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Juru Bor (Driller) practice questions

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Question 1Occupational Safety, Health and Environmental Regulation

Under the Juru Bor (Driller) competency requirements, what is the primary purpose of the site-specific induction before a driller begins work on a new rig site?

  1. To confirm the driller can operate every rig control without supervision
  2. To record the driller's wages and shift roster for the project
  3. To familiarise the driller with site hazards, emergency arrangements, and local procedures Correct answer.
  4. To verify the driller's trade certificate with the client's HR department

Explanation

A site induction exists to make workers aware of the specific hazards, emergency procedures, muster points, and site rules that apply at that location. It does not replace task-specific training or certification checks, which are handled separately by the employer.

Question 2Occupational Safety, Health and Environmental Regulation

A driller notices that the rig's emergency stop button is damaged and does not latch when pressed. What is the correct immediate action under general occupational safety requirements?

  1. Ask a colleague to hold the button in place while drilling continues
  2. Note the fault in the logbook and resume work after lunch
  3. Tag the control out of service and stop work until it is repaired Correct answer.
  4. Continue drilling and report the fault at the end of the shift

Explanation

A failed emergency stop removes a critical safeguard, so the equipment must be isolated and work halted until the defect is corrected. Deferring repair or improvising a workaround leaves workers exposed to uncontrolled energy.

Question 3Occupational Safety, Health and Environmental Regulation

Which document must a driller consult to confirm the safe working load and inspection status of a lifting sling used on site?

  1. The rig's daily drilling report
  2. The sling's identification tag and current inspection record Correct answer.
  3. The site's visitor register
  4. The driller's personal training log

Explanation

Lifting accessories carry identification tags showing their working load limit, and their inspection records confirm they remain in service. These are the authoritative sources for safe use of the sling.

Question 4Occupational Safety, Health and Environmental Regulation

When a driller works near an open borehole at night, which control most directly reduces the risk of a person falling into the hole?

  1. Increasing the rig's lighting to maximum brightness
  2. Posting a warning sign at the site entrance
  3. Wearing high-visibility clothing on the platform
  4. Fitting a secured hard cover or barrier around the collar Correct answer.

Explanation

A fall into an open borehole is prevented by physical isolation, such as a secured cover or rigid barrier around the collar. Lighting and signage support awareness but do not physically stop a fall.

Question 5Occupational Safety, Health and Environmental Regulation

A driller is required to enter a confined space associated with the mud system. Which condition must be satisfied before entry is permitted?

  1. The driller has worked on the same pit for more than one year
  2. The entrant carries a personal gas monitor without a rescue plan
  3. A colleague has verbally agreed to check on the entrant occasionally
  4. Atmospheric testing is acceptable and a standby person is in place Correct answer.

Explanation

Confined space entry requires verified acceptable atmosphere, isolation of hazards, a competent standby person, and a rescue arrangement. Verbal check-ins or a lone monitor do not meet these requirements.

Question 6Occupational Safety, Health and Environmental Regulation

What does the hazard class label on a chemical drum used for drilling fluids primarily communicate to the driller?

  1. The supplier's recommended purchase quantity
  2. The physical and health hazards and required precautions Correct answer.
  3. The shelf life of the product after opening
  4. The country in which the product was manufactured

Explanation

Hazard labels convey the physical and health hazards of the substance together with the precautions needed for safe handling. They do not address commercial or logistical information.

Question 7Occupational Safety, Health and Environmental Regulation

A driller must dispose of used oil contaminated with drilling additives. Which approach complies with environmental regulation?

  1. Store it in labelled containers and send it to an approved waste contractor Correct answer.
  2. Dilute it with water and release it to the site drainage
  3. Pour it into the sump pit and cover it with soil
  4. Burn it in an open pit at the end of the shift

Explanation

Contaminated oil is a controlled waste that must be contained, labelled, and consigned to a licensed waste handler with proper documentation. Dilution, burial, or open burning are prohibited disposal methods.

