Brunei Darussalam: What Do You Know About Amateur Radio? Quiz

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  • 1/49 Questions

    Station and Log book as well as a licence are required for random inspection done by

    • A certified Radio Organisation
    • Authority For Info-communications Technology Industry (AiTi)
    • Royal Brunei Police Force
    • Registration of Organisations
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About This Quiz

Explore the intricacies of amateur radio in Brunei Darussalam, covering ITU regions, call signs, customs regulations, logbook requirements, and equipment usage. Perfect for enthusiasts looking to understand regulatory compliance and operational protocols.

Brunei Darussalam: What Do You Know About Amateur Radio? Quiz - Quiz

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  • 2. 

    What is the 'Callsign' given to Brunei Darussalam by the 'International Telecommunication Union'?

    • V5

    • V8

    • VA

    • VM

    Correct Answer
    A. V8
    Explanation
    The correct answer is V8. The International Telecommunication Union assigns callsigns to countries for their telecommunications purposes. Brunei Darussalam has been assigned the callsign V8.

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  • 3. 

    With regards to AiTi rules and regulation, amateur radio equipment is only permitted to be operated

    • Within the frequency range stated in the license

    • Within the permitted range of frequency in the radio equipment

    • Using a radio transceiver

    • One time only

    Correct Answer
    A. Within the frequency range stated in the license
    Explanation
    According to AiTi rules and regulations, amateur radio equipment can only be operated within the frequency range stated in the license. This means that individuals who hold a license for amateur radio operation are only allowed to use their equipment within the specific frequency range that has been authorized by AiTi. Operating outside of this range would be a violation of the rules and regulations.

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  • 4. 

    What is simplex operation?

    • Transmitting and receiving on the same frequency

    • Transmitting and receiving over a wide area

    • Transmitting one frequency and receiving on another

    • Transmitting one-way frequency

    Correct Answer
    A. Transmitting and receiving on the same frequency
    Explanation
    Simplex operation refers to the process of transmitting and receiving on the same frequency. In this mode, communication can only occur in one direction at a time. This means that while one party is transmitting, the other party can only receive and vice versa. Simplex operation is commonly used in situations where simultaneous two-way communication is not required or feasible, such as in radio broadcasting or walkie-talkie communication.

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  • 5. 

    In what Region and Zone is Brunei Darussalam located?

    • Region 3, Zone 28

    • Region 1, Zone 25

    • Region 3, Zone 25

    • Region 2, Zone 28

    Correct Answer
    A. Region 3, Zone 28
    Explanation
    http://www4.plala.or.jp/nomrax/CQ/zone28.htm

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  • 6. 

    All operations regarding station usage need to be recorded in a log book. What details are required to be included in the log book for amateur radio operators every time they are on air?

    • Date, station callsign which with you are communicating with, frequency band and emission

    • Date, frequency band and emission, station call sign which with you are communicating. start and end of conversation time. signal report, QSL

    • Date, frequency band and emission, power output, conversation time, signal report, statement

    • Date, station which with you are communicating with, frequency band, emission and power output

    Correct Answer
    A. Date, frequency band and emission, station call sign which with you are communicating. start and end of conversation time. signal report, QSL
    Explanation
    The log book for amateur radio operators needs to include the date, frequency band, and emission. It also needs to include the station call sign that they are communicating with, as well as the start and end times of the conversation. Additionally, the log book should include a signal report and QSL confirmation.

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  • 7. 

    What is the meaning of the term "73"?

    • Long distance

    • Best regards

    • 73%

    • Good morning

    Correct Answer
    A. Best regards
    Explanation
    The term "73" is a commonly used phrase in amateur radio communication, which is used to express "Best regards". It is a form of greeting or farewell among radio operators. This phrase is derived from the "92 Code" used in telegraphy, where "73" represented "Best regards". Over time, it has become a shorthand way for radio operators to convey their well wishes and friendly sentiments to each other.

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  • 8. 

    What is the minimum validity period of an Amateur Radio Station License?

    • 3 months

    • 1 year

    • 20 years

    • 5 years

    Correct Answer
    A. 1 year
    Explanation
    The minimum validity period of an Amateur Radio Station License is 1 year. This means that once an individual obtains the license, it will remain valid for a minimum of 1 year before it needs to be renewed.

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  • 9. 

    What is the basic unit of electric power?

