WorksheetsDECK CRANE, WINCH AND WINDLASS
Total questions: 20
Worksheet time: 10mins
Which of the following best describes the luffing operation of a deck crane?
Rotating the crane and moving the boom horizontally
Adjusting the boom angle to change reach
Raising and lowering the hook vertically
Controlling the crane speed
During cargo operations, the crane fails to lift even though the motor runs. The most likely cause is:
Overload protection tripped
Brake locked
Hydraulic pressure too high
Slewing system failure
Which of the following components of the windlass directly engages with the anchor chain?
Drum
Clutch
Wildcat
Chain stopper
In anchoring operations, why is the chain stopper used after heaving up the anchor?
To assist in hoisting
To prevent chain damage and easily heaving up the anchor
To hold the load independently of the windlass
To control anchor speed
A mooring winch designed with automatic tension control primarily ensures:
Equal speed on both drums
Constant line tension during vessel movement
Power saving and man power during mooring operation
Simultaneous pay-out of all mooring lines
If a winch drum continues rotating after the stop command, what system is most likely malfunctioning?
Motor control circuit
Brake system
Clutch assembly
Speed governor
When anchoring, the safest method to control the anchor’s descent is:
Allowing free fall of the chain
Using the clutch to disengage the wildcat
Gradually releasing the brake to control speed
Reversing motor direction to pay out released the anchor
A vessel’s mooring winch overheats during continuous operation. The most probable cause is:
Drum misalignment
Excessive electrical resistance
Overloading or prolonged heaving
Hydraulic fluid contamination
What could be the consequence of failure of the clutch system in a windlass during anchoring?
The anchor cannot be raised or lowered
The chain stopper will release automatically
The motor will run in reverse
The brake will fail to engage
From a control systems perspective, which feedback signal is critical for automated winch tension control?
Drum rotational speed sensor
Line tension or strain sensor
Power supply voltage
Oil pressure in the gearbox
If the crane’s boom luffing is too slow, which parameter should be checked first in a hydraulic system?
Oil temperature
Hydraulic pressure and flow rate
Electric motor current and voltage
Cable insulation resistance
During deck crane operation, the hydraulic oil temperature rises steadily even under moderate load. Which is the most probable underlying issue based on system design principles?
Excessive hydraulic leakage causing energy loss
Over-sized relief valve bypassing flow continuously
Undersized reservoir volume reducing heat dissipation
Air entrainment reducing fluid density
The load moment indicator (LMI) of a deck crane shows erratic readings despite stable lifting. Which advanced diagnostic approach should be applied first?
Inspect hydraulic flow sensors for clogging
Calibrate the strain gauge signal conditioning current circuit
Replace the pressure transducer immediately
Check the LMI’s digital filtering parameter for signal noise
A windlass motor intermittently trips during anchor heaving even though amperage appears normal. Which condition best fits the observed behavior?
Intermittent brake drag increasing transient torque
High harmonic distortion in the power supply
Bearing wear causing random mechanical lock
Gear misalignment generating cyclic load peaks
If a winch exhibits a slow response to control lever movement but achieves normal speed after a delay, what should be the primary analytical focus?
Servo valve pilot pressure lag
Air in hydraulic cylinder
Excessive friction in drum bearings
Incorrect motor speed calibration
During mooring, a winch drum continues to rotate slightly after the brake is applied. Which subtle system imbalance is most likely responsible?
Incomplete clutch disengagement allowing drag torque
Brake glazing reducing coefficient of friction
Hydraulic accumulator maintaining residual pressure
Misalignment between drum shaft and gearbox
When monitoring the windlass during anchor lowering, a rhythmic metallic thumping is heard. Which analytical conclusion best explains this symptom?
Brake linkage slackness
Chain link pitch mismatch with wildcat pockets
Gear backlash due to wear
Loose and wear foundation bolts on the windlass bed
In the deck crane hydraulic circuit, the boom luffing motion vibrates at the midpoint of its range but operates smoothly near the ends. What diagnostic insight does this pattern suggest?
Servo damping coefficient imbalance
Cylinder rod misalignment
Pressure compensator hunting at mid-stroke
Cavitation due to suction restriction
A windlass fails to release the anchor smoothly even when the brake is loosened. The operation manual indicates “hydraulic drag.” What mechanical factor is most consistent with this diagnosis?
Misadjusted clutch release mechanism
Excessive oil viscosity in hydraulic couplings
Worn gear coupling between motor and shaft
Faulty brake pad alignment
A deck crane’s hoist motor draws high current even when operating without load. According to system monitoring principles, what is the most probable root cause?
Motor misalignment with gearbox input shaft
Hydraulic pump relief valve stuck partially open
Mechanical binding in drum bearings
Incorrect phase rotation in motor supply
