Q.1

The Thevenin impedance Zth between the nodes P and Q in the following circuit is

  • 1
    5-02-21-2.png
    5-02-21-3.png
    5-02-21-4.png
Q.2

For the network shown below, the Thevenin voltage and RTH is equal to __________

  • 0 V, 58.82 Ω
  • 0 V, 96.774 Ω
  • 0 V, 3 KΩ
  • None of these
Q.3

The number of open right half plane poles of is

  • 0
  • 1
  • 2
  • 3
Q.4

The practical resonant circuit is shown in above figure. Find the expression for the resonant frequency ωo

  • None of these
Q.5

The number of open right half plane poles of is

  • 0
  • 1
  • 2
  • 3
Q.6

The function f = A ⊕ B ⊕ A ⊕ D ⊕ E ⊕ C ⊕ D ⊕ E ⊕ F ⊕ G ⊕ F ⊕ G ⊕ C ⊕ E ⊕ A ⊕ D ⊕ B ⊕ E ⊕ EB ⊕ B ⊕ B ⊕ B ⊕ D can be written as

  • A ⊕ B ⊕ D
  • A ⊕ B ⊕ E
  • A ⊕ E
  • AE
Q.7

A uniform plane magnetic wave incident normally on a plane surface of a dielectric material is reflected and the percentage of reflected power isWhat is VSWR?

  • 14
  • 1.4
  • 15
  • 13
Q.8

Using 4-bit numbers (n =if k = (0011)2 how is k expressed in 2's complement.

  • (1011)2
  • (1101)2
  • (1100)2
  • (0101)2
Q.9

A ramp input applied to a unity feedback system results insteady state error. The type number and zero frequency gain of the system are respectively.

  • 1 and 20
  • 0 and 20
  • 0 and 1/20
  • 1 and 1/20
Q.10

A square in which each (i, j)th element of matrix is equal to the negative of the conjugate complex of (j, i)th element, is called

  • Hermitian matrix
  • Skew symmetric matrix
  • Conjugate anti-symmetric matrix
  • Skew-Hermitian matrix
Q.11

When transient and steady state response require improvement; a __________ is used.

  • Lead compensator
  • Lag - Lead compensator
  • Lag compensator
  • Integrator
Q.12

Which of the following functions would have only odd powers of x in its Taylor series expansion about the point x = 0?

  • sin (x3)
  • sin (x2)
  • cos (x3)
  • cos (x2)
Q.13

The Fourier series of a real periodic function has only

  1. Cosine terms if it is even
  2. Sine terms if it is even
  3. Cosine terms if it is odd
  4. Sine terms if it is odd
Which of the above statements are correct?
  • (1) and (4)
  • (1) and (2)
  • (2) and (4)
  • (2) and (3)
Q.14

Which of the following options is the closest in meaning to the world below:
Circuitous

  • cyclic
  • indirect
  • confusing
  • crooked
Q.15

The amplitude modulated wave is given by __________ e = 25(1 + 0.7 cos 5000t - 0.3 cos 1000t) x sin 5 x 106t The amplitude of carrier and sideband frequencies in magnitudes are

  • 25, 0.7, 0.3
  • 25, 0.7, - 0.3
  • 24, 17.5, 7.5
  • 25, 8.75, 3.75
Q.16

The characteristic equation of a feedback control system is given by s3 + 5s2 + (K + 6)s + K = 0
where K > 0 is a scalar variable parameter. In the root-loci diagram of the system the asymptotes of the root-locus for large values of K meet at a point in the s-plane, whose coordinates are :

  • (- 3, 0)
  • (- 2, 0)
  • (- 1, 0)
  • (2, 0)
Q.17

Narrow band FM signal can be represented as

  • A cos (2pfct) - βA sin (2pfct) sin (2pfmt)
  • A cos (2pfmt) - βA sin (2pfct) sin (2pfmt)
  • A cos (2pfct) + βA sin (2pfct) sin (2pfmt)
  • A cos (2pfmt) + βA sin (2pfmt) sin (2pfct)
Q.18

A communication channel with AWGN operating at a signal to noise ratio SNR >> 1 and bandwidth B has capacity C1. If the SNR is doubled keeping B constant, the resulting capacity C2 is given by

  • C2 ≈ 2C1
  • C2 ≈ C1 + B
  • C2 ≈ C1 + 2B
  • C2 ≈ C1 + 0.3B
Q.19

Power gain of antenna equals directive gain in VHF and UHF range if and only if efficiency of the antenna is __________ .

