What does not belong to the four-rem

单选题

What does not belong to the four-remote function of SCADA system is？

A、

Remote control

B、

Remote measuring

C、

Remote signaling

D、

Remote sensing

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单选题 Among the following LV loads of urban rail, those belong to Level III loads are ( )

A、

Escalator

B、

Main drainage pump

C、

Air conditioner

D、

smoke exhaust fan

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单选题 When the distribution network adopts the neutral ungrounded mode, the time for the system to operate with fault after a single-phase grounding fault occurs shall not exceed？

A、

2.0

B、

1.5

C、

1.0

D、

0.5

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单选题 ^{关于城轨供电系统主变电所的选址说法不正确的是？}

A、

应和城市规划、城市电网规划相协调。

B、

应尽量邻近城市轨道交通线路布置

C、

对城市配电网的网络结构、提供电质量和运行经济性没有影响

D、

主变电所位置直接影响变电所工程投资和运行的经济效益

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单选题 Those not belonging to power grid equipment？

A、

Step-up transformer

B、

Power line

C、

Step-down transformer

D、

Generator

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单选题 The power supply system of traction network in China does not include

A、

DC 1000 V conductor rail

B、

DC 1 500 V overhead catenary

C、

DC 750 V overhead catenary

D、

DC 750 V conductor rail

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单选题 At present, most of the main substations for urban rail transit in China are equipped with ( ) main transformers.

A、

B、

C、

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单选题 ^{The suspension type not belonging to flexible overhead contact line is？}

A、

Chain suspension

B、

_{Rigid body suspension}

C、

Elastic simple suspension

D、

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单选题

Among the following LV loads of urban rail, those not belonging to Class II load are?

A、

Emergency lighting

B、

Blowdown pump

C、

Ordinary fan

D、

Elevator

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