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ECE :: Microwave Communication

Microwave Communication - Section 1
Microwave Communication - Section 2
Microwave Communication - Section 3
Microwave Communication - Section 4
Microwave Communication - Section 5
Microwave Communication - Section 6
Microwave Communication - Section 7
Microwave Communication - Section 8

  1. In microwave system the function of mode filter is

    2. A.
    to suppress modes with lower cut off frequencies
    B.
    to suppress modes with higher cut off frequencies
    C.
    to change mode of wave transmission
    D.
    both (b) and (c)

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  2. For the strip line in the given figure the capacitance per unit length =

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  3. The total field developed by an antenna array at a distant point is

    4. A.
    phasor sum of fields produced by individual antennas of the array
    B.
    algebraic sum of fields produced by individual antennas of the array
    C.
    either (a) or (b) depending on type of array
    D.
    neither (a) nor (b)

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  4. High speed logic circuits use

    5. A.
    pulses with very small width
    B.
    pulses with very large width
    C.
    pulses whose width is neither small nor large
    D.
    either (b) or (c)

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  5. To couple a coaxial line to a parallel wire line it is best to use

    6. A.
    slotted line
    B.
    balun
    C.
    directional coupler
    D.
    λ/4 transformer

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  6. Assertion (A): A quarter wave transformer is used to match a resistive load to a transmission line.

    Reason (R): A quarter wave transformer is a transmission line of quarter wave length.

    7. 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

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  7. Assertion (A): Magnetron is generally used in n mode.

    Reason (R): Frequency for p mode can be easily separated from adjacent modes.

    8. 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

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  8. A balun should have

    9. A.
    low SWR at both ports
    B.
    high SWR at both ports
    C.
    high SWR at input port and low SWR at output port
    D.
    low SWR at input port and high SWR at output

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  9. Assertion (A): The velocity factor of a line is the ratio of wave velocity on the line to speed of light.

    Reason (R): If the conductors of a line are immersed in a non magnetic insulating liquid, the wave velocity increases.

    10. 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

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  10. In mode filter of the given figure which of the following modes is unaffected

    11. A.
    TE01
    B.
    TE10
    C.
    TE11
    D.
    all TM

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