EXIN EPI Data Centre CDCP Questions & Answers

• Question 1:

  What is the best practice for cutting holes in the raised floor tile?

  A. Anywhere as data centre tiles are designed to allow cut-outs anywhere.

  B. Draw a cross on the tile and when making a cut-out do not touch a line and avoid the corners.

  C. Draw a line in the middle of the tile and never touch the line when making the cut.

  D. Cut the tiles at the corner so the pedestals can be used as a vertical cable manager.

  Correct Answer: B

  According to the Raised Floor Installation Manual, the best practice for cutting holes in the raised floor tile is to draw a cross on the tile and when making a cut-out do not touch a line and avoid the corners. This ensures that the structural integrity and load-bearing capacity of the tile are not compromised. Cutting holes anywhere, touching the line, or cutting the corners can weaken the tile and cause it to crack or collapse. Additionally, the manual recommends using a drill press or a reciprocating saw with a metal or bi-metal cutting blade, and deburring all sharp edges.

• Question 2:

  Which type of Humidifier is composed of water-filled canister containing electrodes?

  A. Infrared Humidifiers

  B. Water Canister Humidifier

  C. Steam Canister Humidifier

  D. Ultrasonic Humidifier

  Correct Answer: C

  A steam canister humidifier is a type of humidifier that uses electricity to heat water in a canister containing electrodes. The water conductivity and the water level determine the amount of current and steam production. The steam canister humidifier is also known as an electrode boiler humidifier or an electrode steam humidifier123.

• Question 3:

  Measuring "Business Values" begins first with.

  A. Physical Infrastructure

  B. Topology

  C. Network

  D. Budget

  Correct Answer: D

  Measuring "Business Values" begins first with budgeting and identifying the costs associated with the project. This includes understanding the economic impact of the project, such as the cost of labor, materials, and other resources. It is also important to evaluate the return on investment (ROI) of the project, which will help to determine its overall value. Additionally, it is important to consider the long-term impact of the project and its potential to add value to the business in the future.

• Question 4:

  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.

  Correct Answer: B

  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 5:

  A fire extinguisher in the data centre is found which is classed as ABC. Is this suitable?

  A. Yes

  B. Depends on the brand

  C. Only for fires not related to electrical power

  D. No

  Correct Answer: D

  A fire extinguisher in the data centre that is classed as ABC is not suitable, because it contains dry chemical powder that can damage the ICT equipment and the data. ABC fire extinguishers are designed to fight Class A, B, and C fires, which are fueled by combustible materials, flammable liquids or gases, and electrical equipment, respectively. However, the dry chemical powder can leave a corrosive residue on the ICT equipment, which can cause short circuits, data loss, or malfunction. Moreover, the dry chemical powder can be difficult to clean, especially from the small spaces and crevices of the ICT equipment. Therefore, ABC fire extinguishers are not recommended for data centres, and should be replaced with more suitable fire extinguishers, such as clean agent fire extinguishers, which use gas or liquid that does not leave any residue or harm the ICT equipment.

• Question 6:

  What needs to be installed in the battery room when using Lithium-ion batteries?

  A. A battery management system to monitor and prevent unsafe temperatures during charging/discharging.

  B. High capacity air-conditioning equipment since Lithium-ion batteries are sensitive to high temperatures, which can reduce their lifetime.

  C. A proper ventilation system since Lithium-ion batteries produce highly flammable Hydrogen gas during charging.

  D. A proper supply of distilled water.

  Correct Answer: A

  According to the EPI Data Centre Training Framework, lithium-ion batteries are becoming more popular in data centres due to their higher energy density, longer lifespan, and lower maintenance costs compared to lead-acid batteries. However, lithium-ion batteries also have some drawbacks, such as higher initial cost, stricter safety requirements, and potential thermal runaway risks. Therefore, a battery management system (BMS) is essential to monitor and control the voltage, current, temperature, and state of charge of each battery cell or module, and to prevent overcharging, over-discharging, or overheating. A BMS can also communicate with the UPS system and provide information on the battery status, performance, and health.

• Question 7:

  By what are magnetic fields of the type 'H' or 'B' created?

  A. Magnetic fields are created when an electric current flows; the greater the current, the stronger the magnetic field.

  B. Magnetic fields are created by the magnetic flux of the earth which varies per month.

  C. Magnetic fields are created by voltage; the greater the voltage, the stronger the magnetic field.

  D. Magnetic fields are created when there is a high level of common mode noise (CMN); the greater the common mode noise (CMN), the stronger the magnetic field.

