36. The absorption of radio waves by the atmosphere depends on

1. 1. Their distance from the transmitter

   
   
   

   2. Their polarisation of the wave

   
   
   

   3. Their frequency

   
   
   

   4. The polarisation of the atmosphere

   
   
   

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   NA

   Correct Option: C

   NA

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37. An oscillator is nothing but an amplifier with

1. 1. Positive feedback

   
   
   

   2. Large gain

   
   
   

   3. No feedback

   
   
   

   4. Negative feedback

   
   
   

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   NA

   Correct Option: A

   NA

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38. The space waves which are affected seriously by atmospheric conditions are

1. 1. MF0

   
   
   

   2. HF

   
   
   

   3. VHF

   
   
   

   4. UHF

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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39. Which of the following is not transducer ?

1. 1. Loudspeaker

   
   
   

   2. Amplifier

   
   
   

   3. Microphone

   
   
   

   4. All of these

   
   
   

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   NA

   Correct Option: B

   NA

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40. Radio wave of constant amplitude can be generated with

1. 1. Filter

   
   
   

   2. Rectifier

   
   
   

   3. FET

   
   
   

   4. Oscillator

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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