Question 8Occupational Safety, Health and Environmental Regulation

During a drilling operation, a driller observes a small spill of hydraulic fluid spreading across the rig floor. What is the first priority action?

  1. Wait for the environmental officer to arrive before acting
  2. Stop the source if safe and contain the spill to prevent spread Correct answer.
  3. Wash the fluid into the site drain to clear the floor
  4. Complete the current rod change before responding

Explanation

Spill response begins with stopping the release where it is safe and containing the material to limit environmental and slip hazards. Washing it to a drain would cause a pollution incident.

Question 9Occupational Safety, Health and Environmental Regulation

Which personal protective equipment is specifically required when a driller handles drilling rods coated with drilling mud?

  1. Steel-capped boots only
  2. Chemical splash goggles and a full-face respirator
  3. Hearing protection alone
  4. Gloves and hand protection suited to the task Correct answer.

Explanation

Handling mud-coated rods exposes the hands to abrasion, chemicals, and pinch points, so appropriate gloves are the key control. Other items may be needed for different hazards but do not address hand contact.

Question 10Occupational Safety, Health and Environmental Regulation

A driller is asked to work alone at night in a remote area with no communication coverage. Which requirement should be confirmed before accepting the task?

  1. That a reliable means of communication and a check-in schedule exist Correct answer.
  2. That the rig has been painted with reflective markings
  3. That the driller has a personal vehicle on site
  4. That the driller has completed a first-aid course in the last year

Explanation

Lone or remote work requires a reliable communication method and a defined check-in or monitoring arrangement so that assistance can be summoned. Without these, an incapacitating incident could go undetected.

Question 11Occupational Safety, Health and Environmental Regulation

What is the purpose of a permit-to-work system for hot work such as welding on the rig?

  1. To replace the need for a fire watch during welding
  2. To transfer responsibility for the fire risk to the client
  3. To record the welder's hourly rate for the project
  4. To formally authorise the task after confirming fire precautions and isolation Correct answer.

Explanation

A permit-to-work verifies that hazards have been assessed and controls such as fire watch, extinguishers, and isolation are in place before authorising the task. It does not remove the need for those controls or shift legal responsibility.

Question 12Occupational Safety, Health and Environmental Regulation

A driller hears a colleague describe a near miss where a wrench fell from the mast but struck no one. What is the correct response under incident reporting requirements?

  1. Record and report the near miss so the cause can be investigated Correct answer.
  2. Reprimand the colleague for wasting time
  3. Wait until a similar event causes injury before reporting
  4. Take no action because no injury occurred

Explanation

Near misses are reportable events because they reveal failures in controls that could cause serious harm. Reporting and investigating them allows corrective action before an injury occurs.

Question 13Occupational Safety, Health and Environmental Regulation

Which action best demonstrates the driller's duty to maintain a safe workplace regarding housekeeping on the rig floor?

  1. Storing lubricants in open buckets near the walkway
  2. Allowing mud to accumulate to reduce dust generation
  3. Clearing cables, tools, and debris from walkways and work areas Correct answer.
  4. Leaving tools where they are used until the shift ends

Explanation

Good housekeeping means keeping walkways and work areas clear of trip and slip hazards such as cables, tools, and debris. Accumulating mud or leaving tools in place creates additional hazards.

Question 14Occupational Safety, Health and Environmental Regulation

A driller is exposed to continuous rig noise measured above the action level. Which control hierarchy should be applied first?

  1. Rotate workers to limit individual exposure time
  2. Reduce noise at the source through engineering controls Correct answer.
  3. Issue hearing protection to all workers immediately
  4. Post signs warning of high noise areas

Explanation

The hierarchy of controls places elimination and engineering controls such as silencing or isolation ahead of administrative measures and PPE. Reducing noise at source protects everyone without relying on individual behaviour.

Question 15Occupational Safety, Health and Environmental Regulation

Before manually lifting a heavy drill component, which approach reflects correct manual handling technique?

