Construction cranes
Study mode
Question of 121
1. A technical device subject to technical supervision may be operated on the basis of
a) oral or written permission issued by an authorized conservator
b) a valid decision allowing operation issued by the relevant technical supervision authority
c) the CE marking placed on the deviced) a declaration of conformity issued by the manufacturer2. Which of the listed activities does not fall within the responsibilities of the UTB operator
a) performing minor repairs of the device within the scope of their education and skills
b) following the operation instructions regarding the operation of the UTBc) familiarizing themselves with the work plan and the size of the loads being transportedd) all answers are correct3. The terms of maintenance inspections of technical devices
a) are included in the operation instructions of the device
b) are determined by the device conservatorc) are specified in the protocol by the inspector conducting the examinationd) all answers are correct4. Technical supervision is called
a) specific actions defined by law aimed at ensuring the safe operation of technical devices and devices for recovering fuel vapor, as well as actions aimed at ensuring public safety in these areas
b) institutions controlling the technical condition of devicesc) The Office of Technical Supervisiond) UDT, WDT, TDT5. Technical supervision over technical devices is performed by
a) The Office of Technical Supervision and specialized technical supervision units
b) The Office of Technical Supervision and organizations authorized by UDTc) The Office of Technical Supervision and foreign technical supervision unitsd) all answers are correct6. Changing the technical parameters or changing the construction of a technical device is treated as
a) modernization of the technical device
b) repair of the technical devicec) removal of defects and other irregularities of the technical deviced) creation of a new device7. The agreed repair or modernization of technical devices may be performed by
a) the repairer or modernizer who has the authorization issued by the relevant technical supervision authority
b) the operator of the technical device with appropriate experience in repairs or modernizationc) the conservator with appropriate experience in repairs or modernizationd) a competent operator to a small extent8. The Act on technical supervision specifies the following forms of technical supervision
a) total, partial, limited
b) full, limited, simplified
c) full, cyclical, sporadicd) UDT, WDT, TDT9. The decision allowing the operation of a technical device is issued by
a) the conservator after performing an inspection with a positive resultb) the relevant technical supervision authority or the operator of the technical device authorized by the relevant technical supervision authorityc) the relevant technical supervision authority or the public administration authority authorized by the relevant technical supervision authority
d) the relevant technical supervision authority
10. The operator of the technical device may undertake work when
a) the device has a valid decision allowing its operation if required by the relevant regulationsb) has a qualification certificate of the appropriate categoryc) the device has a current positive result of the maintenance inspection
d) all of the above conditions must be met simultaneously
11. The operator of the technical device can take up work when
a) the device has a current entry in the maintenance log confirming the device's efficiencyb) has completed the appropriate position trainingc) the device has a valid decision allowing for operation
d) all of the above conditions must be met simultaneously
12. In the event of non-compliance with the technical supervision regulations by the operator
a) receives a written warningb) receives post-inspection recommendations
c) is subject to a fine or restriction of freedom
d) answers a and b are correct13. In the event of a threat to human life or health, as well as property and the environment, the inspector
a) issues a decision to suspend the operation of the technical device
b) issues a penalty ticketc) formally instructs the operatord) all answers are correct14. In the case of dangerous damage to the technical device or an accident, the operator
a) immediately notifies UDT of the incident
b) informs the device manufacturer of the causes of the incidentc) immediately repairs the device and returns it to further operationd) reports the device for repair15. The qualification certificate for operation can be revoked by
a) the relevant technical supervision authority
b) the operator of the technical devicec) the health and safety inspectord) the National Labor Inspectorate16. Technical devices not subject to technical supervision are
a) cranes with a lifting capacity of up to 3.2 tb) hoists and winches as well as overhead cranesc) lift trucks and mobile platforms
d) transport slings
17. Technical devices subject to technical supervision are
a) cabin and chair liftsb) storage systems and devices for people with disabilitiesc) freight lifts and ship lifts
d) all answers are correct
18. A dangerous malfunction of a technical device is
a) any defect of the technical deviceb) an unforeseen malfunction, as a result of which the device is suitable for partial operationc) an unforeseen malfunction, as a result of which it is suitable for operation only at reduced parameters
