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Networks Analysis and Synthesis
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To neglect a current source the terminals across the source are
replaced by some resistance
short-circuited
replaced by capacitance
open-circuited
A material for permanent magnet should have
High permeability
Low hysteresis loss
High retentivity
High hysteresis loss
The Z parameters Z11 and Z21 for the 2-port network in the figure
Z11 = 4/11Ω; Z21 = 4/11Ω
Z11 = - 6/11Ω; Z21 = 16/11Ω
Z11 = 6/11Ω; Z21 = - 16/11Ω
Z11 = 6/11Ω; Z21 = 4/11Ω
The graph of a network has 6 branches with 3 treebranches.
The minimum number of equations required for solution of network is
4
3
5
2
In ZRC (s) = 0 at s = ∞, the last element in first Cauer form is
R
R and C in series
C
R and C in parallel
The distributors for residential areas are
three phase three wire
three phase 4 wire
or (b)
single phase
The reading of the voltmeter V in figure should be __________ volt
10
66
60
When a source is delivering maximum power to a load through a network, the ratio of power delivered to the source power
may be 50% or less than 50%
may be 50% or more than 50%
is 50%
may be 50% or more less than 50%
An RC series circuit has R = 20 Ω and XC = 20 Ω. Then Z =
28.28 Ω
20 Ω
1 Ω
40 Ω
Figure shows a pole zero plot of I(s). The likely current response in time domain is
i (t) = e-1 - e-2t
i (t) = e-1 - 2e-2t
i (t) = e-1 - e-4t
i (t) = e-1 - e-3t
An m derived low pass filter has fc = 1000 Hz and m = 0.6. This filter will have infinite attenuation at
f = 1666.67 Hz
all frequencies above 1000 Hz
f = 1562.5 Hz
f = 1250 Hz
The pole of a reactive function
lie on jω axis or on negative real axis
lie on jω axis only
lie on negative real axis only
may lie anywhere on s plane
The resonant frequency of a series resonant circuit is
independent of inductance of the circuit
geometric mean of half power frequencies
arithmetic mean of half power frequencies
independent of capacitance of the circuit
If Ia, Ib, Ic are line currents and Ia0 is the zero sequences component of Ia then
Ia0 = Ia
Ia0 = Ia + Ib + Ic
A particular current is made up of two components 10A dc and sinusoidal current of peak value 14.14A.
The average of resultant current is
Zero
10A
24.14A
14.14A
Assertion
(A): A complicated waveform can be replaced by sum or difference of two or morewaveforms.
Reason (R): The method of superposition is applicable only to linear systems
Both A and R are true and R is 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 not the correct explanation of A
A periodic voltage v(t) = 1 + 4 sin ωt + 2 cos ωt is applied across a 1 ohmresistance.
The power dissipated is
21 W
11 W
1 W
24.5 W
If Va0, Va1, Va2 are sequence components of Va and Ia0, Ia1, Ia2 are sequence components of Ia, then total 3 phase power P is given by
P = Va0Ia0 + Va1Ia1 + Va2Ia2*
P = 3(Va0Ia0 + Va1Ia1 + Va2Ia2)
P = Va0Ia0 + Va1Ia1 + Va2Ia2
P = 3(Va0Ia0 + Va1Ia1 + Va2Ia2*)
A current of 1 A in the coil of an iron cored electromagnet causes B = 0.5T. If current is 2A, B =
0.5 T
1 T or less
1 T or more
1 t
The r.m.s. value of a half-wave rectified current is 100
A. Its value for full-wave rectification would be __________ amperes
200/p
200
141.4
40/p
1
2
26
51
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