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Question 1. What is the primary purpose of conducting a site evaluation before operating a digger derrick? A) To determine the best brand of equipment to use B) To assess potential hazards such as overhead and underground utilities, unstable ground, and uneven terrain C) To estimate the total project cost D) To schedule personnel shifts Answer: B Explanation: Site evaluation aims to identify hazards like utilities, unstable ground, and terrain issues to ensure safe operation and prevent accidents. Question 2. Which federal regulation is most relevant to the safety standards for digger derrick operation? A) OSHA 1910 B) OSHA 1926 Subpart CC C) EPA regulations D) DOT regulations Answer: B Explanation: OSHA 1926 Subpart CC specifically covers safety standards for utility construction, including digger derrick operations. Question 3. During a job briefing, what should be included? A) Work procedures, hazards, emergency plans, and personnel roles B) Personal opinions about the project C) Detailed financial analysis of the project D) Equipment sales pitches Answer: A Explanation: Job briefings should cover work procedures, hazards, emergency plans, and roles to ensure everyone understands safety protocols. Question 4. Which communication method is considered standard for signaling operators during crane or derrick operations? A) Verbal shouting only B) Hand signals according to ANSI/ASSE A10.31 standards C) Whistles only D) Flashing lights only Answer: B Explanation: Standardized hand signals per ANSI/ASSE A10.31 ensure clear communication between the operator and ground personnel. Question 5. What is a critical part of pre-operational inspection of a digger derrick? A) Checking the color of the vehicle B) Inspecting controls, safety devices, structural integrity, and rigging for deficiencies C) Testing the radio for entertainment quality D) Verifying the vehicle’s stereo system Answer: B Explanation: Pre-operation inspections focus on controls, safety devices, structure, and rigging to identify potential issues that could compromise safety.
Question 6. Why is it important to understand decals and placards on a digger derrick? A) To know the vehicle's maintenance schedule B) To ensure the operator adheres to safety warnings and load limits C) To identify the manufacturer’s logo D) To decorate the equipment Answer: B Explanation: Decals and placards convey critical safety information, including load limits and warnings, essential for safe operation. Question 7. Which PPE is essential when working around electrical hazards with a digger derrick? A) Insulated gloves and tools, fall protection, and safety glasses B) Regular work gloves only C) Cotton t-shirts and jeans D) Sandals and sunglasses Answer: A Explanation: Insulated PPE and fall protection are necessary to protect against electrical hazards and falls during operations near energized lines. Question 8. Proper setup of a digger derrick includes which of the following? A) Positioning the vehicle on uneven ground without cribbing B) Using outriggers, cribbing, or mats to stabilize the vehicle on level ground C) Leaving outriggers retracted during operation D) Parking on soft soil without stabilization Answer: B Explanation: Proper setup involves stabilizing the vehicle using outriggers and cribbing or mats to ensure a stable working platform. Question 9. How can weather conditions affect digger derrick operations? A) They have no impact on safety or load capacity B) Wind, ice, and snow can reduce stability and load limits, increasing risk C) Only rain affects operation, not other weather D) Weather only impacts the color of safety gear required Answer: B Explanation: Adverse weather like wind, ice, or snow can compromise stability and safety, requiring operators to adjust or cease operations. Question 10. Which component of a digger derrick is primarily responsible for lifting loads? A) The engine B) The boom and winch system C) The tires D) The operator’s seat Answer: B Explanation: The boom and winch system are directly responsible for lifting and maneuvering loads during operation. Question 11. What is the purpose of a load moment indicator (LMI)? A) To display weather conditions B) To monitor the load's weight and the boom's angle to prevent overloading C) To track operator working hours D) To control the vehicle’s speed
Question 17. How does side loading affect the load on a digger derrick? A) It reduces the load on the equipment B) It increases the risk of structural failure if not properly managed C) It has no effect on the load or safety D) It only affects the operator’s comfort Answer: B Explanation: Side loading can create uneven stresses, increasing the risk of structural failure if not properly controlled with rigging and operational techniques. Question 18. What is a primary reason for conducting a thorough inspection of rigging before use? A) To verify the rigging’s color matches the equipment B) To ensure rigging is free of damage, properly rated, and correctly installed for safe lifting C) To check if rigging will fit into storage D) To verify the rigging’s manufacturer’s logo Answer: B Explanation: Proper rigging inspection ensures safety by verifying integrity, rating, and correct installation to prevent load drops or accidents. Question 19. Why is it important to use insulated tools when working around electrical lines? A) To avoid electrical shock and arc flash hazards B) To keep the tools clean C) To improve work speed D) To protect against mechanical damage Answer: A Explanation: Insulated tools prevent electrical shocks and reduce the risk of arc flashes when