EXIN EXIN-CDCP Online Practice Questions and Exam Preparation

EXIN EXIN-CDCP Online Questions & Answers

• Question 101:

  A UPS has an internal battery tester, do you still need to separately test the batteries at block level?

  A. No, as mentioned the battery tester is already built-in the UPS.
  B. No, the UPS will automatically generate and alarm when de battery voltage is too low to operate.
  C. Yes, the UPS will only test the batteries at string level which only gives an indication on the overall status of the battery string. Measurements at block level will provide more detailed information on thestatus and remaining lifetime of the batteries itself.
  D. Testing batteries using the built-in battery tester or resting the batteries at block level does not increase the battery lifetime, therefore it is not recommended.
  C. Yes, the UPS will only test the batteries at string level which only gives an indication on the overall status of the battery string. Measurements at block level will provide more detailed information on thestatus and remaining lifetime of the batteries itself.

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  Explanation

  Block-level testing identifies weak or failing individual batteries that may not show up in string-level tests, enhancing overall system reliability.

  References:

  CDCP Exam Preparation Guide, Power/UPS Maintenance

• Question 102:

  What should be a consideration when having casters (rollers/wheels) or feet under the rack?

  A. The casters and feet should be larger to avoid a too heavy point load on the floor tile.
  B. Skirts at the bottom of the rack to avoid air flow between the hot and cold aisles.
  C. Casters and feet should be of a soft material, for example rubber, to avoid damage to the raised floor tile.
  D. Casters and feet should not be locked to ensure the racks are still able to be moved to another position.
  A. The casters and feet should be larger to avoid a too heavy point load on the floor tile.

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  Explanation

  The casters and feet under the rack are used to support the weight of the rack and its equipment, and to allow the rack to be moved if needed. However, the casters and feet should also be designed to avoid putting too much pressure on the floor tile, especially if the data centre uses a raised floor system. A too heavy point load on the floor tile can cause the tile to crack, deform, or collapse, which can damage the rack, the equipment, and the underlying infrastructure. To prevent this, the casters and feet should be larger, so that they can distribute the weight over a larger area and reduce the point load. The casters and feet should also be compatible with the floor type and the load rating of the floor tile.

• Question 103:

  Which one of the following is an example of Indirect Cost?

  A. Legal fees
  B. Damaged brand perception
  C. System recovery
  D. Cost revenues
  B. Damaged brand perception

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  Explanation

  Damaged brand perception is an example of an indirect cost because it is not directly related to a specific product or service, but rather to the overall reputation and image of the company. Damaged brand perception can result from various factors, such as poor quality, customer dissatisfaction, security breaches, or negative publicity. Damaged brandperception can affect the company's ability to attract and retain customers, partners, and investors, and thus reduce its profitability and competitiveness.

• Question 104:

  What is the recommended level of Common Mode Noise (CMN)?

  A. > 10 Volt measured at the rack level
  B. > 5 Volt measured at the rack level
  C. Preferred to be < 1 Volt with a maximum of 3 Volt
  D. CMN has r>o effect on ICTequipment so any level is ok
  C. Preferred to be < 1 Volt with a maximum of 3 Volt

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  Explanation

  As per Certified Data Centre Professional (CDCP(R)) reference materials, Common Mode Noise (CMN) is a type of electrical noise that appears equally on the line and neutral wires with respect to ground, and i t can negatively affect sensitive ICT equipment. Excessive CMN at the rack level can lead to data error s, communication problems, equipment malfunctions, or even hardware dama ge. The CDCP(R) training and the official exam preparation guide specify that the preferred level of Co mmon Mode Noise at the rack should be less than 1 Volt, and under no circumstances should it exceed 3 V olts. Keeping CMN at these levels helps ensure the stable and reliable operation of critical data center infrastructure. Higher CMN levels indicate grounding or bonding issues, or possibly interferen ce from electrical or mechanical sources, and must be addressed promptly. Options A and B (CMN above 5 or 10 Volts) are not acceptable and would present a serious risk to ICT equipment operation and data integrity.

  Option D is incorrect, as CMN absolutely does affect ICT equipment.

  EPI CDCP(R) Exam Preparation Guide:

  https://www.epi-ap.com/uploads/file/exam%20prep/english_preparation_guide_cdcp_202003.pdf

  EPI Certified Data Centre Professional (CDCP(R))

  Course Content:

  https://www.epi-ap.com/services/1/3/4/Certified_Data_Centre_Professional_(CDCP)

  EPI Data Centre Framework:

  https://www.epi-ap.com/content/31/67/EPI_Data_Centre_Framework

• Question 105:

  How many monitoring points should be used in Temperature Measurement?

