单选题Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out （）ADe-energize the applicable switchboard busBBypass the interlocksCSecure and tag the supply circuit breaker in the open positionDStation a man at the circuit supply switch
单选题
Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out （）
A
De-energize the applicable switchboard bus
B
Bypass the interlocks
C
Secure and tag the supply circuit breaker in the open position
D
Station a man at the circuit supply switch
参考解析
解析：
暂无解析
相关考题：
Before sending your resume to prospective employersor scheduling any interviews , you need to analyze the job market. Analyzing the job market involves determining actual jobopenings and gathering information about organizations for which you want to work.
Software refers to(70). The most important software on any computer is(71).A．inputB．programsC．outputD．electronic
Before doing any work on a hydraulic system equipped with accumulators, you shouldA.drain the accumulators and purge with oxygenB.bleed off all stored energy from the accumulators completelyC.charge the accumulators to prevent system energy lossD.pump the hydraulic fluid into the accumulators to prevent fluid loss
Which system should be supplied to obtain the best efficiency and lowest emissions?A.Lean combustion principleB.Fuel oil systemC.Electrical control systemD.Electronic control system
Which statement concerning reserve sources of energy for GMDSS is FALSE ________．A.While the ship is at sea，there must be available at all times a supply of electrical energy sufficient to operate the radio installations and to charge any batteries used as part of a reserve source of energyB.Both the VHF and MF/HF installations must be simultaneously suppliedC.A means of ensuring a continuous supply of electrical power must be provided to all GMDSS equipment that could be affected by an interruption in powerD.If a UPS or equivalent is used to supply power to the ship's GPS receiver or other source of positional information，a means must be provided to ensure the continuous supply of the information in the event of a failure to the ship's main or emergency source of power
OEE英文全称是什么？（）A、Overall Equipment Efficiency全局设备效率B、Opto-Electronic Element光电元器件C、Overall Equipment Environment全局设备环境D、Operating Equipment Effectivity设备可操作性
You work as the enterprise exchange administrator at Xxx .Xxx is using Microsoft Exchange Server 2010 as their messaging solution.Xxx has a Research department.Xxx currently only has one electronic microscope that the staff must share.You receive instruction from Xxx to implement a solution so that all the employees are able to automatically calendar the use of an electronic microscope. How can you achieve the goal？（）A、You must use an equipment mailbox.B、You must use a local use request.C、You must use a managed folder mailbox policy.D、You must use Personal Archives.
单选题When electrical equipment is involved in a fire，the stream of dry chemicals should be（）.Aaimed at the source of the flamesBfogged above the equipmentCshot off a flat surface onto the flamesDused to shield against electrical shock
单选题When a rescuer finds an electrical burn victim in the vicinity of live electrical equipment or wiring，his first step is to（）.Aflush water over any burned area of the patientBapply ointment to the burned areas on the patientCget assistance to shut down electrical power in the areaDremove the patient from the vicinity of the live electrical equipment or wiring
单选题Which statement concerning reserve sources of energy for GMDSS is FALSE（）.AWhile the ship is at sea，there must be available at all times a supply of electrical energy sufficient to operate the radio installations and to charge any batteries used as part of a reserve source of energyBBoth the VHF and MF/HF installations must be simultaneously suppliedCA means of ensuring a continuous supply of electrical power must be provided to all GMDSS equipment that could be affected by an interruption in powerDIf a UPS or equivalent is used to supply power to the ship's GPS receiver or other source of positional information，a means must be provided to ensure the continuous supply of the information in the event of a failure to the ship's main or emergency source of power
单选题Before doing any work on a hydraulic system equipped with accumulators, you should（）Adrain the accumulators and purge with oxygenBbleed off all stored energy from the accumulators completelyCcharge the accumulators to prevent system energy lossDpump the hydraulic fluid into the accumulators to prevent fluid loss
单选题Before doing maintenance on electrical equipment, you should （）.Aturn off power firstBturn on power firstCwith a test pen in handDtell C/E
单选题Which of the listed classes of fire is considered as one involving electrical equipment?（）AClass ABClass BCClass CDClass D
单选题Which of the following statements represents the FIRST precaution to be taken prior to working on any installed electrical component （）AWear rubber gloves and bootsBUse only approved non-conducting toolsCGround the case of the machine before beginning any repairsDOpen the supply circuits and tag the switches
单选题Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out （）ADe-energize the applicable switchboard busBBypass the interlocksCSecure and tag the supply circuit breaker in the open positionDStation a man at the circuit supply switch
单选题Steering gears can be arranged with hydraulic control equipment known as a （）, or with electrical control equipment.AtelemeterBtelemanometerCtelemotorDtelemometer
单选题Before using or operating any equipment, you should first （） its manual thoroughly and understand its contents（）.Aread/sufficientBconsult/sufficientlyCread/sufficientlyDconsult/sufficient
单选题The greatest detrimental effect on idle electrical equipment, such as cargo pump motors, is the（）.Aloss of residual magnetismBabsorption of moisture in the insulationCinsulation varnish flakingDdirt collecting on the windings
单选题Prior to any overhaul work on electric equipment, it is important to ensure the circuits are （）.AliveBdeadCexcitedDon line
单选题What is NOT a characteristic of carbon dioxide fire-extinguishing agents?（）AEffective even if ventilation is not shut downBWill not deteriorate in storageCNon-corrosiveDEffective on electrical equipment
单选题A fire in electrical equipment should be extinguished by using（）.Asalt waterBfoamClow-velocity fogDCO2
多选题Based on which two conditions can master Preventive Maintenance （PM） schedules be created？（）Aelapsed time since the target start date or completion date of previous work generated by PMBdifference between completion date of previous work and system date is equal to Lead TimeCelapsed time since the target start date or completion date of the latest work orders for the assetDmetered equipment usage since the target start date or completion date of previous work generated by PMEmetered equipment usage since the target start date or completion date of the latest work order for the asset
单选题No outlet on a fire hydrant may point above the horizontal in order to（）.Aavoid kinking the hoseBavoid personal injury during connectionCmake connecting easierDprevent spray on electrical equipment