196. Match the following:
     1. Wave tilt
     2. Faraday rotation
     (A) Under-water propagation
     (B) Ground wave propagation
     (C) Space wave propagation
     (D) Ionospheric propagation

1. 1. 1-A, 2-C

   
   
   

   2. 1-B, 2-D

   
   
   

   3. 1-A, 2-D

   
   
   

   4. 1-B, 2-C

   
   
   

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   NA

   Correct Option: D

   NA

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197. A very lossy, λ/4 long, 50 ohms transmission line is open circuited at the load end. The input impedance measured at the other end of the line is approximately—

1. 1. 0

   
   
   

   2. ∞

   
   
   

   3. 50 ohms

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: A

   NA

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198. Copper behaves as a—

1. 1. Conductor always

   
   
   

   2. Conductor or dielectric depending on the applied electric field strength

   
   
   

   3. Conductor or dielectric depending on the frequency

   
   
   

   4. Conductor or dielectric depending on the electric current density

   
   
   

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   Copper is a well known good conductor

   Correct Option: A

   Copper is a well known good conductor

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199. An antenna, when radiating, has a highly directional radiation pattern. When the antenna is receiving, its radiation pattern—

1. 1. Is more directive

   
   
   

   2. Is less directive

   
   
   

   3. Is the same

   
   
   

   4. Exhibits no directivity at all

   
   
   

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   The radiation pattern of the antenna will be the same while radiating as well as receiving.

   Correct Option: C

   The radiation pattern of the antenna will be the same while radiating as well as receiving.

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200. The intrinsic impedance of a lossy dielectric medium is given by—

1. 1. j ω µ/ σ

   
   
   

   2. j ω ε/ µ

   
   
   

   3. √jωµ/(σ + jωε)

   
   
   

   4. √µ/ε

   
   
   

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   The intrinsic impedance of a lossy dielectric medium is given by
   

   η =	jωμ
   	σ + jωε

   Correct Option: C

   The intrinsic impedance of a lossy dielectric medium is given by
   

   η =	jωμ
   	σ + jωε

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