Home / ECE / Microwave Communication :: Section 7

ECE :: Microwave Communication

  1. In terms of R, L, G and C the propagation constant γ of a transmission line is

  2. View Answer

    Workspace

    Discuss Discuss in Forum


  3. The p mode of operation of magnetron signifies that

  4. A.
    the phase difference between adjacent anode poles is p radians
    B.
    the phase difference between adjacent anode poles is a multiple of p radians
    C.
    the total phase shift around the periphery is p radians
    D.
    none of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. Consider the following statements (L is the length of array between centres of end antennas and A is wave-length)

    1. Width of major lobe between nulls of broad side array and end fire array are different.
    2. Directive gain of broadside array and end fire array are different.
    3. Directive gain of broadside array is 4
    Which of the above statements are correct?

  6. A.
    1, 2 and 3
    B.
    1 and 2 only
    C.
    1 only
    D.
    1 and 3 only

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. The electrical requirement on wall thickness of rectangular wave guide is

  8. A.
    wall thickness is more than skin depth
    B.
    wall thickness is less than skin depth
    C.
    wall thickness is equal to skin depth
    D.
    either (b) or (c)

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. If a microstrip is enclosed in a metal enclosure

  10. A.
    the radiation losses are increased
    B.
    the radiation losses are reduced RL
    C.
    the capacitance becomes zero
    D.
    the inductance becomes zero

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. In the given figure power meters at A and B indicate 1 mW and 110 μW respectively. VSWR of line is

  12. A.
    1.5
    B.
    2
    C.
    2.5
    D.
    3

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. As frequency is increased, the skin effect

  14. A.
    increases
    B.
    decreases
    C.
    remains the same
    D.
    either (b) or (c)

    View Answer

    Workspace

    Discuss Discuss in Forum


  15. In a rectangular waveguide there is one half wave variation of electric field across the narrow dimension and two half wave variations of electric field across wider dimension. The dominant mode is

  16. A.
    TM12
    B.
    TE13
    C.
    TE21
    D.
    TM25

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. VTM stands for voltage tunable magnetron.

  18. A.
    True
    B.
    False

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. Which of the following is used in integrated circuits?

  20. A.
    Microstrip line
    B.
    Coaxial line
    C.
    Twin wire line
    D.
    Shield cable

    View Answer

    Workspace

    Discuss Discuss in Forum