Communications Reviewer 1 Multiple Choice

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Communications Reviewer 1 Multiple Choice - Quiz


Questions and Answers
  • 1. 

    It is the scientist who is engaged in the study in the field of acoustics

    • A.

      Acoustician

    • B.

      Acoustist

    • C.

      Acoustics Engineer

    • D.

      Acoustics Scientist

    Correct Answer
    A. Acoustician
    Explanation
    An acoustician is a scientist who specializes in the study of acoustics, which is the branch of physics that deals with the properties of sound and how it interacts with its environment. Acousticians conduct research, design and analyze acoustic systems, and provide solutions for various applications such as noise control, audio engineering, and architectural acoustics. Therefore, the correct answer is Acoustician.

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  • 2. 

    Who coined the term "cyberspace?"

    • A.

      William Gibson

    • B.

      Antonio Meucci

    • C.

      Mel Gibson

    • D.

      Antonio Banderas

    Correct Answer
    A. William Gibson
    Explanation
    William Gibson is the correct answer because he is the science fiction author who coined the term "cyberspace" in his 1984 novel "Neuromancer." Gibson's novel popularized the concept of a virtual reality space accessed through computer networks, and his use of the term has since become widely adopted in discussions about the internet and digital technology.

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  • 3. 

    For educational purposes, who is the person who first discovered/invented the telephone?

    • A.

      Antonio Meucci

    • B.

      William Gibson

    • C.

      Antonio Banderas

    • D.

      Mel Gibson

    Correct Answer
    A. Antonio Meucci
    Explanation
    Antonio Meucci is credited with the invention of the telephone. He was an Italian inventor and is known for developing a working prototype of the telephone in the 1840s. Although Alexander Graham Bell is often associated with the invention of the telephone, Meucci's contributions were acknowledged by the US Congress in 2002, recognizing him as the true inventor of the telephone.

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  • 4. 

    What is the frequency of the middle C?

    • A.

      262 Hz

    • B.

      363 Hz

    • C.

      633 Hz

    • D.

      622 Hz

    Correct Answer
    A. 262 Hz
    Explanation
    Middle C is a specific musical note that is commonly used as a reference point in music. It is typically defined as having a frequency of 262 Hz. This means that the sound wave of middle C repeats 262 times in one second. The other options provided (363 Hz, 633 Hz, and 622 Hz) are not the correct frequencies for middle C.

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  • 5. 

    What is the frequency of the upper side/ above middle C?

    • A.

      524 Hz

    • B.

      534 Hz

    • C.

      544 Hz

    • D.

      554 Hz

    Correct Answer
    A. 524 Hz
    Explanation
    The frequency of the upper side/above middle C is 524 Hz. This means that when playing a note above middle C on a musical instrument, the sound wave produced will vibrate at a frequency of 524 times per second.

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  • 6. 

    It is the loudness level (in PHON) of a watch ticking.

    • A.

      20 PHON

    • B.

      30 PHON

    • C.

      40 PHON

    • D.

      50 PHON

    Correct Answer
    A. 20 PHON
    Explanation
    The correct answer is 20 PHON. PHON is a unit used to measure the loudness level of a sound. A watch ticking is a relatively quiet sound, so it would have a low loudness level. Therefore, 20 PHON is the most appropriate option as it represents a low level of loudness.

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  • 7. 

    What is the maximum limit time of exposure on sound levels between 100 dB and 110 dB?

    • A.

      20 minutes

    • B.

      22 minutes

    • C.

      24 minutes

    • D.

      26 minutes

    Correct Answer
    A. 20 minutes
    Explanation
    Exposure to sound levels between 100 dB and 110 dB should not exceed 20 minutes. This is because prolonged exposure to high sound levels can cause damage to the ears and lead to hearing loss. The 20-minute limit helps to protect individuals from the potential harmful effects of loud noise.

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  • 8. 

    What is the colloquial name for the term "Thin Ethernet"?

    • A.

      Cheapernet

    • B.

      Cheapnet

    • C.

      Choppednet

    • D.

      Thinet

    Correct Answer
    A. Cheapernet
    Explanation
    "Cheapernet" is the colloquial name for the term "Thin Ethernet". This term refers to a type of Ethernet cabling that is less expensive and thinner than the standard Ethernet cabling. It was commonly used in the early days of networking when cost was a significant factor. The name "Cheapernet" reflects the cost-effectiveness of this type of cabling compared to other options.

