CDCP EXAMINATION 2022- ĐỀ 02

98- What is the recommended maximum load imbalance between the three-phase electrical supply?

• Approx 0% - 5%
• Approx 5% - 10%
• Approx 10% - 15%
• Approx 15% - 20%

99- What is the recommended way to reduce Common Mode Noise (CMN) in the data center?

• Install an isolation transformer
• Install a true online double conversion UPS
• Install the UPS as far as possible away from the ICT equipment
• Use PDU's with form factor-4b Type 7

103- What is one of the most important questions when starting a data centre build project?

• In which country is the data centre going to be built
• How many project leaders will manage the project
• Which standard will be applied to design the data centre
• What is the cost of down time?

106- What factor do not influence the lifespan of SLA/VRLA batteries?

• Ripple voltage/current
• Enviroment temperature
• Number of discharges and level of each discharge
• UPS output power (kW)

107- What is an advantage and/or disadvantage of using a Glycol based air conditioner?

• One condenser could connect to multiple air-conditioner untils inside the computer room
• One air-conditioner until could connect to multiple condensers
• Air-conditioner to condenser distance is limit to 18 meter / 59 feet
• Air-conditioner to condenser distance must be at least 18 meter / 59 feet

110- What is the requirement or preference for shielded or unshielded network copper cabling?

• The standards and equipment manufacturers have no preference
• The standard recommend shielded, equipment manufactures have no preference
• The equipment manufactures recommended shielded, standards have no preference
• The standards and equipment manufactures both prefer shielded

111- What is the advantage/ disadvantage of Novec-1230?

• It is a clear gas upon discharge
• It allows the gas containers (tanks) to be installed far from the haszard area where the gas will be released
• It needs to be refilled at the factory
• It is a high-pressure gas, therefore nozzles must be mounted with two brackets

117- What is the most common 'marketing name' use for a VFI class UPS system?

• Offline UPS
• Line Interactive UPS
• Hybrid UPS
• True online double conversion UPSUPS

119- What is the advantage or disadvantage of wider rack, e.g. 24" inch racks?

• Wider racks will reduce the number of racks in a computer room and are not needed as all equipment fits inside 19" inch racks.
• Wider racks allow easier cable mannagement for high density cabling enviroments, but it will case misalignment with the standard sized
• Wider racks allow for in-row rack coolers to be placed inside the racks
• Wider racks provide additional space within the rack for space parts related to the equipment inside the rack, therefore improving service

120- What is the maximum combined cabling/channel length for structured copper cabling?

• Maximum 100 meter/330 feet
• Maximum 90 meter/295 feet
• Maximum 75 meter/245 feet
• Maximum 60 meter/197 feet