Q.1

Voltage 1 + 2 sin ωt is applied to the circuit shown below:

The capacitor C and diode D can be considered ideal. RL is very large resistance. Then the magnitude of the average voltage across RL is __________ volt.

  • 0 volt
  • 2 volts
  • -2 volts
  • -3 volts
Q.2

The Z-transform of a signal is given by its final value is __________ .

  • infinite
  • 1/4
  • zero
  • 1
Q.3

A uniform plane wave travelling in air is incident on the plane boundary between air and another dielectric medium with er =The reflection coefficient for normal incidence is

  • 0.6 ∠0°
  • 1 ∠0°
  • 0.6 ∠180°
  • 1.2 ∠180°
Q.4

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 frequency response H(ω) of this system in terms of angular frequency ω is given by H(ω)

Q.5

If (x x(10)x = (100)x; (100)x x (100)x = (10000)x then x can take value

  • 2
  • 5
  • 10
  • All
Q.6

Inmicroprocessor based system running at 3 MHz clock frequency what should be the minimum pulse width of the INTR signal, so that it is recognized successfully?

  • 0.33 μs
  • 0.666 μs
  • 5.8 μs
  • none of these
Q.7

Consider two random processes x(t) and y(t) have zero mean, and they are individually stationary. The random process is z(t) = x(t) + y(t). Now when stationary processes are uncorrelated then power spectral density of z(t) is given by

  • Sx(f) + Sy(f) + 2Sxy(f)
  • Sx(f) + Sy(f) + 2Sxy(f) + 2Syx(f)
  • Sx(f) + Sy(f)
  • Sx(f) + Sy(f) - 2Sxy(f) - 2Syx(f)
Q.8

A n-type silicon sample contains a donor concentration of Nd = 2 x 1016 cm-3. The minority carrier hole lifetime is tp0 = 5 μs. The thermal equilibrium generation rate of hole is:

  • 1.125 x 109 cm-3 s-1
  • 0.625 x 109 cm-3 s-1
  • 4.5 x 109 cm-3 s-1
  • 2.25 x 109 cm-3 s-1
Q.9

A n-type silicon sample contains a donor concentration of Nd = 2 x 1016 cm-3. The minority carrier hole lifetime is tp0 = 5 μs. The thermal equilibrium generation rate of hole is:

  • 1.125 x 109 cm-3 s-1
  • 0.625 x 109 cm-3 s-1
  • 4.5 x 109 cm-3 s-1
  • 2.25 x 109 cm-3 s-1
Q.10

If the intrinsic resistivity at 300°K is 0.ohm-m and the electron and hole mobilities at 300°K are 0.and 0.m2/volt-sec, then the intrinsic carrier concentration of Germanium is __________ .

  • 2.92 x 1019/m3
  • 2.92 x 10-19/m3
  • 1.92 x 1019/m3
  • 3.92 x 1019/m3
Q.11

The Z-transform of a signal is given by its final value is __________ .

  • infinite
  • 1/4
  • zero
  • 1
Q.12

The Z-transform of a signal is given by its final value is __________ .

  • infinite
  • 1/4
  • zero
  • 1
Q.13

A system described by the transfer function is stable. The constraints on a and K are

  • a > 0, ak < 3
  • a > 0, ak > 3
  • a < 0, ak > 3
  • a < 0, ak < 3
Q.14

What is the purpose of DMA facility in microprocessor based system?

  • To increase the speed of data transfer between the mP and the I/O devices
  • To increase the speed of data transfer between the mP and the memory
  • To increase the speed of data transfer between the memory and the I/O devices
  • To improve the reliability of the system
Q.15

If the connection of two-port is such that the transmission matrix of the overall network is the product of the transmission matrices of the individual networks, what type of connection is it?

  • Series connection
  • Cascade connection
  • Parallel connection
  • None of the above
Q.16

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 frequency response H(ω) of this system in terms of angular frequency ω is given by H(ω)

Q.17

If g(t) = e-pt2 then G(1/p) is __________ where g(t) G(f)

  • e-2/p
  • e-1/p
  • e-p
  • e2p
Q.18

If g(t) = e-pt2 then G(1/p) is __________ where g(t) G(f)

  • e-2/p
  • e-1/p
  • e-p
  • e2p
Q.19

If the intrinsic resistivity at 300°K is 0.ohm-m and the electron and hole mobilities at 300°K are 0.and 0.m2/volt-sec, then the intrinsic carrier concentration of Germanium is __________ .

  • 2.92 x 1019/m3
  • 2.92 x 10-19/m3
  • 1.92 x 1019/m3
  • 3.92 x 1019/m3
Q.20

In the design of a single mode step index optical fiber close to upper cut-off, the single mode operations is NOT preserved if

  • radius as well as operating wavelength are halved
  • radius as well as operating wavelength are doubled
  • radius is halved and operating wavelength is doubled
  • radius is doubled and operating wavelength is halved
Q.21

In the design of a single mode step index optical fiber close to upper cut-off, the single mode operations is NOT preserved if

  • radius as well as operating wavelength are halved
  • radius as well as operating wavelength are doubled
  • radius is halved and operating wavelength is doubled
  • radius is doubled and operating wavelength is halved
Q.22

A uniform plane wave travelling in air is incident on the plane boundary between air and another dielectric medium with er =The reflection coefficient for normal incidence is

  • 0.6 ∠0°
  • 1 ∠0°
  • 0.6 ∠180°
  • 1.2 ∠180°
Q.23

Voltage 1 + 2 sin ωt is applied to the circuit shown below:

The capacitor C and diode D can be considered ideal. RL is very large resistance. Then the magnitude of the average voltage across RL is __________ volt.