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  • 9. 

    Local Multipoint Distribution Service (LMDS) operates at what frequency range?

    • A.

      27 - 31 GHz

    • B.

      31 - 35 GHz

    • C.

      35 - 39 GHz

    • D.

      39 - 41 GHz

    Correct Answer
    A. 27 - 31 GHz
    Explanation
    LMDS operates at a frequency range of 27 - 31 GHz. This frequency range is commonly used for wireless broadband communication. LMDS is a wireless communication technology that provides high-speed data transmission over short distances. It is often used in urban areas where the deployment of wired infrastructure is difficult or expensive. The 27 - 31 GHz frequency range allows for high data transfer rates and low latency, making it suitable for applications that require fast and reliable internet connectivity.

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  • 10. 

    A video signal that has no sync signal is what you called

    • A.

      Non-composite Video Signal

    • B.

      Composite Video Signal

    • C.

      Non Video Signal

    • D.

      None of the choices

    Correct Answer
    A. Non-composite Video Signal
    Explanation
    A video signal that has no sync signal is referred to as a non-composite video signal. This means that the video signal does not include the synchronization information necessary for proper display. In a composite video signal, the sync signal is combined with the video signal to ensure correct timing and synchronization between the display device and the video source. Therefore, a video signal without a sync signal would be considered a non-composite video signal.

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  • 11. 

    It is the gas that is used in jet engines.

    • A.

      Hydrazine

    • B.

      Dryhazine

    • C.

      Hitrazine

    • D.

      Monozine

    Correct Answer
    A. Hydrazine
    Explanation
    Hydrazine is the correct answer because it is a highly reactive and toxic chemical compound that is commonly used as a propellant in rocket and jet engines. It is known for its high energy content and ability to generate large amounts of thrust, making it an ideal fuel for powering aircraft engines. Additionally, hydrazine has a low freezing point and is stable at high temperatures, further enhancing its suitability for use in jet engines.

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  • 12. 

    A satellite is put into final geosynchronous orbit from its transfer orbit by firing the __________.

    • A.

      Apogee kick motor

    • B.

      Perigee kick motor

    • C.

      Apogee punch motor

    • D.

      Perigee punch motor

    Correct Answer
    A. Apogee kick motor
    Explanation
    The correct answer is apogee kick motor. A satellite is put into its final geosynchronous orbit from its transfer orbit by firing the apogee kick motor. The apogee kick motor is responsible for providing the necessary thrust to increase the satellite's apogee (the point in its orbit farthest from the Earth) and adjust its orbit to achieve the desired geosynchronous orbit. This motor is typically used to circularize the satellite's orbit and ensure it stays in a fixed position relative to the Earth's surface.

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  • 13. 

    A terrestrial communications channel linking an earth station to a local switching network or population center

    • A.

      Backhaul

    • B.

      Fronthaul

    • C.

      SideHaul

    • D.

      TopHaul

    Correct Answer
    A. Backhaul
    Explanation
    Backhaul refers to a terrestrial communications channel that connects an earth station to a local switching network or population center. It is the transmission of data from a remote site back to a central site or data center. This term is commonly used in the telecommunications industry to describe the network infrastructure that carries data traffic between cell towers and the core network. It is an essential component in providing reliable and efficient communication services to end-users.

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  • 14. 

    Polytetrafluoroethylene is also known as

    • A.

      Teflon

    • B.

      Micah

    • C.

      Glass

    • D.

      Tissue

    Correct Answer
    A. Teflon
    Explanation
    Polytetrafluoroethylene, commonly known as Teflon, is a synthetic fluoropolymer of tetrafluoroethylene. It is well-known for its nonstick properties and is widely used as a coating for cookware and in various industrial applications. Teflon is highly resistant to heat, chemicals, and electrical conductivity, making it a versatile material. Micah, glass, and tissue are unrelated to polytetrafluoroethylene and do not refer to its alternate names or characteristics.

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  • 15. 

    For SSB transmitter, the average power is typically __________ of the peak envelope power, with a typical human speech

    • A.

      1/4 to 1/3

    • B.

      1/5 to 1/4

    • C.

      1/3 to 1/2

    • D.

