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Networks Analysis and Synthesis
Topics
Oscillations And Waves
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Networks Analysis and Synthesis
mcqs by everyone
A resistance and an inductance are connected in parallel and fed from 50 Hz acmains.
Each branch takes a current of 5
A. The current supplied by source is
5 A
Zero
10 Å
7.07 A
The design of wave filter is based on characteristic impedance which is
pure resistance in pass band and pure reactance in attenuation band
pure reactance in pass band and pure resistance in attenuation band
pure reactance
pure resistance
In the figure circuit, V1 = 40
V. When R is 10 Ω. When R is zero, the value of V2 will be
10 V
40 V
20 V
30 V
If resistance is 20 Ω and inductance is 2 H in a R-L series circuit, then time constant of this will be
0.001 s
100 s
10 s
0.1 s
For an RC driving point impedance function, the poles and zeros
should alternate on real axis
should alternate only on negative real axis
None of the above
should alternate on imaginary axis
The function (s +
2) (s +
4)/[(s +
1)(s +
3)]
is a reactance function
may be a reactance function or an RC function
may be RC function or an RL function
is an RC function
The minimum permissible size of aluminium cable for lighting circuit is
3.5 sq. mm
1.5 sq. mm
2.2 sq. mm
1.2 sq. mm
In figure V is ideal voltmeter having infiniteresistance.
It will read __________ volt
40
60
100
The two conductors of a single phase transmission line suspended in air carry currents in oppositedirections.
The force per unit length on each conductor varies
inversely as the square of the distance between the two conductors
directly as the current in either conductor
directly as the square of the current in either conductor
directly as the distance between the two conductors
Tellegen's theorem is applicable to
circuits with time invariant elements only
circuits with linear elements only
circuits with active or passive, linear or nonlinear and time invariant or time varying elements
circuits with passive elements only
The voltage transfer functions of two port circuits connected in cascade can be easily found from
product of individual ABCD matrices
product of voltage transfer functions of two networks
sum of z matrices
sum of h matrices
The transfer function H(s) of a system is given by Given that understeady state conditions, the sinusoidal I/P and 0/P are respectively x(t) = cos 2t and y(t) = cos
(2t + Φ), then the angle Φ will be
45°
0°
-90°
-45°
Assertion
(A): In series R-L-C circuit, the current may lead or lag the voltage depending on the value of R.Reason (R): Phase angle of an R-L series circuit is tan-1 (ωL/R)
Both A and R are true and R is not the correct explanation of A
A is false but R is true
A is true but R is false
Both A and R are true and R is correct explanation of A
A series resonant circuit is fed by a voltage having rms value
V. At resonance, the voltage across inductance VL and voltage across capacitance VC are related as
VL > VC
VL < VC
VL = VC
VL = 0.5 VC
In figure, the switch has been closed position for a longtime.
At t = 0 the switch isopened.
At t = 0+, the current ic is
I
Infinite
For the circuit in figure, fed by a unit step voltage, vc =
1
et/RC
e-t/RC
1 - e-t/RC
In following circuit, steady state is reached with S open, S is closed at t = 0, the current I at t = 0+ is given by
7 Ω
6 Ω
10 Ω
9 Ω
Assertion
(A): KCL is dual ofKVL.
Reason (R): Node is dual of mesh
Both A and R are true and R is not the correct explanation of A
A is false but R is true
Both A and R are true and R is correct explanation of A
A is true but R is false
A sinusoidal voltage has peak to peak value of 100
V. The rms value is
141.41 V
70.7 V
50 V
35.35 V
Two impedances are connected inseries.
Three voltmeters are connected, one across each impedance and one acrosscombination.
The readings of all the three areequal.
The phase angle between voltages across the two impedances is
120°
30°
60°
90°
Two capacitors of 16 μF each are connected inseries.
Another capacitor of 16 μF is connected in parallel with thiscombination.
The total capacitance will be
24 μF
48 μF
32 μF
Which one is correct option? A pure capacitor never dissipates energy, but onlystores.
Capacitor can store finite amount of energy even cunent iszero.
The current through a capacitor is zero if voltage across it
d.c.Voltage across a capacitor cannot change instantaneously since it would require an infinitecurrent.
qc(0-) = qc(0+)
1, 2, 3, 4, 5
2, 4, 3, 1
3, 4, 1, 2
5, 4, 3, 2
The current source in figure, can be replaced by
a voltage source of 16 V in series with 4 ohm resistance
a voltage source of 20 V in series with 5 ohm resistance
a voltage source of 20 V in series with 4 Ω resistance
a voltage source of 16 V in series with 5 Ω resistance
Volt is equivalent to
joule/volt
joule/ampere
joule/watt
joule/coulomb
For graph of figure, one set of fundamental cutsets would be
afde, afe, abdc
abc, cde, afe
cbfe, afe, bdf
cbd, adbe, cde
The VTH at terminals A and B is equal to
0 V
-5 V
5 V
None
If the p and T circuits in figure are equivalent, then R1, R2, R3 respectively are
6 Ω, 6 Ω, 9 Ω
9 Ω, 6 Ω, 9 Ω
9 Ω, 6 Ω, 6 Ω
6 Ω, 9 Ω, 6 Ω
A periodic voltage v(t) = 1 + 4 sin ωt + 2 cos ωt is applied across a 1 ohmresistance.
The power dissipated is
11 W
1 W
21 W
24.5 W
An RLC series circuit is excited by an ac voltage v = 1sint.
If L = 10 H, C = 0.1 F peak value of voltage across R is
1 V
indeterminate as value of R is not given
1.44 V
0.707 V
The time constant of the capacitance circuit is defined as the time during which voltage
None of the above.
falls to 36.8% of its final steady value
rises to 63.2% of its final steady value.
rises to 38.6% of its final steady value
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