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1题

[单选题] An alternative to plain old telephone service (POTS) would be:（）

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第2题

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

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第3题

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A、alternation B、alternate C、alter D、alternative

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第4题

[] An alternating light（）.

A、A.shows a light with varying lengths of the lighted period B、B.shows a light that changes color C、C.marks an alternate lesser-used channel D、D.is used as a replacement for another light

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第5题

[单选题] A new Catalyst switch is connected to an existing switch using a crossover cable. As a result of this, what would the switch port link lights display?（）

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第6题

[多选题] An administrator would like to configure a switch over a virtual terminal connection from locations outside of the local LAN. Which of the following are required in order for the switch to be configured from a remote location?（）

A、The switch must be configured with an IP address, subnet mask, and default gateway. B、The switch must be connected to a router over a VLAN trunk. C、The switch must be reachable through a port connected to its management VLAN. D、The switch console port must be connected to the Ethernet LAN. E、The switch management VLAN must be created and have a membership of at least one switch port. F、The switch must be fully configured as an SNMP agent.