      1/8 to 1/5

    Correct Answer
    A. 1/4 to 1/3
    Explanation
    For SSB (Single Sideband) transmitters, the average power is typically 1/4 to 1/3 of the peak envelope power. This means that the power of the transmitted signal, on average, is about one-fourth to one-third of the maximum power that the transmitter is capable of producing. This is because SSB modulation techniques allow for the elimination of one of the sidebands and the carrier signal, resulting in a more efficient use of power compared to other modulation techniques. Additionally, the typical human speech signal has a dynamic range that is well-suited for this power range.

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  • 16. 

    It is often called text messaging, is a means of sending short messages to and from mobile phones.

    • A.

      The Short Message Service (SMS)

    • B.

      The Long Message Service (LMS)

    • C.

      The Multimedia Message Service (MMS)

    • D.

      None of the choices

    Correct Answer
    A. The Short Message Service (SMS)
    Explanation
    SMS, or Short Message Service, is a means of sending short messages to and from mobile phones. It is often referred to as text messaging. This service allows users to send and receive brief messages, typically limited to 160 characters. SMS has become a popular form of communication due to its convenience and widespread availability on mobile devices. It is not to be confused with LMS (Long Message Service) or MMS (Multimedia Message Service), which offer different capabilities for sending longer messages or messages with multimedia content.

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  • 17. 

    North American type of sound files as a substitute for MP3

    • A.

      AC-3 Dolby

    • B.

      AC-4 Dolby

    • C.

      AC-5 Dolby

    • D.

      AC-2 Dolby

    Correct Answer
    A. AC-3 Dolby
    Explanation
    AC-3 Dolby is the correct answer because it is a sound file format commonly used in North America as a substitute for MP3. AC-4, AC-5, and AC-2 Dolby are not commonly used sound file formats and therefore not suitable substitutes for MP3.

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  • 18. 

    A table showing the pre-calculated position of satellite at any given time

    • A.

      Ephemeris

    • B.

      Edomeris

    • C.

      Both of the choices

    • D.

      None of the choices

    Correct Answer
    A. Ephemeris
    Explanation
    Ephemeris refers to a table or data that provides the pre-calculated positions of a satellite at any given time. It is a valuable resource for tracking and predicting the location of satellites. The term "Edomeris" is not a recognized term in this context, and therefore, it is not a correct answer. The correct answer is "Ephemeris."

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  • 19. 

    How many Horizontal scanning lines are there in HDTV?

    • A.

      1125

    • B.

      562.5

    • C.

      1200

    • D.

      281.25

    Correct Answer
    A. 1125
    Explanation
    HDTV has 1125 horizontal scanning lines. This means that the screen is divided into 1125 horizontal rows, each containing pixels that make up the image. The more scanning lines a display has, the higher the resolution and clarity of the image. Therefore, 1125 is the correct answer for the number of horizontal scanning lines in HDTV.

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  • 20. 

    How long that a GPS satellite completes its orbit?

    • A.

      12 hrs

    • B.

      6 hrs

    • C.

      24 hrs

    • D.

      18 hrs

    Correct Answer
    A. 12 hrs
    Explanation
    A GPS satellite completes its orbit in 12 hours. This is because the GPS satellite system is designed to have satellites in six different orbital planes, with each plane containing four satellites. The satellites are evenly spaced in their respective planes to ensure continuous coverage. By having satellites in multiple planes, the system can provide global coverage. Each satellite orbits the Earth twice a day, taking approximately 12 hours to complete one orbit. This allows for accurate positioning and navigation data to be transmitted to GPS receivers on the ground.

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  • 21. 

    What is the other term for parity check?

    • A.

      Vertical Redundancy Check

    • B.

      Horizontal Redundancy Check

    • C.

      Vertical Check

    • D.

      Horizontal Check

    Correct Answer
    A. Vertical Redundancy Check
    Explanation
    The other term for parity check is Vertical Redundancy Check. This method is used to detect errors in data transmission by adding an extra bit to each data unit. This extra bit is used to ensure that the total number of 1s in the data unit, including the extra bit, is either even or odd. If the count of 1s does not match the expected parity, an error is detected. Therefore, the term "Vertical Redundancy Check" is synonymous with parity check.

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  • 22. 

    What is the other name for single button microphone?

    • A.

      Carbon Button

    • B.

      Mono Phone

    • C.

      Buttonphone

    • D.

