141. The main advantage of the two hole directional coupler is:
     

1. 1. Low directional coupling
      

   
   
   

   2. High SWR
      

   
   
   

   3. Poor directivity
      

   
   
   

   4. Narrow bandwidth

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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142. For a directional coupler the power is in the range of:
     

1. 1. 40 dB
      

   
   
   

   2. 30 dB
      

   
   
   

   3. 20 dB
      

   
   
   

   4. 10 dB

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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143. Wave guides are pressurised above normal atmospheric pressure for:
     

1. 1. Increasing their power handling capacity
      

   
   
   

   2. Improving the conductivity of their walls
      

   
   
   

   3. Preventing higher order modes from propagating
      

   
   
   

   4. Varying the wave impedence
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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144. Which one of the following is a transferred electron device?
     

1. 1. Baritt diode
      

   
   
   

   2. IMPATT diode
      

   
   
   

   3. Gunn diode
      

   
   
   

   4. Step recovery diode

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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145. In TWT, attenuator is put:
     

1. 1. At the beginning
      

   
   
   

   2. In the middle
      

   
   
   

   3. At the end
      

   
   
   

   4. Anywhere

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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