EXIN EXIN-CDCP Online Practice Questions and Exam Preparation

EXIN EXIN-CDCP Online Questions & Answers

• Question 11:

  The temperature and humidity values indicated on the display of the Computer room air conditioner unit are the values measured at which point?

  A. It is the average value between the intake and exhaust (outlet) of the air conditioner.
  B. It is the value measured at the intake of the air conditioner.
  C. It is the value measured at the exhaust (outlet) of the air conditioner.
  D. It is the value measured at the front of the rack of the aisle the air conditioner is situated.
  B. It is the value measured at the intake of the air conditioner.

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  Explanation

  According to the IBM document on temperature and humidity design criteria, the temperature and humidity values indicated on the display of the computer room air conditioner unit are the values measured at the intake of the air conditioner. This is because the intake is where the air conditioner draws the air from the computer room and cools and dehumidifies it before sending it back to the computer room. The display shows the current conditions of the computer room air, which are used to adjust the cooling and dehumidifying operations of the air conditioner. The values measured at the exhaust (outlet) of the air conditioner are not displayed, as they are not relevant for the computer room environment. The values measured at the front of the rack of the aisle the air conditioner is situated are also not displayed, as they may vary depending on the distance and location of the rack. The average value between the intake and exhaust (outlet) of the air conditioner is not displayed, as it does not reflect the actual conditions of the computer room air or the air conditioner performance.

  References:

  Temperature and humidity design criteria - IBM

• Question 12:

  The UPS vendor is offering the latest model of their UPS to you. The vendor indicates that the UPS is categorized as VFD class.

  Is this UPS a fit for your mission-critical data centre?

  A. Yes
  B. No
  C. Yes, but only if you oversize the battery bank with 10%.
  D. Yes, but only if they install it with a 12-pulse rectifier.
  B. No

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  Explanation

  A UPS (uninterruptible power supply) that is categorized as VFD class is not a fit for your mission-critical data centre, because it does not provide adequate protection against voltage and frequency variations.

  VFD stands for Voltage and Frequency Dependent, which means that the output voltage and frequency of the UPS depend on the input voltage and frequency. VFD UPSs are also known as offline, standby, or line-interactive UPSs. They typically switch to battery power only when the input power fails or goes beyond a certain threshold. However, this switching may cause a brief interruption or a transient in the output power, which can affect the performance and reliability of the ICT equipment. Moreover, VFD UPSs do not filter or regulate the input power, which means that they pass on any voltage or frequency fluctuations, harmonics, or noise to the output power. These power quality issues can also damage or degrade the ICT equipment and the data.

  For your mission-critical data centre, you need a UPS that is categorized as VFI class, which stands for Voltage and Frequency Independent. VFI UPSs are also known as online, continuous, or double-conversion UPSs. They provide a constant and clean output power that is independent of the input power.

  VFI UPSs convert the input AC power to DC power, and then convert it back to AC power with the desired voltage and frequency. This double conversion process isolates the output power from the input power, and eliminates any power quality issues. VFI UPSs also have zero switching time, which means that they do not cause any interruption or transient in the output power when switching to battery power. VFI UPSs are designed to protect the ICT equipment and the data from any adverse effects of voltage and frequency variations, and to ensure the highest level of availability and reliability.

• Question 13:

  A data centre team is planning a room expansion.

  Which action most directly supports safe future growth?

  A. Fill all available floor space during the initial installation
  B. Reserve service access and expansion paths in the layout
  C. Place new equipment wherever the shortest cable route is available
  D. Delay all layout decisions until the new equipment arrives
  B. Reserve service access and expansion paths in the layout

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  Explanation

  Reserved access and expansion paths allow equipment to be added and maintained without obstructing existing systems. Filling space or making placement decisions only from cable length can create access, safety, and capacity problems.

• Question 14:

  What is the minimum clearance space required below water sprinkler heads and nozzles of gas-based fire suppression systems?

  A. 46 cm / 18 inches
  B. 64 cm / 25 inches
  C. 60 cm / 24 inches
  D. 120 cm / 47 inches
  A. 46 cm / 18 inches

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  Explanation

  The minimum clearance space required below water sprinkler heads and nozzles of gas-based fire suppression systems is 46 cm / 18 inches, according to the CDCP Preparation Guide1 and OSHA regulation 29 CFR 1910.159 ?(10)2. This clearance space is necessary to ensure that the sprinkler spray or gas discharge can reach the fire and cover the protected area effectively. Any material or obstruction below this clearance space can interfere with the sprinkler or gas distribution and reduce the fire suppression performance. Therefore, building owners and managers should ensure that all storage and objects in the data centre are kept below this clearance space, and that the clearance space is maintained at all times.