working near energized conductors. Question 20. Which of the following best describes the purpose of a job hazard analysis (JHA)? A) To estimate project costs B) To identify potential hazards and establish control measures before starting work C) To assign work shifts among personnel D) To decide on equipment brands to purchase Answer: B Explanation: A JHA systematically identifies hazards and develops safety controls to prevent accidents during operations. Question 21. What is the main function of outriggers during digger derrick setup? A) To increase the speed of operation B) To stabilize the vehicle and prevent tipping during lifting operations C) To improve fuel efficiency D) To lift the vehicle off the ground for maintenance Answer: B Explanation: Outriggers provide lateral stability, preventing tipping and ensuring safe lifting during operation. Question 22. When is it necessary to use cribbing or mats during setup? A) Always, regardless of ground conditions B) Only when working on unstable or soft ground to provide a level and stable base C) Only during winter operations D) Only when the equipment is new
Answer: B Explanation: Cribbing or mats are used on unstable or soft ground to distribute weight and prevent sinking or tipping. Question 23. Which component of the digger derrick helps prevent the boom from moving unexpectedly during operation? A) The control panel B) The anti-two-block device C) The operator’s seatbelt D) The vehicle horn Answer: B Explanation: The anti-two-block device prevents the hook block from contacting the boom tip, avoiding boom damage or accidents. Question 24. What should be checked during a daily pre-start inspection of the digger derrick? A) Tire pressure, controls, safety devices, structural integrity, and fluid levels B) The radio station presets C) The color of the vehicle paint D) The vehicle’s interior cleanliness Answer: A Explanation: Daily inspections ensure all critical components, safety devices, and fluid levels are in proper condition for safe operation. Question 25. Why is knowledge of OSHA 1926 Subpart CC essential for digger derrick operators? A) It provides guidance on environmental regulations B) It establishes safety and operational standards specific to utility construction equipment C) It contains instructions for vehicle maintenance D) It determines the scheduling of work shifts Answer: B Explanation: OSHA 1926 Subpart CC sets safety standards for utility construction, including proper operation and safety procedures for digger derricks. Question 26. How can environmental conditions like wind impact load lifting with a digger derrick? A) Wind has no effect on lifting operations B) Wind can cause load sway and instability, requiring operation adjustments or suspension C) Wind only affects the operator’s visibility, not safety D) Wind makes lifting easier by stabilizing the load Answer: B Explanation: Wind can sway loads, destabilize the boom, and increase the risk of accidents, so operations may need to be adjusted or halted. Question 27. Which is a key factor in determining the safe load capacity of a digger derrick? A) The color of the equipment B) The boom angle and the equipment’s load chart limits C) The operator’s experience only D) The time of day Answer: B Explanation: Load capacity depends on factors like boom angle, length, and load chart restrictions to prevent overloading.
Explanation: Dynamic loading, such as swinging or sudden movements, can increase stress on the equipment and must be considered in load limits. Question 34. Which safety device prevents the hook block from contacting the boom tip? A) The load moment indicator B) The anti-two-block device C) The emergency stop button D) The hydraulic pressure relief valve Answer: B Explanation: The anti-two-block device prevents the hook block from contacting the boom tip, avoiding boom damage or failure. Question 35. What is the primary reason for performing a visual inspection of the boom and structural components before operation? A) To check for cosmetics and cleanliness B) To identify any cracks, deformities, or damage that could compromise safety C) To verify paint color matches company standards D) To ensure the equipment looks new Answer: B Explanation: Visual inspections detect structural damage that could lead to failure during operation, preventing accidents. Question 36. How should an operator respond if environmental conditions such as wind or ice make lifting unsafe? A) Proceed with caution B) Suspend operations until conditions improve C) Continue working at reduced speed D) Only lift lighter loads without stopping Answer: B Explanation: Unsafe environmental conditions should trigger suspension of operations to prevent accidents or equipment failure. Question 37. Which of the following best describes the purpose of a job site safety plan? A) To outline safety procedures, hazard controls, and emergency responses before work begins B) To document employee work hours C) To record equipment purchase details D) To plan the project timeline only Answer: A Explanation: A safety plan ensures hazards are identified and controls are established to protect workers and equipment. Question 38. When operating a digger derrick near underground utilities, what is a critical step? A) Assume all underground lines are marked and safe B) Call for utility locates and verify the location of underground utilities before digging or lifting C) Ignore underground utilities if they are not visible D) Dig randomly to find underground lines Answer: B Explanation: Verifying underground utility locations prevents accidental strikes, which can cause injuries and service disruptions.
