单选题Which of the following statements is true concerning all three-phase alternators?（）A Each has three separate but identical armature windings acted on by one system of rotating magnetsB Each has one armature winding acted on by three identical but separ

题目
单选题
Which of the following statements is true concerning all three-phase alternators?（）
A

Each has three separate but identical armature windings acted on by one system of rotating magnets

B

Each has one armature winding acted on by three identical but separate systems of rotating magnets

C

All three-phase alternators are designed to operate with a O8 leading power factor

D

The three phases always provide power to the load through three sets of slip rings and brushes

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更多“Which of the following statements is true concerning all thr”相关问题

  • 第1题：

    Which of the following is true concerning Frame Relay multipoint subinterfaces?（）

    • A、An IP address is required on the physical interface of the central router.
    • B、All routers are required to be fully meshed.
    • C、All routers must be in the same subnet to forward routing updates and broadcasts.
    • D、Multipoint is the default configuration for Frame Relay subinterfaces.

    正确答案:C

  • 第2题：

    Which statements concerning the value of a member variable are true， when no explicit assignments have been made？（）  

    • A、The value of an int is undetermined.
    • B、The value of all numeric types is zero.
    • C、The compiler may issue an error if the variable is used before it is initialized.
    • D、The value of a String variable is "" （empty string）.
    • E、The value of all object variables is null.

    正确答案:B,E

  • 第3题：

    The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command（）。

    • A、This command should be executed from the global configuration mode
    • B、The IP address 10.121.16.8 is the local router port used to forward data
    • C、102 is the remote DLCI that will receive the information
    • D、This command is required for all Frame Relay configurations
    • E、The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC

    正确答案:E

  • 第4题：

    单选题
    Which of the following statements concerning energy is correct?（）
    A

    Energy can be created or destroyed

    B

    Energy may not be transformed

    C

    The total quantity of energy in the universe is always the same

    D

    None of the above


    正确答案： D
    解析： 暂无解析

  • 第5题：

    多选题
    Concerning the figure below, if a =b, which of the following statements must be true? (Indicate all such statements.)
    A

    c=d

    B

    l and k are parallel

    C

    m and l are perpendicular


    正确答案： C,B
    解析：
    根据题目中的已知信息无法推断出各直线的关系，因此B、C均不正确；而由图示可知，c和d分别是a和b的补角，由于a=b，所以c=d，A项正确。

  • 第6题：

    单选题
    Which of the following statements is not true concerning symptom of a fire in the scavenge air box?（）
    A

    an increase in the exhaust temperature of the affected cylinder

    B

    the turbocharger may surge

    C

    the explosion pressure in all cylinders will rise violently

    D

    smoke from the turbocharger air inlet filter will be seen


    正确答案： D
    解析： 暂无解析

  • 第7题：

    多选题
    Which statements concerning the value of a member variable are true， when no explicit assignments have been made？（）
    A

    The value of an int is undetermined.

    B

    The value of all numeric types is zero.

    C

    The compiler may issue an error if the variable is used before it is initialized.

    D

    The value of a String variable is  （empty string）.

    E

    The value of all object variables is null.


    正确答案： B,E
    解析： 暂无解析

  • 第8题：

    单选题
    Which of the following statements is true concerning the overall efficiency of air compressors?（）
    A

    High pressure compressors are more efficient than low pressure compressors

    B

    Mechanical efficiency divided by compressor efficiency will equal the overall efficiency of the compressor unit

    C

    Two stage compressors are generally more efficient than single stage compressors

    D

    The volumetric efficiency is decreased in multistage compressors


    正确答案： B
    解析： 暂无解析

  • 第9题：

    单选题
    Which of the following statements is true concerning any evaporator?（）
    A

    High conductivity of the distillate indicates distillate salinity is excessive

    B

    Increasing the absolute pressure of the shell will increase the distillers capacity

    C

    Mesh separators are used in evaporators to filter the distillate

    D

    Reducing the brine density will reduce the heat lost overboard


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    Which of the following statements is true concerning the cetane number of diesel fuel?（）
    A

    The cetane number affects the amount of injection lag

    B

    The cetane number is an indication of the fuels viscosity

    C

    Ignition lag is reduced with fuels having a high cetane number

    D

    The cetane number is of little significance in the combustion process


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    Which of the following statements is true concerning an oil cooler?（）
    A

    The oil temperature is less than the cooling water temperature

    B

    The oil pressure is less than the cooling water pressure

    C

    The oil pressure is greater than the cooling water pressure

    D

    The oil flow control valve is always installed in the oil input line


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    Which of the following statements is true concerning simple parallel resistance circuits?（）
    A

    The total current flow equals the sum of the individual currents

    B

    The total current flow equals the reciprocal of the sum of the individual currents

    C

    The total resistance equals the sum of the individual resistance

    D

    The total voltage equals the sum of the individual voltages across each resistance