    • The ohm

    • The watt

    • The volt

    • The ampere

    Correct Answer
    A. The watt
    Explanation
    The watt is the basic unit of electric power. It measures the rate at which electrical energy is transferred or consumed. One watt is equal to one joule of energy per second. It is named after James Watt, a Scottish inventor and mechanical engineer who made significant contributions to the development of the steam engine. The watt is commonly used to measure the power consumption of electrical devices and is an essential unit in understanding and calculating electrical energy usage.

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  • 10. 

    In the diagram, indicate the current flow in the semi-conductor diode.

    • From B to A

    • From A to B

    • From A to B and B to A

    • None of the above

    Correct Answer
    A. From A to B
    Explanation
    The correct answer is "From A to B". In a semiconductor diode, current flows in the direction of the arrow symbol, which in this case is from A to B. This is because the diode is designed to allow current to flow easily in one direction (forward bias), while blocking it in the opposite direction (reverse bias). Therefore, the current flows from the anode (A) to the cathode (B) in a semiconductor diode.

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  • 11. 

    What does RST mean in a signal report?

    • Recovery, signal strength, tempo

    • Recovery, signal speed, tone

    • Readability, signal speed, tempo

    • Readability. signal strength, tone

    Correct Answer
    A. Readability. signal strength, tone
    Explanation
    RST stands for Readability, Signal Strength, and Tone in a signal report. Readability refers to how easily the signal can be understood, signal strength indicates the power or intensity of the signal, and tone refers to the quality or characteristics of the signal. These three factors are commonly used to assess and report the quality of a signal in communication.

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  • 12. 

    When using a repeater to communicate, which of the following do you need to know about the repeater?

    • Its input frequency and offset

    • Its callsign

    • Its power level

    • Whether or not it has amo patch

    Correct Answer
    A. Its input frequency and offset
    Explanation
    When using a repeater to communicate, it is important to know its input frequency and offset. The input frequency refers to the frequency at which the repeater receives signals from users, while the offset indicates the difference between the input and output frequencies. This information is crucial in order to properly configure radios and ensure effective communication through the repeater. The other options, such as the repeater's callsign, power level, and whether or not it has an amo patch, are not directly related to the operation and configuration of the repeater.

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  • 13. 

    What formula shows how voltage current and resistance relate to each other in an electric circuit?

    • Ohm's Law

    • Kirchhoff's Law

    • Ampere's Law

    • Tesla's Law

    Correct Answer
    A. Ohm's Law
    Explanation
    Ohm's Law is the formula that shows how voltage, current, and resistance relate to each other in an electric circuit. It states that the current flowing through a conductor is directly proportional to the voltage applied across it and inversely proportional to the resistance of the conductor. This relationship is expressed by the equation I = V/R, where I is the current, V is the voltage, and R is the resistance.

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  • 14. 

    If you purchase amateur radio equipment from outside the country, what is the right thing t do upon arrival at the custom's control post?

    • Bringing in the said equipment without notifying Royal Brunei Custom and Excise officials

    • Surrendering the equipment to the Royal. Brunei Custom and Excise officials

    • Paying import tax for the equipment

    • Bringing the equipment directly to AiTi officials

    Correct Answer
    A. Surrendering the equipment to the Royal. Brunei Custom and Excise officials
    Explanation
    Upon arrival at the customs control post, the right thing to do is to surrender the equipment to the Royal Brunei Custom and Excise officials. This implies that it is necessary to declare the equipment and follow the appropriate procedures for importing amateur radio equipment from outside the country.

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  • 15. 

    In what circumstances can an amateur radio broadcast information to the public?

    • When an amateur radio operator is paid

    • When broadcasting is less than one hour

    • When broadcasting is more than 15 minutes

    • It is entirely prohibited

    Correct Answer
    A. It is entirely prohibited
    Explanation
    Amateur radio operators are not allowed to broadcast information to the public. They are only permitted to communicate with other licensed amateur radio operators for personal and non-commercial purposes. Broadcasting information to the public would require a commercial broadcasting license, which is not available to amateur radio operators. Therefore, it is entirely prohibited for them to broadcast information to the public.

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  • 16. 

    Which of the following uses the International Phonetic Alphabet?

