单选题Brushless generators are designed to operate without the use of（）.AbrushesBslip ringsCcommutatorsDall of the above
单选题
Brushless generators are designed to operate without the use of（）.
A
brushes
B
slip rings
C
commutators
D
all of the above
参考解析
解析：
暂无解析
相关考题：
But the hardware is designed to use even（）power than other schemes， making it especially appropriate for such things as RFID tags， which must work for years（）any external power source.A．most B．more C．less D．otherA．with B．without C．as D．than
When the prime movers of two paralleled generators are equipped with mechanical-hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will .A.pick up more of any increase in loadB.pick up less of any increase in loadC.share an equal amount of any increase in loadD.drop an equal amount of any decrease in load
Brushless generators are designed to operate without the use of_____.A.brushesB.slip ringsC.commutatorsD.all of the above
A fixed carbon dioxide extinguishing system for a machinery space，designed WITHOUT a stop valve in the line leading to the protected space，is actuated by ______.A.one controlB.two controlsC.three controlsD.none of the above
What is TRUE of pressure/vacuum valves?A.They are designed to provide for the flow of small volumes of tank atmospheres caused by thermal variations in a cargo tankB.They should operate in advance of the pressure/vacuum breakersC.They should be kept in good working order by regular inspection and cleaningD.All of the above
Instructions on how to conduct search and rescue are given in the ______ which is primarily designed for use by merchant ship．A.MARPOLB.IRPCSC.SOLASD.MERSAR
The capacity of the segregated ballast tanks shall be ______ determined that the ship may operate safely on ballast voyages without recourse to the use of cargo tanks for water ballast except as provided otherwise．A.SuchB.AsC.SoD.Well
It is dangerous for vessels without the use of radar ______ the estuary．A.To getB.To approachC.To proceedD.To close
It is dangerous for vessels without the use of radar______the estuary(河口)．A.to getB.to approachC.to proceedD.to close
Which command （without options） would you use to display how much space is available on all mounted partitions？（）
单选题The generators on your rig have shut down，leaving you without navigation lights. Which emergency signal would you transmit over the VHF radio to alert vessels in the area of your predicament? （）AMayday，Mayday，MaydayBPan，Pan，PanCSecurity，Security，SecurityDLights out，Lights out，Lights out
单选题You are developing a Windows Communication Foundation (WCF) service that must be discoverable.You need to ensure that the ServiceHost instance supports multiple discovery versions. What should you do?（）A- Specify a unique DiscoveryVersion parameter for each endpoint constructor. - Use the same value for the Address property of each endpoint.B- Use the endpoint constructor without the DiscoveryVersion parameter. - Use a unique value for the Address property of each endpoint.C- Specify a unique DiscoveryVersion parameter for each endpoint constructor. - Use a unique value for the Address property of each endpoint.D- Use the endpoint constructor without the DiscoveryVersion parameter. - Use the same value for the Address property of each endpoint.
单选题Which is a function of the voltage regulators used with AC generators?（）ATo cut out generators when they are no longer requiredBTo cut in additional generators automatically as requiredCTo divide the KW load equally between generators operating in parallelDTo divide reactive current between generators operating in parallel
单选题It is danger for vessels without the use of（）to approach the estuary in such poor visibility.ALoran CBDirection FinderCGyro- compassDRadar
单选题What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）AWhiteBBlackCBlueDClear
单选题When the prime movers of two paralleled generators are equipped with mechanical- hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will （）.Apick up more of any increase in loadBpick up less of any increase in loadCshare an equal amount of any increase in loadDdrop an equal amount of any decrease in load
单选题Why is it desirable to operate paralleled AC generators at the same power factor?（）ACirculating currents are kept to a minimumBField excitation losses are kept to a minimumCGenerator rotors will have a lesser tendency to huntDBecause a power factor increase will decrease kilowatt output
单选题Time delayed or delayed action-type fuses are designed to （）.Aprevent grounds in branch circuitsBprevent opens in motor circuitsCpermit momentary overloads without meltingDguard lighting and electronic circuits
单选题For any piston ring to operate smoothly without scuffing ,the ring must be （）.Aof a material harder than the cylinder linerBproperly lubricatedCprevented from compressingDprevented from rotating during engine operation
单选题The VDR system is designed to operate（）once it is set up correctly.There is no user interaction.AautomaticallyBaccuratelyCpromptlyDconspicuously
单选题The pitch of a propeller is a measure of the（）.Aangle that the propeller makes with a free stream of waterBangle that the propeller makes with the surface of the waterCnumber of feet per revolution the propeller is designed to advance in still water without slipDpositive pressure resulting from the difference of the forces on both sides of the moving propeller in still water without slip
单选题Which of the following types of motors is often designed for use in correcting power factor?（）APolyphaseBWound-rotorCInductionDSynchronous
单选题A fixed carbon dioxide extinguishing system for a machinery space，designed WITHOUT a stop valve in the line leading to the protected space，is actuated by（）.Aone controlBtwo controlsCthree controlsDnone of the above
单选题Turbocharging system may be designed to operate on either the （） or the constant pressure exhaust system.ApulseBexhaustCfluctuatingDhunting
单选题When two DC generators operate in parallel, they are protected against motorizing by（）Ablow out coilsBgovernor relayCunder voltage tripsDreverse current trips
单选题Deck foam systems，designed to protect cargo areas on tankers built after January 1，1975，must have a supply of foam-producing material to operate the system at its designed rate of foam production for（）.A15 minutes without rechargingB20 minutes without rechargingC25 minutes without rechargingD30 minutes without recharging
单选题What is TRUE of pressure/vacuum valves? （）AThey are designed to provide for the flow of small volumes of tank atmospheres caused by thermal variations in a cargo tankBThey should operate in advance of the pressure/vacuum breakersCThey should be kept in good working order by regular inspection and cleaningDAll of the above