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ECE :: Microwave Communication

  1. Which one of the following is also called 'rat race'?

  2. A.
    E plane tee
    B.
    H plane tee
    C.
    Magic tee
    D.
    Hybrid ring

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  3. Radar principle is used in

  4. A.
    detection of aircraft
    B.
    burglar alarms
    C.
    garage door openers
    D.
    all of the above

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  5. In an optional fiber the refractive index of cladding material should be

  6. A.
    nearly 1
    B.
    very low
    C.
    less than that of core
    D.
    more than that of core

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  7. In microwave circuits, a mode transducer is used to

  8. A.
    change mode of wave transmission
    B.
    change direction of wave transmission
    C.
    change polarization of wave transmission
    D.
    change mode, direction or polarization wave transmission

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  9. A waveguide connected to a circularly polarized antenna must be able to efficiently propagate both vertically and horizontally polarised waves.

  10. A.
    True
    B.
    False

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  11. Which of the following is not used as a microwave mixer or detector?

  12. A.
    PIN diode
    B.
    Crystal diode
    C.
    Schottky barrier diode
    D.
    Backward diode

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  13. Integrated fin line can be utilized as a medium for constructing millimeter wave circuits.

  14. A.
    True
    B.
    False

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  15. The secondary constants of a line are

  16. A.
    Z0
    B.
    Z0 and γ
    C.
    Z0, γ and wave velocity
    D.
    Z0, γ and L

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  17. In a loss less line the propagation constant is equal to

  18. A.
    jωLC
    B.
    LC
    C.
    jωLC
    D.
    LC

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  19. A rectangular wave guide has two stubs each of length connected at the source end. The stubs are circuited. Then the stubs present

  20. A.
    an infinite impedance in shunt with line
    B.
    an infinite impedance in series with line
    C.
    a zero impedance in shunt with line
    D.
    a finite impedance in shunt with line

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