61. 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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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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62. 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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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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63. 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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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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64. The semiconductor diode which can be used in switching circuits at microwave range is:
    
    

1. 1. PIN diode
      

   
   
   

   2. Tunnel diode
      

   
   
   

   3. Varactor diode
      

   
   
   

   4. Gunn diode

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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65. Which one of the following modes of transmission will not be supported by a rectangular waveguide?
    

1. 1. TE₁₀
      

   
   
   

   2. TM₁₁
      

   
   
   

   3. TE₁₁
      

   
   
   

   4. TM₁₀

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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