161. For handling large microwave power, the best medium is:
     

1. 1. Coaxial line
      
      

   
   
   

   2. Rectangular wave guide
      

   
   
   

   3. Stripline
      

   
   
   

   4. Circular wave guide

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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162. Due to curvature of earth, microwave repeaters are placed at distance of about:
     

1. 1. 10 km
      

   
   
   

   2. 50 km
      

   
   
   

   3. 150 km
      

   
   
   

   4. 250 km
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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163. Which of the following noise becomes important at microwave frequencies?
     

1. 1. Short noise
      

   
   
   

   2. Flicker noise
      

   
   
   

   3. Thermal noise
      

   
   
   

   4. Transit time noise

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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164. At microwave frequencies, the size of the antenna becomes:
     

1. 1. Very large
      

   
   
   

   2. Large
      

   
   
   

   3. Small
      
      

   
   
   

   4. Very small

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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165. Microwave frequency range extends from:
     

1. 1. 3 MHz to 30 MHz
      

   
   
   

   2. 30 MHz to 300 MHz
      

   
   
   

   3. 300 MHz to 3000 MHz
      

   
   
   

   4. 500 MHz to 30,000 MHz
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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