Question 39. How does proper use of outriggers influence the stability of the digger derrick? A) It makes the vehicle move faster B) It prevents tipping and ensures safe lifting capacity C) It reduces fuel consumption D) It improves the vehicle’s appearance Answer: B Explanation: Proper outrigger deployment stabilizes the vehicle, preventing tipping during lifting or positioning. Question 40. What should be done if a load begins to sway during lifting? A) Continue lifting cautiously B) Use tag lines and stabilize the load before proceeding C) Lower the load immediately without communication D) Ignore the sway and proceed with the lift Answer: B Explanation: Stabilizing loads with tag lines prevents swinging, promoting safer and more controlled placement. Question 41. Which factor most influences the maximum allowable load when operating a digger derrick? A) The operator’s experience level B) The boom angle and length, as specified in load charts C) The color of the equipment D) The time of day Answer: B Explanation: Load charts specify maximum loads based on boom angle and length to prevent overloading. Question 42. What is the purpose of a daily equipment inspection log? A) To track the hours worked for payroll B) To document inspections, deficiencies, and repairs for safety compliance C) To record fuel consumption only D) To log employee lunch breaks Answer: B Explanation: Inspection logs ensure ongoing safety by documenting conditions and maintenance needs. Question 43. When should the operator perform a function test of controls before starting work? A) Only when the equipment is new B) During the pre-operational inspection to verify controls are functioning properly C) After completing the work for the day D) Only if there are visible issues Answer: B Explanation: Function tests ensure controls respond correctly, preventing operational failures during work. Question 44. Why is it important to follow manufacturer load charts and operational limits? A) To comply with legal requirements and prevent overloading, equipment damage, and accidents B) To increase work speed C) To reduce fuel consumption
B) Adjust rigging or reposition the load to ensure it is balanced before lifting C) Continue lifting regardless of imbalance D) Lower the load immediately and abandon the lift Answer: B Explanation: Properly balanced loads prevent swinging, tipping, and equipment stress. Question 51. What is the main reason for checking the condition of safety decals and placards before operating a digger derrick? A) To ensure they are visually appealing B) To confirm they are present and legible for safety information and load limits C) To see if they match the vehicle color D) To verify the manufacturer’s logo is visible Answer: B Explanation: Decals and placards provide critical safety and load information; verifying their visibility ensures proper adherence to safety standards. Question 52. When is it appropriate to perform a test lift with a load on the boom? A) After the work is completed B) Before starting the job, to verify operation and load handling capabilities C) Only when the operator feels confident D) During bad weather conditions only Answer: B Explanation: Conducting a test lift before work begins helps verify safe operation and load handling under current conditions. Question 53. Which of the following is a key consideration when working in cold weather conditions? A) Use of winter-rated hydraulic fluids and inspecting for ice buildup B) Changing the equipment’s color for visibility C) Disabling safety devices for faster operation D) Removing all PPE for comfort Answer: A Explanation: Cold weather can affect hydraulic fluids and equipment operation; proper fluids and ice removal are essential for safety. Question 54. How can improper rigging impact load handling? A) It can cause the load to sway, shift, or fall, risking injury and equipment damage B) It makes lifting faster C) It improves load stability D) It has no impact if the load is light Answer: A Explanation: Incorrect rigging compromises load security, increasing the risk of accidents and damage. Question 55. What is the primary function of a boom angle indicator? A) To measure the height of the operator B) To show the boom's current angle relative to the ground for safe lifting limits C) To measure wind speed D) To control the vehicle’s speed Answer: B