  1. Bend at the waist and lift with a jerking motion
  2. Hold the load at arm's length to improve balance
  3. Twist the torso while lifting to place the load quickly
  4. Assess the load, keep it close, and lift with the legs while keeping the back straight Correct answer.

Explanation

Safe manual handling involves assessing the load, keeping it close to the body, and using the leg muscles while maintaining a neutral spine. Twisting or jerking during the lift increases the risk of musculoskeletal injury.

Question 16Occupational Safety, Health and Environmental Regulation

A driller observes that a subcontractor is working beneath a suspended load on the rig floor. What is the appropriate action?

  1. Ask the subcontractor to wear a hard hat and continue
  2. Stop the activity and ensure no one is under the suspended load Correct answer.
  3. Report it to the supervisor at the next weekly meeting
  4. Continue working and avoid the area yourself

Explanation

Working under a suspended load is a serious hazard that must be stopped immediately. The driller has a duty to intervene and ensure the area beneath the load is cleared.

Question 17Occupational Safety, Health and Environmental Regulation

What is the main function of a job safety analysis (JSA) before a drilling task?

  1. To identify task steps, hazards, and controls before work starts Correct answer.
  2. To replace the need for a work permit
  3. To calculate the cost of the drilling programme
  4. To record the driller's attendance for the shift

Explanation

A JSA breaks a task into steps and identifies the hazards and controls for each step before work begins. It is a planning tool and does not substitute for permits or other authorisations.

Question 18Occupational Safety, Health and Environmental Regulation

Which factor most affects the safe working load of a wire rope sling used on the rig?

  1. The colour of the sling's protective coating
  2. The rope diameter, construction, and condition Correct answer.
  3. The length of time the sling has been stored
  4. The name of the manufacturer stamped on the tag

Explanation

A sling's safe working load depends on its diameter, construction, and condition, as defined in the manufacturer's rating. Damage or wear reduces capacity regardless of the original rating.

Question 19Occupational Safety, Health and Environmental Regulation

A driller is instructed to use a piece of equipment that lacks a current inspection certificate. What is the correct course of action?

  1. Refuse to use it until it has been inspected and certified Correct answer.
  2. Use it because the supervisor gave a verbal instruction
  3. Use it only for light loads to reduce the risk
  4. Borrow a certificate from similar equipment on site

Explanation

Equipment without a current inspection certificate must not be used, regardless of verbal instructions. The driller has the right and duty to refuse unsafe work until the equipment is verified as fit for use.

Question 20Occupational Safety, Health and Environmental Regulation

Which statement correctly describes the driller's responsibility for environmental protection during drilling operations?

  1. The driller must prevent and report releases of drilling fluids and fuels Correct answer.
  2. Environmental compliance is optional if the site is remote
  3. Environmental duties apply only during daylight hours
  4. Environmental protection is solely the responsibility of the client's environmental officer

Explanation

Every worker, including the driller, shares responsibility for preventing pollution and reporting releases of fluids or fuels. Environmental duties do not depend on location or time of day.

Question 21Occupational Safety, Health and Environmental Regulation

A driller is working in extreme heat and begins to show confusion and hot dry skin. What should colleagues do first?

  1. Give the worker a hot drink and continue the shift
  2. Move the worker to a cool area, cool them actively, and seek medical help Correct answer.
  3. Cover the worker with a blanket to prevent chilling
  4. Advise the worker to rest briefly and return to work

Explanation

Confusion and hot dry skin suggest heat stroke, a medical emergency requiring immediate cooling and urgent medical attention. Continuing work or warming the worker would worsen the condition.

Question 22Occupational Safety, Health and Environmental Regulation

What is the correct way to store compressed gas cylinders on a drilling site?