  • 0.25
  • 0.5
  • 0.75
  • 1
Q.20

The equation sin (z) =has

  • no real or complex solution
  • exactly two distinct complex solutions
  • a unique solution
  • an infinite number of complex solutions
Q.21

His rather casual remarks on politics __________ his lack of seriousness about the subject.

  • masked
  • belied
  • cherish
  • conserve
Q.22

Consider a parallel plate capacitor being charged. Identify the incorrect statements

  • Energy stored in the capacitor does not enter it through the connecting wires but through the space around the wires and plates uf capacitor
  • Rate at which energy flows into this volume is equal to the integration of the Poynting vector over the boundary of the volume between the plates.
  • The Poynting vector points everywhere radially outward of the volume between the plates
  • The Poynting vector points everywhere radially into the volume between the plates.
Q.23

Consider the z-transform X(z) = 5z2 + 4z-1 +0 < |z| < ∞ The inverse transform x[n] is

  • 5δ[n + 2] + 3δ[n] + 4δ[n - 1]
  • 5δ[n - 2] + 3δ[n] + 4δ[n + 1]
  • 5u[n + 2] + 3u[n] + 4u[n - 1]
  • 5u[n - 2] + 3u[n] + 4u[n + 1]
Q.24

Input and output impedance with feedback for voltage series feedback having A = -R1 =k&ohm;, R0 =k&ohm; and feedback factor β = -0.2 will be

  • 410 k&ohm;, 2050 k&ohm;
  • 410 k&ohm;, 1.219 k&ohm;
  • ≈ 0.243 k&ohm;, 2050 k&ohm;
  • ≈ 0.24 k&ohm;, 1.219 k&ohm;
Q.25

The input 3-dB frequency is :

  • 100 Hz
  • 148 Hz
  • 100 kHz
  • None
Q.26

2's complement representation of abit number (one sign bit andmagnitude bits) is FFFF. Its magnitude in decimal representation is

  • 0
  • 1
  • 32, 767
  • 65, 535
Q.27

It is desired to design a phase shift oscillator using an FET having a gm =μSiemen, rd =kΩ and feedback circuit value of R =K. Then value of C for oscillator operation at 1 kHz and that of RD for A =to ensure oscillator action are

  • 6.4 nF, 80 K
  • 6.5 nF, 10 K
  • 6.5 pF, 10 K
  • 65 pF, 80 K
Q.28

The given characteristic polynomial s4 + s3 + 2s2 + 2s + 3 = 0 has

  • zero root in RHS of s-plane
  • one root in RHS of s-plane
  • two roots in RHS of s-plane
  • three roots in RHS of s-plane
Q.29

The resolution of a 4 bit counting ADC is 0.5 volts. For an analog input of 6.6 volts, the digital output of the ADC will be

  • 1011
  • 1101
  • 1100
  • 1110
Q.30

(11)2 + (11)3 = (11)?

  • 4
  • 5
  • 6
  • not possible
Q.31

If h1[n] = 3δ[n] + δ[n - 1], h2[n] = 2δ[n] + δ[n - 2]
h3[n] = δ[n] - 3δ[n -+ 7δ[n -+ 6δ[n - 6]
h[n] = h1[n] * h2[n] + h3[n] * h1[n] has value

  • {6, 18, 7, 4, 0, - 6, 9}
  • {9, 0, - 6, 21, 7, 6, 1}
  • {7, - 1, 3, 1, 7, 0, 6}
  • {9, - 6, 0, 1, 21, 7, 18, 6}
Q.32

The impulse response h(t) of a linear invariant continuous time system is given by h(t) = exp (- 2t) u(t), where u(t) denotes the unit step function. The output of this system to the sinusoidal input x(t) = 2cos(2t) for all time t, is

  • 0
  • 2-0.25 cos (2t - 0.125p)
  • 2-0.5 cos (2t - 0.125p)
  • 2-0.5 cos (2t - 0.25p)
Q.33

Which factor determines whether the medium is free space, lossless dielectric, lossy dielectric or good conductor?