Explanation: The boom angle indicator helps ensure lifts stay within safe operational limits based on the boom’s position. Question 56. When operating near a power line, what is the minimum approach distance if the line is energized at 50 kV? A) 10 feet B) 10 inches C) 10 meters D) 50 feet Answer: A Explanation: OSHA guidelines specify minimum approach distances that vary with voltage; typically, 10 feet for lines energized at 50 kV. Question 57. Why is it essential to use a spotter or signalperson during lifting operations? A) To help with equipment maintenance B) To provide clear communication and maintain safe distances, especially near hazards C) To operate the controls remotely D) To supervise the operator’s break time Answer: B Explanation: Signalpersons coordinate lifts, ensure safety, and keep personnel clear of hazards. Question 58. What should be done if the load begins to sway excessively during lifting? A) Continue lifting to complete the task quickly B) Stop lifting, stabilize the load using tag lines, and reassess the rigging C) Lower the load immediately without communication D) Speed up the lift to reduce sway Answer: B Explanation: Excessive sway indicates instability; stopping and stabilizing prevents accidents or load drops. Question 59. Which component is responsible for preventing the boom from exceeding its maximum safe extension? A) The control panel B) The boom extension limit switch C) The operator’s brake pedal D) The vehicle’s speed limiter Answer: B Explanation: The extension limit switch automatically stops boom extension at the safe maximum length. Question 60. What is a safe practice when working on a sloped or uneven terrain? A) Level the vehicle using outriggers and cribbing before lifting B) Proceed without stabilization if the slope is minor C) Operate only during daylight hours to see better D) Lift loads only on the downhill side of the slope Answer: A Explanation: Stabilizing the vehicle on slopes with outriggers and cribbing prevents tipping and maintains safety.
C) To record operational hours D) To estimate fuel consumption Answer: B Explanation: Load charts specify safe lifting limits based on boom position to prevent overloading. Question 67. What should be the first action if an emergency occurs during lifting operations? A) Continue working cautiously B) Stop the operation immediately and follow emergency procedures C) Attempt to fix the problem while lifting D) Notify the project manager at the end of the shift Answer: B Explanation: Immediate stopping and following emergency protocols are crucial to prevent injury and further damage. Question 68. Which of the following best describes proper rigging for overhead lifting? A) Using rigging components rated for the load and inspecting for damage before use B) Using any available rigging regardless of condition C) Rigging only for aesthetic purposes D) Combining different rigging types without regard to load limits Answer: A Explanation: Proper rigging involves rated, inspected components correctly installed to ensure secure and safe lifts. Question 69. When is it appropriate to disconnect the load from the rigging? A) After the load is safely placed and the crane or derrick is stable B) Before the load is lowered onto the ground C) During the lift to adjust rigging D) Only if the load is light Answer: A Explanation: Disconnect after the load is secure and safely supported to prevent accidental drops or swings. Question 70. What is a key safety feature of the anti-two-block device? A) Prevents the hook from contacting the boom tip, avoiding boom damage or failure B) Automatically stops the engine if overloaded C) Limits the maximum load weight D) Turns on the safety lights automatically Answer: A Explanation: The anti-two-block device prevents the hook block from contacting the boom tip, reducing the risk of boom failure. Question 71. Why is it essential to perform a hydraulic system check before starting a lift? A) To verify hydraulic pressure and check for leaks or damage in hoses and fittings B) To test the radio communication systems C) To ensure the engine starts smoothly D) To measure hydraulic fluid color for contamination Answer: A Explanation: Hydraulic checks ensure system integrity, preventing failures during lifting operations.
