to see if it still performs
  4. Cut off the damaged end and keep the crane running

Explanation

When broken wires, distortion, or other damage exceed the applicable rope removal criteria, the rope must be replaced and the crane taken out of service. Field repairs such as shortening the rope or load testing are not operator decisions.

Question 32Pre-Operational Inspection and Crane Setup

Before making a lift, how does the operator check that the holding brake is working?

  1. Lower the load quickly and apply the brake at the floor
  2. Raise the load to full height and observe it for one minute
  3. Travel the bridge the full length of the runway with the load
  4. Raise the load a few inches, stop, and check that it holds Correct answer.

Explanation

The brake is checked by lifting the load slightly off the floor, releasing the hoist control, and confirming the load stays put without drifting. If the load creeps down, the brake needs attention before the lift proceeds.

Question 33Pre-Operational Inspection and Crane Setup

A hook must be removed from service when its throat opening has increased by more than what percentage of the original opening?

  1. 5 percent
  2. 25 percent
  3. 10 percent
  4. 15 percent Correct answer.

Explanation

Hook removal criteria include a throat opening increased more than 15 percent, wear exceeding 10 percent of the original dimension, and any bend or twist beyond 10 degrees. An opened throat lets the load shift and can allow rigging to slip out.

Question 34Pre-Operational Inspection and Crane Setup

How should the upper limit switch be checked during a pre-operational inspection?

  1. Lower the rated load and check that the hoist stops
  2. Run the empty hook up slowly and confirm the hoist stops Correct answer.
  3. Trip the switch by hand while the hoist is at rest
  4. Run the hook into the block at full speed to verify stopping

Explanation

The overhoist limit is verified by running an empty hook slowly toward the upper position and confirming the hoist stops before two-blocking occurs. Testing slowly limits damage if the switch fails to function.

Question 35Pre-Operational Inspection and Crane Setup

Before operating a crane, the operator should know the location of which item?

  1. The main power disconnect for the crane Correct answer.
  2. The spare parts cabinet in the maintenance shop
  3. The nearest fire hydrant to the building
  4. The building's rooftop ventilation controls

Explanation

The operator must be able to shut off power to the crane quickly in an emergency, so the location and operation of the disconnecting means must be known before operating. The disconnect is also the point where lockout is applied for maintenance.

Question 36Pre-Operational Inspection and Crane Setup

Which condition on a load chain requires the hoist to be removed from service?

  1. A twist or kink that will not straighten Correct answer.
  2. A light film of lubricant on the links
  3. A slight color change from the factory finish
  4. Normal wear polish on the link contact points

Explanation

A chain that is twisted, kinked, or otherwise deformed cannot articulate properly in the sheaves and sprockets and may fail under load, so the hoist is taken out of service. Chains are also checked for stretch, gouges, and cracks beyond the manufacturer's limits.

Question 37Pre-Operational Inspection and Crane Setup

Which condition of a sheave requires maintenance before operation?

  1. A light coating of grease on the sheave bearing
  2. A groove worn so the rope rides on its bottom Correct answer.
  3. Paint worn off the outer rim of the sheave
  4. A groove that matches the rope diameter closely

Explanation

When the groove wears deep enough that the rope bottoms out, the sheave no longer supports the rope properly, which pinches and fatigues the wire rope. Worn sheaves are re-machined or replaced, and the rope is inspected for related damage.

Question 38Pre-Operational Inspection and Crane Setup

Which practice helps prevent two-blocking damage to the hoist?

  1. Running the hoist at high speed while empty
  2. Using the upper limit switch as a normal stop
  3. Holding the pendant with both hands
  4. Stopping before the block reaches the hoist Correct answer.

Explanation

Two-blocking occurs when the lower load block is pulled up against the hoist or drum, causing rope damage and shock loading. The operator keeps the load block in view and stops hoisting well before the block contacts the upper structure, treating the limit device as a backup only.

Question 39Pre-Operational Inspection and Crane Setup

For an outdoor gantry crane, operation must stop when wind speed exceeds:

  1. the trolley speed in feet per minute
  2. the limit specified by the manufacturer Correct answer.
  3. any measurable wind at all
  4. the crane's rated load in pounds divided by ten

Explanation

Outdoor cranes have a manufacturer-specified maximum wind speed for safe operation, often tied to a wind-speed indicator or anemometer on the crane. Loads with large sail area can make the crane unstable well below that limit, so the operator also considers load shape.

Question 40Pre-Operational Inspection and Crane Setup

Periodic inspections under ASME B30.2 are performed at intervals of:

  1. three to five years
  2. each shift
  3. one week to one month
  4. one to twelve months Correct answer.

Explanation

Periodic inspections cover items that generally require disassembly or a more thorough examination than a frequent inspection, and they are scheduled at intervals from one to twelve months depending on the severity of service. Frequent inspections, in contrast, run from daily to monthly.

Question 41Pre-Operational Inspection and Crane Setup

During the inspection walk-around, what should the operator check about the runway end stops?

