291. The value of V₀ is given by:
     
     
     

1. 1. – 3 V1 +	1	V1
      	2

   
   
   

   2. – 3 V₂

   
   
   

   3. 3	V2 –	9	V1
      2		4

   
   
   

   4. 2 V₂ – 3 V₁

   
   
   

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   Output voltage due to inverting input i.e. V₁
   

   Vo1 = – V1		3R
   		R

   
   or V_o1 = – 3 V₁
   and output voltage due to non-inverting input i.e. V₂
   

   Vo2 = VA		1 +	3R
   			R

   
   

   or Vo2 =		R	V2		(1 + 3) = 2 V2
   		R + R

   
   so V_o = V_o1 + V_o2 = – 3 V₁ + 2 V₂
   Hence alternative (D) is the correct choice.

   
   

   Correct Option: D

   Output voltage due to inverting input i.e. V₁
   

   Vo1 = – V1		3R
   		R

   
   or V_o1 = – 3 V₁
   and output voltage due to non-inverting input i.e. V₂
   

   Vo2 = VA		1 +	3R
   			R

   
   

   or Vo2 =		R	V2		(1 + 3) = 2 V2
   		R + R

   
   so V_o = V_o1 + V_o2 = – 3 V₁ + 2 V₂
   Hence alternative (D) is the correct choice.

   
   

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292. In the op amp circuit, V₀ is given by
     
     
     

1. 1. 2 V_s

   
   
   

   2. – 8 V_s

   
   
   

   3. 8 V_s

   
   
   

   4. 9 V_s

   
   
   

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1. View Hint View Answer Discuss in Forum

   V0 = Vs		1 +	8R		= 9 Vs
   			R

   Correct Option: D

   V0 = Vs		1 +	8R		= 9 Vs
   			R

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293. Active load is used in the collector of the differential amplifier of an op amplifier to:

1. 1. increase the output resistance

   
   
   

   2. increase the differential gain A_d

   
   
   

   3. handle large signals

   
   
   

   4. provide symmetry

   
   
   

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1. View Hint View Answer Discuss in Forum

   Active load in op-amp based differential amplifier is used to increase the differential gain.

   
   

   Correct Option: B

   Active load in op-amp based differential amplifier is used to increase the differential gain.

   
   

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294. The input resistance of an op-amplifier is increased by:

1. 1. use of a cascade amplifier

   
   
   

   2. use of an active load in the collector circuit

   
   
   

   3. having a constant current source in the emitter load

   
   
   

   4. the emitter follower stage

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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295. Differential amplifier can be a limiter as:

1. 1. the linear region of transfer characteristics abruptly ends for a specific value of input

   
   
   

   2. g_m is proportional to I_B

   
   
   

   3. CMRR can be made very large

   
   
   

   4. I_E can be made constant

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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