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MY PROFILE Solution Report For Electrical Circuits Part 3
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Q.1 The time constant of the network shown below is
a.
b.
c.
d.
Attem pt Correct Correct Ans. d
FAQ? Have any doubt? Solution
Q.2 An RL series circuit has R = 2 Ω and L = 4 H. The charging time needed for the
inductor current to reach 40% of its steady state value is
a. 0.5 sec
b. 1 sec
c. 2 sec
d. 4 sec
Attem pt Correct Correct Ans. b
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FAQ? Have any doubt? Solution
Q.3 In the circuit given below
The values of R and L are respectively
a. R = 5 kΩ; L = 80 H
b. R = 80 kΩ; L = 5 H
c. R = 5 kΩ; L = 5 H
d. R = 2 kΩ; L = 80 H
Attem pt Correct Correct Ans. c
FAQ? Have any doubt? Solution
Q.4 A step voltage 2u(t – θ) is applied to a series RC circuit with R = 2 Ω, C = 1 F.
Assuming zero initial condition, the value of i(t) will be
a.
b.
c.
d.
Attem pt Incorrect Your Ans. b Correct Ans. d
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Q.5
The voltage across a circuit is given by V(s) = If the circuit
impedance is ⎪ Z⎪ = 2 Ω, the current in that circuit at t = 0.1 sec. is _____ A.
Attem pt Correct Correct Ans. 0.415 (0.20 0.60)
FAQ? Have any doubt? Solution
Q.6
The initial value of f(t ), if F(s) = is _________.
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Attem pt Correct Correct Ans. 1
FAQ? Have any doubt? Solution
Q.7 In the following circuit, the value of voltage V 2 is ___________ V.
Attem pt Incorrect Your Ans. 27.5 Correct Ans.
–12.31 (–13.00 –11.50)
FAQ? Have any doubt? Solution
Q.8 A DC voltage of 100 V is applied to a coil having R = 10 Ω and L = 10 H. The time
taken by the current to reach half of its final value is
a. 1 sec
b. 0.69 sec
c. 0.36 sec
d. 2 sec
Attem pt Correct Correct Ans. b
FAQ? Have any doubt? Solution
Q.9 Consider the figure shown below
If the initial voltage across the capacitor is 50 V, the expression for the voltage
across it, for t ≥ 0 will be
a.
b.
c.
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d.
Attem pt Correct Correct Ans. a
FAQ? Have any doubt? Solution
Q.10 In the circuit given below, the switch is closed at t = 0
Assume initial charge on capacitor 250 μC. The value of current i(t ) for t ≥ 0 is
a.
b.
c.
d.
Attem pt Correct Correct Ans. c
FAQ? Have any doubt? Solution
Q.11 In the figure shown below, the capacitor C is charged to a voltage V 0 (dc) and is
allowed to discharge through a resistance R while charging another capacitor of
capacitance αC. Under steady state condition, what fraction of energy originally
stored is lost?
a.
b.
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c.
d.
Attem pt Correct Correct Ans. a
FAQ? Have any doubt? Solution
Q.12 In an LC series circuit shown below, the initial current through the inductor is 5 A.
The initial voltage across the capacitor is 10 V. Assume L = 1 H and C = The
voltage across the capacitor at t ≥ 0 is
a.
b.
c.
d.
Attem pt Correct Correct Ans. c
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Q.13 In the circuit shown below, at steady state the charge accumulated in the
capacitor C(100 μF) is _________ pC.
Attem pt Correct Correct Ans. 0
FAQ? Have any doubt? Solution
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Q.14 In the following circuit
Let the initial voltages across the capacitors are V 1 (0–) = 900 mV, V 2 (0–) = 600
mV and V3(0–) = 300 mV. If the switch is closed at t = 0, the value of V3 (t) for t > 0
is _________ V
Attem pt Incorrect Your Ans. 1.045 Correct Ans. 0.52 (0.40 0.65)
FAQ? Have any doubt? Solution
Q.15 Consider the following network. The switch is opened at t = 0.
The value of the current i(t) at t = 0+ is ____________ A.
Attem pt Correct Correct Ans. 1.167 (1.00 1.50)
FAQ? Have any doubt? Solution
Q.16 In the circuit shown below, the switch has been closed for a long time. It is open
at t = 0.
The value of
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Attem pt Correct Correct Ans. 20
FAQ? Have any doubt? Solution
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