  A. 1
  B. 2
  C. 3
  D. 4
  C. 3

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  Explanation

  According to the EPI Data Centre Professional (CDCP? Reference Materials, the recommended number of monitoring points for temperature measurement in a data centre is 3 per rack: one at the top, one at the middle, and one at the bottom. This is to ensure that the temperature distribution within the rack is uniform and within the acceptable range for the equipment. The temperature sensors should be placed at the front of the rack, where the air enters the equipment, and not at the back, where the hot air exits.

• Question 106:

  Which one of the following is a device that uses circulating chilled water to remove heat?

  A. Computer Room Air Handling Unit (CRAH)
  B. Computer Room Air System Unit (CRAS)
  C. Computer Room Air Suspension Unit (CRAS)
  D. Computer Room Air Suppression Unit (CRAS)
  A. Computer Room Air Handling Unit (CRAH)

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  Explanation

  A computer room air handling unit (CRAH) is a device that uses circulating chilled water to remove heat from the data center environment. A CRAH consists of a fan, a coil, and a filter. The fan draws the warm air from the data center and passes it through the coil, where the heat is transferred to the chilled water.

  The chilled water is supplied by a chiller or a cooling tower, and the cooled air is returned to the data center.

  A CRAH is different from a computer room air conditioning unit (CRAC), which uses a refrigerant instead of chilled water to cool the air.

• Question 107:

  Which one of the following represents the three elements (oxygen, heat and fuel) to interact in order for the fire to exist?

  A. The Fire Hexagon
  B. The Fire Class
  C. The Fire Triangle
  D. The Fire Technology
  C. The Fire Triangle

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  Explanation

  The fire triangle is a simple model that illustrates the three elements a fire needs to ignite: heat, fuel, and an oxidizing agent (usually oxygen). A fire naturally occurs when the elementsare present and combined in the right mixture. A fire can be prevented or extinguished by removing any one of the elements in the fire triangle.

  References:

  EPI Data Centre Professional (CDCP? Preparation Guide, page 9

  Fire triangle - Wikipedia;

  The Fire Triangle Explained - Fire Action

• Question 108:

  Does shielded twisted pair network cabling provide protection against EMF from power cables?

  A. Yes, but only if the power cable is placed in a tre-foil cable arrangement.
  B. Yes, as the shielding for twisted pair network cabling is specifically design for low frequency EMF protection.
  C. No, the shielding is designed for alien cross-talk between network cables, it provides no or little protection against low frequency EMF.
  D. No, the shielding for twisted pair network cabling is for physical protection against vandalism and accidental cutting of the cable.
  C. No, the shielding is designed for alien cross-talk between network cables, it provides no or little protection against low frequency EMF.

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  Explanation

  Shielded twisted pair cables (STP) are Ethernet cables that feature additional protection against electromagnetic interference from external sources, such as radio waves, microwaves, or other network cables. This is achieved by wrapping each pair of wires with a conductive shield, usually made of foil or braided wire, and then enclosing the entire cable with another shield layer. However, this shielding is not effective against low frequency electromagnetic fields (EMF) from power cables, which can induce currents and voltages in the network cables and cause signal distortion or data loss. Low frequency EMF can only be reduced by increasing the distance between the power and network cables, or by using a tre-foil cable arrangement, which is a special configuration of three power cables twisted together to cancel out the magnetic fields they generate.

• Question 109:

  Do I need to check the local standards if I already comply to international standards?

  A. Local standards do not to be checked as some countries have too many local standards, which will slow down the data centre construction.
  B. You need to check the local standards to ensure compliance to these standards.
  C. Compliance to only international standards is good enough as most local standards are derived from international standards.
  D. Data centres only need to comply to international standards since they are connected to a worldwide international network infrastructure.
  B. You need to check the local standards to ensure compliance to these standards.

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  Explanation

  Data centre design and infrastructure standards can vary from country to country, depending on the local regulations, codes, and practices. Therefore, it is important to check the local standards before designing, building, or operating a data centre in a specific location. Compliance to only international standards may not be sufficient or adequate to meet the local requirements, which could result in legal, financial, or operational risks. For example, some countries may have stricter fire safety, environmental, or energy efficiency standards than the international ones. Some countries may also have different electrical standards, such as voltage, frequency, or plug types. By checking the local standards, you can ensure that your data centre is compliant, safe, and efficient in the local context.

• Question 110:

  Which Class of Fire involves combustible metals or combustible metal alloys such as magnesium, sodium and potassium?

  A. Class A
  B. Class B
  C. Class C
  D. Class D
  D. Class D

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  Explanation

  Class D fires involve combustible metals or combustible metal alloys such as magnesium, sodium and potassium. These metals can react violently with water, air, or other chemicals, and require special extinguishing agents