What is the critical element of a conventional starter motor in a generator?
A. Battery
B. Starter cables
C. Engine block heater D. Automatic charging system
In which heat rejection system is the compressor located outside of the CRAC unit?
A. Chilled water systems
B. Water cooled systems
C. Glycol cooled systems
D. Air cooled self-contained systems
Which three statements describe a circuit breaker? (Choose three.)
A. It regulates voltage.
B. It is a type of switch.
C. It serves as a best source selector.
D. It comes in a wide range of voltages and amps.
E. It is designed to protect electrical equipment from damage caused by overload or short circuit.
Which benefit is provided when air distribution methods return the warmest air to the CRAC units?
A. Decreased heat load in the data center
B. Increased capacity of the cooling system
C. Maximized mixing of supply and return air
D. Elimination of resistance created by underfloor cables
Why will touching a doorknob after walking across a carpet only cause a slightly painful spark, but touching a live utility wire inside the data center could cause death?
A. The utility company's voltage is much higher than that of the spark.
B. The spark generates DC power but the utility company generates AC power.
C. The current available from a spark is much less than the current available from the utility company.
D. The human skin has a high enough resistance to keep from being hurt from the spark's voltage but not from the utility company's voltage.
To maximize the effectiveness of data center supply air distribution, where should perforated tiles in a raised floor environment be placed?
A. In the hot aisle only
B. In the cold aisle only
C. In equal amounts in both hot and cold aisles
D. Primarily in the hot aisle with some on the perimeter of room
Hot aisle containment systems serve which primary function?
A. They enclose the top and bottom of racks to balance hot and cold air.
B. They enclose the rear of racks to ensure mixing of hot and cold air.
C. They enclose the front of racks to ensure reliable supply air delivery.
D. They enclose the rear of racks to prevent mixing of hot and cold air.
Perimeter CRAC units discharge into the raised floor space, and perforated tiles exist in front of the IT equipment racks. No other air management devices are present in the space.
This is an example of which type of air distribution system?
A. Flooded supply, flooded return
B. Flooded supply, fully ducted return
C. Flooded supply, locally ducted return
D. Locally ducted supply, flooded return
The outlet of a perimeter CRAC unit is connected to duct work which feeds conditioned air to the aisle above the front of the IT equipment racks. No other air management devices are present in the space.
This is an example of which type of air distribution system?
A. Flooded supply, flooded return
B. Flooded supply, fully ducted return
C. Flooded supply, locally ducted return
D. Locally ducted supply, flooded return
The rear of an IT equipment rack is fitted with a fan-assist device that is connected to a drop ceiling plenum, which is in turn connected to the perimeter CRAC unit.
This is an example of which type of air distribution system?
A. Flooded supply
B. Fully ducted return
C. Locally ducted return
D. Locally ducted supply
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