221. Which of the following statement about the ratio E/H are true?
     I. It is in the nature of an impedance
     II. It is an impedance whose value is √μ
     III. It is a plane wave
     IV. It is called intrinsic impedance of free space of value 120 π

1. 1. I and II only

   
   
   

   2. II and III only

   
   
   

   3. I, II and IV only

   
   
   

   4. II, III and IV only

   
   
   

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   NA

   Correct Option: C

   NA

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222. Match List-I with List-II and select the correct answer using the codes given below thes lists:
     

     List-I	List-II
     (a) Visible light	1. (1 − 8) m
     (b) TV, FM	2. 10-12
     (c) Microwave	3. (4 − 8) × 10-7
     (d) Gamma rays	4. 102 − 103
     (e) Broadcast	5. 10-2 − 10-3

1. 1. (a) (b) (c) (d) (e)
      1  2  4  5  3

   
   
   

   2. (a) (b) (c) (d) (e)
      2  5  1  3  4

   
   
   

   3. (a) (b) (c) (d) (e)
      4  5  1  2  3

   
   
   

   4. (a) (b) (c) (d) (e)
      3  1  5  2  4

   
   
   

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   NA

   Correct Option: D

   NA

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223. A transmission line of characteristic impedance 300 ohms is terminated by a load of (300 – j 300) ohms. The transmission coefficient is—

1. 1. 1.12 ∠76.68º

   
   
   

   2. 1.08 ∠76.68º

   
   
   

   3. 1.265 ∠–18.43º

   
   
   

   4. 0.719 ∠–18.45º

   
   
   

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   Transmission coefficient = 2 Z_L/ (Z_L + Z_C)

   Correct Option: C

   Transmission coefficient = 2 Z_L/ (Z_L + Z_C)

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224. A transmission line of characteristic impedance 300 ohms is terminated by a load of (300 – j 300) ohms. The transmission coefficient is—

1. 1. 1.12 ∠76.68º

   
   
   

   2. 1.08 ∠76.68º

   
   
   

   3. 1.265 ∠–18.43º

   
   
   

   4. 0.719 ∠–18.45º

   
   
   

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1. View Hint View Answer Discuss in Forum

   Transmission coefficient = 2 Z_L/ (Z_L + Z_C)

   Correct Option: C

   Transmission coefficient = 2 Z_L/ (Z_L + Z_C)

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225. The ratio of the radii required to give a 60 ohm coaxial line filled with PTFE of ∈_r = 2, µ_r = 1 is—

1. 1. 4.1: 1

   
   
   

   2. 3.25: 1

   
   
   

   3. 1: 1

   
   
   

   4. 7.39: 1

   
   
   

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   The equation to be used is for 2 wire line
   

   Z0 =	120	In	2D
   	√∈r		d

   
   

   Correct Option: A

   The equation to be used is for 2 wire line
   

   Z0 =	120	In	2D
   	√∈r		d

   
   

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