Question 72. How should an operator respond if they notice abnormal noise or vibration during operation? A) Continue working cautiously B) Cease operation, investigate, and report the issue before resuming C) Ignore if the equipment appears to be functioning D) Increase speed to finish quickly Answer: B Explanation: Abnormal noise or vibration indicates potential mechanical issues that must be addressed to prevent failure. Question 73. Which safety device helps prevent the boom from exceeding the maximum rated angle? A) The boom angle indicator and limit switch B) The load chart C) The vehicle’s speed control D) The operator’s seatbelt Answer: A Explanation: The boom angle indicator and limit switch restrict boom movement within safe angles. Question 74. Why is it important to secure the work zone with barricades or warning signs? A) To prevent unauthorized personnel from entering hazardous areas and to alert others of ongoing lifting activities B) To increase visibility for the operator C) To comply with aesthetic standards D) To mark the construction boundary only Answer: A Explanation: Barricades and signs restrict access, reducing the risk of accidents involving bystanders or unauthorized personnel. Question 75. When should a qualified person conduct periodic inspections of the digger derrick? A) Every six months or as required by safety standards B) Only after an accident C) Only if the equipment looks dirty D) Once a year regardless of usage Answer: A Explanation: Regular inspections by qualified personnel ensure ongoing safety and compliance with regulations. Question 76. How does proper load rigging prevent load slippage or dropping? A) By ensuring rigging is rated, properly attached, and free of damage or defects B) By using makeshift rigging components C) By attaching rigging loosely for flexibility D) By stacking multiple rigging layers for safety Answer: A Explanation: Correct, rated rigging and secure attachment prevent slippage and ensure safe lifting. Question 77. What is the recommended action if a load is unstable during lifting? A) Continue the lift carefully B) Lower the load and re-rig or reposition to ensure stability before proceeding C) Proceed with caution regardless of instability
Question 83. When operating a digger derrick, how should the operator respond to a sudden power failure? A) Continue operation cautiously B) Cease operation immediately, secure the load, and follow emergency procedures C) Restart the equipment and proceed D) Lower the load quickly to the ground without concern Answer: B Explanation: Immediate shutdown and following emergency procedures prevent accidents caused by power failure. Question 84. How do overload conditions affect the digger derrick's components? A) They cause no damage if the operator is experienced B) They can lead to mechanical failure, equipment damage, or tipping C) They only affect the engine’s fuel efficiency D) They improve lifting capacity temporarily Answer: B Explanation: Overloading stresses components beyond their rated limits, risking failure or tipping. Question 85. Why is it important to verify the load weight before lifting? A) To ensure it does not exceed the rated capacity and to plan for safe lifting B) To see if the load looks heavy enough C) To match the load to the operator’s strength D) To determine if the load needs to be painted Answer: A Explanation: Verifying weight prevents overloading and ensures safe lift planning. Question 86. What is a critical step after completing a lift with a digger derrick? A) Leave the equipment as is for the next day B) Lower the load, secure the equipment, and perform post-operation inspections C) Remove all safety devices D) Clean the entire vehicle and equipment only Answer: B Explanation: Proper post-operation procedures include lowering loads safely and inspecting the equipment for damage. Question 87. How does the operator ensure they are within the safe working load during a lift? A) By consulting load charts and using the load moment indicator B) By estimating the load visually C) By guessing based on experience D) By lifting as much as possible to test capacity Answer: A Explanation: Using load charts and LMIs ensures the load stays within safe limits. Question 88. When should the operator conduct a visual inspection of the load before lifting? A) Only if the load appears unstable B) Before each lift to check for secure rigging and proper attachment C) Only when lifting heavy loads D) Only at the end of the shift Answer: B Explanation: Visual inspection before each lift confirms rigging is secure and the load is safe to lift.
Question 89. What is the primary safety concern when lifting loads over personnel or occupied work areas? A) It enhances productivity B) It risks injury or fatality from dropped loads or swinging loads C) It is acceptable if the load is light D) It speeds up the job process Answer: B Explanation: Lifting over people or occupied areas poses a serious safety risk and should be avoided. Question 90. Why is it important to maintain a safe distance from energized power lines during lifting? A) To prevent electrical contact, arcing, and electrocution B) To avoid damage to the vehicle’s paint C) To keep the work area visually clear D) To prevent noise disturbances Answer: A Explanation: Maintaining safe distances prevents electrical hazards, injuries, and equipment damage. Question 91. How do weather conditions like snow or ice influence the setup of a digger derrick? A) They make setup easier B) They can cause slippery surfaces, reducing stability, and may require additional precautions C) They have no impact on safety or setup D) They improve visibility for the operator Answer: B Explanation: Snow and ice