      Micro Button

    Correct Answer
    A. Carbon Button
    Explanation
    A single button microphone is commonly known as a Carbon Button microphone. This type of microphone uses a carbon button as the main component to convert sound waves into electrical signals. The carbon button acts as a variable resistor, changing its resistance as it vibrates in response to sound waves. This variation in resistance is then converted into an electrical signal that can be amplified and transmitted.

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  • 23. 

    Instrument that is used in measuring the virtual height of ionosphere

    • A.

      Ionosonde

    • B.

      Isocone

    • C.

      Ionicode

    • D.

      Virtual Ion

    Correct Answer
    A. Ionosonde
    Explanation
    An ionosonde is an instrument used to measure the virtual height of the ionosphere. It works by transmitting a radio wave signal towards the ionosphere and then receiving the reflected signal. By analyzing the time it takes for the signal to travel and return, the ionosonde can determine the virtual height of the ionosphere at different frequencies. This information is crucial for studying and understanding the behavior of the ionosphere, which is important for various applications like radio communication and navigation systems.

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  • 24. 

    An instrument used to measure relative height, layers in the ionosphere regarding wave propagation?

    • A.

      Ionosonde

    • B.

      Isocone

    • C.

      Ionicode

    • D.

      Virtual Ion

    Correct Answer
    A. Ionosonde
    Explanation
    An ionosonde is an instrument used to measure the relative height and layers in the ionosphere in terms of wave propagation. It is specifically designed to study the ionosphere and its characteristics, such as electron density, frequency, and amplitude of radio waves. By sending out radio waves and analyzing the reflected signals, an ionosonde can provide valuable information about the ionosphere's structure and behavior. The other options, Isocone, Ionicode, and Virtual Ion, are not instruments used for this purpose and are not related to measuring the ionosphere.

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  • 25. 

    In a trapezoid modulation, 100% modulation will result to what waveform?

    • A.

      Triangular waveform

    • B.

      Square waveform

    • C.

      Sine waveform

    • D.

      Sawtooth waveform

    Correct Answer
    A. Triangular waveform
    Explanation
    In a trapezoid modulation, the 100% modulation will result in a triangular waveform. This is because trapezoid modulation involves varying the amplitude of a carrier signal by a modulating signal. When the modulation is at 100%, the amplitude of the carrier signal is fully varied, resulting in a waveform that resembles a triangle with straight sides and a pointed peak.

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  • 26. 

    It is the type of navigation that is based in Newton's Law of motion

    • A.

      Inertial Navigation System

    • B.

      Newton's Navigation System

    • C.

      Reactional Navigation System

    • D.

      Interactional Navigation System

    Correct Answer
    A. Inertial Navigation System
    Explanation
    The correct answer is Inertial Navigation System. Inertial navigation is a type of navigation system that relies on Newton's laws of motion. It uses accelerometers and gyroscopes to measure changes in velocity and direction, allowing for accurate tracking of an object's position and movement. This system is commonly used in aircraft, submarines, and spacecraft, where GPS signals may be unavailable or unreliable.

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  • 27. 

    What type of navigation system that currently used in aircraft, submarines, spacecraft and guided missiles.

    • A.

      Inertial Navigation System

    • B.

      Guided Missile System

    • C.

      Warcraft Navigation System

    • D.

      None of the choices

    Correct Answer
    A. Inertial Navigation System
    Explanation
    The correct answer is Inertial Navigation System. This type of navigation system is currently used in aircraft, submarines, spacecraft, and guided missiles. It uses a combination of accelerometers and gyroscopes to measure the vehicle's acceleration and rotation, allowing it to calculate its position and orientation. This system is independent of external references such as GPS and is therefore highly reliable and accurate.

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  • 28. 

    What is the successor of Bluetooth?

    • A.

      Lisbon

    • B.

      Infrared

    • C.

      Seattle

    • D.

      Redtooth

    Correct Answer
    A. Lisbon
  • 29. 

    What is the successor of Bluetooth after Lisbon?

    • A.

      Seattle

    • B.

      Infrared

    • C.

      Lisbon

    • D.

      Redtooth

    Correct Answer
    A. Seattle
    Explanation
    The successor of Bluetooth after Lisbon is Seattle. This implies that Seattle is the next technology or version that is expected to replace or succeed Bluetooth after Lisbon.

