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質問 # 16
If a waveform period is determined to be 10 microseconds in duration, what is the frequency of the signal?
- A. 10 kHz
- B. 100 kHz
- C. 100 Hz
- D. 1000 Hz
正解：B
解説：
Explanation
Frequency is the inverse of period, so to calculate the frequency of a signal with a period of 10 microseconds, you would divide 1 by the period, which is equal to 100 kHz.
質問 # 17
___________ protects electrical equipment from damage caused by overload or short circuit.
- A. Circuit breaker
- B. IEC cable
- C. Volt switch
- D. Server
正解：A
解説：
Explanation
A circuit breaker is a device that protects electrical equipment from damage caused by overload or short circuit. It does this by automatically disconnecting the power supply when it detects a surge or drop in voltage, preventing the equipment from being damaged.
質問 # 18
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. wavelength
- B. amplitude
- C. frequency
- D. period
正解：A
解説：
Explanation
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 # 19
How many approaches are there to remove unwanted heat from an IT environment?
- A. Seven
- B. Six
- C. Five
- D. Four
正解：C
解説：
Explanation
There are five common approaches to removing unwanted heat from an IT environment:
* Air conditioning: using mechanical cooling to remove heat from the air.
* Air economization: using outside air to cool the IT environment when the temperature is cooler than the desired temperature inside the data center.
* Liquid cooling: using a liquid coolant to absorb and remove heat from IT equipment.
* Evaporative cooling: using water evaporation to cool the air.
* Immersion cooling: submerging IT equipment in a liquid coolant to remove heat.
質問 # 20
Which one of the following is an advantage of Glycol Cooled System?
- A. No maintenance of glycol
- B. Glycol pipes can run long distances and can service several CRAC units
- C. No additional cost is required
- D. Can be used in big data centers
正解：B
解説：
Explanation
Glycol cooled systems are advantageous because they are efficient and can service large data centers with multiple racks. Furthermore, glycol pipes can run long distances, allowing a single system to service several CRAC units. This eliminates the need for multiple systems, resulting in cost savings and reduced maintenance.
質問 # 21
For which one of these processes is Direct Current essential, and will not work with alternating current?
- A. Electrolysis
- B. Lighting
- C. Heating
- D. Turning a motor
正解：A
解説：
Explanation
Direct Current (DC) is essential for the process of electrolysis. Electrolysis is the process of breaking down a compound using an electric current. The electric current causes ions to move, which results in a chemical reaction that breaks down the compound. In order for electrolysis to work, a direct current is required, as the ions must flow in one direction. Alternating Current (AC) changes direction and would not provide a consistent flow of ions.
Heating, lighting, and turning a motor can be done by either DC or AC. Heating can be done by passing an electric current through a heating element, which can be powered by either DC or AC. Lighting can be done by passing an electric current through a light bulb, which can be powered by either DC or AC. A motor can be powered by either DC or AC, but the type of motor and the application will determine which type of current is more suitable.
質問 # 22
A __________ generator system is a combination of an electrical generator and a mechanical engine mounted together to form a single piece of equipment.
- A. active
- B. standby
- C. software
- D. passive
正解：B
解説：
Explanation
A Standby Generator System is a combination of an electrical generator and a mechanical engine mounted together to form a single piece of equipment. The generator provides power to essential appliances and equipment in the event of a power outage. Standby Generator Systems are usually powered by gasoline, diesel, natural gas, or propane, and they are designed to be able to be activated quickly in the event of an emergency.
質問 # 23
____________ is a systematic variation of the voltage wave form or a series of random voltage changes of small dimensions.
- A. Voltage fluctuation
- B. Frequency variation
- C. Voltage truncation
- D. Standby variation
正解：A
解説：
Explanation
Voltage fluctuation is a systematic variation of the voltage waveform or a series of random voltage changes of small dimensions that occur over a period of time. Voltage fluctuation can be caused by a variety of factors, such as changes in demand, changes in the power system, faults on the power system, or the switching of large loads.
質問 # 24
Which one of the following controls the voltage produced at the output of the alternator?
