Menu
Home / ECE / Microwave Communication :: Section 3

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. If a short line is terminated in characteristic impedance it behaves as an infinite line.

    2. A.
    True
    B.
    False

    View Answer

    Workspace

    Discuss Discuss in Forum

  2. Ga As exhibits negative differential mobility

    3. A.
    True
    B.
    False

    View Answer

    Workspace

    Discuss Discuss in Forum

  3. Consider the following statements

    1. Bunching of electrons occurs in two cavity klystron amplifier.
    2. Bunching of electrons occurs in multi cavity klystron amplifier.
    3. Bunching of electrons occurs in reflex cavity klystron amplifier.
    Which of the above statements are correct?

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

    View Answer

    Workspace

    Discuss Discuss in Forum

  4. Assertion (A): For high frequency lines inductive reactance is very high as compared to ac resistance.

    Reason (R): Due to skin effect ac resistance of line is higher than dc resistance.

    5. 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

    View Answer

    Workspace

    Discuss Discuss in Forum

  5. Consider the following applications

    1. Switch
    2. Attenuator
    3. Phase shifter
    4. Oscillator
    In which of the above can a PIN diode be used?

    6. A.
    1 2 3 and 4
    B.
    1 2 and 3 only
    C.
    1 and 2 only
    D.
    2, 3 and 4 only

    View Answer

    Workspace

    Discuss Discuss in Forum

  6. Which one of the following is not a negative resistance device?

    7. A.
    Gunn diode
    B.
    Tunnel diode
    C.
    Impatt diode
    D.
    Varactor diode

    View Answer

    Workspace

    Discuss Discuss in Forum

  7. Microwave links are typically 50 km apart

    8. A.
    because of atmospheric attenuation
    B.
    because of output tube power limitation
    C.
    because of earth's curvature
    D.
    to ensure that applied dc voltage is not excessive

    View Answer

    Workspace

    Discuss Discuss in Forum

  8. For matching over a range of frequencies in a transmission line it is best to use

    9. A.
    a balun
    B.
    a broad band directional coupler
    C.
    double stub
    D.
    a single stub of adjustable position

    View Answer

    Workspace

    Discuss Discuss in Forum

  9. Assertion (A): In the interaction region of magnetron an electron is subjected to three forces: force due to electric field, force due to magnetic field and centrifugal force.

    Reason (R): The mechanism of generation of microwaves, in a magnetron, involves interaction of electromagnetic fields with electrons moving in static electric and magnetic fields oriented at right angles to each other.

    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

    View Answer

    Workspace

    Discuss Discuss in Forum

  10. Which of the following is wrong for a magic used to tee?

    11. A.
    E and H arms are decoupled
    B.
    coplanar arms are coupled
    C.
    all ports are perfectly matched
    D.
    A signal into coplanar arm splits equally between E and H arms

    View Answer

    Workspace

    Discuss Discuss in Forum

Java Programming Questions and Answers Interview Questions and Answers