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Networks Analysis and Synthesis
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Networks Analysis and Synthesis
mcqs by everyone
Electric shock is
always fatal
never fatal
sometimes fatal
always disfiguring
In a series ac circuit a voltage of 20 V at 25 Hz causes a current of 0.20 A, while the same voltage at 75 Hz causes a current of 0.12
A. The circuit consists of
R and C in parallel
R and C in series
Either (a) or (b)
R and L in series
A sawtooth current wave is passed through a resistance
the waveshape of voltage across resistance will be sawtooth
the waveshape of power will be sawtooth
neither the voltage waveshape nor power wave-shape will be sawtooth
the waveshapes of voltages across resistance and power will also the sawtooth
If Fourier transform of f(t) is F(jω), then which pairs of time functions and Fourier transforms are matched f (t +
2) - ej2ω F(jω)f (-0.5t) - 2F (-2jω) - Select the answer using the following codes
1 and 3
1, 2 and 3
1 and 2
2 and 3
The internal impedance of a source is 3 + j 4 Ω. It is desired to supply maximum power to a resistiveload.
The load resistance should be
4 Ω
5 Ω
3 Ω
7 Ω
If the diameter of a wire is doubled, the current carrying capacity of the wire becomes
four times
One-fourth
Half
Twice
In figure, i(t) is a unit stepcurrent.
The steady state value of v(t) is
2 v
3 v
6 v
9 V
Two capacitors of 1 μF and 2 μF are connected in series across a 10 V dcbattery.
After the capacitors have been charged, the charges across the two capacitors will be
10 μC each
20 μC each
20 μC and 10 μC
10 μC and 20 μC
An RLC series circuit is fed form 100 V acsupply.
Inductance is 1 H and Q = 7.5. At resonance, the voltage across inductance is
100 V
about 13.5 V
750 V
1500 V
The closing of switch S1 and S2 in figure will light up
lamps L1 and L2
none of them
lamp L2 only
lamp L1 only
Steady state conditions are considered to be achieved in R-L circuits at the end of __________ time constant
One
Five
Four
Two
A two branch parallel circuit has a 20 Ω resistance and 1 H inductance in one branch and a 100 μF capacitor in the secondbranch.
It is fed from 100 V ac supply, at resonance, the input impedance of the circuit is
50 Ω
500 Ω
20 Ω
5 Ω
A choke coil of resistance R and inductance L is shunted by capacitor
C. The dynamic resistance is
C/RL
R/LC
1/RLC
L/RC
A system defined by is initially at rest, and x = u(t) sin 2t then the forced response is K sin
(2t - θ). The value of θ given by
-tan-1(2)
-tan-1(1)
A series RLC circuit has a resonance frequency of 1 kHz and a quality factor Q =100.
If each of R, L and C is doubled from its original value, the new Q of the circuit is
200
100
25
50
If operator 'a' = 1 ∠120° then
(1 +
a) =
-a
-1
A
-a2
As compared to the number of network elements in Brune synthesis, the number of network elements Bott-and Duffin in realization is
any of the above
more
less
Equal
In figure, the steady state current through 1H inductance is
6 A
5 A
3 A
Zero
A parallel RLC circuit has ω0 = 106 and Q = 30, Given C = 30 pF, the value of R is
2 MΩ
1 μΩ
1 MΩ
An inductance having XL = 5 Ω and a capacitance having XC = 5 Ω are connected in parallel across 100 V, 50 Hzsupply.
The current drawn from source is
28.28 A
Zero
20 A
40 A
Open-circuit voltage is the potential difference between two point when the impedance between these points is
capacitive
reactive
Infinity
Zero
In an ac circuit that delivers constant power at varying p.f., the current is
lowest when p.f. is lagging
lowest when p.f is unity
the same for all power factors
lowest when p.f. is leading
In a series R-L-C circuit at the resonant frequency the
current is minimum
impedance is maximum
voltage is maximum
current is maximum
In figure, the voltage V1 = 4∠0
V. The source voltage V2 is
4 - j4 volts
8 - j8 volts
8 - j16 volts
8 - j4 volts
Assertion
(A): The number of basic loops is equal to number oflinks.
Reason (R): The graph theory helps in choosing independent variables in circuit analysis
Both A and R are true and R is not the correct explanation of A
A is true but R is false
A is false but R is true
Both A and R are true and R is correct explanation of A
In the circuit shown, the steady state is reached with S open S is closed at t = 0, the current I in the 1 Ω resistor connected is to be determined at t = 0+ is given by
1
3
4/3
2
An electrical network with 8 independent nodes will have __________ nodal equations
6
8
4
7
A parallel resonant circuit can be used
to reject a small band of frequencies
Both (a) and (b)
as a high impedance
to amplify certain frequencies
The circuit in figure will act as ideal current source with respect to terminals A and B when frequency is
1 rad/sec
4 rad/sec
16 rad/sec
Substitution theorem applies to
Non linear network
Any network
linear network
Linear time invariant network
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