d) an unforeseen malfunction, as a result of which the device is not suitable for operation or its further operation poses a threat
19. An accident is
a) a sudden event that caused bodily injury or death
b) a sudden event that caused a work interruptionc) a sudden event that results in the exclusion of the technical device from operationd) any defect of the technical device caused by a random cause20. Lifting and transporting people by a technical device intended solely for the transport of loads requires
a) agreement with the relevant technical supervision authority
b) agreement with the supervisorc) agreement with the occupational health and safety serviced) is possible with special caution and under the supervision of an inspector21. The responsibility for ensuring proper service and maintenance of the technical device lies with
a) the operator of the technical device
b) the relevant technical supervision authorityc) the National Labor Inspectorated) the UDT inspector22. The required maintenance inspections mandated by law are performed by
a) a person holding a qualification certificate for maintenanceb) an employee of the authorized service of the device manufacturer (provided they have qualification certificates for maintenance)c) in-house maintenance services
d) answers a and b are correct
23. The maintenance log of the technical device is kept by
a) the UDT inspector in the device's audit bookb) the authorized operatorc) a designated employee of the operator
d) the maintainer of the technical device
24. Acceptance tests are conducted for technical devices
a) within the timeframes consistent with the provisions of the regulation on technical supervision conditions
b) before issuing the first decision allowing for operation
c) after the repair of the technical deviced) after each change of the operator25. Periodic tests are conducted for technical devices under supervision
a) limited
b) full
c) simplifiedd) all answers are correct26. The absence of the conservator during the examination of the technical device requires at least.
a) prior agreement of this fact with the authority of the relevant technical supervision unit
b) submission of a written justification for the absence of the conservatorc) submission of a medical certificate confirming the conservator's inability to workd) all answers are correct27. A candidate for operating the technical device must
a) be at least 18 years old
b) have at least vocational educationc) have at least 1 year of work experienced) all answers are correct28. The operator of the technical device is obliged to stop work when
a) his physical and mental condition on the day of work is inappropriateb) he finds that further operation of the device poses a threatc) the device is malfunctioning
d) all answers are correct
29. The terms of maintenance inspections of the device may be specified
a) in the operation manual of the deviceb) in the act on technical supervisionc) in the regulation specifying the technical conditions of technical supervision
d) answers a and c are correct
30. The terms of periodic and ad-hoc inspections of the UTB are specified
a) in the act on technical supervision
b) in the regulation specifying the technical conditions of technical supervision
c) in the design documentation of the deviced) in the maintenance log31. The operator of the technical device is obliged to
a) follow the operating instructions regarding the operation of the device
b) follow the operating instructions regarding the maintenance of the devicec) perform repairs of the deviced) all answers are correct32. The technical device can be operated based on
a) the current sticker from the relevant technical supervision authority indicating the date of the next inspectionb) the current entry of the device's conservator in the maintenance log
c) a valid decision allowing operation issued by the relevant technical supervision authority
d) a positive protocol from the periodic or acceptance inspection33. After performing activities on the technical device, the inspector prepares
a) operating instructions for the device
b) decisions and a protocol of the performed activities
c) CE declarations of conformityd) all answers are correct34. The repair and modernization of the technical device is performed by
a) the operator within the scope of their skillsb) the conservator
c) an authorized establishment
d) the operator35. The person directly responsible for the safe operation of the technical device is
a) the operator of the device
b) the manufacturer of the devicec) the workplace health and safety inspectord) the UDT inspector36. Information regarding the rules for the safe operation of the technical device is included in
a) the operating manual of the device
b) the technical supervision actc) the maintenance logd) the protocol from the inspection conducted by the UDT inspector37. As part of the activities before starting work, the operator
a) checks the technical condition of the device through inspectionb) performs static and dynamic testsc) performs operational tests of the device
d) answers a and c are correct
38. Qualification certificates for operating technical devices subject to technical supervision are issued by
a) the training company after a positive result of the verification examb) the health and safety inspector based on the certificate of course completionc) the employer based on the passed exam
d) the relevant technical supervision authority
39. Overloading the UTB during operation
a) is prohibited
