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ECE :: Electromagnetic Field Thoery

  1. Poynting vector gives
  2. A.
    Rate of energy flow
    B.
    Direction of polarization
    C.
    Intensity of electric field
    D.
    Intensity of magnetic field

  3. If a transmission line with characteristic impedance Z1 is connected to a transmission line with characteristic impedance Z2. If the system is being driven by a generator connected to the first line, then the overall transmission coefficient will be
  4. A.
    2 Z1/(Z1+ Z2)
    B.
    Z1/(Z1+ Z2)
    C.
    2 Z2/(Z1+ Z2)
    D.
    Z2/(Z1+ Z2)

  5. Which of the following is the Poisson's equation
  6. A.
    ∇2 V = - ρ/ ∈
    B.
    ∇2 V = - 4πσ
    C.
    ∇2 V = - 4πρ
    D.
    ∇2 V = 0

  7. If An electromagnetic wave is incident obliquely at the surface of a dielectric medium 2(µ2 , ∈2) from dielectric medium 1(µ1 , ∈1), The angle of incidence & the critical angle are θi and θc respectively. Then the phenomenon of total reflection occurs when
  8. A.
    ∈1 > ∈2 and θi < θc
    B.
    ∈1 < ∈2 and θi > θc
    C.
    ∈1 < ∈2 and θi < θc
    D.
    ∈1 > ∈2 and θi > θc

  9. Which one of the following conditions will not guarantee a distortionless Transmission Line
  10. A.
    R = 0 , G = 0
    B.
    LG = RC
    C.
    R >> ω L , G >> ω C
    D.
    R << ω L , G << ω C

  11. When the separation between two charges increases, the electric potential energy of charges
  12. A.
    Increases
    B.
    Decreases
    C.
    Remains the same
    D.
    May increase or decrease

  13. For which of the following statement does the Divergence theorem is applicable
  14. A.
    Static field only
    B.
    Time varying fields only
    C.
    Both static & time varying fields
    D.
    Electric fields only

  15. A hollow rectangular waveguide acts as a ________
  16. A.
    High pass filter
    B.
    Low pass filter
    C.
    Band pass filter
    D.
    Low frequency radiator

  17. When an EM wave is incident on a dielectric, Then it is
  18. A.
    Fully transmitted
    B.
    Fully reflected
    C.
    Partially transmitted and partially reflected
    D.
    None of these

  19. If a positive charged pendulum is oscillating in a uniform electric field (Fig. 1). Its time period as compared to that when it was unchanged


  20. A.
    Will increase
    B.
    Will decrease
    C.
    Will not change
    D.
    Will first increase & then decrease