    正确答案： A
    解析： 暂无解析

  • 第13题：

    The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command？（）

    • A、This command should be executed from the global configuration mode.
    • B、The IP address 10.121.16.8 is the local router port used to forward data.
    • C、102 is the remote DLCI that will receive the information.
    • D、This command is required for all Frame Relay configurations.
    • E、The broadcast option allows packets， such as RIP updates， to be forwarded across the PVC

    正确答案:E

  • 第14题：

    Which statements are true concerning NAT？ （）

    • A、 NAT provides 1 to manyaddress mapping.
    • B、 NAT provides 1 to 1 address mapping.
    • C、 NAT is only useful forTCP/UDP and ICMP traffic.
    • D、 NAT can be used for all IP traffic.

    正确答案:B,D

  • 第15题：

    Which of these statements concerning the collection interfaces are true？（）  

    • A、Set extends Collection.
    • B、All methods defined in Set are also defined in Collection.
    • C、List extends Collection.
    • D、All methods defined in List are also defined in Collection.
    • E、Map extends Collection.

    正确答案:A,B,C

  • 第16题：

    多选题
    If p and q are primes greater than 2, which of the following statements must be true? (Indicate all such statements.)
    A

    p + q is even

    B

    pq is odd

    C

    p2-q2 is even


    正确答案： A,B
    解析：
    由于所有大于2的质数都是奇数，因此p和q均是奇数，两奇数相加为偶数，所以A项正确；两奇数的乘积还是奇数，所以B项正确；两奇数的平方还各自是奇数，而两奇数的平方之差是偶数，因此C项也正确；所以选择A、B、C三项。

  • 第17题：

    多选题
    Which of the following statements are true? (Indicate all such statements.)
    A

    τ(5) =τ(7)

    B

    τ(5) τ(7) =τ(35)

    C

    τ(5) + τ(7) =τ(12)


    正确答案： A,B
    解析：
    5和7均只有两个正除数，因此根据题干信息，A项正确；35有四个正除数，所以B项也是正确的；12有6个正除数，因此C项错误；选择A、B两项。

  • 第18题：

    单选题
    Which of the following statements is NOT true?
    A

    People may have different personalities.

    B

    People differ from each other in appearance.

    C

    People can learn to recognize human faces.

    D

    People can describe all human features of others.


    正确答案： B
    解析：
    结论推断题。答案出处为文章第一段：Even a skilled writer probably could not describe all the features that make a face difference from another. A, B, C三项均可以在原文第一、二段找到对应表述。

  • 第19题：

    单选题
    The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command（）。
    A

    This command should be executed from the global configuration mode

    B

    The IP address 10.121.16.8 is the local router port used to forward data

    C

    102 is the remote DLCI that will receive the information

    D

    This command is required for all Frame Relay configurations

    E

    The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC


    正确答案： C
    解析： 暂无解析

  • 第20题：

    单选题
    Which of the following statements is true concerning centrifugal pumps?（）
    A

    They are particularly suited for pumping high viscosity fluids

    B

    They are started with the discharge valve opened

    C

    The flow of liquid is developed by imparting energy due to the rotation of an impeller

    D

    They are always mounted in a horizontal position


    正确答案： C
    解析： 暂无解析

  • 第21题：

    单选题
    Which of the following statements concerning fire-tube boilers is correct?（）
    A

    Combustion gases flow through the tubes

    B

    Flames impinge on the tubes

    C

    Combustion occurs in the tubes

    D

    Water flows through the tubes


    正确答案： D
    解析： 暂无解析

  • 第22题：

    单选题
    Which of the following statements is not true?
    A

    Henry Ford influenced our lives.

    B

    Henry Ford influenced historians.

    C

    Henry Ford influenced all manufacturing.


    正确答案： A
    解析：
    选项A和C分别于第一段前两句相对应。选项B在文中并未提及。

  • 第23题：

    多选题
    Which of the following statements are true concerning the command ip sla monitor responder typetcpconnect ipaddress 10.1.1.1 port 23？（Choose all that apply.）（）
    A

    The command will initiate a probe with a destination IP address of 10.1.1.1

    B

    The command is used on the IP SLA responder and the IP SLA source

    C

    The command will allow only source address 10.1.1.1 to source probes

    D

    The command will initiate a probe with a destination Telnet port

    E

    The command is used to make the router a responder

    F

    The command will initiate a probe with a source port of 23


    正确答案： A,B
    解析： 暂无解析

  • 第24题：

    单选题
    Which of the following statements is true concerning Halon 1301 fire extinguishing equipment?（）
    A

    The agent is considered nontoxic at room temperature in low concentrations

    B

    The agent is less effective than carbon dioxide

    C

    Halon primarily extinguishes the fire by cooling

    D

    The agent cannot be used on electrical fires because it leaves a residue


    正确答案： B
    解析： 暂无解析

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