    • Alpha, Norway, Delta

    • Charlie, Alpha, Tosca

    • Denmark, Oscar, Gordon

    • Bravo, Uniform, Golf

    Correct Answer
    A. Bravo, Uniform, Golf
    Explanation
    The International Phonetic Alphabet (IPA) is a system of phonetic notation that is used to represent the sounds of human speech. It is widely used by linguists, language learners, and speech pathologists. The correct answer, "Bravo, Uniform, Golf," consists of words that are spelled using the phonetic symbols of the IPA. Therefore, this option is the one that uses the International Phonetic Alphabet.

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  • 17. 

    What is meant by the term "DX"?

    • Best regards

    • Distant station

    • Calling any station

    • Go ahead

    Correct Answer
    A. Distant station
    Explanation
    The term "DX" is commonly used in radio communication to refer to a distant station. It is often used by amateur radio operators to indicate that they have successfully made contact with a station that is located far away. "DX" is derived from the telegraphic term "Distant station" and is used to signify long-distance communication.

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  • 18. 

    A station 'Callsign' is sent for the purpose of identification at the start of transmission and end of transmission. It should be repeated for

    • Within the first 30 minutes

    • Every 15 minutes

    • Once after the first 15 minutes

    • Once within 30 minutes

    Correct Answer
    A. Every 15 minutes
    Explanation
    The station 'Callsign' is sent for identification purposes at the start and end of transmission. To ensure that the identification is consistent and up-to-date, it should be repeated every 15 minutes. This frequency allows other stations to easily identify and track the transmitting station throughout the communication session.

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  • 19. 

    All amateur radio equipment in a station has to be maintained and used

    • Not to interfere with other radio-communication services

    • With support from IEE

    • Approximately 20% of the approved maximum power

    • With complete discretion by AiTi officials

    Correct Answer
    A. Not to interfere with other radio-communication services
    Explanation
    The correct answer is "Not to interfere with other radio-communication services." This means that all amateur radio equipment in a station must be maintained and used in a way that does not cause any interference with other radio-communication services. This is important to ensure that all radio users can operate without any disruptions or conflicts.

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  • 20. 

    Which antenna is the best option to be installed for a portable HF station in case of emergency?

    • Dipole

    • Three element Quad

    • Three element Yagi

    • Satellite Dish

    Correct Answer
    A. Dipole
    Explanation
    A dipole antenna is the best option to be installed for a portable HF station in case of an emergency. Dipole antennas are simple, easy to construct, and offer good performance for transmitting and receiving HF signals. They have a balanced design, which allows them to efficiently radiate and receive signals in a wide range of frequencies. Additionally, dipole antennas are lightweight and portable, making them ideal for emergency situations where quick deployment and mobility are important factors.

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  • 21. 

    The relationship of 'Current' is

    • I=VR

    • I=V/R

    • I=IR

    • I=V2R

    Correct Answer
    A. I=V/R
    Explanation
    The relationship of 'Current' is given by Ohm's Law, which states that the current flowing through a conductor is directly proportional to the voltage across it and inversely proportional to the resistance of the conductor. Therefore, the correct relationship is I=V/R, where I represents the current, V represents the voltage, and R represents the resistance.

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  • 22. 

    The transmission power for transmitting amateur radio must not exceed

    • 150 watts

    • 100 watts

    • 50 watts

    • 25 watts

    Correct Answer
    A. 150 watts
    Explanation
    The correct answer is 150 watts because there are regulations in place for amateur radio operators that limit the transmission power. Exceeding this limit can cause interference with other radio communications and violate the rules set by the regulatory authorities. Therefore, it is important for amateur radio operators to adhere to these power limits to ensure smooth and interference-free communication.

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  • 23. 

    Define which antenna comprises of 'Driven Element' as well as 'Reflector Element'?

    • Omni-directional Antenna

    • Half wavelength dipole

    • Yagi Antenna

    • Straight wire antenna

    Correct Answer
    A. Yagi Antenna
    Explanation
    A Yagi antenna is composed of a driven element and a reflector element. The driven element is the part of the antenna that is directly connected to the feedline and carries the radio frequency current. The reflector element, on the other hand, is positioned slightly behind the driven element and helps to increase the antenna's directivity by reflecting and focusing the radio waves in a specific direction. Therefore, a Yagi antenna is the correct answer as it is the only option that includes both a driven element and a reflector element.

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  • 24. 

    A transformer is used to balance a transmission line of 2.5 Ohm with a 300 Ohm antenna. What is the ratio required for the transformer to do this?

