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Question 1

Regarding the use of circuit breakers, which of the following descriptions are correct?

Options :

A :

A frame circuit breaker can be used for low-voltage main distribution cabinets where the incoming current is very large

B :

A plastic shell circuit breaker should be used for a precision air conditioner with a cooling capacity of 42kW; a miniature circuit breaker cannot be used.

C :

A miniature circuit breaker can be used in precision distribution cabinets.

D :

A plastic shell circuit breaker can be used for a 200kVA UPS distribution cabinet.

Answer: A,C,D

Question 2

For a data center with a standard designation of GB50174-A, which of the following descriptions regarding the load classification is incorrect?

Options :

A : IT load is a crucial load in the first-level load category.

B : Chilled water units are classified as first-level loads.

C : Fire safety equipment in the machine room is classified as second-level load.

D : Cooling towers and chilled water pumps are classified as first-level loads.

Answer: C

Question 3

According to GB50174-2017, data centers using chilled water cooling systems should have thermal storage devices, with storage time meeting operational needs. Is this correct?

Options :

A : Yes

B : No

Answer: B

Question 4

In a data center where precision cooling units are supplied by single-phase power, using dual power supplies and ATS for switching can meet Tier III requirements if both units share a single ATS.

Options :

A : True

B : False

Answer: B

Question 5

If a cooling system uses a DX scheme, it can plan the deployment sequence of the air handling units and outdoor units accordingly.

Options :

A : True

B : False

Answer: A