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ECE :: Electromagnetic Field Thoery

  1. A square corner reflector is used in which of the following?

  2. A.
    TV broadcast
    B.
    Point-to-point communication
    C.
    Radio astronomy
    D.
    All of the above

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  3. Which of the following statement is incorrect?

  4. A.
     curl E = -μ jωE
    B.
    C.
    D.
    None of the above

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  5. High frequency waves are

  6. A.
    absorbed by the F2 layer
    B.
    reflected by the D layer
    C.
    affected by the solar cycle
    D.
    none of the above

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  7. The direction of vectors gives the direction of propagation of electromagnetic waves

  8. A.
    Vector (E x H)
    B.
    Vector (F x H)
    C.
    Vector E
    D.
    Vector H

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  9. According to maximum power transfer theorem, the maximum power is absorbed by one network from another network when

  10. A.
    the impedance of one of the networks is half that of the other
    B.
    the impedance of one is the complex conjugate of the other
    C.
    the impedance of one is equal to that of the other
    D.
    none of the above

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  11. A medium is divided into regions I and II about x = 0 plane, as shown in the figure below.
    An EM wave with electric field is incident normally on the interface from region-I.
    The electric field E2 in region-II at the interface is

  12. A.
    E2 = E1
    B.
    C.
    D.

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  13. The static electric field in a conductor is

  14. A.
    zero
    B.
    unity
    C.
    infinity
    D.
    none of the above

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  15. The propagation constant of a transmission line is

  16. A.
    B.
    (R + jωL)(G + ωC)
    C.
    D.
    none of the above

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  17. In a perfect conductor the incident and reflected wave combine to produce

  18. A.
    a stronger incident wave
    B.
    a stronger reflected wave
    C.
    a standing wave which is not progressing
    D.
    none of the above

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  19. MUF is highest in periods of greatest sunspot activity.

  20. A.
    True
    B.
    False

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