    • 1:1

    • 1:120

    • 1:6

    • 1:36

    Correct Answer
    A. 1:120
    Explanation
    A transformer is used to balance a transmission line by matching the impedance of the line with the impedance of the antenna. In this case, the transmission line has an impedance of 2.5 Ohm and the antenna has an impedance of 300 Ohm. The ratio required for the transformer to balance the line is determined by the ratio of the impedances. The impedance ratio is calculated by dividing the impedance of the antenna by the impedance of the transmission line, which is 300/2.5 = 120. Therefore, the ratio required for the transformer is 1:120.

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  • 25. 

    What does the statement "Radio regulation defines amateur radio services as a secondary service whilst broadcasting services is the primary service" ?

    • Each and every frequency band user has equal rights

    • Amateur radio services is permitted to use the frequency band in case of emergency

    • Amateur radio services need to increase its transmission power to overcome any interference from broadcasting services

    • Amateur radio services are permitted to use the frequency band if it does not cause anv interference to broadcasting services

    Correct Answer
    A. Amateur radio services are permitted to use the frequency band if it does not cause anv interference to broadcasting services
    Explanation
    The statement means that according to radio regulation, amateur radio services are considered a secondary service, while broadcasting services are considered the primary service. This implies that amateur radio operators are allowed to use the frequency band as long as it does not cause any interference to the broadcasting services. In other words, they have the right to access the frequency band but must prioritize the needs of the primary service.

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  • 26. 

    What is the frequency band used by an amateur radio for a "Very High Frequency"?

    • 144.000 MHz -146.000 MHz

    • 137.000 MHz -156.000 MHz

    • 144.000 MHz -148.000 MHz

    • 146.000 MHz-148.000 MHz

    Correct Answer
    A. 144.000 MHz -148.000 MHz
  • 27. 

    What type of interference may come from a multi-band antenna connected to a poorly tuned transmitter?

    • Harmonic radiation

    • Auroral distortion

    • Parasitic excitation

    • Intermodulation

    Correct Answer
    A. Harmonic radiation
    Explanation
    When a multi-band antenna is connected to a poorly tuned transmitter, it can result in harmonic radiation. Harmonic radiation refers to the emission of radio waves at frequencies that are multiples of the intended frequency. This interference can cause disruptions and distortions in the communication signals.

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  • 28. 

    Wtih reference to the transistor symbol, which one is the correct answer?

    • I

    • Ii

    • Iii

    • Iv

    Correct Answer
    A. Ii
    Explanation
    The correct answer is ii because it represents a transistor symbol. Transistors are electronic devices that amplify or switch electronic signals and are commonly represented by a triangle with an arrow pointing inward or outward. Option ii matches this description, making it the correct answer.

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  • 29. 

    What is the SI Unit for 'CURRENT' and 'RESISTANCE'?

    • Ampere and Resistor

    • Ampere and Ohm

    • Volt and Ohm

    • Henry and Ohm

    Correct Answer
    A. Ampere and Ohm
    Explanation
    The SI unit for 'CURRENT' is Ampere, which measures the flow of electric charge in a circuit. The SI unit for 'RESISTANCE' is Ohm, which measures the opposition to the flow of electric current in a circuit.

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  • 30. 

    What is the 'Q' code for "Are you ready?" and "What is your location?"

    • QSY and QTH

    • QRV and QSP

    • QRQ arid QSY

    • ORV and OTH

    Correct Answer
    A. ORV and OTH
    Explanation
    http://www.qsl.net/w5www/qcode.html

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  • 31. 

    When should you use simplex operation instead of a repeater?

    • When the most reliable communications are needed

    • When a contact is possible without using a repeater

    • When an emergency telephone call is needed

    • When you are traveling and need some local information

    Correct Answer
    A. When a contact is possible without using a repeater
    Explanation
    When a contact is possible without using a repeater, it means that the distance between the two communicating devices is within the range of direct communication. In this case, using a simplex operation, where communication can only occur in one direction at a time, is sufficient. A simplex operation is more suitable in scenarios where a repeater is not required to extend the range of communication.

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  • 32. 

    What is the modulation used in "Very High Frequency" and "High Frequency"?

    • Single band and multiple band

    • Frequency modulation and amplitude modulation

    • Amplitude modulation and frequency modulation

    • None of the above

    Correct Answer
    A. Frequency modulation and amplitude modulation
    Explanation
    "Very High Frequency" (VHF) and "High Frequency" (HF) are both radio frequency bands. VHF ranges from 30 MHz to 300 MHz, while HF ranges from 3 MHz to 30 MHz. In these frequency bands, both frequency modulation (FM) and amplitude modulation (AM) are commonly used for transmitting signals. FM changes the frequency of the carrier wave to encode information, while AM changes the amplitude of the carrier wave. Therefore, the correct answer is frequency modulation and amplitude modulation.