  1. Lay them horizontally in an unventilated container
  2. Store them upright, secured, and separated by gas type with valves closed Correct answer.
  3. Store them near the rig floor for quick access during operations
  4. Leave regulators attached and valves open for immediate use

Explanation

Compressed gas cylinders must be stored upright and secured against falling, with valves closed and incompatible gases separated. Storage near ignition sources or with open valves creates serious fire and impact hazards.

Question 23Occupational Safety, Health and Environmental Regulation

During a toolbox talk, a driller is asked to explain the purpose of a lockout/tagout procedure for the rotary table. What is the most accurate description?

  1. It records who operated the equipment during the shift
  2. It speeds up maintenance by allowing the equipment to run slowly
  3. It transfers the maintenance task to the night shift
  4. It isolates hazardous energy and prevents unexpected start-up during maintenance Correct answer.

Explanation

Lockout/tagout isolates and secures hazardous energy sources so that equipment cannot start unexpectedly while maintenance or repair is performed. It does not permit slow operation or shift the task to others.

Question 24Occupational Safety, Health and Environmental Regulation

A driller notices that a safety guard on a rotating drive shaft has been removed for maintenance and not replaced. What is the most appropriate action?

  1. Place a warning cone near the shaft and continue work
  2. Operate the equipment carefully while the guard is missing
  3. Ask another worker to watch the shaft during operation
  4. Stop the equipment and arrange for the guard to be refitted before use Correct answer.

Explanation

Removing a guard exposes workers to entanglement in rotating machinery, so the equipment must be stopped until the guard is restored. Warnings or observers do not provide equivalent protection.

Question 25Occupational Safety, Health and Environmental Regulation

Which of the following best describes a driller's duty when a change in site conditions makes the approved work method unsafe?

  1. Apply the method only during the day shift
  2. Report the change after the task is completed
  3. Stop work, reassess the risk, and revise the method before continuing Correct answer.
  4. Continue with the approved method because it was previously authorised

Explanation

Risk assessment is continuous, and a change in conditions requires work to stop while the risk is reassessed and the method revised. Following an outdated approval would leave workers exposed to new hazards.

Question 26Occupational Safety, Health and Environmental Regulation

Under common occupational safety and health legislation, what is the primary duty placed on a driller as an employee during drilling operations?

  1. To certify the rig's pressure control equipment after each tour
  2. To take reasonable care of their own safety and that of others affected by their acts or omissions Correct answer.
  3. To purchase their own personal protective equipment before starting a shift
  4. To design the site emergency response plan for the drilling contractor

Explanation

Employees, including drillers, carry a general duty to take reasonable care for their own health and safety and for that of anyone else who may be affected by what they do or fail to do at work. This duty operates alongside the employer's broader obligation to provide a safe system of work, and it does not transfer design or certification responsibilities to the individual driller.

Question 27Occupational Safety, Health and Environmental Regulation

A driller is about to enter a mud tank compartment that has been sealed and unused for several days. Which precaution reflects accepted confined space practice before entry?

  1. Test the atmosphere for oxygen and toxic gases, then ventilate and use an attendant with rescue arrangements Correct answer.
  2. Enter quickly while holding breath to minimise exposure time
  3. Open the hatch for a few minutes and enter if no smell is detected
  4. Rely on a personal gas monitor worn by the previous shift and proceed without further testing

Explanation

Confined spaces such as mud tanks can accumulate hydrogen sulphide, hydrocarbons or oxygen-deficient atmospheres, so the atmosphere must be tested before entry, ventilation provided, and an attendant plus rescue plan kept in place. A sealed tank that has stood for days is exactly the situation where dangerous gas can build up unnoticed.

Question 28Occupational Safety, Health and Environmental Regulation

Which document should a driller consult to identify the correct emergency shutdown sequence and contact numbers for a well control event on the rig?

  1. The rig-specific emergency response plan Correct answer.
  2. The drilling fluid daily recap sheet
  3. The supplier's lubricant data sheet
  4. The tour attendance roster

Explanation

The rig-specific emergency response plan sets out the recognised procedures, alarm signals, shutdown steps and contact details for events such as a kick or blowout. Fluid recaps, product data sheets and rosters serve operational or administrative purposes and do not contain emergency command information.

