Electric Circuits - Online Test
Q1. A voltage 1000sinωt Volts is applied across YZ. Assuming ideal diodes, the voltage measured
across WX in Volts is 
Answer : Option D
Explaination / Solution:
No Explaination.
Q2. Three capacitors C1, C2, and C3, whose values are 10µF, 5µF, and 2µF respectively, have
breakdown voltages of 10V, 5V, and 2V respectively. For the interconnection shown, the maximum
safe voltage in Volts that can be applied across the combination and the corresponding total charge
in µC stored in the effective capacitance across the terminals are respectively
Answer : Option C
Explaination / Solution:
No Explaination.
Q3. 
In the circuit shown below, if the source voltage Vs = 100∠53.13° V then the Thevenin’s equivalent
voltage in Volts as seen by the load resistance RL is
Answer : Option C
Explaination / Solution:
No Explaination.
Q4. In the circuit shown below, the knee current of the ideal Zener diode is 10 mA. To maintain 5 V
across RL, the minimum value of RL in Ω and the minimum power rating of the Zener diode in mW
respectively are
Answer : Option B
Explaination / Solution:
No Explaination.
Q5. The switch SW shown in the circuit is kept at position ‘1’ for a long duration.
At
t
= 0+, the switch is moved to position ‘2’. Assuming |Vo2| > |Vo1|, the voltage vc(t) across the capacitor is
Answer : Option D
Explaination / Solution:
Q6. 
A parallel plate capacitor consisting two dielectric materials is shown in the figure. The middle dielectric slab is place symmetrically with respect to the plates.
If the potential difference between one of the plates and the nearest surface of dielectric
interface is 2Volts, then the ratio ε1:ε2 is
Answer : Option C
Explaination / Solution:
Q7. 
Assuming an ideal transformer,. The Thevenin’s equivalent voltage and impedance as seen from the terminals x and y for the circuit in figure are
Answer : Option A
Explaination / Solution:
Q8. The voltage across the capacitor, as sown in the figure, is expressed as 
The value of A1 and A2 respectively, are
Answer : Option A
Explaination / Solution:
Q9. Suppose that resistors R1 and R2 are connected in parallel to give an equivalent resistor R. If
resistors R1 and R2 have tolerance of 1% each., the equivalent resistor R for resistors R1 =
300Ω and R2 = 200Ω will have tolerance of
Answer : Option B
Explaination / Solution:
Q10. In the following circuit, the input voltage Vin is 100
sin(100πt). For 100πRC = 50, the
average voltages across R (in volts) under steady-state is nearest to
Answer : Option C
Explaination / Solution:
Given circuit is voltage doubler
Vm = Voltage across each capacitor = 100V
Voltage across two capacitors (in steady state)
= 2Vm = 200V
