171. Rochelle salts:

1. 1. are mechanically weak

   
   
   

   2. break easily

   
   
   

   3. exhibit the greatest piezoelectric activity

   
   
   

   4. all of the above

   
   
   

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   NA

   Correct Option: D

   NA

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172. Which of the following piezoelectric material can be used for very high frequencies?

1. 1. Tourmaline

   
   
   

   2. Quartz

   
   
   

   3. Rochelle salt

   
   
   

   4. All of these

   
   
   

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   NA

   Correct Option: A

   NA

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173. Which of the following does not exhibit piezoelectric effect?

1. 1. Rochelle salt

   
   
   

   2. Tourmaline

   
   
   

   3. Quartz

   
   
   

   4. Diamond

   
   
   

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   NA

   Correct Option: D

   NA

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174. The oscillator shown in fig. below is a:
     
     
     

1. 1. Miller crystal oscillator

   
   
   

   2. Shunt fed Hartley oscillator

   
   
   

   3. Electron coupled oscillator

   
   
   

   4. Tuned collector oscillator

   
   
   

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   NA

   Correct Option: D

   NA

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175. Which piezoelectric material is used in RF oscillators?

1. 1. Rochelle salt

   
   
   

   2. Quartz

   
   
   

   3. Tourmaline

   
   
   

   4. Any of these

   
   
   

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   NA

   Correct Option: B

   NA

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