Electric Circuits - Online Test
Q1. A series RL circuit is excited at t = 0 by closing a switch as shown in the figure.
Assuming zero initial conditions, the value of 
is
is
Answer : Option D
Explaination / Solution:
Q2. In the given network V1 = 100∠0° V, V2 = 100∠ − 120° V, V3 = 100∠ + 120° V. The phasor
current 𝑖 (in Ampere) is
Answer : Option D
Explaination / Solution:
Q3. In the given network V1 = 100∠0°V, V2 = 100∠-120°V, V3 = 100∠+120°V. The phasor
current i (in Ampere) is
Answer : Option A
Explaination / Solution:
Q4. A three-winding transformer is connected to an AC voltage source as shown in the figure.
The number of turns are as follows: N1 = 100, N2 = 50. If the magnetizing current is
neglected, and the currents in two windings are 
and 
then
what is the value of the current 
in Ampere?
and then
what is the value of the current in Ampere?
Answer : Option A
Explaination / Solution:
Q5. RA and RB are the input resistances of circuits as shown below. The circuits extend infinitely in the
direction shown. Which one of the following statements is TRUE?
Answer : Option D
Explaination / Solution:
Q6. A resistance and a coil are connected in series and supplied from a single phase, 100 V, 50 Hz ac
source as shown in the figure below. The rms values of plausible voltages across the resistance (VR)
and coil (VC) respectively, in volts, are
Answer : Option D
Explaination / Solution:
Q7. A parallel plate capacitor filled with two dielectrics is shown in the figure below. If the electric field in the region A is 4 kV/cm, the electric field in the region B, in kV/cm, is
Answer : Option C
Explaination / Solution:
Q8. In the circuit shown below, the voltage and current sources are ideal. The voltage (Vout) across the
current source, in volts, is
Answer : Option D
Explaination / Solution:
Q9. The graph associated with an electrical network has 7 branches and 5 nodes. The number of independent KCL equations and the number of independent KVL equations, respectively, are
Answer : Option D
Explaination / Solution:
Q10. Two passive two-port networks are connected in cascade as shown in figure. A voltage source is
connected at port 1.
Given V1 = A1V2 + B1I2
I1 = C1V2 + D1I2
V2 = A2V3 + B2I3
A1 ,B1 ,C1 ,D1 ,A2 ,B2 ,C2 and D2 are the generalized circuit constants. If the Thevenin equivalent
circuit at port 3 consists of a voltage source VT and impedance ZT connected in series, then
Answer : Option D
Explaination / Solution:
