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MCQs

Total Questions : 660 | Page 65 of 66 pages
Question 641. Which of the following are not vector functions in Electromagnetics?
  1.    Gradient
  2.    Divergence
  3.    Curl
  4.    There is no non- vector functions in Electromagnetics
 Discuss Question
Answer: Option D. -> There is no non- vector functions in Electromagnetics


Since all the coordinates in electromagnetic are space coordinates, direction and magnitude both are important. Thus all functions are vector only.


Question 642. 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
  1.    2 Z1/(Z1+ Z2)
  2.    Z1/(Z1+ Z2)
  3.    2 Z2/(Z1+ Z2)
  4.    Z2/(Z1+ Z2)
 Discuss Question
Answer: Option A. -> 2 Z1/(Z1+ Z2)


2 Z1/(Z1+ Z2)


Question 643. Poynting vector gives
  1.    Rate of energy flow
  2.    Direction of polarization
  3.    Intensity of electric field
  4.    Intensity of magnetic field
 Discuss Question
Answer: Option A. -> Rate of energy flow


Rate of energy flow


Question 644. Which one of the following conditions will not guarantee a distortionless Transmission Line
  1.    R = 0 , G = 0
  2.    LG = RC
  3.    R >> ω L , G >> ω C
  4.    R
 Discuss Question
Answer: Option C. -> R >> ω L , G >> ω C


R >> ω L , G >> ω C


Question 645. Which of the following is the Poisson's equation
  1.    âˆ‡2 V = - ρ/ ∈
  2.    âˆ‡2 V = - 4πσ
  3.    âˆ‡2 V = - 4πρ
  4.    âˆ‡2 V = 0
 Discuss Question
Answer: Option A. -> ∇2 V = - ρ/ ∈


∇2 V = - ρ/ ∈


Question 646. 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
  1.    âˆˆ1 > ∈2 and θi < θc
  2.    âˆˆ1 < ∈2 and θi > θc
  3.    âˆˆ1 < ∈2 and θi < θc
  4.    âˆˆ1 > ∈2 and θi > θc
 Discuss Question
Answer: Option D. -> ∈1 > ∈2 and θi > θc


∈1 > ∈2 and θi > θc


Question 647. When the separation between two charges increases, the electric potential energy of charges
  1.    Increases
  2.    Decreases
  3.    Remains the same
  4.    May increase or decrease
 Discuss Question
Answer: Option B. -> Decreases


Decreases


Question 648. A hollow rectangular waveguide acts as a
________
  1.    High pass filter
  2.    Low pass filter
  3.    Band pass filter
  4.    Low frequency radiator
 Discuss Question
Answer: Option A. -> High pass filter


High pass filter


Question 649. For which of the following statement does the Divergence theorem is applicable
  1.    Static field only
  2.    Time varying fields only
  3.    Both static & time varying fields
  4.    Electric fields only
 Discuss Question
Answer: Option C. -> Both static & time varying fields


Both static & time varying fields


Question 650. If a current element is z-directed, Then vector magnetic potential is
  1.    X "“ directed
  2.    Y- directed
  3.    Î¸ - directed
  4.    Z "“ directed
 Discuss Question
Answer: Option C. -> θ - directed


Z “ directed


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