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  • 30. 

    Carrier freq is also known as

    • A.

      Rest freq

    • B.

      Courier freq

    • C.

      Horse freq

    • D.

      Navigational freq

    Correct Answer
    A. Rest freq
    Explanation
    Carrier frequency refers to the frequency of the electromagnetic wave that is used to carry the information signal in a communication system. It is also known as the "rest frequency" because it represents the base frequency at which the carrier wave operates. The other options, such as "courier freq," "horse freq," and "navigational freq," do not accurately describe the concept of carrier frequency and are therefore incorrect.

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  • 31. 

    Who developed the superheterodyne receiver

    • A.

      Edwin Armstrong

    • B.

      Thomas Edison

    • C.

      Albert Einstein

    • D.

      Heinrich Hertz

    Correct Answer
    A. Edwin Armstrong
    Explanation
    Edwin Armstrong developed the superheterodyne receiver. The superheterodyne receiver is a type of radio receiver that uses frequency mixing to convert the incoming radio frequency signal to a fixed intermediate frequency. This intermediate frequency is easier to amplify and process, resulting in better signal quality and selectivity. Armstrong's invention revolutionized radio technology and became the standard for radio receivers, leading to significant advancements in communication systems.

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  • 32. 

    When the angle of incidence is equal to the angle of refraction, the light in the fiber optics is in what direction

    • A.

      Along the normal path

    • B.

      In a multiple path

    • C.

      Along reflected path

    • D.

      Along refracted path

    Correct Answer
    A. Along the normal path
    Explanation
    When the angle of incidence is equal to the angle of refraction, it means that the light is entering the fiber optics at a specific angle and bending at the same angle as it passes through the interface between two mediums. This phenomenon is known as total internal reflection. In this case, the light continues to travel along the normal path, following the direction perpendicular to the interface.

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  • 33. 

    What refers to the sampling of analog signal using a sample and hold circuit, such that the sample has the same amplitude for its whole duration

    • A.

      Flat top sample

    • B.

      Flat down sample

    • C.

      Top sample

    • D.

      Down sample

    Correct Answer
    A. Flat top sample
    Explanation
    A flat top sample refers to the sampling of an analog signal using a sample and hold circuit in such a way that the sampled signal maintains a constant amplitude throughout its entire duration. This means that the sampled signal does not experience any variations or fluctuations in its amplitude during the sampling process.

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  • 34. 

    What is the antenna height of a CB (Citizen Band) radio?

    • A.

      60 ft above the ground and 20 above the building

    • B.

      300 ft above the ground and 60 above the building

    • C.

      100 ft above the ground and 50 above the building

    • D.

      80 ft above the ground and 30 above the building

    Correct Answer
    A. 60 ft above the ground and 20 above the building
    Explanation
    The antenna height of a CB (Citizen Band) radio is 60 ft above the ground and 20 ft above the building.

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  • 35. 

    What is the nearest star in the solar system

    • A.

      Proxima centauri

    • B.

      Neutron star

    • C.

      White dwarf

    • D.

      Orion

    Correct Answer
    A. Proxima centauri
    Explanation
    Proxima Centauri is the nearest star to our solar system. It is a red dwarf star located about 4.24 light-years away from Earth in the Alpha Centauri star system. Proxima Centauri is closer to us than any other known star, making it the correct answer to the question. Neutron stars and white dwarfs are different types of stars that are not the closest to our solar system. Orion, on the other hand, is not a star but a constellation in the night sky.

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  • 36. 

    A rocket has two satellites, the smaller will continue to propel in the space after the bigger satellite has been launched. What do you call this bigger satellite?

    • A.

      Initial payload

    • B.

      Final payload

    • C.

      Giant payload

    • D.

      Golliath payload

    Correct Answer
    A. Initial payload
    Explanation
    The term "initial payload" refers to the bigger satellite that is launched first from the rocket. This satellite is responsible for carrying and deploying the smaller satellite into space. Once the smaller satellite is launched, the bigger satellite's mission is complete, and it will continue to propel in space while the smaller satellite carries out its intended tasks.

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  • 37. 

    What antenna is used in radar?

    • A.

      Horn with parabolic reflector which rotates 360 degree

    • B.

      Horn with parabolic reflector which rotates 180 degree

    • C.

      Horn with parabolic reflector which rotates 270 degree

    • D.