• Question 15:

  Which type of Fire Detection Device is recommended for protecting a Data Center?

  A. Heat detector
  B. Smoke detector
  C. Flame detector
  D. None of the above
  B. Smoke detector

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  Explanation

  According to the CDCP?Preparation Guide, smoke detectors are the most common type of fire detection devices used in data centers, as they can detect a fire in its early stages and provide early warning to the occupants and authorities. Smoke detectors can be either spot-type or air-aspirating, depending on the design and goals of the data center. Spot-type detectors are inexpensive and simple, but may cause activation delay and false alarms. Air-aspirating detectors are more sensitive and reliable, but may require more maintenance and installation costs. Both types of detectors should be installed in accordance with the relevant standards and codes, such as NFPA 72 and EN 54.

• Question 16:

  The same minor alarm appears every week and is cleared without investigation.

  What should the operations team do?

  A. Lower the alarm priority until it is ignored
  B. Replace the entire monitoring system
  C. Investigate the recurring cause and track corrective action
  D. Record fewer details to shorten each response
  C. Investigate the recurring cause and track corrective action

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  Explanation

  A repeating alarm indicates an unresolved condition or an ineffective alarm configuration. Cause analysis and tracked corrective action address recurrence rather than repeatedly treating the symptom.

• Question 17:

  Which is the most damaging type of floor load?

  A. Concentrated Load / Point Load (CP/ PL)
  B. Uniformly Distributed Load (UDL)
  C. Rolling Load (RL)
  D. All loads are equally damaging to raised floor tiles
  C. Rolling Load (RL)

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  Explanation

  The most damaging type of floor load for raised floor tiles in a data centre is the rolling load (RL), according to the CDCP Preparation Guide and various web sources 234. A rolling load is the load that is applied by a moving object, such as a pallet jack, a forklift, or a rack on wheels. A rolling load can cause more stress and fatigue on the raised floor tiles than a static load, such as a concentrated load (CP) or a uniformly distributed load (UDL), because it creates dynamic forces and impacts that can crack, dent, or deform the tiles.

  Moreover, a rolling load can also damage the pedestals and stringers that support the tiles, and cause the tiles to become loose or misaligned. Therefore, when designing and installing a raised floor system, it is important to consider the maximum rolling load that the tiles can withstand, and to use appropriate materials and methods to enhance the strength and durability of the tiles. For example, some possible solutions include using steel or concrete-filled tiles, reinforcing the edges and corners of the tiles, and using locking or gravity-held systems to secure the tiles.

• Question 18:

  After service is restored from an incident, what should the team do next?

  A. Remove the incident record because the service is available
  B. Review the event, identify causes, and assign follow-up actions
  C. Avoid discussing the event to protect staff confidence
  D. Repeat the recovery steps during normal operation
  B. Review the event, identify causes, and assign follow-up actions

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  Explanation

  Restoration ends the immediate outage but does not remove the underlying cause. A structured review converts evidence from the event into corrective and preventive actions with clear ownership.

• Question 19:

  A review finds that an approved procedure is consistently bypassed because it cannot be performed as written.

  What should management do?

  A. Punish the next operator without examining the procedure
  B. Ignore the issue because work is still being completed
  C. Evaluate the cause, correct the procedure or conditions, and reinforce control
  D. Remove all procedures from the operation
  C. Evaluate the cause, correct the procedure or conditions, and reinforce control

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  Explanation

  Consistent bypassing may indicate that the documented method, available resources, or working conditions are unsuitable. Correcting the cause and restoring an executable control is more effective than ignoring the gap or applying punishment alone.

• Question 20:

  When designing a data centre with a raised-floor setup, where should the air conditioners be placed?

  A. Perpendicular to the hot aisle
  B. Perpendicular to the cold aisle
  C. Close to the entrance door to create an air curtain to avoid hot comes into the computer room
  D. Perpendicular to the side of the rack
  A. Perpendicular to the hot aisle