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質問 # 31
The distance that a signal's energy can travel in the time it takes for one cycle to occur is called the signal's:
- A. frequency
- B. period
- C. wavelength
- D. amplitude
正解：C
解説：
Wavelength is a measure of the distance that a signal's energy can travel in the time it takes for one cycle of the signal to occur. It is calculated by dividing the speed of light by the frequency of the signal. Wavelength is generally expressed in meters (m).
質問 # 32
Which of the following is an example of a physical security identification method?
- A. Expression
- B. Sound
- C. Batch ID
- D. Voice
正解：A
質問 # 33
Which of the following voltage configurations is suitable for commercial environments and data centers?
- A. Single phase 120V
- B. 3-phase 280V
- C. Single phase 240V
- D. Single phase 120V and 240V (Selected)
正解：D
質問 # 34
What is a Data Center?
- A. A room in a building dedicated to monitoring data and information.
- B. A building or a portion of a building whose primary function is to house a computer room and its related support areas
- C. A building or a portion of a building where debugging takes place
- D. A building or portion of a building whose primary function is to research new data.
正解：B
解説：
Explanation
A building or a portion of a building whose primary function is to house a computer room and its related support areas. A Data Center is a secure, temperature-controlled environment that houses computer systems, equipment, and associated components. It is typically used to store, process, and distribute large amounts of data and information. Data Centers typically include server racks, storage arrays, network switches, firewalls, and other components necessary for the operation of computer systems.
質問 # 35
A typical data center load would consist of _____ (Choose 3)
- A. Power generator
- B. Software
- C. Cooling equipment
- D. Networking equipment
- E. Computers
正解：A、C、E
質問 # 36
___________ security refers to preventing unauthorized or malicious individuals from accessing areas where they do not belong
- A. Logical
- B. Network
- C. Topological
- D. Physical
正解：D
質問 # 37
Which one of the following controls the voltage produced at the output of the alternator?
- A. Voltage Backup Device
- B. Voltage Stabilizer
- C. Voltage Regulator
- D. Voltage Meter
正解：C
解説：
A voltage regulator controls the voltage produced at the output of the alternator. It's a device that maintains the output voltage of an alternating current (AC) power source within a safe range. The voltage regulator compares the actual output voltage to the desired voltage level and adjusts the voltage accordingly.
Voltage Meter, Voltage Stabilizer, and Voltage Backup Device are not devices that control the voltage produced at the output of the alternator. They are different types of equipment and have different functions.
A voltage meter is a device used to measure the voltage in an electrical circuit. A voltage stabilizer is an electronic device that maintains a constant voltage level. A voltage backup device is a device that provides temporary backup power in case of an electrical outage.
質問 # 38
Given a waveform period of 10 microseconds, calculate the signal frequency.
Options:
- A. 1000 Hz
- B. 100 kHz
- C. 10 kHz
- D. 100 Hz
正解：B
質問 # 39
__________ represents the maximum power cable of being drawn by the equipment.
- A. VA rating
- B. Power rating
- C. Star rating
- D. Grade rating
正解：B
解説：
Explanation
Power rating represents the maximum power that can be drawn by the equipment. It is usually measured in watts (W) or kilowatts (kW) and represents the maximum amount of power that the equipment can consume without causing damage to the device or the power source.
VA rating (Volt-Ampere rating) is a measure of the apparent power in a circuit, which is the product of the voltage and current in the circuit. It is often used to describe the power handling capability of electronic devices and equipment.
Star rating is a rating system used to indicate the energy efficiency of electrical devices and equipment. The rating ranges from 1 to 5 stars, with 5 stars indicating the most energy-efficient device.
Grade rating is a rating system used to indicate the quality of electrical devices and equipment. It is used in different industry and can indicate the quality of electronic component and material used in equipment.
質問 # 40
Which mounted system can use any of the five heat removal methodologies?
