Instructions:
(a)4 marks will be allotted for correct question and 1 will be
deducted for incorrect question. (b)More than
one answer can be correct.
Que.
1
An ideal voltage source coil charge on ideal capacitor
A
is infinite time
B
exponentially
C
insatntaneously
D
none of the above
Que.
2
A real transformer with primary and secondary winding each of 2H with
dots placed at the top.the primary leakage inductance of the transformer
would be
A
1H
B
2H
C
4H
D
12H
Que.
3
The transfer function of a linear time invarient system represented by
a vector matrix differential equation X=(AX+Bu) and the output Y=(CX+Du)
is given by
A
[C(sI-A)^-1.B]
B
C(sI-A)^-1.B+D
C
B(sI-A)^-1.C
D
B(sI-A)^-1.C+D
Que.
4
For a transfer function H(s)=[P(s)/Q(s)] where P(s) and Q(s) are polynomial
in s.
A
the degree of P(s) is always greater than the degree of Q(s)
B
the degree of P(s) and Q(s) are same
C
the degree of P(s) is independent of the degree of Q(s)
D
the maximum degree of P(s) and Q(s) differ at most by one
Que.
5
Two alternating voltage quantities are represented by e1= 60 sin(wt-30degree)
and e2=10 cos(wt).then
A
e1 lags e2 by 30degree
B
e2 leads e1 by 60degree
C
e1 leads e2 by 60degree
D
e2 leads e1 by 120degree
Que.
6
A two terminal black box contains an element which can be R,L,C or M as
soon as the black box is connected to a DC voltage source a finite
nonzero current is observed to flow through the element.The element
is
A
a resistance
B
an inductance
C
a capacitance
D
a mutual inductance
Que.
7
In a R-L-C series resonant ckt at the half power points
A
the current is half of the current at response
B
the impedance is half of the impedance at response
C
the resistance is half of the resultant at response
D
none of the above
Que.
8
A sinusoidal voltage V and freq. f is connected to a series ckt at variable
resistance R anda fixed reacance X.The locus of the tip of the current
phasor I as R is varied from 0 to infinity is
A
a semicircle with a dimeter 0.1V/X
B
a straight line with a slop R/X
C
an ellipse with V/R as majour axis
D
a circle at radius R/X and origin at(0,V/2)
Que.
9
The laplace transform function of the function i(t) is I(s)=10(s+4)/[s(s+1)(s^2+4s+5)]
its final value will be
A
4/5
B
5/4
C
4
D
5
Que.
10
The resistance of a strip of a copper of a rectangular cross-section is2
ohm.A metal of resistivity twice that of copper is coated on its
upper surface to a thickness equal tothat of copper strip.the
resistance of composite strip will be
A
6 ohms
B
4/3 ohms
C
3/2 ohms
D
3/4 ohms
Que.
11
Two coils in differential connection have self inductance of 2mH and 4mH
and a mutual inductance of the combination is
A
5.7mH
B
5.85mH
C
6mH
D
6.15mH
Que.
12
The power in series R-L-C ckt will be half of that at resonance when the
magnitude of the current is equal to
A
V/2R
B
V/3R
C
V/squrt(2)R
D
2V/R
Que.
13
When compared to a first order low pass filter a second order low pass
filter has
A
lower voltage gain
B
higher voltage gain
C
faster drop in filter response
D
higher cut-off freq.
Que.
14
For V(s)=[s(s+2)]/[s(s+1)] the inital andthe final values of v(t) will
be respectively
A
1 and 1
B
2 and 2
C
2 and 1
D
1 and 2
Que.
15
The network function F(s)=[(s+2)]/[(s+1)(s+3)] represents an
A
RC impedance
B
RL impedance
C
RC impedance and an RL admittance
D
RC admittance and an RL impedance
Que.
16
In the series resourance having values of R,L and C are 25 ohm,0.01 micro
F. The freq. at which voltage across L will be maximum at
A
7.96 khz
B
8 khz
C
7.9 khz
D
8.3 khz
Que.
17
In a series RLC high Q circuit, the current peaks at a frequency
A
equal to the resonant frequency
B
grater than the resonant frequency
C
less than the resonant frequency
D
none of the above
Que.
18
driving point impedance of the ladder network shown below will be
__________ _________
o_______|inductor|_______|inductor|____________o
|________| | |________||
1H | 1H |
V(1) ___ ___ V(2)
___ 1F ___ 1F
| |
o________________|_______________|_______o
A
1/[(s^4)+3(s^2)+1]
B
1/[s(s^2+2)]
C
1/s(s^2-2)
D
none of these
Que.
