EXIN EXIN-CDCP Online Practice Questions and Exam Preparation

EXIN EXIN-CDCP Online Questions & Answers

• Question 71:

  When having two non-synchronized power sources, the ATS / STS need to be of the type:

  A. Break before make.
  B. Make before break.
  C. Both make before break or break before make can be used.
  D. Both an ATS and STS can never handle two non-synchronized sources.
  A. Break before make.

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  Explanation

  When having two non-synchronized power sources, the ATS / STS need to be of the type break before make, which means that the switch disconnects from one source before connecting to the other source.

  This prevents any short circuit, back feed, or phase mismatch that could occur if the two sources were connected simultaneously. Break before make switches are also known as open transition switches, because they create a brief interruption in the power supply during the switching process. This interruption is usually acceptable for most ICT equipment, as they have internal power supplies or batteries that can handle the transient. However, if the interruption is not acceptable, then the two power sources need to be synchronized before switching, which requires a make before break switch, also known as a closed transition switch. Make before break switches connect to the second source before disconnecting from the first source, which ensures a seamless transfer of power without any interruption. However, make before break switches require that the two sources have the same voltage, frequency, and phase, which can be achieved by using a synchronization module or a phase-locked loop.

• Question 72:

  Which Class of Fires involves cooking appliances?

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

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  Explanation

  According to the EPI Data Centre Professional (CDCP? Preparation Guide, Class K fires involve cooking appliances that use combustible cooking media such as vegetable or animal oils and fats (page 28). Class K fires require special extinguishing agents that can suppress the high-temperature flames and prevent re-ignition. Class K fires are different from Class B fires, which involve flammable liquids such as gasoline, oil, or paint.

• Question 73:

  IP protection grades consist of two numbers.

  Which levels of protection do they describe and what is the best protection?

  A. First digit; protections against the ingress of solid objects. Second digit; protection against ingress of water/fluids. The lower the number the better the level of protection.
  B. First digit; protections against the ingress of solid objects. Second digit; protection against ingress of water/fluids. The higher the number the better the level of protection.
  C. First digit; protections against the ingress of water/fluids. Second digit; protection against ingress of solid objects. The higher the number the better the level of protection.
  D. First digit; protections against the ingress of water/fluids. Second digit; protection against ingress of solid objects. The lower the number the better the level of protection.
  B. First digit; protections against the ingress of solid objects. Second digit; protection against ingress of water/fluids. The higher the number the better the level of protection.

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  Explanation

  IP protection grades are a way of showing the effectiveness of electrical enclosures in blocking foreign bodies such as dust, moisture, liquids, and accidental contact. IP stands for Ingress Protection or International Protection, and it is defined by the international standard IEC 60529. IP ratings consist of the letters IP followed by two digits and an optional letter. The first digit indicates the level of protection the enclosure provides against access to hazardous parts and the ingress of solid foreign objects. The second digit indicates the level of protection the enclosure provides against the ingress of water or fluids. The higher the number, the better the level of protection. For example, IP65 means the enclosure is dust-tight and can withstand water jets from any direction. IP68 means the enclosure is dust-tight and can be submerged in water under specified conditions.

  References:

  EPI Data Centre Training Framework, CDCP Preparation Guide, IP code - Wikipedia, [IP Ratings Explained | Ingress Protection Rating | IP Codes | Updated 2022]

• Question 74:

  Which facility practice most directly supports controlled physical access?

  A. Give every employee access to all technical rooms
  B. Use access zones based on job responsibilities
  C. Keep technical rooms unlocked during staffed hours
  D. Share one access credential among each work team
  B. Use access zones based on job responsibilities

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  Explanation

  Role-based access zones limit entry to people who need it for assigned duties and make accountability clearer. Shared credentials and unrestricted access weaken both control and traceability.

• Question 75:

  What is the main difference between an Environmental Monitoring System (EMS) and a Building Management System (BMS)?

  A. An EMS provides local alarms. A BMS provides both local and remote alarms.
  B. A BMS is only able to monitor dry contacts (on/off). An EMS can also monitor analog values.
  C. A BMS only operates as a stand-alone system. An EMS can be configured as a redundant system.
  D. An EMS monitors only. A BMS monitors and controls.
  D. An EMS monitors only. A BMS monitors and controls.

