Electrical circuits are protected against overheating by means of a/an _______.A.circuit breakerB.amplifierC.diode （二极管）D.capacitor

题目

Electrical circuits are protected against overheating by means of a/an _______.

A.circuit breaker

B.amplifier

C.diode （二极管）

D.capacitor

相似考题

1.●Frame. Relay is simplified form. of (71) ，similar in principle to (72) ，in which synchronous，frames of data are routed to different destinations depending on header information．Packets are routed throught one or more Virtual Circuits known as (73) .Most Virtual Circuits are (74) ，which means that the network provider sets up all DLCI connections at subscription time． (75) are also part of the Frame. Relay specification．They privide a link that only lasts only as long as the session．(71) A．Datagram SwitchingB．Datagram RoutingC．Packet SwitchingD．packet Routing(72) A．X．21B．X．25C．X．28D．X．29(73) A．DLCIsB．HDLCsC．SDLCsD．DLs(74) A．Permanent CircuitsB．Permanent Virtual CircuitsC．Switched Virtual CircuitsD．Switching Circuits(75) A．Permanent CircuitsB．Permanent Virtual CircuitsC．Switched Virtual CircuitsD．Switched Circuits

2.Fusible plugs are installed in fire-tube boilers to _____.A.provide a means of draining the boilerB.warn the engineer of low water levelC.cool the crown sheet at high firing ratesD.open the burners electrical firing circuits

3.Frame. Relay is simplified form. of(71), similar in principle to(72), in which synchronous, frames of data are routed to different destinations depending on header information.Packets are routed throught one or more Virtual Circuits known as(73)Most Virtual Circuits are(74), which means that the network provider sets up all DLCI connections at subscription time.(75)are also part of the Frame. Relay specification. They privide a link that only lasts only as long as the session.A．Datagram SwitchingB．Datagram RoutingC．Packet SwitchigD．packet Routing

4.As it is used in paragraph 4 of the passage, the word "porous" means______.A．having or full of holesB．lacking physical strength, energy, or vigorC．easily broken or hurtD．powerful against harm.

参考答案和解析
正确答案：A
更多“Electrical circuits are protected against overheating by means of a／an _______.A.circuit b ”相关问题

  • 第1题：

    What are two benefits of the modular design of the Junos OS?()

    A. Each module uses application-specific integrated circuits (ASICs).

    B. Each module runs in its own protected memory space.

    C. Each module can be individually restarted.

    D. Each module is supported across all Junos platforms.


    参考答案：B, C

  • 第2题：

    The part of the shipboard electrical system used to control the distribution of power to the branch circuits, is the ______.

    A.bridge control panel

    B.disconnect links

    C.main switchboard

    D.governor relay box


    正确答案：C

  • 第3题：

    The item ______ is not the advantage of the hydraulic winch．

    A.less jerky starts

    B.less jerky stops

    C.overheating worries

    D.none of the overheating worries


    正确答案：C

  • 第4题：

    An ABC dry chemical fire extinguisher would be LEAST effective against a fire in ______.

    A.a mattress

    B.spilled liquids such as oil or paint

    C.high voltage electrical gear

    D.a trash can


    正确答案：A
    干粉灭火机对席子着火的扑救效果最差。

  • 第5题：

    What are two benefits of the modular design of the Junos OS?（）

    • A、Each module uses application-specific integrated circuits (ASICs).
    • B、Each module runs in its own protected memory space.
    • C、Each module can be individually restarted.
    • D、Each module is supported across all Junos platforms.

    正确答案:B,C

  • 第6题：

    单选题
    When electrical equipment is involved in a fire，the stream of dry chemicals should be（）.
    A

    aimed at the source of the flames

    B

    fogged above the equipment

    C

    shot off a flat surface onto the flames

    D

    used to shield against electrical shock


    正确答案： C
    解析： 暂无解析

  • 第7题：

    单选题
    What type of protection is implemented when the DBA issues the ALTER DATABASE SET STANDBY DATABASE PROTECTED； command？（）
    A

    The standby database is protected against write operations. 

    B

    The primary database is protected against write operations. 

    C

    The primary database is protected against data loss and data divergence. 

    D

    The standby database is protected against data loss and data divergence. 