Question 29Occupational Safety, Health and Environmental Regulation

A driller is asked to move a load with the rig's crane, but the lift plan shows the load will pass over a walkway used by the night crew. What is the correct response under lifting and suspended load rules?

  1. Stop the lift and have the walkway closed or the route changed before any movement Correct answer.
  2. Proceed if the crane operator sounds a warning horn before each movement
  3. Ask a banksman to wave pedestrians through during the lift
  4. Proceed only if the load is kept below head height while crossing

Explanation

Lifting operations must be planned so that suspended loads are not carried over people, and where a route crosses a walkway the area must be closed or the lift re-planned. Warning signals or a banksman do not make it acceptable to move a load above personnel who are not part of the lift.

Question 30Occupational Safety, Health and Environmental Regulation

A driller reviews an incident where a floorhand's glove was caught by a rotating pipe joint, causing a hand injury. Which analysis best identifies the underlying cause in line with incident investigation principles?

  1. The task design allowed loose clothing or gloves near an unguarded rotating joint, so engineering and procedural controls are needed Correct answer.
  2. The glove was the wrong colour for the crew
  3. The floorhand was careless, so no further action is required
  4. The incident should be recorded only as a near miss to avoid regulatory reporting

Explanation

Proper incident investigation looks beyond individual blame to the underlying causes, such as inadequate guarding, poor task design or missing procedures, and then applies controls following the hierarchy of controls. Blaming the worker or the colour of equipment stops the investigation before the real system failures are corrected.

Question 31Drilling Equipment, Components and Inspection

On a rotary drilling rig, which component transfers the rotating motion from the rotary table to the drill string?

  1. The crown block
  2. The dead line anchor
  3. The swivel
  4. The kelly Correct answer.

Explanation

The kelly is the square or hexagonal pipe that passes through the rotary table bushing and transmits torque to the drill string while allowing vertical movement. The swivel hangs above and allows rotation while carrying mud, and the crown block is a stationary sheave assembly at the top of the mast.

Question 32Drilling Equipment, Components and Inspection

During a pre-tour inspection you find deep, evenly spaced grooves worn into the drum of the draw works. What is the most likely cause?

  1. Low air pressure in the brake actuator
  2. Excessive crown clearance
  3. A worn rotary table bushing
  4. Drilling line spooling under insufficient tension Correct answer.

Explanation

Grooving on the drum usually results from the drilling line being spooled with too little tension, so successive wraps cut into the same location instead of laying evenly. Correct spooling tension and periodic slip-and-cut of the line prevent this damage.

Question 33Drilling Equipment, Components and Inspection

What is the primary purpose of the blowout preventer (BOP) stack on a drilling rig?

  1. To cool the drilling fluid returning from the annulus
  2. To align the kelly with the rotary table
  3. To measure the weight of the drill string
  4. To seal the wellbore and control formation pressure Correct answer.

Explanation

The BOP stack provides a means to close off the wellbore and control pressures from the formation, protecting personnel and equipment from uncontrolled flow. It is not a measuring or cooling device.

Question 34Drilling Equipment, Components and Inspection

A driller notices that the weight indicator shows a gradual increase in string weight while the blocks are stationary and the bit is off bottom. Which condition should be investigated first?

  1. The rotary table is turning too slowly
  2. The crown block is overloaded
  3. The mud pumps are running too fast
  4. The string may be sticking in the hole Correct answer.

Explanation

A rising string weight with the bit off bottom suggests the drill string is becoming stuck or differentially pressured against the formation. The driller should stop and investigate before applying additional load.

Question 35Drilling Equipment, Components and Inspection

Which drilling line component is anchored to the substructure and does not move during hoisting operations?

  1. The fast line
  2. The deadline sheave
  3. The traveling line
  4. The dead line Correct answer.

Explanation

The dead line is the end of the drilling line secured to the anchor and remains stationary while the fast line moves with the traveling block. The fast line travels to the drawworks drum and moves during hoisting.