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  Explanation

  The main difference between an Environmental Monitoring System (EMS) and a Building Management System (BMS) is that an EMS monitors only, while a BMS monitors and controls. An EMS is a system that collects and records data from various sensors and devices that measure environmental parameters, such as temperature, humidity, air quality, power, and water. An EMS provides alerts and reports based on the data, but it does not control or adjust the environmental conditions. A BMS is a system that integrates and manages various building systems, such as HVAC, lighting, security, fire, and access. A BMS not only monitors the data from these systems, but also controls and optimizes them to achieve the desired performance and efficiency. A BMS can also communicate with an EMS to receive data and provide feedback.

• Question 76:

  What is a requirement for both CCTV cameras and recording equipment?

  A. They must be of the same brand.
  B. Both must be placed inside the Computer room.
  C. Both must be connected to a UPS.
  D. CCTV cameras can only be used to cover the outside of the building, where as the recording equipment needs to be located in a secure area.
  C. Both must be connected to a UPS.

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  Explanation

  A UPS (Uninterruptible Power Supply) is a device that provides backup power to electrical equipment in case of a power outage or fluctuation. A UPS is essential for both CCTV cameras and recording equipment, as it ensures that the surveillance system can continue to operate and record without interruption or data loss. A UPS can also protect the CCTV cameras and recording equipment from damage caused by power surges or spikes. Connecting both CCTV cameras and recording equipment to a UPS is a requirement for data centres, as it enhances the security and reliability of the surveillance system.

  References:

  Technical Specification - GeM, [What is a UPS? | Uninterruptible Power Supply | APC by Schneider Electric], [Why You Need a UPS for Your CCTV System - CCTV Camera World].

• Question 77:

  Which one of the following is an Audible Signaling and Notification Device?

  A. Sirens
  B. Strobes
  C. Alarms
  D. Clocks
  A. Sirens

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  Explanation

  According to the CDCP?Preparation Guide, an audible signaling and notification device is a device that produces a sound to alert or notify the occupants of a data center of an event or condition. Sirens are examples of such devices, as they can emit loud and distinctive tones to warn of fire, emergency, or security incidents. Strobes, on the other hand, are visual signaling and notification devices that produce flashes of light to attract attention or convey information. Alarms and clocks are not specific types of devices, but rather general terms that can refer to various audible or visual devices.

  References:

  CDCP?Preparation Guide, page 30. Audible Visual Notification | System Sensor | Honeywell.

  Audible-Visual Signaling Devices - AutomationDirect.

• Question 78:

  Which type of Humidifier rapidly vibrates waster to create a fog or mist?

  A. Infrared Humidifier
  B. Water Canister Humidifier
  C. Steam Canister Humidifier
  D. Ultrasonic Humidifier
  D. Ultrasonic Humidifier

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  Explanation

  An ultrasonic humidifier is a type of cool mist humidifier that uses a metallic diaphragm that vibrates at high frequencies to create water droplets that are added to the air. A fan projects these droplets into the air as mist, which then evaporates and humidifies the room. This type of humidifier rapidly vibrates the water to create a fog or mist.

• Question 79:

  Before adding a large new equipment load, which facility check is most important?

  A. Confirm that supporting power and cooling capacity can accommodate the load
  B. Confirm that the cabinet color matches existing equipment
  C. Confirm that the equipment vendor uses the same shipping company
  D. Confirm that the installation occurs at the end of the month
  A. Confirm that supporting power and cooling capacity can accommodate the load

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  Explanation

  New equipment affects the supporting facility systems, so available power and cooling capacity must be evaluated before installation. Cosmetic and scheduling details do not establish whether the facility can support the load.

• Question 80:

  What is the current recommended temperature for ICT equipment as described in the ASHREA TC 9.9 guideline?

  A. 8-18 C (46.4 -64.4 degF)
  B. 20-40 degC (68 - 104 degF)
  C. 18-27 C (64.4 - 80.6 degF)
  D. 25-45 degC (77 - 113 degF)
  C. 18-27 C (64.4 - 80.6 degF)

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  Explanation

  The current recommended temperature for ICT equipment as described in the ASHRAE TC 9.9 guideline is 18-27 C (64.4 - 80.6). This is the recommended range for the dry-bulb temperature at the inlet of the servers, which is the most critical parameter for ensuring the optimal performance and reliability of the ICT equipment. The recommended range is based on the thermal specifications of the majority of the ICT equipment in the market, as well as the energy efficiency and environmental considerations of the data centre cooling systems. The recommended range is suitable for Classes A1 to A4 of the ASHRAE thermal guideline classes, which cover different types and generations of ICT equipment.