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ECE :: Electromagnetic Field Thoery

  1. Calculate the wave impedance for TM mode in rectangular waveguide for dominant mode at 3 GHz having

  2. A.
    (120p) Ω
    B.
    377 Ω
    C.
    226 Ω
    D.
    629 Ω

  3. The divergence of the electric field intensity at any point equals

  4. A.
    1/4 pε0 times the volume charge density
    B.
    l/ε0 times the volume charge density at that point
    C.
    ε0 times the volume charge density at that point
    D.
    the volume charge density at that point

  5. For a 400 kHz transmission line having L = 0.5 mH/km, C = 0.08 mF and negligible R and G, the value of propagation constant P will be

  6. A.
    15.9 radians/km
    B.
    31.8 radians/km
    C.
    63.6 radians/km
    D.
    105.4 radians/km

  7. The Depth of penetration of EM wave in medium having conductivity σ at a frequency of 1 MHz is 25 cm. The depth of penetration at a frequency of 4 MHz will be

  8. A.
    6.25 cm
    B.
    12.50 cm
    C.
    50 cm
    D.
    100 cm

  9. What is the characteristic impedance at 10 MHz?

  10. A.
    547.7 Ω
    B.
    54.7 Ω
    C.
    5.47 Ω
    D.
    .547 Ω

  11. The torque (in mm) acting on a circular current loop of radius 1 mm in the xy plane, connected at the origin and with current 0.1 A, flowing in the sense of increasing in a magnetic field
    is

  12. A.
    B.
    C.
    10-12p
    D.
    - 10-12p

  13. Which one of the following potential does not satisfy Laplace's equations?

  14. A.
    v = 10 xy
    B.
    v = p cos φ
    C.
    D.
    v = f cos φ + 10

  15. A rectangular waveguide measures 3 x 4.5 cm internally and has a 10 GHz signal propagated in it. Calculate the wave impedance for dominant mode.

  16. A.
    130 p
    B.
    1.3 p
    C.
    120 p
    D.
    12 p

  17. Calculate wave impedance for TE mode

  18. A.
    (377)Ω
    B.
    226 Ω
    C.
    D.
    629 Ω

  19. In a 100 turn coil, if the flux through each turn is (t3 - 2t)mWb, the magnitude of the induced emf in the coil at a time of 4 sec is

  20. A.
    46 mV
    B.
    56 mV
    C.
    4.6 V
    D.
    5.6 V