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  • Question

  • Match the following:

    List I List II
    A. Penetration frequency 1. Lowest frequency at which charged particles spiral in fixed magnetic field
    B. Optimum working frequency 2. Same as critical and frequency
    C. Gyro frequency 3. Highest frequency of radio waves that can be used
    D. Maximum usable frequency 4. The most effective frequency for ionosphere propagation of radio waves


  • Options
  • A. A-2, B-4, C-1, D-3
  • B. A-4, B-1, C-3, D-2
  • C. A-1, B-3, C-2, D-4

  • Correct Answer
  • A-2, B-4, C-1, D-3 

    • More questions

    • 1. The symbol in figure is for

    • Options
    • A. UJT
    • B. PUT
    • C. SCS
    • D. SBS
      • Discuss
    • 2. Which of these devices can conduct in both directions?

    • Options
    • A. SCR
    • B. SUS
    • C. SBS
    • D. UJT
      • Discuss
    • 3. In the given figure forward current wave has a magnitude of

    • Options
    • A. 0.45 A
    • B. 0.3 A
    • C. 0.2 A
    • D. 0.1 A
      • Discuss
    • 4. A typical signal strength received from a geosynchronous communication satellite is of the order of a few

    • Options
    • A. milliwatts
    • B. kilowatts
    • C. picowatts
    • D. watts
      • Discuss
    • 5. The temperature at which some materials become superconductors is called

    • Options
    • A. Transition temperature
    • B. Curie temperature
    • C. Neel temperature
    • D. Onnes temperature
      • Discuss
    • 6. The advantage of modified series inverter with two inductors and two capacitors is

    • Options
    • A. the intermittent operation of battery is avoided
    • B. efficiency of circuit is more
    • C. the output frequency is low
    • D. all of the above
      • Discuss
    • 7. A chopper cannot be line commutated.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. Three point tracking can be achieved with

    • Options
    • A. gang condenser
    • B. variable selectivity
    • C. paddar capacitor
    • D. any of the above
      • Discuss
    • 9. In TE and TM modes of rectangular waveguides having propagation in z direction

    • Options
    • A. Ez and Hz are both zero
    • B. In TE mode Ez is zero and in TM mode Hz is zero
    • C. In TE mode Hz is zero and in TM mode Ez is zero
    • D. In both TE and TM modes both Ez and Hz are non-zero
      • Discuss
    • 10. Standard AM radio broadcasts are confined to

    • Options
    • A. MF
    • B. HF
    • C. VHF
    • D. UHF
      • Discuss

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