151. Which of the following insulators are used for high frequency applications?

1. 1. Forsterite

   
   
   

   2. Bakelite

   
   
   

   3. Steatite

   
   
   

   4. All of these

   
   
   

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   NA

   Correct Option: A

   NA

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152. Bragg’s equation for X-ray diffraction from crystal planes is given by:

1. 1. d =	nλ	sin θ
      	2

   
   
   

   2. nλ = 2d sin θ

   
   
   

   3. λ =	2dn
      	sin θ

   
   
   

   4. All of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   Bragg’s equation for X-ray diffraction from crystal planes is given by
   n λ = 2d sin θ

   Correct Option: B

   Bragg’s equation for X-ray diffraction from crystal planes is given by
   n λ = 2d sin θ

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153. Transistors (with transfer resistance characteristics) were discovered by:

1. 1. W. Schockley

   
   
   

   2. Bardeen and Brattain

   
   
   

   3. Siemen

   
   
   

   4. All of the above

   
   
   

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   NA

   Correct Option: A

   NA

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154. High frequency amplifier use transformers with :

1. 1. alnico core

   
   
   

   2. ferrite core

   
   
   

   3. iron core

   
   
   

   4. none of these

   
   
   

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   High frequency amplifiers use transformers with ferrite core.

   Correct Option: B

   High frequency amplifiers use transformers with ferrite core.

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155. Audio and power amplifiers use transformers with:

1. 1. Laminated iron core

   
   
   

   2. Solid iron core

   
   
   

   3. Ferrite core

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   Audio and power amplifiers use transformers with laminated iron core.

   Correct Option: A

   Audio and power amplifiers use transformers with laminated iron core.

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