186. A CE phase shift oscillator has three RC legs. The phase shift per leg must be:

1. 1. 30º

   
   
   

   2. 60º

   
   
   

   3. 90º

   
   
   

   4. 120º

   
   
   

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   NA

   Correct Option: B

   NA

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187. Which of the following is a non-sinusoidal oscillator?

1. 1. Multivibrator

   
   
   

   2. Relaxation oscillator using UJT

   
   
   

   3. Relaxation oscillator using tunnel diode

   
   
   

   4. Any of the above

   
   
   

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   NA

   Correct Option: D

   NA

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188. At low frequencies, the oscillators usually involve for frequency selection:

1. 1. RC components

   
   
   

   2. LC components

   
   
   

   3. RLC components

   
   
   

   4. any of these

   
   
   

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   NA

   Correct Option: A

   NA

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189. The transistor may be used as a switch so that when it is in the saturated state its on resistance is very ....... or in the cut-off state its off resistance is very........

1. 1. high, high

   
   
   

   2. low, low

   
   
   

   3. low, high

   
   
   

   4. high, low

   
   
   

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   NA

   Correct Option: C

   NA

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190. When FT is the transistors short-circuit commonemitter current gain-bandwidth, the maximum frequency of oscillations of a transistor will depend on:

1. 1. (F_t )2

   
   
   

   2. 1

      Ft

   
   
   

   3. √F_t

   
   
   

   4. 1

      √ Ft

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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