The transfer characteristics for the precision rectifier circuit shown below is (assume ideal OP-AMP and practical diodes)

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

Consider the common emitter amplifier shown below with the following circuit parameters: β=100, gm=0.3861 A/V, r0= , r =259 Ω, RS=1KΩ, RB=93 KΩ, RC=250 Ω, RL=1 K, C1=  and C2=4.7 µF. The resistance seen by the source vs is

1.  258Ω

2.  1258Ω

3.  93kΩ

4.  .∞

View Answer  
4
Correct Answer :

1258Ω


Explanation :
No Explanation available for this question

Consider the common emitter amplifier shown below with the following circuit parameters: β = 100, gm = 0.3861 A/V, r0 = ∞, rπ = 259 Ω, RS = 1 KΩ, RB = 93 KΩ, RC = 250 Ω, RL= 1 KΩ, C1 = ∞ and C2 = 4.7 μF. The lower cut-off frequency due to C2 is

1.  33.9Hz

2.  27.1Hz

3.  13.6Hz

4.  16.9Hz

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4
Correct Answer :

27.1Hz


Explanation :
No Explanation available for this question

The circuit below implements a filter between the input current I and the output voltage v0. Assume that the op-amp is ideal. The filter implemented is a

1.  Low pass filter

2.  Band pass filter

3.  Band stop filter

4.  High pass filter.

View Answer  
4
Correct Answer :

High pass filter.


Explanation :
No Explanation available for this question

In the circuit shown below, capacitors C1 and C2 at very large and are shorts at the input frequency v0 is a small signal input. The gain magnitude 1 v0/vi at 10 Mard/s is

1.  Maximum

2.  Minimum

3.  Unity

4.  Zero.

View Answer  
4
Correct Answer :

Maximum


Explanation :
No Explanation available for this question

The circuit shown below is driven by a sinusoidal input vi= VP cos (t/RC). The steady output v0 is

1.  (VP/3) cos (t/RC)

2.  (VP/3) sin (t/RC)

3.  (VP/2) cos (t/RC)

4.  VP/2) sin (t/RC).

View Answer  
4
Correct Answer :

(VP/3) cos (t/RC)


Explanation :
No Explanation available for this question

For the BJT Q1 in the circuit shown below, β= , VBEon=0.7 V. The switch is initially closed. At time t=0, the switch is opened. The time t at which Q1 leaves the active region is

1.  10m

2.  25ms

3.  50ms

4.  100ms.

View Answer  
4
Correct Answer :

50ms


Explanation :
No Explanation available for this question

 The circuits shown below, assume that the voltage across a forward biased diode is 0.7 V. The thermal voltage V1=kT/q= 25mV. The small signal input is VP cos ( t) where VP=100mV. The bias current IDC  through diodes is

1.  1 mA

2.  1.28 mA

3.  1.5 mA

4.  2 mA.

View Answer  
4
Correct Answer :

1 mA


Explanation :
No Explanation available for this question

The circuits shown below, assume that the voltage across a forward biased diode is 0.7 V. The thermal voltage V1=kT/q= 25mV. The small signal input is VP cos ( t) where VP=100mV.The ac output voltage vac is

1.  0.25 cos ( t) mV

2.  1 cos ( t) mV

3.  2 cos ( t) mV

4.  22 cos ( t) mV.

View Answer  
4
Correct Answer :

2 cos ( t) mV


Explanation :
No Explanation available for this question

The circuit shown is a

1.  Low pass filter with f3dB=1/(R1 +R2 )C rad/s

2.  High pass filter with f3dB=1/R1C rad/s

3.  Low pass filter with f3dB=1/R1C rad/s

4.  High pass filter with f3dB=1/ (R1 +R2) C rad/s.

View Answer  
4
Correct Answer :

High pass filter with f3dB=1/R1C rad/s


Explanation :
No Explanation available for this question
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