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INDUSTRIAL TRAINING PRE-ASSESSMENT

There are 3 quizzes in this exercise, divided into Antenna theory, Tracking, Telemetry & Monitoring, Circuitry. This assessment is meant to gauge prior knowledge in all the above aspects for inclusion on the Balloon SAT Training project.

Antenna Assessment

    ASSESMENT QUESTIONS (Pass Mark: 80%)
    Instructions:
     This Paper is composed of 14 single choice and 2 True/False questions.
     True/False: Each question carries 8 marks
     Single choice questions: Each question carries 7 marks
     Answer all questions

    1. The ratio of radiation intensity in a given direction from antenna to the radiation intensity over all directions is called as ________
    DirectivityRadiation power densityGain of antennaArray Factor

    2. What is the overall efficiency of a lossless antenna with reflection coefficient 0.15?
    0.9970.7790.6690.977

    3. Wavefront is basically a locus of points acquiring similar _______
    PhaseFrequencyAmplitudeWave equation

    4. In a non-isotropic directional antenna, which radiating lobe axis makes an angle of 180 w.r.t. major beam of an antenna?
    Minor lobeSide lobeBack lobeNone of the above

    5. From the radiation point of view, small loops are _________radiators
    PoorGoodBetterExcellent

    6. After which phenomenon/phenomena do the waves arrive at the receiving antenna in ionospheric propagation?
    Reflection or ScatteringRefractionDefractionAll of the above

    7. Circular polarization is formed in
    Helical antennaYagi-Uda antennaParabolic antennaDipole antenna

    8. For Yagi-Uda array the term that is not applicable is
    Good bandwidthHigh gainFolded dipoleParasitic elements

    9. Beam width is the measure of directivity of antenna in terms of angles either radians or degrees.
    TrueFalse

    10. Angular width between the first nulls or first side lobes is called as _______
    half power beam widthfull null beam widthbeam areadirectivity

    11. Which of the following statement is true?
    As the number of elements increase in array it becomes more directiveAs the number of elements increase in array it becomes less directivePoint to point communication is not possible with more number of array elementsThere is no uniform progressive phase shift in linear uniform array

    12. . The radiating pattern of single element multiplied by the array factor simply gives the ___________
    Pattern multiplicationNormalized array factorBeam width of the arrayField strength of the array

    13. 1. The directivity of Yagi-Uda antenna is increased by adding ______
    reflectorsdriven elementdirectorsboom

    14. Directors are used to increase ______ of the Yagi-Uda antenna.
    DirectivityGainBack lobeReflection away from the radiation

    15. What is the radiation pattern of a Yagi-Uda antenna?
    Broad-sideEnd-fireCollinearBoth Broadside and End-fire

    16. A narrow beam-width is obtained through a large number of directors.
    TrueFalse

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    Tracking, Telemetry, Command and Monitoring Assessment

      Instructions/Guide:
      This test comprises of 5 structured questions with varying marks on each.
      Attempt all questions.
      Pass mark is 70%.

      1. Briefly explain the following in relation to satellite systems.(10 marks)
      a) Tracking

      b) Telemetry

      c) Command

      2. State at least 3 sub-systems of Telemetry, Tracking, Command and Monitoring. (3 marks)

      3. What are the frequency bands used in satellite communication. (4 marks)

      4. Mention some of the sensors used in orbital location of a satellite. (4 marks)

      5. What are some of the parameters used in typical command link systems. (4 marks)

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      Circuitry Assessment

        Guide: This Paper comprises of single & multi choice answer questions. Questions 1 to 8 are Single choice & Questions 9 to 12 are multi choice Questions.
        Under multi choice answer questions; choosing a wrong answer makes the whole question wrong, all answers must be accurate for a question to be marked right.
        For multi choice questions, each question is 10 marks and for single choice, each question is 7.5 marks.

        1. Which In of the following technologies do satellites work together to aid in navigation?
        radio telescopeoptical telescopeInterstellar space probeGlobal Positioning System

        2. For which one of the following purposes are satellites not used?
        transmitting signals over large distancesmonitoring changes in Earth’s environment over timechanging Earth’s orbitcollecting different types of weather data

        3. In which of the following locations would you expect to find a satellite?
        in the oceanon the surface of another planeton the surface of another planetorbiting Earth

        4. A balloon is filled with helium gas and has a volumetric value of 5.274m3, calculate its diameter and determine the mass it can lift if launched in space at 200 C. Use density of air and helium as 1.29Kg/m3 and 0.18Kg/m3 respectively, 1 feet3 = 28.2g. Which of the following is the correct answer for diameter and capacity?
        2.8416m and 149.30g4.16m and 150g2.16m and 148.73g3.50m and 160g

        5. A battery has a rating of 4500mAh 7.4V and is to be used as a power source for powering the electronic components with a total of 1800mA. What duration will the system take for the battery to be discharged.?
        2.5 hours4.5 hours5.0 hours3.3 hours

        6. Which of the following orbits is used by nanosatellites for space exploration?
        High Earth OrbitLow Earth OrbitMedium Earth OrbitGeo Synchronous orbit

        7. For purposes of data transmission which of the following radio modules can used?
        Global Positioning systemAutomatic Packet Reporting SystemXBee 868 Radio moduleRadio telescope

        8. During launch of the Balloon sat system, which of the following gases can be used for filling the balloon.?
        HeliumHydrogenNitrogenOxygen

        9. For purposes of safety of the weather Balloon sat from harsh weather conditions in space, which of the following materials are recommended for use?
        Aluminum combined with other metalsReusable carbon-carbon compositeCopperStyrofoam

        10. Which of the following are the layers of the Earth’s atmosphere?
        IonosphereStratosphereMesosphereTroposphereExosphere

        11. Space puts satellite and other devices under extreme conditions, which of the following are the harsh conditions of space?
        Line of sightGravityTemperatureAtmospheric pressure.

        12. Which of the following parameters can be measured by a digital multimeter?
        ResistanceCapacitanceVoltageContinuity.

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        FAQs on the Weather Balloon Satellite Student Training

        What is the duration of the training?

        • 6 – 8 Weeks
        • A schedule is provided to the students on the start date

        What does this training entail?

        • Review basic concepts in Space science
        • Problem solving exercises
        • Component and sub component tests
        • Payload assembling

        What are the expectations from students?

        • To complete all preliminary work given
        • To do all laboratory sessions
        • To participate in team activities
        • To be available for both physical and virtual meetings

        What are the prerequisites to start the training?

        • Letter of introduction from the Institution to Space Technology Agency
        • Letter of Internship placement from Space Technology Agency
        • Acceptance letter from the student

        Where will the training take place?

        • At the UICT laboratories for UICT students

        When is the start date?

        • This will be determined by the UICT management

        What will happen at the end of the training?

        • The students will have completed their reports
        • Log books, supervisors’ reports will be completed
        • The students will present the BalloonSAT prototype

        Will there be an opportunity to launch and test the Weather BalloonSAT?

        • The launch and testing are outside of the student training schedule, this is still under discussions with the management of UICT

        Who qualifies to join this training?

        • Any telecoms, electrical and aeronautics engineering students who pass the pre entry assessment

        Are there other training opportunities?

        • Yes, keep an eye out for updates on the Space Technology Agency website and social media pages.