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【单选题】

The switchboards are those in which all the live parts are installed behind the panels and only the operating handles and instruments are on the front（）

A、open

B、open front type

C、live front type

D、dead front type

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更多“The switchboards are those in which all the live parts are installed behind the panels and only the operating handles and instruments are on the front（）”相关的问题
第1题
[] Switchboards may be of the dead-front type in which all live parts are installed behind （） and only the operation handles and instruments are on the front.

A、A.the capstan  B、B.the collector  C、C.the panels  D、D.the surface  

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第2题
[单选题] The switchboards for a-csystems differ from the d-cswitch gear in that the open type panels are generally（） and the dead-front switch gear is the common rule.

A、permissibly  B、permissible  C、no permissible  D、not permissible  

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第3题
[单选题] It is well known that the whole power distribution of the ship’s electrical services mainly depend on the（）.

A、sub-boards  B、main switchboards  C、emergency switchboards  D、distribution boards  

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第4题
[] （）on board ship are used to control and distribute the electrical energy generated by generators.

A、A.Governors  B、B.Alternators  C、C.Blackboards  D、D.Switchboards  

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第5题
[] （）are located on the road panel of main switchboard.

A、A.Megohm meter, insulation light and synchroscope  B、B.Synchroscope, synchro light and megohm meter  C、C.Shore power switch, insulation light and synchroscope  D、D.Megohm meter, insulation light and shore power switch  

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第6题
[单选题] The frequency of an alternator is controlled from the main switchboard by adjusting the（）

A、frequency meter  B、voltage regulator  C、governor control  D、sychroscope switch  

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第7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  

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第8题
[单选题] An alternator switchboard has a synchroscope and synchronizing lamps, if the synchroscope is broken, which of the steps listed is the most essential before an alternator can be paralleled with the bus （）

A、The breaker should be closed when one synchronizing lamp is dark and the other is bright  B、The breaker should be closed when both synchronizing lamps are bright  C、The frequency meter should be used to determine that the incoming alternator frequency is slightly higher than the bus  D、A portable phase sequence indicator must be used to verify the information from the lamps  

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第9题
[单选题] The most likely place for a fire to start through the process of spontaneous combustion is in （）.

A、an electrical switchboard  B、the pressure tanks  C、the fuel oil tanks  D、the oily rag bin  

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