      Horn with parabolic reflector which rotates 120 degree

    Correct Answer
    A. Horn with parabolic reflector which rotates 360 degree
    Explanation
    The correct answer is "horn with parabolic reflector which rotates 360 degree". This type of antenna is commonly used in radar systems because it provides a wide coverage area and allows for scanning the entire surrounding space. The rotation of the antenna helps in detecting and tracking objects from different directions, ensuring comprehensive radar coverage. The horn shape of the antenna helps in focusing and directing the radar signals, while the parabolic reflector enhances the antenna's gain and directivity.

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  • 38. 

    What is the distance which needs a repeater in the microwave communication?

    • A.

      40 km

    • B.

      60 km

    • C.

      80 km

    • D.

      20 km

    Correct Answer
    A. 40 km
    Explanation
    Microwave communication involves transmitting signals using microwave frequencies. These signals can travel long distances without the need for repeaters. However, as the distance increases, the signal strength weakens. A repeater is used to amplify and regenerate the signal, ensuring it reaches its destination without significant degradation. In this case, the correct answer is 40 km, indicating that after this distance, a repeater is typically required to maintain the signal quality in microwave communication.

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  • 39. 

    Terrestrial microwave antennas has an input and output impedance of ________ ohms.

    • A.

      50

    • B.

      60

    • C.

      70

    • D.

      40

    Correct Answer
    A. 50
    Explanation
    Terrestrial microwave antennas typically have an input and output impedance of 50 ohms. This impedance value is commonly used in microwave communication systems, as it provides a balanced and efficient transfer of power between the antenna and the transmission line. It ensures minimal signal loss and maximizes the signal strength, making it the standard impedance for many microwave antenna designs.

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  • 40. 

    Radio format that uses Mpeg 4 video compression

    • A.

      Divx

    • B.

      Divv

    • C.

      Divy

    • D.

      Divz

    Correct Answer
    A. Divx
    Explanation
    Divx is the correct answer because it is a popular video codec that uses Mpeg 4 video compression. It allows for high-quality video playback while maintaining a relatively small file size. Divx is widely used for compressing and distributing videos over the internet, making it a suitable choice for radio formats that incorporate video content. Divv, Divy, and Divz are not valid options as they do not correspond to any known video compression formats.

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  • 41. 

    What is the typical value of velocity factor of an open wire transmission line?

    • A.

      0.9

    • B.

      1.0

    • C.

      0.8

    • D.

      1.1

    Correct Answer
    A. 0.9
    Explanation
    The typical value of the velocity factor of an open wire transmission line is 0.9. Velocity factor is a measure of how fast a signal travels through a transmission line compared to the speed of light in a vacuum. A value of 0.9 means that the signal travels at 90% of the speed of light in a vacuum.

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  • 42. 

    Type of resistor use to reduced flicker noise voltage (0.02 to 0.2 mV)

    • A.

      Metal film

    • B.

      Carbon film

    • C.

      Mono film

    • D.

      Cinema film

    Correct Answer
    A. Metal film
    Explanation
    Metal film resistors are commonly used to reduce flicker noise voltage in electronic circuits. Flicker noise, also known as 1/f noise, is a type of noise that increases at lower frequencies. Metal film resistors have a low noise level and are known for their stability and accuracy. They provide a consistent and reliable performance, making them suitable for applications where low noise is essential. Carbon film resistors, on the other hand, tend to have higher noise levels and are not as effective in reducing flicker noise voltage. Mono film and cinema film are not relevant to the reduction of flicker noise voltage.

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  • 43. 

    In 2002, a standard for (BWA) Broadband Wireless Access was introduced and in the IEEE standard it is more commonly known as 802.16. This also refers to

    • A.

      WiMax

    • B.

      WiBro

    • C.

      Zigbee

    • D.

      None of the choices

    Correct Answer
    A. WiMax
    Explanation
    The correct answer is WiMax. In 2002, a standard for Broadband Wireless Access (BWA) was introduced, which is commonly known as 802.16 in the IEEE standard. WiMax is a technology that is based on this standard and provides wireless broadband access over long distances. It allows for high-speed internet connections and is often used in areas where wired connections are not feasible or cost-effective. WiBro and Zigbee are other wireless communication technologies, but they are not directly related to the 802.16 standard. Therefore, the correct answer is WiMax.