  1. That they can be removed for crane travel
  2. That they are in place, secure and undamaged Correct answer.
  3. That they are lubricated before each shift
  4. That they are painted the same color as the crane

Explanation

Runway end stops prevent the bridge from running off the end of the runway; they must be present, firmly anchored, and free of damage or deformation. Missing or loose stops are reported and the crane is not operated until they are restored.

Question 42Pre-Operational Inspection and Crane Setup

Before starting travel, the operator sees material stacked in the crane's path along the runway. What is the correct action?

  1. Sound the horn and travel at full speed
  2. Use the bridge to push the material aside
  3. Travel slowly past the material and continue
  4. Have the obstruction removed first Correct answer.

Explanation

The travel path must be clear before movement begins, so the obstruction is removed by the appropriate personnel rather than worked around. Striking stacked material can damage the crane, topple the stack, and injure people below.

Question 43Pre-Operational Inspection and Crane Setup

While inspecting the lower load block, the operator finds a crack in the block housing. What should be done?

  1. Use the crane only for loads under half capacity
  2. Remove the crane from service until it is repaired Correct answer.
  3. Continue using it if the crack is less than 1 inch long
  4. Fill the crack with epoxy and return to service

Explanation

Cracks in load-bearing components such as the block housing, hook, or equalizer indicate a loss of structural integrity, and the crane is removed from service for evaluation and repair. Cracks are never field-patched or tolerated by size.

Question 44Pre-Operational Inspection and Crane Setup

Before any maintenance or repair work on an overhead crane, which step is required?

  1. Extending the hoist to its highest hook position
  2. Making sure the pendant is stored on the floor
  3. Running the trolley to the center of the bridge
  4. Locking out and tagging the main power source Correct answer.

Explanation

The crane must be de-energized at the disconnecting means and locked out with a tag so it cannot be started while someone is working on it. Stored energy such as suspended loads and charged hydraulic or pneumatic systems is also released before work begins.

Question 45Pre-Operational Inspection and Crane Setup

A hook is bent or twisted out of its original plane by more than what angle, requiring removal from service?

  1. 10 degrees Correct answer.
  2. 2 degrees
  3. 5 degrees
  4. 20 degrees

Explanation

Hook removal criteria include any bend or twist exceeding 10 degrees from the plane of the unbent hook. Deformation indicates the hook has been overloaded or shock loaded, and it changes how the load sits in the saddle.

Question 46Pre-Operational Inspection and Crane Setup

Under ASME B30.2, when must a crane receive an initial inspection?

  1. Only after the first load has been lifted
  2. Before it is first put into service Correct answer.
  3. Only when the crane changes operators
  4. Only after the first year of operation

Explanation

An initial inspection is performed before a new, altered, modified, or extensively repaired crane is placed into service, to confirm it is properly installed and functioning. It is more thorough than the routine pre-use check and precedes any production lifting.

Question 47Pre-Operational Inspection and Crane Setup

Which wire rope condition requires removal from service regardless of the number of broken wires?

  1. A light film of lubricant on the outside of the rope
  2. Slight surface discoloration from weather exposure
  3. A kink, crushing, or bird-caging of the rope Correct answer.
  4. Normal polishing of the outer wires from the sheave

Explanation

Distortion such as kinking, crushing, bird-caging, or core protrusion permanently damages the rope's structure and load-carrying ability, so the rope is replaced no matter how few broken wires are counted. Broken-wire counts are only one part of the removal criteria.

Question 48Pre-Operational Inspection and Crane Setup

When operating a crane near energized power lines rated at 50 kV or less, the minimum required clearance is:

  1. 5 feet
  2. 10 feet Correct answer.
  3. 3 feet
  4. 8 feet

Explanation

Crane clearances from energized lines follow a voltage-based table; for lines of 50 kV or less the minimum approach distance is 10 feet, increasing for higher voltages. Where the required clearance cannot be maintained, the line is de-energized and grounded or a designated spotter and barrier are used per the applicable standard.

Question 49Pre-Operational Inspection and Crane Setup

During inspection, the operator finds the pendant cable jacket cut with bare conductors visible, although the crane still functions. What is the correct action?

  1. Remove the crane from service until repaired Correct answer.
  2. Use the crane only for light loads until the next shift
  3. Wrap the cut with tape and finish the shift
  4. Operate with the pendant held away from the cut

Explanation

Exposed conductors in the control cable create a shock and arc-flash hazard to the operator and anyone handling the station, and the condition can progress to a short that starts unintended motion. The crane stays out of service until a qualified person repairs or replaces the cable.

Question 50Pre-Operational Inspection and Crane Setup

What is the primary purpose of the rail sweeps mounted at the corners of a bridge crane's end trucks?

  1. To push small obstacles off the rail ahead of the wheels Correct answer.
  2. To clean and lubricate the top surface of the runway rail
  3. To measure how far the bridge has traveled along the runway
  4. To cushion the bridge when it contacts the runway end stops

Explanation

Rail sweeps are low plates or angles that ride just above the rail ahead of each wheel and clear loose objects from the rail path. Keeping the rail clear prevents the wheels from riding up over debris, which can derail the bridge or jam travel.