19
A periodic function f(t) having a time period T,repets itself after halftime
period T/2 the fourier series of f(t) would contain
A
cosine term
B
sine term
C
odd harmonic terms only
D
even harmonic terms only
Que.
20
Relative to a given fixed tree of a network,
A
Link currents from an independent set
B
Link voltage from an independent set
C
Link currents from an independent set
D
branch voltage from an independent set
Que.
21
the step errror coefficient of a system G(s)=1/[(s+6)(s+1)] with unity
feedback is
A
1/6
B
infinity
C
0
D
1
Que.
22
The eigen values of the matrix A= |1 0| are
A
1,1
B
-1,-1
C
j,-j
D
1,-1
Que.
23
A d.c voltage source is connected across a series R-L-C ckt.Under steady
state conditions,the applided d.c. voltage drops entirely across
the
A
R only
B
L only
C
C only
D
R and L combination
Que.
24
Consider a DC voltage source connected to a series R-C ckt.when the steady-state
reaches the ratio of the energy stored in the capacitor to
the total energy supplie by the voltage source,is equal to
A
0.362
B
0.500
C
0.632
D
1000
Que.
25
The trigonometric fourier series of a periodic time function can have
only
A
cosine terms
B
sine terms
C
cosine and sine terms
D
DC and cosine terms
Que.
26
if the input of ideal comparator shown in fig. is a sinusoidal signal of 8v without any DC component then the output of the comparator has a duty cycle of
|\
input _________|+\
| |-------------output
vref =2v _______|-/
|/
A
1/2
B
1/3
C
1/6
D
q/2
Que.
27
The admittance parameter Y12 in the 2-port neywork is in fig. in
I1 20 ohm I2
o__>_______/\/\/\/\____________<___
| |
| |
/\ \ \
E1 || / 5 ohm /10 ohm /\
\ \ ||E2
/ /
| |
| |
o_____|__________________|_______
A
-0.2mho
B
0.1mho
C
-0.05mho
D
0.05mho
Que.
28
A periodic signal x(t) of period T(0) is given by
1, |t|
x(t)={0, T1<|t|
the DC component of X(t) is
A
T1/T0
B
T1/2T0
C
2T1/T0
D
T0/T1
Que.
29
If [f(t)]=F(s),then [f(t-T)]=?
A
e^sT.F(s)
B
e^-sT.F(s)
C
F(s)/1+e^sT
D
F(s)/1-e^sT
Que.
30
A linear time invarient system hasan impulse response e^2t, t>0.if the
initial conditions are zero and input is e^3t the output for t>0
is
A
e^3t-e^2t
B
e^5t
C
e^3t+e^2t
D
none of the above
Que.
31
In a linear demodulation ckt, the time constant of the RC ckt should be
A
very high
B
very low
C
adjusted for lowest modulating freq.
D
adjusted for highest modulating freq.
Que.
32
The transfer function of a tachnometer is the form
A
Ks
B
K/s
C
K/s+1
D
K/s(s+1)
Que.
33
If each branch of delta ckt has impedance/3 z, then each branch of the
equivalent wye ckt has impedance.
A
z/[(squrt)3]
B
3z
C
3/3z
D
z/3
Que.
34
The region of convergence of the z-transform of a unit step function is
A
|z|>1
B
|z|<1
C
real part of z >0
D
real part of z <0
Que.
35
The Q of a series RLC ckt is equal to
A
band width
B
voltage gain
C
impedance
D
resonent frequency
Que.
36
The short ckt natural freq. at port 1 is given by
1 1/2 2
o___/\/\/\/\___________________o
| | |
| | |
| \ |
___ / 1/3 ___
1 ___ \ ___ 2
| / |
| | |
__|____________|_________|______
A
s+5
B
2s+5=0
C
s+3/2=0
D
s+10=0
Que.
37
To find Z in thevenin's theerem
A
all independent voltage sources are short ckted and all independent
current source are open ckted
B
all independent voltage sources and dependent current source
are open ckted
C
all independent voltage are open ckted and all independent current
sources are short ckted
D
all voltage are current sources are short ckted
Que.
38
open ckt voltage is the potential differance between two points when the
impedance between these points is
A
infinity
B
rective
C
0
D
none of these
Que.
39
The op-Amp ckt shown in the figure is
______________________
| |
| |\ |
|___|-\ | |
| |-------|>|----|--------V
o____________|+/ | | 0
| |/ ideal |
| ideal diode |
v | op-Amp ___
in_|___ ___
/////// |
|
o_____o