  • Attenuation constant
  • Constitutive parameters (σ, μ, ε)
  • Loss tangent
  • Reflection coefficient
Q.34

The transfer function of a zero-order-hold system is :

  • (l/s)(l + e-sT)
  • (1/s)(1 - e-sT)
  • 1 - (l/s)e-sT
  • 1 + (1/s)e-sT
Q.35

Consider the following program segment written forbased system
LXI SP, FFFFH
MVI A, FFH
MOV BB, A
K: DCR B
PUSH HL
JNZ K
INR A
LXI H, FFCEH
CPI 20H
LHLD

The contents of accumulator is :

  • CE
  • 20
  • indeterminate
  • none of these
Q.36

An FM transmitter deliversto a load ofW when no modulation is present. The carrier is now frequency modulated by a single sinusoidal signal and the peak frequency deviation is so adjusted to make the amplitude of the second sideband is zero in the given output.
J0(=
J0(=
J0(3.= - 0.
J0(5.1)= - 0.1
J1(= 0.
J1((3.=
J1(5.= - 0.
J2(2.= 0.1
J2(3.8)= 0.
J2(5.= 0
The power in all the remaining sidebands is :

  • 84 W
  • 97.44 W
  • 100 W
  • 77.44 W
Q.37

For a integrator circuit, Ri =KΩ, CF =μF. The input is a step dc voltage as shown below. Its output will be

Q.38

System is :

  • causal
  • stable
  • non causal
  • anticausal
Q.39

In n-well CMOS fabrication substrate is:

  • heavily doped n-type
  • heavily doped p-type
  • lightly doped n-type
  • lightly doped p-type
Q.40

The reduced form of the function
Y(A, B, C, D, E, F) = ∑m(is given by:

  • A(C D + E F + D E) + D E
  • (A + C + D + E)(D + E + F)
  • (C + D + E + A)(A + D + E + F)
  • A C D + A E F + A(D ⊕ E)
Q.41

Modem warfare has changed from large scale clashes of armies to suppression of civilian populations. Chemical agents that do their work silently appear to be suited to such warfare; and regretfully, there exist, people in military establishments who think that chemical agents are useful tools for their cause, which of the following statements best sums up the meaning of the above passage:

  • Modem warfare has resulted in civil strife.
  • Chemical agents are useful in modem warfare.
  • Use of chemical agents in warfare would be undesirable.
  • People in military establishments like to use chemical agents in war.
Q.42

The transfer function of a zero-order-hold system is :

  • (l/s)(l + e-sT)
  • (1/s)(1 - e-sT)
  • 1 - (l/s)e-sT
  • 1 + (1/s)e-sT
Q.43

AkHz carrier wave modulatedatHz is applied to a resonant circuit tuned to a carrier frequency and having Q =What is the degree of modulation after transmission through this circuit?

  • 0.40
  • 0.20
  • 0.27
  • 0.54
Q.44

The input 3-dB frequency is :

  • 100 Hz
  • 148 Hz
  • 100 kHz
  • None
Q.45

2's complement representation of abit number (one sign bit andmagnitude bits) is FFFF. Its magnitude in decimal representation is

  • 0
  • 1
  • 32, 767
  • 65, 535
Q.46

System is :

  • causal
  • stable
  • non causal
  • anticausal
Q.47

For the power amplifier circuit shown below, the maximum power dissipated by both output transistor is

  • 9.66 W
  • 30.11 W
  • 31.66 W
  • 33.66 W
Q.48

The Boolean function realized by the logic circuit shown is

  • F = Σm(0, 1, 3, 5, 9, 10, 14)
  • F = Σm(2, 3, 5, 7, 8, 12, 13)
  • F = Σm(1, 2, 4, 5, 11, 14, 15)
  • F = Σm(2, 3, 5, 7, 8, 9, 12)
Q.49

Find equivalent capacitance if each capacitance is 2 F.

  • 5/12 F
  • 12/5 F
  • 6/5 F
  • 5/6 F
Q.50

Find RAB

  • 2 Ω
  • 1.5 Ω
  • 3 Ω
  • None of the above
0 h : 0 m : 1 s