106. In a common emitter amplifier, the unbypassed emitter resistance provides
     

1. 1. voltage-shunt feedback

   
   
   

   2. current-series feedback

   
   
   

   3. negative-voltage feedback

   
   
   

   4. positive-current feedback

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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107. A high Q-quartz crystal exhibits series resonance at the frequency ω_s and parallel resournce at ω_p. Then
     

1. 1. ω_s is very close but less than ω_p

   
   
   

   2. ω_s << ω_p

   
   
   

   3. ω_s is very close, but greater than ω_p

   
   
   

   4. ω_s >> ω_p

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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108. If an amplifier with resistive negative feedback has two left half planes poles in its open-loop transfer function then amplifier
     

1. 1. will always be unstable at high frequencies.

   
   
   

   2. will be stable for all frequncies.

   
   
   

   3. may be unstable, depending upon the feedback factor.

   
   
   

   4. will oscillate at low frequencies.

   
   
   

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   NA

   Correct Option: B

   NA

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109. RC network shown in the given figure can provide maximum theoretical phase shift of
     
     

1. 1. 90°

   
   
   

   2. 180°

   
   
   

   3. 270°

   
   
   

   4. 360°

   
   
   

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1. View Hint View Answer Discuss in Forum

   Each section having phase shift of 60°, adding up to 180°

   Correct Option: B

   Each section having phase shift of 60°, adding up to 180°

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110. The resonant frequency of the Wein bridge oscillator of given in figure, is
     
     

1. 1. 19597 Hz

   
   
   

   2. 1592.35 Hz

   
   
   

   3. 3120.7 Hz

   
   
   

   4. 4777 Hz

   
   
   

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   f =	1	=	1	= 3120.7 Hz
   	2πRC		2π(51 × 103)(0.001 × 10-6)

   
   

   Correct Option: C

   f =	1	=	1	= 3120.7 Hz
   	2πRC		2π(51 × 103)(0.001 × 10-6)

   
   

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