Electric Circuits - Online Test

Q1.
The following series RLC circuit with zero conditions is excited by a unit impulse functions 𝛿(t).

For t > 0, the output voltage vc(t) is
Answer : Option D
Explaination / Solution:



Q2.
The following series RLC circuit with zero conditions is excited by a unit impulse functions 𝛿(t).

For t > 0, the voltage across the resistor is
Answer : Option B
Explaination / Solution:



Q3.
A two-port network shown below is excited by external DC source. The voltage and the current are measured with voltmeters V1,V2 and ammeters. A1,A2 (all assumed to be ideal), as indicated

Under following conditions, the readings obtained are:

The z -parameter matrix for this network is
Answer : Option C
Explaination / Solution:

From the problem statement we have



Q4.
A two-port network shown below is excited by external DC source. The voltage and the current are measured with voltmeters V1,V2 and ammeters. A1,A2 (all assumed to be ideal), as indicated

Under following conditions, the readings obtained are:

The h-parameter matrix for this network is
Answer : Option A
Explaination / Solution:

From the problem statement we have


Q5.
In the following transistor circuit,  , and 𝛽 and all the capacitances are very large

The value of DC current IE is
Answer : Option A
Explaination / Solution:

For the given DC values the Thevenin equivalent circuit is as follows


Q6.
For the two-port network shown below, the short-circuit admittance parameter matrix is

Answer : Option A
Explaination / Solution:

Given circuit is as shown below

By writing node equation at input port

By writing node equation at output port

From (1) and (2), we have admittance matrix


Q7. For parallel RLC circuit, which one of the following statements is NOT correct ?
Answer : Option D
Explaination / Solution:

A parallel RLC circuit is shown below :
Input impedance 


Q8.
In the circuit shown, the switch S is open for a long time and is closed at t = 0. The current i (t) for t  0+is

Answer : Option A
Explaination / Solution:


When the switch S is open for a long time before t < 0, the circuit is

At t = 0, inductor current does not change simultaneously, So the circuit is

Current is resistor (AB)
i(0) = 0.75/2 = 0.375 A
Similarly for steady state the circuit is as shown below


B = 0.375 - 0.5 =- 0.125


Q9. The current I in the circuit shown is

Answer : Option A
Explaination / Solution:



Q10. In the circuit shown, the power supplied by the voltage source is

Answer : Option A
Explaination / Solution:

Applying nodal analysis

Current from voltage source is

Since current through voltage source is zero, therefore power delivered is zero.