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  • 33. 

    The Telecommunication Order 2001 under Section 33 states that any person who establishes, installs, maintains, provides or operates a telecommunication system or service within Brunei Darussalam without a license granted shall be guilty of an offence. Which of the following statement of conviction is CORRECT should a person do commit an offence?

    • Any person guilty of an offence under this section shall be liable on conviction to a fine not exceeding $100,000, imprisonment for a term not exceeding 3 years or both.

    • Any person guilty of an offence under this section shall be liable on conviction to a fine not exceeding $10,000, imprisonment fora term not exceeding 1 year or both.

    • Any person guilty of an offence under this section shall be liable on conviction to a fine not exceeding $50,000, imprisonment for a term not exceeding 3 years or both.

    • No fine is liable at all.

    Correct Answer
    A. Any person guilty of an offence under this section shall be liable on conviction to a fine not exceeding $100,000, imprisonment for a term not exceeding 3 years or both.
    Explanation
    The correct answer is that any person guilty of an offence under this section shall be liable on conviction to a fine not exceeding $100,000, imprisonment for a term not exceeding 3 years or both. This is based on the Telecommunication Order 2001, which states that anyone operating a telecommunication system without a license is guilty of an offence. The specified punishment of a fine and imprisonment aligns with the severity of the offence and serves as a deterrent for unauthorized telecommunication activities.

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  • 34. 

    If 'c' is the velocity, 'f' the frequencyand wavelength ''λ', which listed below is the correct formula?

    • λ= f2 x C

    • F= c x λ

    • λ= √(f x λ)

    • λ =c / f

    Correct Answer
    A. λ =c / f
    Explanation
    The correct formula is λ = c / f. This formula represents the relationship between wavelength (λ), velocity (c), and frequency (f). It states that the wavelength is equal to the velocity divided by the frequency. This formula is derived from the basic wave equation, where wavelength is the distance between two corresponding points on a wave, velocity is the speed at which the wave propagates, and frequency is the number of complete cycles of the wave per unit time.

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  • 35. 

    Which direction is the electron flowing in the diagram below?

    • From A to B

    • From D to C

    • From C->A->B->D

    • From D->B->A->C

    Correct Answer
    A. From D->B->A->C
    Explanation
    The diagram shows a circuit with four points labeled A, B, C, and D. The correct answer indicates that the electron is flowing in the direction from point D to point B, then from point B to point A, and finally from point A to point C. This can be inferred based on the arrows drawn in the diagram, which indicate the direction of current flow.

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  • 36. 

    Which of the statement below is INCORRECT regarding installation of amateur radio equipment in a vehicle?

    • Radio equipment can be installed in any vehicle according to remarks in a valid license

    • One unit of licensed radio equipment is only allowed for one vehicle unless stated otherwise in the license

    • Every amateur license holder is allowed to install in anv vehicle that he/she owns

    • Installation of radio equipment and antenna is required to meet the specifications and regulations of road and safety code

    Correct Answer
    A. Every amateur license holder is allowed to install in anv vehicle that he/she owns
    Explanation
    Every amateur license holder is allowed to install in any vehicle that he/she owns.

    The correct answer is that every amateur license holder is allowed to install radio equipment in any vehicle that he/she owns. This statement is incorrect because the installation of radio equipment in a vehicle is subject to the specifications and regulations of road and safety codes. Therefore, it is not true that every license holder can install radio equipment in any vehicle without considering these regulations.

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  • 37. 

    For a frequency of a 15 meter band, which one of the frequency band below is correct for amateur radio?

    • 12.36 - 12.53 MHz

    • 24.89 - 24.99 MHz

    • 50.00 - 54.00 MHz

    • 21.00 - 21.45 MHz

    Correct Answer
    A. 21.00 - 21.45 MHz
    Explanation
    The correct answer is 21.00 - 21.45 MHz. This frequency band falls within the 15 meter band range specified in the question. The other frequency bands listed do not fall within the 15 meter band range, making them incorrect for amateur radio.

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  • 38. 

