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ECE :: Microwave Communication

  1. Assertion (A): Inter-digitated geometry is widely used for microwave transistors.

    Reason (R): Tuning at input and output of transistor uses MOS chip capacitors.

  2. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is correct but R is wrong
    D.
    A is wrong but R is correct

  3. For a 1 cm x 2 cm air filled rectangular waveguide the maximum frequency should be less than about

  4. A.
    1000 MHz
    B.
    5000 MHz
    C.
    14000 MHz
    D.
    140000 MHz

  5. Hollow waveguides are used as transmission lines at frequencies

  6. A.
    above 1 GHz
    B.
    above 5 GHz
    C.
    above 10 MHz
    D.
    above 1 MHz

  7. If rv is reflection coefficient and VSWR is voltage standing wave ratio, then


  8. In the given figure the equivalent circuit of a T attenuator. If the condition for matched attenuator is


  9. The total power radiated from an antenna system is determined by imagining that the antenna is at the centre of a very large

  10. A.
    sphere
    B.
    rectangle
    C.
    square
    D.
    ellipse

  11. The AM, PM, and TV broadcast frequencies are

  12. A.
    of the same order as microwave range
    B.
    much lower than microwave range
    C.
    much higher than microwave range
    D.
    either (a) or (c)

  13. Assertion (A): For a reciprocal microwave junction the S matrix is symmetrical.

    Reason (R): In a symmetrical matrix Sij = Sji.

  14. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is correct but R is wrong
    D.
    A is wrong but R is correct

  15. In TE mode of waveguide Ez = 0

  16. A.
    True
    B.
    False

  17. The primary constants of a transmission line are

  18. A.
    R and L
    B.
    R, L and C
    C.
    R and C
    D.
    R, L, G and C