- A. Voltage Meter
- B. Voltage Stabilizer
- C. Voltage Regulator
- D. Voltage Backup Device
正解：C
解説：
Explanation
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 # 25
A typical data center load would consist of _____ (Choose 3)
- A. Power generator
- B. Computers
- C. Networking equipment
- D. Software
- E. Cooling equipment
正解：A、B、E
質問 # 26
Which one of the following is a disadvantage of Water Cooled System?
- A. Introduces an additional source of liquid
- B. All components are located inside the CRAC
- C. Usage of the building's condenser water is less expensive than chilled water
- D. Condenser water piping loops long distances
正解：A
解説：
Explanation
Water cooled systems introduce an additional source of liquid, which can be a potential source of contamination and damage to the IT equipment. Additionally, water cooled systems require more maintenance than air cooled systems and are more expensive to install due to the additional cost of the cooling tower, piping, and pumps.
質問 # 27
Which type of outlet is used for non-computing devices?
- A. Grounding
- B. Convenience
- C. Static
- D. Harmonic
正解：B
解説：
Explanation
Convenience outlets, also known as duplex receptacles or wall outlets, are used to provide power to non-computing devices, such as lamps, televisions, and other household appliances. They are typically found in residential and commercial buildings and are connected to a circuit breaker or fuse for protection against overloading and electrical fires
質問 # 28
Every air distribution system has a ____________ system and a _________ system
- A. Supply, Release
- B. Maintenance, Regulation
- C. Supply, Return
- D. Supply, Reverse
正解：C
解説：
Explanation
Every air distribution system has a supply system, which delivers conditioned air to the space, and a return system, which collects the air from the space and returns it to the air handling unit. The return system is responsible for providing the necessary negative pressure in the space to ensure proper air circulation.
質問 # 29
Which power distribution component is often used when many electrical devices are enclosed proximity especially with audio, video and computers?
- A. Backup server
- B. Power distribution units (PDU)
- C. Outlet strips
- D. Server plug
正解：B
解説：
Explanation
The best option for enclosing many electrical devices in proximity, especially with audio, video and computers, is Power Distribution Units (PDUs). PDUs are designed to provide power to multiple devices using a single power source, such as a wall outlet or a generator, while providing protection against power surges.
PDUs are generally equipped with multiple outlets to allow for a variety of electrical devices to be connected and powered simultaneously.
質問 # 30
Which one of the following is a Physical Security Identification Method?
- A. Batch ID
- B. Voice
- C. Sound
- D. Expression
正解：B
解説：
Explanation
Voice identification is a physical security identification method that uses the sound of an individual's voice to identify them. This method is often used in combination with other identification methods, such as biometric scans, to provide a more secure form of authentication. Voice identification is used in a variety of situations, such as when accessing a secure facility or when making financial transactions.
質問 # 31
Which one of the following measures the real power drawn by the load equipment?
- A. Watts
- B. Amps
- C. Amperes
- D. Volts
正解：A
解説：
Explanation
Watts measures the real power drawn by the load equipment and is determined by multiplying the volts and amps of the load
質問 # 32
___________ measures the amount of electrical current flowing through a circuit during a specific time interval.
- A. Ohm
- B. Watts
- C. Ampere
- D. Volts
正解：C
解説：
Explanation
An ampere (A) is the unit of measurement for electric current. It measures the amount of electrical current flowing through a circuit during a specific time interval. The ampere is named after Andre-Marie Ampere, a French mathematician and physicist who was one of the main discoverers of electromagnetism.
Ohm () is the unit of measurement for electric resistance, which is the opposition to the flow of an electric current through a circuit.
Volt (V) is the unit of measurement for electric potential difference, which is the energy required per unit charge to move a test charge between two places in a static electric field.
Watt (W) is the unit of measurement for power, which is the rate at which energy is used or generated in an electrical circuit.
References:
* "Current" (https://www.britannica.com/topic/current-electricity)
* "Electric current" (https://www.sciencedirect.com/topics/engineering/electric-current)
* "Units of Measurement"
(https://www.allaboutcircuits.com/textbook/direct-current/chpt-1/units-of-measurement/)
質問 # 33
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