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    Electric generators can be protected against overload（）.
    A

    With switches

    B

    With a governor on the engine

    C

    With fuses or circuit breakers

    D

    By using heavy wire


    正确答案： D
    解析： 暂无解析

  • 第9题：

    单选题
    Which of the following statements represents the FIRST precaution to be taken prior to working on any installed electrical component （）
    A

    Wear rubber gloves and boots

    B

    Use only approved non-conducting tools

    C

    Ground the case of the machine before beginning any repairs

    D

    Open the supply circuits and tag the switches


    正确答案： B
    解析： 暂无解析

  • 第10题：

    单选题
    Electric circuits are protected against overloads and short circuits by means of a/an （）.
    A

    circuit breaker

    B

    amplifier

    C

    diode

    D

    capacitor


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    Electrical circuits are protected against overheating by means of a/an （）.
    A

    circuit breaker

    B

    amplifier

    C

    diode

    D

    capacitor


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    An ABC dry chemical fire extinguisher would be LEAST effective against a fire in（）.
    A

    a mattress

    B

    spilled liquids such as oil or paint

    C

    high voltage electrical gear

    D

    a trash can


    正确答案： A
    解析： 暂无解析

  • 第13题：

    Frame. Relay is simplified form. of(71), similar in principle to(72), in which synchronous, frames of data are routed to different destinations depending on header information . Packets are routed throught one or more Virtual Circuits known as(73). Most Virtual Circuits are(74),which means that the network provider sets up all DLCI connections at subscription time.(75)are also part of the Frame. Relay specification . They privide a link that only lasts only as long as the session.

    A．Datagram Switching

    B．Datagram Routing

    C．Packet Switching

    D．packet Routing


    正确答案：C

  • 第14题：

    Electrical wiring on all "T-Boats" must be ______.

    A.concealed to prevent mechanical damage

    B.concealed so the boat can be maintained more easily

    C.protected from the weather

    D.in an accessible place behind the ceiling


    正确答案：C

  • 第15题：

    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 energy

    B.Both the VHF and MF/HF installations must be simultaneously supplied

    C.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 power

    D.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


    正确答案：B

  • 第16题：

    The word“aided”in the first paragraph means________.

    A.needed
    B.helped
    C.caught
    D.protected

    答案：B
    解析：

  • 第17题：

    What type of protection is implemented when the DBA issues the ALTER DATABASE SET STANDBY DATABASE PROTECTED； command？（）

    • A、The standby database is protected against write operations. 
    • B、The primary database is protected against write operations. 
    • C、The primary database is protected against data loss and data divergence. 
    • D、The standby database is protected against data loss and data divergence. 

    正确答案:C

  • 第18题：

    单选题
    The part of the shipboard electrical system used to control the distribution of power to the branch circuits, is the （）.
    A

    bridge control panel

    B

    disconnect links

    C

    governor relay box

    D

    main switchboard


    正确答案： D
    解析： 暂无解析

  • 第19题：

    单选题
    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 energy

    B

    Both the VHF and MF/HF installations must be simultaneously supplied

    C

    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 power

    D

    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


    正确答案： D
    解析： 暂无解析

  • 第20题：

    单选题
    Fusible plugs are installed in fire-tube boilers to （）.
    A

    provide a means of draining the boiler

    B

    warn the engineer of low water level

    C

    cool the crown sheet at high firing rates

    D

    open the burners electrical firing circuits


    正确答案： C
    解析： 暂无解析

  • 第21题：

    多选题
    What are two benefits of the modular design of the Junos OS?（）
    A

    Each module uses application-specific integrated circuits (ASICs).

    B

    Each module runs in its own protected memory space.

    C

    Each module can be individually restarted.

    D

    Each module is supported across all Junos platforms.


    正确答案： B,D
    解析： 暂无解析

  • 第22题：

    单选题
    When two DC generators operate in parallel, they are protected against motorizing by（）
    A

    blow out coils

    B

    governor relay

    C

    under voltage trips

    D

    reverse current trips


    正确答案： A
    解析： 暂无解析

  • 第23题：

    单选题
    Vessel underway means that a vessel is（）.
    A

    on the way

    B

    at anchor

    C

    made fast to a terminal

    D

    moving against water


    正确答案： B
    解析： 暂无解析

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