146. Strapping is used in cavity magnetrons to:
     

1. 1. Prevent mode jumping
      

   
   
   

   2. Ensure bunching
      

   
   
   

   3. Improve bandwidth
      

   
   
   

   4. Prevent cathode back heating

   
   
   

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   NA

   Correct Option: A

   NA

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147. In π mode operation of magnetron, the spokes due to phase focusing effect rotate at an angular velocity corresponding to:
     

1. 1. One pole/cycle
      

   
   
   

   2. Two poles/cycle
      

   
   
   

   3. Four poles/cycle
      

   
   
   

   4. Six poles/cycle

   
   
   

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   NA

   Correct Option: B

   NA

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148. The secondary cavity in a two cavity klystron is called the:
     

1. 1. Buncher cavity
      

   
   
   

   2. Catcher cavity
      

   
   
   

   3. Velocity modulation cavity
      

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: B

   NA

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149. Klystron operates on the principle of:
     

1. 1. Amplitude modulation
      

   
   
   

   2. Frequency modulation
      

   
   
   

   3. Pulse modulation
      

   
   
   

   4. Velocity modulation

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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150. Which of the following microwave tube amplifier uses an axial magnetic field and radial electric field?
     

1. 1. Coaxial magnetron
      

   
   
   

   2. CFA
      

   
   
   

   3. Travelling wave magnetron
      

   
   
   

   4. Reflex klystron

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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