Video Solutions to GATE 2015 ECE Question Paper - Analog Circuits (Electronic Circuit Analysis)

GATE 2015 ECE – Questions on Analog Circuits with Answers

   1.       In the circuit shown, assume OP-AMP is ideal then the 3 dB cut off frequency (in Hz) is __________

Solution:       https://www.youtube.com/watch?v=68aTpkiHA6c    

              

   2.       Consider the bode plot shown in figure. Assume that all the poles and zeros are real valued. The value of f_H – f_L (in Hz) is _____________

Solution:        https://www.youtube.com/watch?v=R95T4ztuNQo     

            

   3.       At very high frequencies, the peak output voltage V_o (in volts) is ______________

Solution:           https://www.youtube.com/watch?v=_O4UfZGA87c           

   

   4.       In the circuit shown, assume that the OP-AMP is ideal. If the gain (V_o/V_in) is –12 , then the value of R (in kΩ) is _________________

Solution:      https://www.youtube.com/watch?v=tK6-rhSk62w         

          

   5.       Negative feedback in a closed loop control system DOES NOT

a.       Reduce the overall gain

b.      Reduce  bandwidth

c.       Improve disturbance rejection

d.      Reduce sensitivity to parameter variation 

   

Solution:        https://www.youtube.com/watch?v=TFCXqD_Tu4s      

        

   6.       In the circuit shown, assume that the OP-AMP is ideal. The bridge output voltage V_o (in mV) for δ = 0.05 is _______________

Solution:          https://www.youtube.com/watch?v=j3isPwGHe_8 

              

   7.       The circuit shown in the figure has an ideal OP-AMP. The oscillation frequency and the condition to sustain the oscillations respectively are ________________

Solution:      https://www.youtube.com/watch?v=SA30jnkdunM 

                  

   8.       In the circuit shown, I₁ = 80 mA and I₂ = 4 mA. Transistors T₁ and T₂ are identical. Assume that thermal voltage is 26 mV at 27^oC. At 50^oC, the value of voltage V₁₂ = V₁ – V₂ (in mV) is _______________

Solution:       https://www.youtube.com/watch?v=vltaQSRU2KE       

           

   9.       In the circuit shown, V_o = V_OA for switch SW in position A and V_o = V_OB for switch SW in position B. Assume that the OP-AMP is ideal. The value of V_OB/V_OA is ______________

Solution:      https://www.youtube.com/watch?v=c4GkgCOXgLQ  

                 

   10.   If the circuit shown has to function as a clamping circuit, then which one of the following conditions should be satisfied for the sinusoidal signal of period T?

Solution:        https://www.youtube.com/watch?v=POqJ5VOSIdk  

               

   11.   In the bistable circuit shown, the ideal OP-AMP ahs saturation levels of ± 5 volts. The value of R1 (in kΩ) that gives a hysteresis width of 500 mV is _________________

Solution:      https://www.youtube.com/watch?v=Q6RQWfpg_6c    

               

   12.   In the ac equivalent circuit shown, the two BJTs are biased in active region and have identical parameters with β>>1. The open circuit small signal voltage gain is approximately is _________________

Solution:         https://www.youtube.com/watch?v=BPjWJXi5TZ4     

           

    13.   Assuming that the OP-AMP in the circuit shown is ideal, the output voltage V_o (inn volts) is __________

Solution:      https://www.youtube.com/watch?v=3RL9Dy8Xxco        

           

   14.   For the voltage regulator circuit shown,the input voltage (V_in) is 20 V ± 20% and the regulated output voltage (V_out) is 10 volts. Assume the OP-AMP is ideal. For a load R_L drawing 200 mA, the maximum power dissipation in Q₁ (in Watts) is _________________

        Solution:         https://www.youtube.com/watch?v=cKkJa1-Kl_U