b) is permissiblec) is permissible but only up to 125% of the rated loadd) is permissible but only up to 110% of the rated load40. Ad-hoc operational tests are performed, among others,
a) after each fault removal by the maintenance technician
b) after replacing the load cables
c) once a yeard) after an accident on the device41. The duties of the operator are specified in
a) the operation manual of the technical device
b) the maintenance logc) the technical supervision actd) all answers are correct42. Periodic inspections of the technical device are carried out by
a) a conservator with the appropriate qualification certificate
b) an inspector of the relevant technical supervision authority
c) a manufacturer service employeed) the operator43. The unit of technical supervision is
a) The Office of Technical Supervisionb) Military Technical Supervisionc) Transport Technical Supervision
d) all answers are correct
44. Qualification certificates authorizing the operation of technical devices are valid in
a) the Republic of Poland
b) the European Unionc) have no specified area of validityd) Schengen zone countries45. The obligation to use personal protective equipment by operators of technical devices arises from
a) the manufacturer's operation manualb) health and safety regulationsc) internal company regulations
d) all answers are correct
46. According to the regulation of the Council of Ministers regarding the types of technical devices subject to technical supervision, the following are subject to technical supervision
a) lifts, cranes, hoists, winches and hoistsb) powered lift trucks with mechanical lifting drive, mobile platformsc) cableway lifts, chairlifts and gondolas
d) all answers are correct
47. The operating instructions may not contain
a) information about the dates and scope of maintenance inspections of technical devicesb) basic parameters and purpose of technical devices
c) dates of technical examinations carried out by the inspection unit
d) information on how to operate the device48. The revision book of the device must contain
a) a collection of protocols from examinations carried out by the inspection unit
b) a document in which maintenance inspections are recordedc) the content of current legal actsd) a list of authorized operators49. The decision issued by UDT
a) is not subject to appealb) can be changed by the PIP inspector
c) is subject to the possibility of appeal by the operator
d) each answer is incorrect50. A person who can take the qualification verification exam is one who
a) has submitted an application for qualification verificationb) is over 18 years oldc) has no health contraindications to operate technical devices
d) all answers are correct
51. After the technical inspection with a positive result, the UDT inspector
a) extends the validity of the operator's qualification certificateb) marks the device with a sticker that is a permit for the use of the devicec) informs the user in writing in the maintenance log that he agrees to the operation of the device
d) prepares a protocol of the performed activities and issues an administrative decision allowing for operation
52. Qualification certificates
a) are valid indefinitelyb) are time-limited with a validity period dependent on the number of points obtained in the exam
c) are time-limited with a validity period in accordance with the provisions of the regulation on the procedure for checking qualifications
d) are valid for a period of 15 years53. Making modifications to a technical device without agreement with the competent technical supervision authority
a) is subject to a fine or restriction of freedom
b) is subject to a penalty ticketc) is not subject to a penaltyd) all answers are incorrect54. Who allows the operation of a technical device without a valid decision permitting operation
a) is subject to a fine or restriction of freedom
b) is not subject to a penalty if no accident occursc) is subject only to a fined) is subject to imprisonment55. The operation manual is
a) a collection of information necessary for the safe operation of the device provided by the manufacturer
b) a collection of recommendations issued by the Office of Technical Supervisionc) an instruction that must be created by the device userd) all answers are correct56. Qualification certificates for operation are not required
a) if the machine is operated by its owner
b) if all mechanisms of the machine have manual drive
c) if the machine is used for private, non-profit purposesd) from persons over 60 years of age57. A person holding qualification certificates can operate
a) only the devices listed in the scope of the authorization
b) all devices subject to technical supervisionc) other devices subject to technical supervision with the employer's consentd) all UTB with a load capacity of up to 3.2 t58. The obligation of the operator of a technical device is
a) to refuse to operate the device if the decision allowing the operation of this device has expiredb) to always comply with the supervisor's orders regarding the operation of the devicec) to follow the provisions contained in the operating instructions
d) answers a and c are correct
59. Qualification certificates for operating technical devices are
a) valid in the European Union
b) valid with an identity document
c) indefinited) all answers are correct60. An operator who witnesses an accident is obliged to
a) provide assistance to the victim(s) of the accidentb) secure the scene of the incidentc) notify the supervisor
d) all answers are correct