Question 36Drilling Equipment, Components and Inspection

A candidate is inspecting a wire rope drilling line and finds broken wires concentrated in one lay length. What action is appropriate?

  1. Record the count against the removal criteria and plan a slip-and-cut Correct answer.
  2. Ignore them because broken wires are normal
  3. Add grease and continue without record
  4. Increase the hoisting speed to reduce load

Explanation

Broken wires in a concentrated area are counted over a lay length and compared with the rope's removal criteria; if limits are approached, the line is slipped and cut to move the damaged section away from the drum and sheaves. Documenting the count supports trend monitoring.

Question 37Drilling Equipment, Components and Inspection

What does the term 'rated capacity' mean for a shackle used in drilling rig lifting operations?

  1. The load at which the shackle begins to deform
  2. The maximum load the manufacturer guarantees the shackle can safely carry Correct answer.
  3. The weight of the shackle itself
  4. The maximum load the shackle can carry before the pin shears

Explanation

Rated capacity, or working load limit, is the maximum load the manufacturer certifies the shackle can safely carry under stated conditions. It is deliberately below the load that would cause permanent deformation or failure.

Question 38Drilling Equipment, Components and Inspection

During a trip, the driller observes that the traveling block is approaching the crown block faster than expected. What is the correct immediate action?

  1. Continue hoisting and monitor the weight indicator
  2. Activate the crown-o-matic or anti-collision device and apply the brake Correct answer.
  3. Signal the derrickman to climb the mast
  4. Increase the throttle to clear the blocks quickly

Explanation

The anti-collision device, often called a crown-o-matic, is designed to slow or stop hoisting before the traveling block strikes the crown. The driller should also apply the brake immediately to prevent a crown block collision.

Question 39Drilling Equipment, Components and Inspection

Which component of the circulating system removes large cuttings from the returning drilling fluid before it reaches the shale shaker screens?

  1. The desander cone
  2. The mud pump
  3. The gumbo box or possum belly Correct answer.
  4. The standpipe

Explanation

The gumbo box or possum belly is a settling compartment in the flowline that removes large cuttings and gumbo before the fluid reaches the shaker. Desanders and desilters remove finer solids downstream.

Question 40Drilling Equipment, Components and Inspection

A driller is checking the rotary table bushing and finds the kelly drive rollers seized. What is the most likely operational consequence?

  1. The BOP will fail to close
  2. The weight indicator will read zero
  3. The kelly may not rotate freely, causing uneven torque and wear Correct answer.
  4. The mud pump will lose suction

Explanation

Seized kelly drive rollers prevent the kelly from rotating smoothly in the bushing, producing uneven torque transmission and accelerated wear on the kelly and bushing. The bushing should be serviced or replaced before drilling resumes.

Question 41Drilling Equipment, Components and Inspection

What is the function of the traveling block in the hoisting system?

  1. To anchor the drilling line to the substructure
  2. To provide the moving sheave assembly that multiplies line pull Correct answer.
  3. To rotate the drill string
  4. To store drilling fluid

Explanation

The traveling block is the moving sheave assembly suspended from the crown block; together they form a block-and-tackle system that multiplies the drawworks line pull. It moves vertically with the hook and elevator load.

Question 42Drilling Equipment, Components and Inspection

A driller notices the mud pump pressure gauge shows a sudden sharp increase while pump rate stays constant. Which cause is most consistent with this observation?

  1. A drop in mud weight
  2. A partial blockage or washout restriction in the circulating system Correct answer.
  3. An increase in drill string rotation
  4. A decrease in bit weight

Explanation

A sudden pressure rise at constant pump rate indicates increased resistance in the circulating path, such as a plugged nozzle or partial blockage. The driller should investigate before continuing to pump.

Question 43Drilling Equipment, Components and Inspection

Which inspection item is most important for the safety of an elevator used to handle drill pipe?