    What is the number of identical lamps if each draws a current (I) of 500 mA, from a 15A supply:

    • 15

    • 34

    • 30

    • 7500

    Correct Answer
    A. 30
    Explanation
    If each lamp draws a current of 500 mA and the supply is 15A, we can calculate the number of identical lamps by dividing the supply current by the current drawn by each lamp. In this case, 15A divided by 0.5A (500 mA) equals 30 lamps. Therefore, the correct answer is 30.

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  • 39. 

    Define the function of High-pass filter and Low-pass filter?

    • Restrict low frequency and restrict high frequency

    • Restrict high frequency and restrict low frequency

    • Channeling low frequency and channeling high frequency

    • None of the above

    Correct Answer
    A. Restrict low frequency and restrict high frequency
    Explanation
    A high-pass filter allows high-frequency signals to pass through while attenuating low-frequency signals. On the other hand, a low-pass filter allows low-frequency signals to pass through while attenuating high-frequency signals. Therefore, the correct answer is "Restrict low frequency and restrict high frequency" as both filters restrict the frequencies they are designed to filter out.

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  • 40. 

    What unit of measurement specifies RF electric field strength?

    • Coulumbs (C) at one wavelength from the antenna

    • Volts per meter (V/m)

    • Microfarads (uF) at the transmitter output

    • Microhenrys (uH) per square centimeter

    Correct Answer
    A. Volts per meter (V/m)
    Explanation
    Volts per meter (V/m) is the correct unit of measurement that specifies RF electric field strength. This measurement quantifies the electric field intensity in terms of volts per meter of distance from the source. It is commonly used to assess the strength of radio frequency (RF) signals and the potential for electromagnetic radiation exposure.

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  • 41. 

    Four 10,000 ohm resistors are connected in series across a 90 Volt supply. The voltage drop across one of the resistors is:

    • 22.5 Volt

    • 111.1 Volt

    • 90 Volt

    • 5.63 Volt

    Correct Answer
    A. 22.5 Volt
    Explanation
    When resistors are connected in series, the total resistance is the sum of the individual resistances. In this case, the total resistance is 4 times the resistance of one resistor, which is 10,000 ohms. According to Ohm's law, the voltage drop across a resistor is equal to the current flowing through it multiplied by its resistance. Since the current is the same in a series circuit, the voltage drop across each resistor is proportional to its resistance. Therefore, the voltage drop across one of the resistors is 1/4 of the total voltage, which is 22.5 volts.

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  • 42. 

    The relationship of 'Power' is

    • P=V/R

    • P=VR

    • P=IV

    • P=V2R

    Correct Answer
    A. P=IV
    Explanation
    The relationship of 'Power' is given by the equation P=IV. This equation represents the relationship between power (P), current (I), and voltage (V). According to Ohm's law, power is equal to the product of current and voltage. Therefore, the correct answer is P=IV.

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  • 43. 

    What is the total resistance of four 24 Ohms resistors arranged as shown below?

    • 96 Ohms

    • 16 Ohms

    • 6 Ohms

    • 24 Ohms

    Correct Answer
    A. 6 Ohms
    Explanation
    The total resistance of resistors in a parallel circuit is calculated using the formula 1/Rtotal = 1/R1 + 1/R2 + 1/R3 + ... In this case, since all four resistors have the same resistance of 24 Ohms, the formula becomes 1/Rtotal = 1/24 + 1/24 + 1/24 + 1/24. Simplifying this equation gives us 1/Rtotal = 4/24, which can be further simplified to 1/Rtotal = 1/6. Taking the reciprocal of both sides gives us Rtotal = 6 Ohms. Therefore, the correct answer is 6 Ohms.

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  • 44. 

    The Morse code format for 'HELLO?' is:

    • .... . .-.. .-.. --- ..--..

    • .... . ._.. ._.. _ _ _ .._ _.

    • ._.. ._ _ . ._. .._ _.

    • ._.. ._ _ . ._. .._ _..

    Correct Answer
    A. .... . .-.. .-.. --- ..--..
    Explanation
    http://morsecode.scphillips.com/jtranslator.html

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  • 45. 

    What is the wavelength of a 430 MHz wave with (c) speed of light at 3 x 10(power of 8) m/s?