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  • 44. 

    The current digital video specification that used video compression

    • A.

      MPEG 4

    • B.

      MPEG 1

    • C.

      MPEG 2

    • D.

      MPEG 3

    Correct Answer
    A. MPEG 4
    Explanation
    MPEG 4 is the correct answer because it is the current digital video specification that is widely used for video compression. MPEG 4 provides efficient compression algorithms, allowing for high-quality video playback and streaming over various platforms and devices. It offers advanced features such as object-based coding, interactivity, and scalability, making it suitable for a wide range of applications including video conferencing, streaming services, and multimedia content delivery.

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  • 45. 

    802.15.4 is also known as

    • A.

      Zigbee

    • B.

      WiMax

    • C.

      WiBro

    • D.

      None of the choices

    Correct Answer
    A. Zigbee
    Explanation
    802.15.4 is a standard for low-rate wireless personal area networks (WPANs). Zigbee is a communication protocol built on top of the 802.15.4 standard, specifically designed for low-power, low-data-rate, and short-range wireless communication. Therefore, Zigbee is the correct answer as it is a well-known and widely used technology that is based on the 802.15.4 standard. WiMax and WiBro are different wireless communication standards that operate in different frequency ranges and have different characteristics, so they are not equivalent to 802.15.4.

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  • 46. 

    In radio communication, what is the point on a line between the earth’s center and an observer, located further from the earth’s center on a point?

    • A.

      Nadir

    • B.

      Zenith

    • C.

      Lowbe

    • D.

      Netar

    Correct Answer
    A. Nadir
    Explanation
    The correct answer is Nadir. In radio communication, the nadir is the point on a line between the Earth's center and an observer that is located further from the Earth's center. It is the opposite of the zenith, which is the point directly above the observer. The nadir is often used to refer to the lowest point or the point of greatest depression.

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  • 47. 

    A camera tube that is formed from lead oxide (PbO)

    • A.

      Plumbicon

    • B.

      Saticon

    • C.

      Pasecon

    • D.

      Trinicon

    Correct Answer
    A. Plumbicon
    Explanation
    Plumbicon is the correct answer because it is a type of camera tube that is made from lead oxide (PbO). Lead oxide is used in the construction of Plumbicon tubes because it has high sensitivity to light and can generate a high-quality video signal. Plumbicon tubes were commonly used in professional video cameras and offered better performance compared to other camera tube technologies such as Saticon, Pasecon, and Trinicon.

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  • 48. 

    What part of visible spectrum where camera pick up that has the greatest output?

    • A.

      Yellow Green

    • B.

      White

    • C.

      Violet

    • D.

      Blue Green

    Correct Answer
    A. Yellow Green
    Explanation
    The camera picks up the part of the visible spectrum that has the greatest output in the Yellow Green range. This means that the camera is most sensitive to capturing light in this specific range, resulting in a higher output or intensity of colors in the Yellow Green region.

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  • 49. 

    In a telephone channel, if the total via net loss of a given trunk circuits exceeds approximately 2.5 dB, a device known as ___________ is inserted.

    • A.

      Echo Suppressor

    • B.

      Echo Trimmer

    • C.

      Echo Filter

    • D.

      None of the choices

    Correct Answer
    A. Echo Suppressor
    Explanation
    When the total via net loss of a given trunk circuit in a telephone channel exceeds approximately 2.5 dB, an Echo Suppressor is inserted. An Echo Suppressor is a device used to reduce or eliminate the echo that occurs during a phone call. It helps to improve the quality of the audio by suppressing the echo caused by the transmission of the signal.

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  • 50. 

    In CMTS, the frequency separation between forward and reverse channel is

    • A.

      45 MHz

    • B.

      50 MHz

    • C.

      55 MHz

    • D.

      35 MHz

    Correct Answer
    A. 45 MHz
    Explanation
    The correct answer is 45 MHz. In a CMTS (Cable Modem Termination System), the forward channel is used to transmit data from the service provider to the end user, while the reverse channel is used for data transmission from the end user to the service provider. The frequency separation between these two channels is important to prevent interference and ensure efficient communication. In this case, the frequency separation is 45 MHz, meaning that there is a gap of 45 MHz between the frequencies used for the forward and reverse channels.

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Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 16, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jun 28, 2013
    Quiz Created by
    EcE_phoenix
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