  1. The paint color of the elevator body
  2. The manufacturer's logo
  3. The weight of the elevator
  4. The condition of the latch and latch spring Correct answer.

Explanation

The latch and latch spring keep the elevator closed around the pipe; a worn or weak latch can allow the pipe to slip out under load. Inspectors should verify latch function, spring tension, and hinge condition.

Question 44Drilling Equipment, Components and Inspection

A driller observes that the rotary torque gauge shows a steady increase while weight on bit and rotary speed are unchanged. What is the most likely explanation?

  1. The mud pump has lost prime
  2. The kelly is out of the bushing
  3. The crown block is misaligned
  4. The bit or stabilizer is encountering a tighter or more resistive formation Correct answer.

Explanation

Rising torque at constant weight and rpm usually indicates increased resistance from the formation, such as a tighter hole section or a stabilizer hanging up. The driller should monitor for stick-slip and adjust parameters accordingly.

Question 45Drilling Equipment, Components and Inspection

What is the purpose of the rotary hose on a conventional rotary rig?

  1. To support the weight of the drill string
  2. To measure the return mud flow rate
  3. To transmit rotary torque to the kelly
  4. To carry pressurized drilling fluid from the standpipe to the swivel Correct answer.

Explanation

The rotary hose is a flexible high-pressure line that delivers drilling fluid from the standpipe to the swivel while allowing the traveling block to move. It is not a load-bearing or torque-transmitting member.

Question 46Drilling Equipment, Components and Inspection

During a BOP function test, the annular preventer closes slowly and the closing pressure drops below the recommended value. Which item should be checked first?

  1. The accumulator pressure and closing unit Correct answer.
  2. The shale shaker screen size
  3. The weight indicator calibration
  4. The rotary table bushing

Explanation

Slow closure and low closing pressure point to inadequate hydraulic supply or a leak in the closing circuit, so accumulator pressure and the closing unit should be checked first. The annular preventer relies on stored hydraulic energy to close.

Question 47Drilling Equipment, Components and Inspection

Which condition on a drilling line indicates that the line should be slipped and cut even if wire break counts are below the removal limit?

  1. Normal surface lubrication
  2. Severe corrosion or crushing in a localized section Correct answer.
  3. Even wear along the entire length
  4. Slight discoloration from grease

Explanation

Localized severe corrosion, crushing, or kinking can weaken the rope regardless of wire break count and justifies slipping and cutting the affected section out of the wear zone. The damaged section should be moved away from drum and sheave contact points.

Question 48Drilling Equipment, Components and Inspection

What is the primary function of the crown block on a drilling rig?

  1. To rotate the drill string
  2. To control the mud return flow
  3. To store the drill line
  4. To provide the fixed sheave assembly at the top of the mast Correct answer.

Explanation

The crown block is the stationary sheave assembly mounted at the top of the mast; it works with the traveling block to form the block-and-tackle hoisting system. It does not rotate the string or store line.

Question 49Drilling Equipment, Components and Inspection

A driller is inspecting a hook and finds the safety latch does not fully close. Why is this a concern?

  1. The latch carries the full weight of the string
  2. The latch prevents the load from slipping out of the hook under slack conditions Correct answer.
  3. The latch provides hydraulic pressure to the BOP
  4. The latch measures hook load

Explanation

The hook safety latch keeps slings, elevators, and links from slipping off the hook when the load is slack or when the hook is being positioned. A latch that does not close properly increases the risk of dropping the load.

Question 50Drilling Equipment, Components and Inspection

Which device is used to measure and display the weight of the drill string hanging from the traveling block?

  1. The weight indicator Correct answer.
  2. The torque gauge
  3. The flow indicator
  4. The pump stroke counter

Explanation

The weight indicator displays the load on the hook and drill string, typically derived from a hydraulic deadline anchor or load cell. It helps the driller monitor string weight, weight on bit, and overpull.