61. The operator is not allowed to
a) lift loads whose weight he cannot determine
b) check the technical condition of the technical devicec) comply with the provisions contained in the operating instructionsd) perform external inspections of the device62. Forms of technical supervision are
a) full supervision, simplified supervision, limited supervision
b) acceptance testing, periodic testing, and ad-hoc testingc) UDT, TDT, WDTd) all answers are correct63. Lifting people with devices that have been designed and manufactured solely for lifting loads
a) is permissible, after ensuring an appropriate level of safetyb) is prohibited
c) is permissible, after agreeing with the relevant technical supervision authority on the detailed operating conditions
d) is permissible once on a written order from a superior64. Lifting loads using two or more UTB
a) is permissible, provided that the operator develops detailed operating conditions describing organizational and technical activities that minimize risk
b) is always permissible if the load weight does not exceed the sum of the lifting capacities of the devices usedc) is permissible if the load weight does not exceed half the lifting capacity of each of the devices usedd) is never permissible65. Being under a load being lifted is
a) always prohibited
b) allowed for persons controlling the bottom of the load;c) allowed if the safety factor of the slings is not less than 5d) allowed if the safety factor of the slings is not less than 766. Lifting loads over people is
a) allowed provided that written permission is obtained from the person in charge of the transportb) allowed, after ensuring safety factors for slings and gripping devices greater than 10c) allowed provided that people are notified and equipped with personal protective equipment
d) all answers are incorrect
67. Qualification certificates for operating technical devices subject to technical supervision are issued by
a) the owner of the device
b) UDT, TDT, WDT
c) PIPd) all answers are incorrect68. The examination board informs the interested person about the exam result
a) within 7 days after the exam in written form
b) directly after the exam
c) within 14 days after the exam in electronic formd) by registered mail or email after 30 working days from the exam date69. The maintenance log should be kept
a) only in paper form
b) in electronic or paper form
c) only in electronic formd) by the operator70. The workplace instruction
a) is always provided along with the operating instructions by the device manufacturerb) constitutes an unwritten collection of customs adopted in the workplace
c) is issued by the employer and contains detailed guidelines regarding health and safety at the workplace
d) does not apply to operators of mobile devices71. After the expiration date of the qualification certificate for operating the technical device, the operator
a) can operate the technical device as long as they continue working for the same employerb) can operate the technical device as long as they submit an application for the issuance of another certificate
c) can operate the technical device only after obtaining a new qualification certificate
d) submits an application for an extension of the validity period of the qualification certificate72. The extension of the validity of the qualification certificate occurs
a) upon a written request from the operator
b) automatically after the expiration date of the certificatec) upon a written notification from the employer of the operatord) after a prior telephone notification73. The lifting capacity of the technical device is a parameter of the device directly related to
a) the maximum height of the lifted loadb) the maximum volume of the lifted load
c) the maximum mass of the lifted load
d) the product of the mass and volume of the lifted load74. The net mass of 1000 l of water is
a) 800 kgb) 900 kg
c) 1000 kg
d) 1100 kg75. The mass of a load consisting of 40 packages of 25 kg each is
a) 800 kg
b) 1000 kg
c) 1100 kgd) 900 kg76. The mass of 60 cartons weighing 20 kg each is
a) 800 kgb) 1000 kgc) 1100 kg
d) 1200 kg
77. The mass of the lifted load can be determined based on
a) the collective tag on the transported loadb) by calculating considering the specific weight and volumec) transport and warehouse documentation
d) all answers are correct
78. Information regarding the lifting capacity of the device may be included
a) in the operating manualb) on the nameplatec) on the technical device
d) all answers are correct
79. The correct designation of the lifting unit is
a) kg
b) Pac) mthd) mm80. In the control panel of the construction freight-passenger lift, there should be:
a) call buttons for the stopb) call and dispatch buttons
c) dispatch buttons for stops and "ALARM" and "STOP" buttons
d) all of the above answers are correct81. During normal operation, riding on the roof of a construction hoist for goods and passengers:
a) is allowed because the hoist is equipped with railings to prevent falling outb) is allowed but one must not lean beyond the outline of the roof
c) is not allowed
d) is allowed but only in case there is no space in the cabin82. The nameplate of the hoist should contain:
a) information about the location of the first aid kit
b) year of production, name of the manufacturer, lifting capacity, serial number
c) registration number of the Technical Supervision Officed) a list of standards and regulations applied in the production of the technical device83. Working with a construction hoist that is not anchored to the building structure:
a) is prohibited
b) is always allowed provided that special caution is exercisedc) is allowed if such a configuration is provided in the assembly instructionsd) is allowed only up to a lifting height of 3.5 m84. A properly functioning gripping device should activate:
a) after exceeding the speed by a value specified by the manufacturer in the operating instructions of the device
b) after exceeding the lifting capacity by a value specified by the manufacturer in the operating instructions of the devicec) after traveling below the lower stop by a distance specified by the manufacturer in the operating instructions of the deviced) after stopping at the destination stop85. The main switch should:
a) be labeled in the control cabinet "MAIN SWITCH"b) have the ability to be secured against unauthorized activationc) not disconnect the circuits allowing control of the hoist from the cabin
d) answers a and b are correct
86. A properly functioning gripping device, after its activation, will hold the cabin loaded with a load corresponding to the rated lifting capacity for:
a) an indefinite time
b) at least 1 hourc) at least 3 hoursd) at least 10 minutes87. Bumpers in a construction hoist:
a) keep the platform at the level of the stop during loading or unloadingb) keep the platform at the level of the extreme stop during loading
c) limit the movement of the platform beyond the extreme stops
d) protect the hoist structure from the effects of collisions with other machines88. Landing gates:
a) should be installed at all levels that provide access to the construction hoist platform
b) should be installed only at the most frequently serviced levels that provide access to the construction hoist platformc) are not required if only construction workers have access to the hoistd) are not required if only authorized personnel have access to its operation89. A properly functioning brake of a construction hoist:
a) will hold the cabin with a load during loadingb) will stop the cabin with a load going downc) will not allow exceeding the rated speed of the hoist
d) answers a and b are correct
90. Is a lightning protection system required for a construction hoist operating in an open space?
a) no, if the hoist's power supply is protected by a residual current device with a tripping current of 30mA
b) yes
c) no, if the metal elements are protected by a non-conductive coatingd) no, if the hoist's power supply is protected by an overload current device91. What is a cross lock in a control panel?
a) this lock prevents the simultaneous activation of opposing directions of the mechanism's movement
b) it is another name for a key switchc) a lock that prevents controlling the lift from two places at the same timed) answers a and b are correct92. Information about the possibility of transporting people with a construction lift can be found in:
a) the technical supervision actb) the daily service logc) the maintenance log
d) the operating instructions and on the plate placed on the technical device
93. During the loading of a construction freight lift:
a) entering the lift platform is always possibleb) entering the platform is possible as long as it has the proper safety measures
c) entering the lift platform is always prohibited
d) entering the lift platform is only possible when the cabin is equipped with grabs94. If there is a power failure while driving a construction freight-passenger lift:
a) the operator should immediately contact the maintenance technician by phone
b) the operator should try to emergency lower the lift to the nearest stop according to the procedure described in the operating instructions
c) the operator may leave the cabin and exceptionally descend the lift mastd) all of the above answers are correct95. During the operation of a construction lift, the operator should:
a) pay attention to the anchoring to ensure that all fastening screws and braces have not been damaged during operationb) periodically tighten the anchoring screws according to the manufacturer's instructionsc) not pay attention to the anchoring, as it is checked by the maintenance technician
d) answers a and b are correct
96. Upon noticing a dangerous damage to the crane by the operator:
a) the device must be immediately stopped, secured against unauthorized use, and the supervisor and other operators must be notified
b) the crane can be used until the end of the shift and then the supervisor should be informed about the device's damagec) no action should be taken, as the crane has a valid decision allowing its operationd) the device should be stopped and repaired independently97. When operating a construction crane with an incomplete cabin enclosure:
a) safety harnesses must always be used
b) personal protective equipment specified in the crane's operating instructions and required by the health and safety regulations of the facility where the device is installed must be used
c) it is not necessary to use any personal protective equipmentd) protective measures that are currently available on site should be used98. Is it allowed to transport oversized goods?
a) no, under no circumstances
b) yes, if we receive permission from the conservatorc) yes, if they do not exceed the rated load together with the operatord) yes, if they are additionally secured to the load base99. If the operating instructions do not state otherwise, the damage to the rack gear qualifying it for immediate replacement is:
