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一回路 primary circuit
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考题
Sequential circuit is a common logic device whose output values, at a given instant, depend upon its input values and the internal state at that instant, and whose internal state depends upon the(66)preceding input values and the preceding internal state. A sequential circuit can assume a finite number of internal states and may therefore be regarded, from an abstract(67), as a finite(68).Combinational circuit is another logic device whose output values, at any given instant, depend upon the input values at that instant. A combinational circuit is a(69)of a sequential circuit whose internal state is not taken(70).A．directlyB．immediatelyC．instantlyD．snapshot
考题
Click the Exhibit button. Within an ONS 15454, you are provisioning a circuit on an unprotected UPSR ring. In the exhibit, which two must you configure?() (Choose two.)
A. revertiveB. circuit typeC. circuit sizeD. bidirectionalE. protected dropsF. switch on PDI-P
考题
A circuit breaker and a fuse have a basic similarity(类似) in that they both ______.A.can be reset to energize the circuitB.should open the circuit when overloadedC.will burn out when an over current flow developsD.should short the circuit when overloaded
考题
A circuit breaker and a fuse have a basic similarity in that they both______.A.can be reset to energize the circuitB.should open the circuit when overloadedC.will burn out when an over current flow developsD.should short the circuit when overloaded
考题
A circuit breaker differs from a fuse in that a circuit breaker ______.A.melts and must be replacedB.is enclosed in a tube of insulating material with metal ferrules(环) at each endC.gives no visual indication of having opened the circuitD.trips to break the circuit and may be reset
考题
Which three are optional extensions of the Frame Relay Local Management Interface specification？（）A、switched virtual circuitB、virtual circuit statusC、simple flow controlD、multicastingE、permanent virtual circuit
考题
On an ONS 15454 node you can tunnel a（n） （）.A、 SDH circuit over a SONET network delivering it as an SDH signalB、 SDH circuit over a SONET network delivering it as a SONET signalC、 SONET circuit over an SDH network delivering it as an SDH signalD、 SONET circuit over an SDH network delivering it as a SONET signal
考题
帧中继中，虚电路VC（VirtualCircuit）是建立在两台网络设备之间的逻辑电路。根据建立方式，可以将虚电路分为（）.A、静态虚电路SVC（Static Virtual Circuit）B、临时虚电路TVC（Temporary Virtual Circuit）C、永久虚电路PVC（Permanent Virtual Circuit）D、交换虚电路SVC（Switching Virtual Circuit）
考题
Which two of these are characteristics of Metro Ethernet? （）A、class of serviceB、bandwidth profilesC、user-network interfaceD、Ethernet LAN circuit attributesE、Ethernet virtual circuit attributes
考题
On an ONS 15454 node you can tunnel an （）.A、SDH circuit over a SONET network delivering it as an SDH signalB、SDH circuit over a SONET network delivering it as a SONET signalC、SONET circuit over an SDH network delivering it as an SDH signalD、SONET circuit over an SDH network delivering it as a SONET signal
考题
单选题In a series circuit, which value will remain unchanged at all places in the circuit?（）A
VoltageB
CurrentC
ResistanceD
Inductance
考题
单选题On an ONS 15454 node you can tunnel a（n） （）.A
SDH circuit over a SONET network delivering it as an SDH signalB
SDH circuit over a SONET network delivering it as a SONET signalC
SONET circuit over an SDH network delivering it as an SDH signalD
SONET circuit over an SDH network delivering it as a SONET signal
考题
单选题Capacitance is the property of an electric circuit opposing a change in the （）A
current in the circuitB
voltage in the circuitC
inductance in the circuitD
resistance in the circuit
考题
单选题A circuit that has one wire in contact with the hull of the ship is a（）A
series circuitB
grounded circuitC
short circuitD
closed circuit
考题
多选题帧中继中，虚电路VC（VirtualCircuit）是建立在两台网络设备之间的逻辑电路。根据建立方式，可以将虚电路分为（）.A静态虚电路SVC（Static Virtual Circuit）B临时虚电路TVC（Temporary Virtual Circuit）C永久虚电路PVC（Permanent Virtual Circuit）D交换虚电路SVC（Switching Virtual Circuit）
考题
单选题The purpose of a main switchboard circuit breakers reverse-power trip is to （）.A
prevent main circuit overloadB
protect the circuit breaker blowout coilC
prevent alternator motorizationD
prevent low voltage tripout
考题
单选题Fuses placed in series with a thermal trip-type circuit breaker are used for （）.A
time-delay protectionB
short-circuit protectionC
short duration surge protectionD
sustained overload protection
考题
单选题A circuit breaker differs from a fuse in that a circuit breaker （）.A
melts and must be replacedB
is enclosed in a tube of insulating material with metal ferrules at each endC
gives no visual indication of having opened the circuitD
trips to break the circuit and may be reset
考题
多选题Which two of these are characteristics of Metro Ethernet? （）Aclass of serviceBbandwidth profilesCuser-network interfaceDEthernet LAN circuit attributesEEthernet virtual circuit attributes
考题
单选题DC generators are classified according to the manner in which（）A
they are usedB
the field windings are connected to the loadC
the armature circuit is connected to the loadD
the field windings are connected to the armature circuit
考题
单选题When working on a high voltage circuit, you should always have another person present with you.This person should have a good working knowledge of （）A
the circuit being worked on and the location of all switches and circuit breakers controlling itB
first-aid techniques for treating electrical shockC
cardiopulmonary resuscitation (CPR)D
All of the above
考题
多选题Which three are optional extensions of the Frame Relay Local Management Interface specification？（）Aswitched virtual circuitBvirtual circuit statusCsimple flow controlDmulticastingEpermanent virtual circuit
考题
问答题GIS就地控制屏上发“跳闸回路A/B闭锁（TRIP CIRCUIT A/B BLOCKED）”报警的原因有哪些？
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