  Correct Answer: A

  According to the CDCP Preparation Guide1, magnetic fields of the type `H' or `B' are created when an electric current flows through a conductor, such as a wire or a coil. The magnetic field strength `H' is proportional to the current `I' and the number of turns `N' of the coil, and inversely proportional to the length `l' of the coil. The magnetic flux density `B' is proportional to the magnetic field strength `H' and the permeability `' of the medium in which the magnetic field exists. The greater the current, the stronger the magnetic field and the magnetic flux density. The relationship between `H', `B', `I', `N', `l', and `' can be expressed by the following equations:

  H = N I / l B =H

• Question 8:

  Escape route signage should be placed where?

  A. Only at emergency escape doors

  B. Only at the main entrance of the data centre building

  C. At every door providing a pathway

  D. At every door including riser doors, doors of storage closets etc.

  Correct Answer: C

  Escape route signage should be placed at every door providing a pathway to the exit or the assembly area, according to the CDCP Preparation Guide and the EU Safety/Health Signs Directive. Escape route signage is used to guide the occupants of the data centre fromwherever they are in the building, via a place of relative safety (the escape route), to the place of ultimate safety (the assembly area). Escape route signage should not be limited to only emergency escape doors or the main entrance of the data centre building, as these may not be accessible or visible from all locations. Escape route signage should also not include doors that do not lead to the exit or the assembly area, such as riser doors, doors of storage closets, or doors of other rooms, as these may confuse or mislead the occupants. Escape route signage should be placed at every door that provides a pathway to the exit or the assembly area, and should indicate the direction and distance of the escape route using pictograms, arrows, and words. Escape route signage should also be designed and installed in accordance with the relevant standards and codes, such as BS 5499 and ISO 7010.

• Question 9:

  Which one of the following does a Physical Infrastructure consists of in a Data Centre?

  A. Hub

  B. Switch

  C. Rack

  D. Server

  Correct Answer: C

  A physical infrastructure in a Data Center consists of racks, which are metal frames used to store and organize server and other IT equipment. The racks are usually arranged in rows and columns, and they can be used to hold servers, storage devices, and other pieces of IT equipment. The racks can also be used to organize cables and other components to ensure that the Data Center is kept organized and efficient.

• Question 10:

  What are the four main components of a refrigeration circuit?

  A. Evaporation, membrane filter, monitor sensor, pressure valve

  B. Evaporator, compressor, condenser, expansion valve

  C. Condenser, expansion valve, buffer tank, de-icing unit

  D. Thermostat, monitoring interface, indoor unit, outdoor unit

  Correct Answer: B

  The four main components of a refrigeration circuit are the evaporator, the compressor, the condenser, and the expansion valve, according to the CDCP Preparation Guide and various web sources. A refrigeration circuit is a system that transfers heat from a low-temperature region to a high-temperature region, using a working fluid called refrigerant. The refrigeration circuit operates in a closed loop, where the refrigerant changes its state from liquid to vapor and back to liquid, while absorbing and releasing heat. The four main components of the refrigeration circuit perform the following functions:

  1.

  The evaporator is a heat exchanger that absorbs heat from the low-temperature region, such as the data centre room, and transfers it to the refrigerant. The refrigerant enters the evaporator as a low-pressure, low-temperature liquid, and leaves the evaporator as a low-pressure, low-temperature vapor.

  2.

  The compressor is a mechanical device that increases the pressure and temperature of the refrigerant vapor. The refrigerant enters the compressor as a low-pressure, low-temperature vapor, and leaves the compressor as a high-pressure, high-temperature vapor.

  3.

  The condenser is another heat exchanger that releases heat from the refrigerant to the high-temperature region, such as the outside air or water. The refrigerant enters the condenser as a high-pressure, high-temperature vapor, and leaves the condenser as a high-pressure, low-temperature liquid.

  4.

  The expansion valve is a device that reduces the pressure and temperature of the refrigerant liquid. The refrigerant enters the expansion valve as a high-pressure, low-temperature liquid, and leaves the expansion valve as a low-pressure, low-temperature liquid. The expansion valve also controls the flow of the refrigerant into the evaporator, depending on the cooling load.