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
|
|
A A sample/hold ckt
B a rectifier/amplifier ckt
C a peak detector ckt
D an antilog amplifier ckt
Que. 40 If a input to the ckt of fig. in sine wave the output will be
I/P ________________|\
|-\
| \___________ o/p
| /
________________|+/
|/
A A half wave rectified sine wave
B A full wave rectified sine wave
C A trangular wave
D A squaer wave
|