CDC 3D153 Rf Journeyman Volume 1, Unit 4

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Quizzes Created: 8 | Total Attempts: 738
Questions: 12 | Attempts: 86

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3D153 Quizzes & Trivia

A journeyman is a skilled worker who has successfully completed an official apprenticeship qualification in a building trade or craft. The quiz below is a continuation of revision material for the CDC 3d153 Rf Journeyman Volume 1, Unit 4. Take it up and gauge how much you can remember from the unit. All the best!


Questions and Answers
  • 1. 

    (026) Which one of these is not an application of a radio frequency generator?

    • A.

      Verify transmitter frequencies

    • B.

      Troubleshooting receivers

    • C.

      Checking antenna systems

    • D.

      Aligning galvanometers

    Correct Answer
    D. Aligning galvanometers
    Explanation
    Aligning galvanometers is not an application of a radio frequency generator. A radio frequency generator is typically used for tasks such as verifying transmitter frequencies, troubleshooting receivers, and checking antenna systems. However, aligning galvanometers involves adjusting and calibrating the sensitivity and accuracy of galvanometers, which are instruments used to measure small electrical currents. This process does not require the use of a radio frequency generator.

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  • 2. 

    (027) A power reading that uses the abbreviation dBm indicates the

    • A.

      Ratio of decibels relative to a 1-milliwatt standard

    • B.

      Ratio of decibels relative to a 1-megawatt standard

    • C.

      Actual power level expressed in milliwatts

    • D.

      Actual power level expressed in megawatts

    Correct Answer
    A. Ratio of decibels relative to a 1-milliwatt standard
    Explanation
    A power reading that uses the abbreviation dBm indicates the ratio of decibels relative to a 1-milliwatt standard. This means that the power level being measured is being compared to the power level of 1 milliwatt. The dBm unit is commonly used in telecommunications and signal strength measurements to express power levels in a logarithmic scale. By using dBm, it is easier to compare and analyze power levels across different devices and systems.

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  • 3. 

    (028) The measurable frequency and power ranges of the HP 436A power meter are determined by the

    • A.

      Digital display

    • B.

      Power sensor

    • C.

      Power meter

    • D.

      Interface

    Correct Answer
    B. Power sensor
    Explanation
    The correct answer is "power sensor" because the measurable frequency and power ranges of the HP 436A power meter are determined by the capabilities and specifications of the power sensor. The power sensor is responsible for converting the electrical power into a measurable signal, and its range and sensitivity determine the frequency and power levels that can be accurately measured by the power meter. The power meter itself is the device that displays and calculates the measurements, but it relies on the capabilities of the power sensor to determine the ranges.

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  • 4. 

    (028) During what operation is the radio frequency blanking output used on the HP 436A power meter?

    • A.

      While in WATT mode operation

    • B.

      While in REMOTE mode operation

    • C.

      During the automatic zeroing operation

    • D.

      During calibration adjustment operation

    Correct Answer
    C. During the automatic zeroing operation
    Explanation
    The radio frequency blanking output on the HP 436A power meter is used during the automatic zeroing operation. This suggests that during the zeroing process, the power meter utilizes the radio frequency blanking output to ensure accurate measurements by eliminating any interference or noise from the radio frequency signals.

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  • 5. 

    (029) The two switches on the front panel of the wattmeter correspond to the

    • A.

      Power range of the reverse element

    • B.

      Power range of the forward element

    • C.

      Frequency range of the reverse element

    • D.

      Frequency range of the forward element

    Correct Answer
    B. Power range of the forward element
    Explanation
    The two switches on the front panel of the wattmeter correspond to the power range of the forward element. This means that the switches control the power measurement range of the forward element of the wattmeter. The forward element is responsible for measuring the power flowing in the intended direction, and the switches allow the user to select the appropriate power range for accurate measurements.

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  • 6. 

    (029) What feature is useful for making adjustments to optimize any of the parameters which the wattmeter measures?

    • A.

      Peaking aid

    • B.

      Minimum reading

    • C.

      Maximum reading

    • D.

