EXIN EXIN Certifications CDCP Questions & Answers

• Question 21:

  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.

  Correct Answer: D

  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 22:

  What is a requirement of an FM200 (HFC-227) installation?

  A. It is a high-pressure gas; therefore nozzles must be mounted with two brackets.

  B. Drainage system under the raised floor.

  C. Install the gas containers (tanks) close to the data centre.

  D. Install pre-action sprinklers in the same room as the FM200.

  Correct Answer: A

  FM200 (HFC-227) is a clean agent fire suppression system that uses a high-pressure gas to extinguish fires by reducing the oxygen concentration and absorbing the heat. FM200 is stored in cylinders at pressures of up to 42 bar (600 psi) and is released through nozzles into the protected area. Because of the high pressure, the nozzles must be mounted with two brackets to prevent them from moving or breaking during discharge. The brackets must be securely attached to the ceiling or wall and aligned with the nozzle outlet. The nozzle outlet must also be free of any obstructions that could affect the discharge pattern or distribution.

• Question 23:

  Where should exit/emergency signs be located?

  A. Depends on the policy of the data centre

  B. At every escape door and pathways leading to doors (arrows)

  C. In the Computer room only

  D. At each door

  Correct Answer: B

  According to the EPI Data Centre Operations Standard (DCOS), exit/emergency signs should be located at every escape door and pathways leading to doors (arrows) to ensure a safe and quick evacuation in case of an emergency. This is also consistent with the best practices for data centre emergency preparedness and response, which recommend having a clear and visible signage system for emergency exits.

• Question 24:

  Which one of the following is a Natural Disaster?

  A. Grid Failure

  B. Blackouts

  C. Hurricanes

  D. Human Error

  Correct Answer: C

  According to the CDCP?Preparation Guide, a natural disaster is a catastrophic event that is caused by natural forces and has a significant impact on human lives, property, and environment. Hurricanes are examples of natural disasters, as they are powerful storms that form over warm ocean waters and produce strong winds, heavy rain, storm surges, and flooding. Grid failure, blackouts, and human error are not natural disasters, but rather man-made or technological disasters that result from failures or errors in human systems or activities.

• Question 25:

  From the list below, which sensor detects smoke the fastest?

  A. Photoelectric detector

  B. VESDA/HSSD

  C. lonization detector

  D. Sprinkler bulbs

  Correct Answer: B

  VESDA (Very Early Smoke Detection Apparatus) or HSSD (High Sensitivity Smoke Detection) systems are the fastest smoke sensors among the options listed. These systems use a network of pipes to draw air samples from the protected area and analyze them using a laser-based detection chamber. VESDA/HSSD systems can detect smoke at very low concentrations, typically in the range of 0.005 to 20 percent obscuration per meter. This means they can provide early warning of a fire before it becomes visible or spreads. VESDA/HSSD systems are ideal for data centers and other critical facilities that require high levels of fire protection and minimal downtime.

• Question 26:

  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

  Correct Answer: D

  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 27:

  When dealing with glass door racks, cool air is injected into the rack from:

  A. The rear door in a downflow direction.

  B. The front door in a downflow direction.

  C. The top of the rack through the fans and vents mounted inside the rack.

  D. The bottom of the rack.

  Correct Answer: A

  Glass door racks are a type of rack that have solid glass front doors and rear door heat exchangers (RDHx). RDHx are devices that use facility coolant to absorb heat from the exhaust air of the IT equipment and return cool air to the room. RDHx can be either passive or active, depending on the fan configuration. In general, IT hardware within the rack is air-cooled and the door heat exchanger uses facility coolant to absorb heat from exhaust air to return air to the facility at or near inlet air temperature to the rack. This rear door heat exchanger can either be a passive or active solution. When dealing with glass door racks, cool air is injected into the rack from the rear door in a downflow direction. This means that the cool air flows from the top to the bottom of the rack, following the natural convection of the hot air rising. This way, the cool air can reach all the IT equipment in the rack and prevent hot spots or overheating.

• Question 28:

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

  A. Legal fees

  B. Damaged brand perception

  C. Negative public relations

  D. Reduced customer satisfaction

  Correct Answer: A

  Legal fees are an example of direct cost because they can be directly attributed to a specific project, product, or service. Legal fees are incurred for the purpose of obtaining legal advice, drafting contracts, resolving disputes, or complying with regulations related to the core business activity. Legal fees are not general overhead expenses that are shared by multiple cost objects.

• Question 29:

  Which source is used in fiber cable to transmit data?

  A. Signals

  B. Electric

  C. Light

  D. Pulse

  Correct Answer: C

  Fiber-optic cables use light as the source to transmit data. Light pulses are modulated to carry information through an optical fiber. The light is confined in the core of the fiber by total internal reflection at the core-cladding interface. The light travels along the fiber with minimal loss or interference, making it suitable for long-distance and high-bandwidth applications.

• Question 30:

  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

  Correct Answer: C

  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 sources234. 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.