    • 0.143 m

    • 698 mm

    • 698 mm/sec

    • 6.98 um (micro meter)

    Correct Answer
    A. 698 mm
    Explanation
    The wavelength of a wave can be calculated using the formula: wavelength = speed of light / frequency. In this question, the frequency is given as 430 MHz, which can be converted to 430 x 10^6 Hz. The speed of light is given as 3 x 10^8 m/s. By substituting these values into the formula, we get wavelength = (3 x 10^8 m/s) / (430 x 10^6 Hz) = 0.698 m = 698 mm. Therefore, the correct answer is 698 mm.

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  • 46. 

    Two resistors with a 25 Ohms and 20 Ohms connected in series with a 15 Ohms resistor connected in parallel. What is the total resistance of the three resistors and the voltage if a 5A current flows through the circuit?

    • 26.11 Ohms and 130.56 V

    • 26.11 Ohms and 5.22 V

    • 11.25 Ohms and 56.25 V

    • 60 Ohms and 300 V

    Correct Answer
    A. 11.25 Ohms and 56.25 V
    Explanation
    The total resistance of the circuit can be calculated by adding the resistances of the resistors in series and the resistance of the resistor in parallel. In this case, the resistors with 25 Ohms and 20 Ohms are in series, so their resistances can be added together: 25 Ohms + 20 Ohms = 45 Ohms. The resistor with 15 Ohms is connected in parallel, so its resistance can be calculated using the formula: 1/R_parallel = 1/15 + 1/45 = 4/45. Taking the reciprocal of this value gives the resistance of the parallel combination: R_parallel = 45/4 = 11.25 Ohms. Therefore, the total resistance of the three resistors is 11.25 Ohms.

    To calculate the voltage, we can use Ohm's law: V = I * R, where V is the voltage, I is the current, and R is the resistance. Plugging in the values, we have V = 5A * 11.25 Ohms = 56.25 V. Therefore, the total resistance of the three resistors is 11.25 Ohms and the voltage is 56.25 V.

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  • 47. 

    What is the frequency of an alternating current if the time period is 0.75 us (micro seconds)?

    • 1.3 kHz

    • 1.3 MHz

    • 75 Hz

    • 75 kHz

    Correct Answer
    A. 1.3 MHz
    Explanation
    The frequency of an alternating current is determined by the number of cycles it completes in one second. The formula to calculate frequency is frequency = 1 / time period. In this case, the time period is given as 0.75 microseconds (us). To convert this to seconds, we divide by 1,000,000 (1 million). So, the time period in seconds is 0.75 us / 1,000,000 = 0.00000075 s. Now, we can calculate the frequency by taking the reciprocal of the time period: frequency = 1 / 0.00000075 = 1,333,333.33 Hz. To express this in megahertz (MHz), we divide by 1,000,000: 1,333,333.33 Hz / 1,000,000 = 1.33333333 MHz, which can be rounded to 1.3 MHz.

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  • 48. 

    2 resistors are connected in parallel and are connected across a 240 volt battery. If each resistor is 2500 ohms, the total battery current is:

    • 19 ampere

    • 19 milliampere

    • 192 ampere

    • 192 miliampere

    Correct Answer
    A. 192 miliampere
    Explanation
    When resistors are connected in parallel, the total resistance is given by the formula: 1/R_total = 1/R1 + 1/R2. In this case, R1 = R2 = 2500 ohms, so 1/R_total = 1/2500 + 1/2500 = 2/2500. Taking the reciprocal of both sides, R_total = 2500/2 = 1250 ohms.

    According to Ohm's law, V = I * R, where V is the voltage, I is the current, and R is the resistance. Rearranging the formula, I = V/R. In this case, V = 240 volts and R = 1250 ohms, so I = 240/1250 = 0.192 amperes. Converting to milliamperes, the total battery current is 192 milliamperes.

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  • 49. 

    An increase in power from 2 Watts to 5 Watts is equal to a gain of:

    • 2.5 dB

    • 3 dB

    • 4 dB

    • 10 dB

    Correct Answer
    A. 4 dB
    Explanation
    An increase in power from 2 Watts to 5 Watts represents a multiplication factor of 2.5 (5/2). To convert this multiplication factor to decibels (dB), we use the formula: gain in dB = 10 * log10(multiplication factor). Plugging in the value, we get gain in dB = 10 * log10(2.5) ≈ 4 dB. Therefore, the correct answer is 4 dB.

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Quiz Review Timeline (Updated): Mar 21, 2023 +

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  • Mar 21, 2023
    Quiz Edited by
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  • Jun 03, 2008
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    Kriwil
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