Electric Circuits - Online Test

Q1. The equivalent capacitance of the input loop of the circuit shown is

Answer : Option A
Explaination / Solution:
No Explaination.


Q2. The RC circuit shown in the figure is

Answer : Option C
Explaination / Solution:

At ω3, capacitor acts as short circuited and circuit acts as shown in fig below

At ω0, capacitor acts as open circuited and circuit look like as shown in fig below

So frequency response of the circuit is as shown in fig and circuit is a Band pass filter.


Q3. Two series resonant filters are as shown in the figure. Let the 3-dB bandwidth of Filter 1 be B1 and that of Filter 2 be B2. the value B1/Bis

Answer : Option D
Explaination / Solution:



Q4.
For the circuit shown in the figure, the Thevenin voltage and resistance looking into X − Y are

Answer : Option D
Explaination / Solution:

Here Vth is voltage across node also. Applying nodal analysis we get


Q5. In the circuit shown, vC is 0 volts at t = 0 sec. For t > 0, the capacitor current iC(t), where t is in seconds is given by

Answer : Option A
Explaination / Solution:




Q6. In the ac network shown in the figure, the phasor voltage VA (in Volts) is

Answer : Option D
Explaination / Solution:



Q7. For the Zener diode shown in the figure, the Zener voltage at knee is 7 V, the knee current is negligible and the Zener dynamic resistance is 10 Ω. If the input voltage (Vi) range is from 10 to 16 V, the output voltage (V0) ranges from

Answer : Option C
Explaination / Solution:




Q8. In the following graph, the number of trees (P) and the number of cut-set (Q) are

Answer : Option C
Explaination / Solution:



Q9. In the following circuit, the switch S is closed at t = 0. The rate of change of current  is given by

Answer : Option B
Explaination / Solution:

Initially i(0-) = 0 therefore due to inductor i(0+) = 0. Thus all current Is will flow Iin resistor R and voltage across resistor will be IsRs. The voltage across inductor will be equal to voltage across Rs as no current flow through R.


Q10. The Thevenin equivalent impedance Zth between the nodes P and Q in the following circuit is

Answer : Option A
Explaination / Solution:

Killing all current source and voltage sources we have,