      Standing wave ratio

    Correct Answer
    A. Peaking aid
    Explanation
    A peaking aid is a feature that helps in making adjustments to optimize the parameters measured by a wattmeter. It assists in fine-tuning the readings and ensuring accurate measurements. This feature allows for adjustments to be made to optimize the parameters being measured, enabling better precision and efficiency in wattmeter readings.

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  • 7. 

    (030) Which measurement is not made with a spectrum analyzer?

    • A.

      Frequency stability

    • B.

      Peak-peak voltage

    • C.

      Amplitude modulation

    • D.

      Subcarrier oscillator outputs

    Correct Answer
    B. Peak-peak voltage
    Explanation
    A spectrum analyzer is a device used to measure and display the frequency spectrum of signals. It is primarily used to analyze and measure the frequency content of a signal. Peak-peak voltage, on the other hand, is a measure of the difference between the maximum and minimum voltage levels in a signal. It is not directly related to the frequency spectrum of a signal and therefore cannot be measured using a spectrum analyzer.

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  • 8. 

    (031) Which electronic counter measurement represents the average bit-to-bit time of an input signal?

    • A.

      Period

    • B.

      Scaling

    • C.

      Frequency

    • D.

      Time interval

    Correct Answer
    A. Period
    Explanation
    The correct answer is Period. Period is the time it takes for one complete cycle of a repeating waveform, such as a signal. In the context of electronic counter measurement, the period represents the average bit-to-bit time of an input signal. It is a measure of the time it takes for one bit to be transmitted or processed in the signal.

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  • 9. 

    (031) Which are the correct four classes of electronic counters?

    • A.

      Frequency counters, time counters, microwave counters, and reciprocal counters

    • B.

      Frequency counters, universal counters, microwave counters, and reciprocal counters

    • C.

      Frequency counters, universal counters, period counters, and reciprocal counters

    • D.

      Scaling counters, universal counters, microwave counters, and reciprocal counters

    Correct Answer
    B. Frequency counters, universal counters, microwave counters, and reciprocal counters
    Explanation
    The correct answer is Frequency counters, universal counters, microwave counters, and reciprocal counters. These four classes of electronic counters cover a wide range of applications. Frequency counters are used to measure the frequency of a signal, while universal counters can measure frequency, period, time interval, and other parameters. Microwave counters are specifically designed for high-frequency measurements, and reciprocal counters are used to measure the reciprocal of a signal's frequency. Together, these four classes of counters provide a comprehensive set of tools for electronic measurements.

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  • 10. 

    (032) What function is not part of the communication service monitor?

    • A.

      Radio frequency generator

    • B.

      Analog multimeter

    • C.

      Oscilloscope

    • D.

      Receiver

    Correct Answer
    B. Analog multimeter
    Explanation
    An analog multimeter is not part of the communication service monitor because it is primarily used for measuring voltage, current, and resistance in electrical circuits, rather than analyzing and monitoring communication signals. The other options, such as the radio frequency generator, oscilloscope, and receiver, are all essential components of a communication service monitor as they are used for generating and analyzing radio frequency signals, visualizing waveforms, and receiving and decoding communication signals, respectively.

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  • 11. 

    (033) What operational capability of the communication service monitor receives amplitude and frequency modulated signals?

    • A.

      Scope

    • B.

      Receiver

    • C.

      Generator

    • D.

      Function generator

    Correct Answer
    B. Receiver
    Explanation
    The operational capability of the communication service monitor that receives amplitude and frequency modulated signals is the receiver. The receiver is responsible for capturing and decoding the signals, allowing the monitor to analyze and measure various parameters such as signal strength, quality, and modulation characteristics.

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  • 12. 

    (033) What operational capability of the communication service monitor produce sine, square, and triangle waveforms?

    • A.

      Scope

    • B.

      Duplex

    • C.

      Receiver

    • D.

      Function generator

    Correct Answer
    D. Function generator
    Explanation
    A function generator is a device that can generate various waveforms such as sine, square, and triangle waves. It is commonly used in communication service monitors to test and calibrate the operational capability of the monitor. By producing these waveforms, the function generator allows technicians to evaluate the performance of the monitor's receiver and other components. Therefore, the function generator is the operational capability that produces sine, square, and triangle waveforms in a communication service monitor.

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