- A. Floor Mounted System
- B. Chilled Mounted System
- C. Air Mounted System
- D. Ceiling Mounted System
正解：D
質問 # 41
Which of the following is an example of a physical security device?
- A. Access Key
- B. Token card
- C. Contactless smart card (Selected)
- D. Fiber optic cable
正解：C
質問 # 42
Which one of the following Volt Configurations support commercial environments and data centers?
- A. Single phase 120V
- B. 3-phase 280V
- C. Single phase 120V and 240V
- D. Single phase 240V
正解：B
質問 # 43
Which three of the following typically make up a data center load?
- A. Software
- B. Networking equipment (Selected)
- C. Cooling equipment (Selected)
- D. Power generator
- E. Computers
正解：B、C、E
質問 # 44
Which one of the following is a Physical Security Device?
- A. Access Key
- B. Token card
- C. Fiber optic cable
- D. Contactless smart card
正解：D
解説：
Explanation
A contactless smart card is a physical security device that uses radio frequency identification (RFID) technology to identify and authenticate an individual. This type of card is used in a variety of applications, such as access control systems and digital payment systems. It is also used in physical access control systems, where the card is used to unlock doors or grant access to restricted areas. Contactless smart cards are also used in building access systems, where the card is used to grant access to certain areas of the building.
質問 # 45
In an air distribution system, which subsystem carries the hot exhaust air from IT equipment to the CRAC unit?
- A. Supply system
- B. Maintenance system
- C. Return system (Selected)
- D. Regulation system
正解：C
質問 # 46
AC is more easily distributed than DC. This is because:
- A. Wires have less resistance if they are carrying AC
- B. AC can be transformed from a low voltage to a high voltage and back again with a transformer. DC cannot.
- C. AC can be transmitted using lighter wires.
- D. DC needs wires to be totally insulated, while AC wires can be bare, hung from insulator on pylons.
正解：B
解説：
AC can be transformed from a low voltage to a high voltage and back again with a transformer, while DC cannot. This makes it easier to distribute AC electricity over long distances and is why it is used more widely than DC electricity. A and B are also true, as wires carrying AC can be bare and don't need to be totally insulated. Wires have less resistance when carrying AC electricity, which is why it is more efficient than DC.
質問 # 47
Which one of the following is an advantage of Air Cooled Self-Contained System?
- A. Lowest installation cost
- B. It has more heat removal capacity per unit
- C. It doesn't requires ductwork and/or dropped ceiling
- D. All components contain more than one unit
正解：C
解説：
Air cooled self-contained systems are highly efficient and do not require ductwork and/or dropped ceiling for installation. This makes them a great choice for locations where installation costs are a major factor, such as in residential applications, or in places with limited space. Additionally, air cooled self-contained systems have more heat removal capacity per unit compared to water cooled systems, making them more cost- effective in the long run.
質問 # 48
True or False: The availability of fuel typically determines the type of standby generator chosen.
- A. True
- B. False
正解：A
質問 # 49
True or False: A grounded wire is connected to metal appliance cases
- A. True
- B. False
正解：A
解説：
Explanation
A grounded wire is connected to metal appliance cases in order to provide a safe path for electricity to flow in the event of a short circuit or other electrical problem. This helps to protect the appliance and the people using it from potential electrical shocks, and it also helps prevent fires and other accidents.
質問 # 50
Which system in Air Distribution System takes the hot exhaust air from the IT equipment to the CRAC
- A. Supply system
- B. Maintenance system
- C. Return system
- D. Regulation system
正解：C
解説：
The return system in an air distribution system takes the hot exhaust air from the IT equipment and returns it to the Computer Room Air Conditioner (CRAC) unit. The CRAC unit cools the hot exhaust air and recirculates it back into the data center. The return system typically includes ducts, grills, and other components that allow the hot air to be efficiently and effectively returned to the CRAC unit.
Supply system is responsible for bringing in the cooled and filtered air from the CRAC unit to the data center.
Maintenance system and regulation system are not related to air distribution system in the data center.
質問 # 51
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