NPTEL Basic Electrical Circuits Week 9 Assignment Answers 2024

NPTEL Basic Electrical Circuits Week 9 Assignment Answers 2024

1.

In the figure shown above, how much time will it take for the capacitor to charge 99.3% of its final value. (Compare it with time constant, for practical purposes we will consider as fully charged)

• 0.210 s
• 0.105 s
• 10.5 ms
• 21 ms

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Based on the above diagram, answer the following Questions.

2. What is the charge across 3 μF capacitor, just after time t=0

• 7.5 V
• 6.5 V
• 3.5 V
• 10.5 V

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3. What is equation for voltage across 5 μF capacitor at any time t

• 7.5 – 4. 5e^-t/0.048
• 4.5e^-t/0.048
• 7.5 – 4. 5e^-t/0.01125
• 4. 5e^-t/0.1125

Answer :- 

4. In the circuit given below, the switch was at position-A for a long time. At t = 0 sec, it is moved to position-B. Find the voltage across the capacitor at t = 1 sec.

• 15 V
• 20.9 V
• 30 V
• -15 V

Answer :- 

55. Find i(t) in the circuit shown below for t > 0. Assume that the switch has been closed for a long time before opening. (Multiple Options may be correct)

• i(t) = 5 A, for t ≤ 0 sec.
• i(t) = 3.1 A, for t = 0.067 sec
• i(t) = 2.5 A, for t = 0.2 sec
• 𝛕 = 1/15 sec ^-1 where 𝛕 is the time constant of the circuit.

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6. In the circuit shown below, the switch was at position A for a long time. At time t = 0 sec, the switch is moved to position B. Find the value of V₂ (t) –

Answer :- 

7. What will be the charge stored in the capacitor 2μ F, in the steady state for the below circuit. (Initially both are uncharged)

• 20 μC
• 6 μC
• 8 μC
• 10 μC

Answer :- 

8. In the below circuit, what will be the steady state voltage 𝑉0 , and what happens to the steady state voltage, if the capacitance parallel to the 3𝑘Ω resistor is doubled?

• 𝑉₀ = 2V, no change in V₀
• 𝑉₀ = 3V, V0 reduces to V₀/2
• 𝑉₀ = 2V, 𝑉0 is doubled
• 𝑉₀ = 3V, no change in V₀

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9. What will be the order of the below circuit?

• 1
• 2
• Cannot be determined
• None of the above

Answer :- 

10. In the initially relaxed RC circuit shown below,the switch is closed onto position S1 at time t = 0.After time equals one time constant of the RC circuit,the switch is moved to position S2 .Find the capacitor voltages from the options given below.

Answer :- 

11. The switch in the circuit shown below was in an open position for a long time. It is closed at time t = 0. Find i _l(t) for time t > 0.

• 6e^-2t V
• 6e^-10t V
• 12(1 – e^-2t) V
• 12(1 – e^-4t) V

Answer :- 

12. Determine the value of voltage V_c at time t = 0.5m sec .Answer the question based on the figure given below.

• 10.3 V
• 12.5 V
• 9.21 V
• 23.5 V

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