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Share some HCNA-DCF H12-411-ENU exam questions and answers below.
UPS inverter components can achieve the conversion from AC to DC.
A. True
B. False
Compressor is the heart of the refrigeration cycle, is the power plant of the refrigerant in the system inner loop, the low temperature and low pressure steam from the evaporator is compressed into high temperature and pressure steam.
A. True
B. False
Answer: A
Battery slot of lead-acid battery is used to hold the electrolyte, plates, partitions, and so on.
A. True
B. False
Answer: A
High sensible heat ratio is the only difference between a precision air conditioner and a residential air conditioner.
A. True
B. False
Answer: B
When using the PoE (Power over Ethernet) interface, there are two functions of passing and supplying power.
A. True
B. False
Answer: A
Which of the following is advantages of the UPS 2N system? (Multiple choice)
A. Power supply redundancy
B. The UPS system can be serviced without switching the load to maintenance bypass mode
C. no single path fault point
D. numerous redundant components, high cost
Answer: ABC
Which fire extinguishing agent is mainly used in data center fire protection system?
A. Heptafluoropropane
B. water
C. Haloalkanes
D. Halon 1301
Answer: A
Valve-regulated lead-acid battery safety valve has ( ) function. (Multiple choice)
A. Adjust the battery pressure inside and outside
B. filter acid mist
C. Flame retardant
D. Anti-battery internal pollution
Answer: ABD
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