a) one tooth brokenb) two adjacent teeth brokenc) any three teeth broken
d) all of the above answers are correct
100. Does the operator have an obligation to inspect the technical condition of the device before starting work?
a) yes
b) no, only checks the records in the maintenance logc) yes, but only at the request of the construction managerd) no, if the device is still under the manufacturer's warranty101. If the daily inspection of the technical condition of the lift performed by the operator ended negatively, then:
a) work can only be done under the supervision of the conservatorb) work can only be done under the supervision of the OHS inspectorc) work can be done at the explicit request of the supervisor
d) all answers are incorrect
102. The decision allowing the operation of a construction goods lift is issued for a period of:
a) 1 year
b) 2 years
c) 3 yearsd) 5 years103. The decision allowing the operation of a construction goods and passenger lift is issued for a period of:
a) 1 year
b) 2 yearsc) 3 yearsd) 5 years104. The number of people that can be transported along with the operator in the cabin of a construction goods and passenger lift is:
a) not specified
b) specified by the manufacturer on the nameplate and results from the rated load of the technical device
c) always greater than 5d) arbitrary, depending on how many fit in the lift cabin105. The operator of the goods and passenger lift should be located:
a) in any place in the cabinb) by the cabin doors
c) by the control panel in the cabin
d) always in the center of the cabin106. In the case where the total mass of people and goods in the cabin exceeds the rated load, the operation of the machine by the operator is allowed:
a) in normal operation up to 110% of the rated loadb) in normal operation up to 125% of the rated loadc) at the request of the UDT inspector during the lift inspection
d) all of the above answers are incorrect
107. In the case of overload signaling of the technical device, the operator should:
a) continue working if possible
b) immediately reduce the load to the value at which the overload signaling disappears
c) turn off or bridge the overload sensor to prevent such a situation from recurringd) order a ride to the lowest stop to relieve the excessive load108. Operating a construction lift during a storm:
a) is allowed because the lift is equipped with lightning protectionb) is allowed at the request of the construction managerc) may be performed if required by the construction schedule
d) is prohibited
109. The brake test is performed:
a) before starting work with the lift
b) only during inspections conducted by UDTc) only after replacing load-bearing elementsd) only in the presence of a conservator110. Unless the instruction states otherwise, the test of the limit switch of the lifting mechanism in the upward direction is performed:
a) without a load
b) with a load equal to 50% of the rated loadc) with a load equal to 100% of the rated loadd) with a load equal to 200% of the rated load111. The safety switch "STOP" is used for:
a) securing the lift against unauthorized use after work is completed
b) immediate stopping of the machine in emergency situations
c) activating the emergency brake in case of a main brake failured) all of the above answers are correct112. Upon obtaining a positive result in this exam, you will have a qualification certificate for operating:
a) construction hoists for goodsb) construction hoists for goods and passengersc) goods lifts
d) all answers are correct
113. The maximum wind speed at which it is possible to operate a lift is:
a) determined by the site manager
b) specified in the operating instructions
c) determined by the lift operatord) determined by the owner of the technical device114. The person responsible for the safe placement of the load during the transport by construction lift is:
a) the operator with appropriate qualifications
b) the employee responsible for compliance with health and safety regulations on the premisesc) the site managerd) the construction worker acting as a signalman115. The task of the safety lock on the lift cabin doors is to prevent:
a) opening the landing doors when the cabin is outside the unlocking zoneb) movement of the cabin if at least one landing door is not lockedc) movement of an overloaded cabin
d) answers a and b are correct
116. Interrupting any safety switch should cause the disconnection of the drive motor with simultaneous activation of the brake:
a) after 1 minute
b) immediately
c) after stopping at the destination stopd) after the nearest change of direction117. Mechanical safeguards that may be present in the cabin of the lift:
a) emergency STOP switch, barriers and roof, safety locks, doors, brakeb) direction switch, control cover, doors and barriers, sound signal
c) barriers and roof, safety locks, doors, control cover
d) safety locks, control cover, limit switch118. Exceeding the permissible load of the technical device during normal operation:
a) is permissible if the operator is not transporting passengers
b) is not permissible
c) is permissible up to 110% of the nominal loadd) is permissible if the lift has a load limiter119. Limit switches of the lift are used for:
a) disconnecting control in case the load base moves outside the normal working zones
b) disconnecting control in case of exceeding the loadc) detecting and signaling overloadd) mechanically blocking the load base in extreme position120. The speed limiter in a construction freight-passenger lift is:
a) a device used to activate the cabin grabbers in case of exceeding the established permissible speed
b) a device that signals to the operator exceeding the permissible speedc) a device that limits the frequency of the supply currentd) a device that reduces the speed of the load base when approaching the stop121. When finishing work with a freight construction crane, one should:
a) leave the transport platform at the parking stop (usually the lower one)b) unload the cranec) secure the crane against use by unauthorized persons