Question 1

True or False: A grounded wire is connected to metal appliance cases

Accepted Answer

A

Explanation: The ground wire, formally known as the equipment grounding conductor (EGC) or protective earth (PE), is a critical safety feature. It is intentionally connected to the non-current-carrying conductive parts of an appliance, such as its metal case or chassis. In the event of an internal insulation failure where a "hot" (live) wire touches the metal case, the ground wire provides a low-impedance path for the fault current to flow back to the source. This large current flow will trip the circuit breaker or blow the fuse, de-energizing the circuit and preventing the metal case from becoming dangerously electrified, thus protecting users from electric shock.

Question 2

Which one of the following describes the amount of resistance electricity encounters?

Accepted Answer

A

Explanation: The Ohm (symbol: Ω) is the standard international (SI) unit of electrical resistance. Resistance is the measure of the opposition to the flow of electric current in a circuit. According to Ohm's Law, one ohm is the resistance between two points of a conductor when a constant potential difference of one volt, applied to these points, produces a current of one ampere. Therefore, "Ohm" is the term that describes the amount of resistance electricity encounters.

Question 3

Which one of the following is a disadvantage of Water Cooled System?

Accepted Answer

D

Explanation: The most significant disadvantage of any water-cooled system within a data center is the inherent risk associated with bringing a liquid into close proximity with sensitive electronic equipment. A leak from pipes, valves, or cooling unit coils can lead to catastrophic equipment failure, data loss, and extended downtime. This risk requires the implementation of costly mitigation measures, such as robust leak detection systems, drip pans, and specialized piping, making it a primary concern for data center designers and operators.

Question 4

Which component is designed to protect electrical equipment from damage caused by overload or short circuit?

Accepted Answer

D

Explanation: A circuit breaker is an automatic electrical switch designed to protect an electrical circuit from damage caused by an overcurrent, which can result from either an overload or a short circuit. Its primary function is to detect a fault condition and immediately interrupt the current flow. Unlike a fuse, which operates once and must be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation after the fault has been cleared. This makes it a fundamental protective component in electrical distribution systems.

Question 5

Which one of the following is a Physical Security Device?

Accepted Answer

B

Explanation: A physical security device is a tangible object used to control, monitor, or grant access to a physical location or asset. A contactless smart card is a physical credential that contains an embedded integrated circuit. It is used with a physical card reader to electronically authenticate an individual and grant them access to a secured area, such as a data center building or server room. Its primary function is to enforce physical access control policies, making it a direct example of a physical security device.

Question 6

Which mounted system is used to cool small IT environments?

Accepted Answer

C

Explanation: Ceiling-mounted cooling systems are specifically designed for small IT environments such as server closets, network rooms, or edge computing sites. Their primary advantage is a zero-footprint design, which preserves valuable floor space for IT equipment. These self-contained units are installed in the ceiling plenum or suspended from the ceiling, providing efficient and targeted air conditioning directly to the small space without the need for the extensive infrastructure required by larger systems.

Question 7

Which one of the following is an advantage of Glycol Cooled System?

Accepted Answer

C

Explanation: A primary advantage of a glycol-cooled system is its architectural flexibility and scalability. In this design, a central chiller plant cools a water/glycol mixture, which is then pumped through a closed-loop piping network to multiple Computer Room Air Conditioning (CRAC) or Air Handling (CRAH) units. This fluid can be transported efficiently over much longer distances than the refrigerant in a direct expansion (DX) system. This capability allows a single, centralized cooling plant to serve numerous cooling units spread across a large data center floor, making it an ideal solution for medium to large-scale facilities where heat rejection equipment must be located far from the IT space.

Question 8

Which one of the following uses sensors such as laser beams or touch sensor?

Accepted Answer

C

Explanation: Alarm systems, as a core component of a physical Intrusion Detection System (IDS), are designed to detect unauthorized presence or actions. They achieve this by using a variety of sensors. Laser beams (more formally, photoelectric beam sensors) are frequently used to establish an invisible perimeter; an alarm is triggered when the beam is interrupted. Similarly, touch or pressure-sensitive sensors can be deployed on specific assets like windows, doors, or safes to detect physical contact or attempts to breach them. The primary function of these sensors is to provide an input signal to the alarm control panel.

Question 9

Which system in Air Distribution System takes the hot exhaust air from the IT equipment to the CRAC

Accepted Answer

A

Explanation: The air distribution system in a data center is fundamentally composed of a supply side and a return side. The supply system delivers conditioned, cool air from the Computer Room Air Conditioner (CRAC) to the IT equipment inlets. After this air passes through the equipment and absorbs heat, it becomes hot exhaust air. The return system is the designated pathway responsible for capturing this hot exhaust air and directing it back to the CRAC unit to be cooled again. This completes the air-cooling cycle, ensuring efficient thermal management.

Question 10

__________ represents the maximum power cable of being drawn by the equipment.

Accepted Answer

B

Explanation: The power rating of a piece of electrical equipment, typically specified by the manufacturer in Watts (W), represents the maximum amount of real power the device is designed to draw under normal operating conditions. This value is critical in data center environments for calculating the thermal load (heat output) that cooling systems must handle, as well as for overall power capacity planning and energy cost estimation. It signifies the actual rate at which the equipment consumes energy to perform its function.

Free GAQM CDCS-001 Actual Exam Questions