create slip hazards and unstable ground, requiring additional safety measures. Question 92. What is the purpose of a load chart in conjunction with the load moment indicator? A) To provide detailed weather forecasts B) To help the operator determine the maximum safe load at specific boom angles and lengths C) To track equipment usage hours D) To record fuel consumption Answer: B Explanation: Load charts specify safe lifting capacities based on boom position, complementing LMIs. Question 93. When working in a confined area, what is a recommended practice? A) Use the smallest possible crane or derrick B) Plan the lift carefully, ensure sufficient clearance, and use spotters if necessary C) Proceed without planning to save time D) Lift only during nighttime for better visibility Answer: B Explanation: Proper planning and clearance are crucial to prevent accidents in confined spaces. Question 94. How should the operator handle an unexpected mechanical failure during a lift? A) Continue lifting cautiously B) Cease operation immediately, secure the load, and report the issue for repair C) Attempt to fix it while the load is suspended D) Lower the load and ignore the failure
D) To track employee attendance Answer: A Explanation: Daily checklists verify equipment safety and readiness for operation. Question 101. How should the operator respond if a load begins to drift or swing uncontrollably during lifting? A) Continue lifting to finish quickly B) Stop lifting, stabilize the load with tag lines, and reassess rigging and balance C) Lower the load rapidly to the ground without communication D) Increase load weight to counteract sway Answer: B Explanation: Stabilizing and reassessing prevent accidents and ensure safe load handling. Question 102. Why is it important to calibrate load moment indicators regularly? A) To maintain accuracy in load and boom angle readings for safe lifting limits B) To improve fuel efficiency C) To update the software only D) To match the operator’s preferences Answer: A Explanation: Proper calibration ensures LMIs provide accurate data, critical for safe operations. Question 103. What is the significance of a "tag line" during lifting operations? A) To measure the length of the load B) To control and guide the load, especially in windy conditions or tight spaces C) To decorate the load D) To serve as a backup rigging line Answer: B Explanation: Tag lines help ground personnel control load movement and prevent swinging or spinning. Question 104. When setting up a digger derrick, what is the primary purpose of leveling the vehicle? A) To ensure the vehicle looks straight B) To prevent tipping and ensure safe operation during lifting C) To make loading easier D) To improve fuel consumption Answer: B Explanation: Proper leveling stabilizes the vehicle, preventing tipping during lifts. Question 105. How does the operator verify that the load is properly rigged before lifting? A) By visual inspection, ensuring rigging is rated, secure, and balanced B) By relying solely on the rigging manufacturer’s label C) By feeling the weight manually D) By listening to the rigging for sounds Answer: A Explanation: Visual inspection ensures rigging integrity and proper attachment for safe lifting. Question 106. Why is it necessary to perform a function test of the controls before starting work? A) To familiarize the operator with control responses and ensure they operate correctly B) To check the radio volume C) To adjust the seat position
D) To test the air conditioning system Answer: A Explanation: Function testing verifies controls work properly, preventing operational failures. Question 107. How should the operator handle a situation where the load is too heavy for the current boom angle? A) Proceed with lifting cautiously B) Reassess using load charts, adjust boom angle or rigging, or reduce the load C) Use brute force to lift anyway D) Lift the load higher before moving Answer: B Explanation: Adjusting the lift plan prevents overloading and potential failure. Question 108. What is the importance of inspecting the hydraulic hoses and fittings regularly? A) To ensure they are clean and shiny B) To prevent hydraulic leaks or failures that could cause operational hazards C) To check for color matching with equipment D) To maintain aesthetic appearance only Answer: B Explanation: Regular inspection prevents leaks and hydraulic failures that could cause accidents. Question 109. When working in a noisy environment, what additional safety measure should be taken? A) Use hearing protection and maintain clear communication B) Work faster to finish quickly C) Turn off all safety devices to reduce noise D) Work without PPE to stay aware of surroundings Answer: A Explanation: Hearing protection prevents hearing loss, and clear communication ensures safety despite noise. Question 110. Why should all personnel involved in lifting operations be trained and certified? A) To comply with legal requirements and ensure safe, competent operations B) To increase the speed of work C) To reduce the number of workers needed D) To satisfy insurance paperwork only Answer: A Explanation: Certification ensures personnel understand safety procedures and operate equipment correctly. Question 111. How does the use of a spotter improve safety during lifting? A) It allows the operator to focus on driving B) It provides visual guidance, ensures clear signals, and monitors hazards in the work zone C) It replaces the need for safety devices D) It helps with equipment maintenance Answer: B Explanation: Spotters assist in communication and hazard awareness, reducing risks. Question 112. When should the operator engage the vehicle’s parking brake? A) During operation to prevent movement