  • 0 volt
  • 2 volts
  • -2 volts
  • -3 volts
Q.24

A compensated wattmeter has its reading corrected for error due to which one of the following parameters?

  • Frequency
  • Friction
  • Power consumed in current coil
  • Power consumed in pressure coil
Q.25

An audio signal is band limited to 4 kHz. It is sampled at 8 kHz. What will be the spectrum of the sampled signal?

  • -4 kHz to 4 kHz
  • -8 kHz to 8 kHz
  • every 4n kHz repeating
  • every ± 8 kHz and operating as well as at zero (k integer)
Q.26

The amplitude of a random signal uniformly distributed between - 5 V and 5 V. If the positive values of the signal are uniformly quantized with a step size of 0.V, and the negative values are uniformly quantized with a step size of 0.V, the resulting signal to quantization noise is approximately

  • 46 dB
  • 43.8 dB
  • 42 dB
  • 40 dB
Q.27

Personal computer cannot be used for which one of the following?

  • Game playing
  • Weather forecasting
  • Office Automation
  • Home computing
Q.28

Consider the equation s2 + 2s + 2 + K(s +=Where do the roots of this equation break on the root loci plot?

  • -3.414
  • -2.414
  • -1.414
  • -0.414
Q.29

Consider the following statements:

  1. With increase in temperature Fermi-level tries to come in between the energy gap exactly at middle
  2. Mobility of electron in GaAs is very high compared to mobility of hole
  3. In LED, the light energy radiated due to recombination with the aid of traps.
Which of these statements are true?
  • 1 and 2
  • 1, 2 and 3
  • 2 and 3
  • 1 and 3
Q.30

Which of the following output configurations are available in a TTL gate?

  1. Open collector output
  2. Totem pole output
  3. Tristate output
Select the correct answer from the codes given below:
  • 1 only
  • 1 and 2 only
  • 2 and 3 only
  • 1, 2 and 3
Q.31

Which of the following be true for a CE transistor amplifier if the emitter resistor value is made equal to zero?

  1. Its gain will increase
  2. Its stability will increase
  3. Its gain will decrease
  4. Its stability will decrease
Select the correct answer from the codes given below
  • 1 and 2
  • 2 and 3
  • 3 and 4
  • 1 and 4
Q.32

Which of the following equations satisfy Maxwell's equations?

  • Ex = Ey = 0, Ez = cos (y - ct)
    Bx = cos(y - ct), By = Bz = 0
  • Ex = Ey = 0, Ez = cos (y- ct)
    By = cos(y - ct), Bx = Bz = 0
  • Fy = cos (y - ct), Ex = Ez = 0
    Bx = cos(y - ct), By = Bz = 0
  • None of these
Q.33

The characteristic equation of a closed loop system is (s +(s ++ K =The centroid of the asymptotes in root locus is:

  • 2.5
  • -2.5
  • 0.5
  • -0.5
Q.34

For good quality signal transmission all frequency components should have the same transmission delay, td and same phase shift-Φs. What can be said about the statement?

  • Correct
  • True from td but not for Φs
  • Not true for td but true for Φs
  • Both td and Φs are not involved in quality
Q.35

Consider the following statements a half adder.

  1. As a half subtractor also
  2. has two outputs CH = x x y and Sn = xy for two inputs x and y
  3. has two outputs CH = x + y and SH = xy for two inputs x and y
  4. is a combinational circuit
Which of the statements given above is/are correct?
  • 1, 3, 4
  • 1, 2, 4
  • 4 only
  • 2 and 3
Q.36

Conversion rate, for a successive approximation ADC which uses 2 MHz clock and 5 bit binary ladder containing 8 VV reference voltage is __________ .

  • 64516.12 conversions/sec
  • 400000 conversions/sec
  • 400000 bps
  • 2.5 bps
Q.37

The number of roots of s3 + 2s2 + 7s + 3 = 0 in the left half of the s-plane is :

  • zero
  • one
  • two
  • three
Q.38

One of a loss-less transmission line having the characteristic impedance ofΩ and length of 1cm is short-circuit. At 3 GHz, the input impedance at the other end of the transmission line is

  • 0
  • resistive
  • capacitance
  • inductive
Q.39

The following sequence represents autocorrelation of a real valued signal. The energy of real valued sequence is given by __________ x(n) = {_,_,_,_,_,_,_,_,_}

  • 2[12 + 22 + 32 + 42 + 52 + 62 + 72 + 82 + 92] + 102
  • 10
  • 102
  • 2[12 + 22 + 32 + 42 + 52 + 62 + 72 + 82 + 92 + 102]
Q.40

Consider the following two statements about the internal conditions in an n-channel MOSFET operating in the active region
SThe inversion charge decreases from source to drain
SThe channel potential increases from source to drain
Which of the following is correct?

  • Only S2 is true
  • Both S1 and S2 are false
  • Both S1 and S2 are true, but S2 is not a reason for S1
  • Both S1 and S2 are true, and S2 is a reason for S1
Q.41

  1. Hall coefficient RH is directly proportional to the charge density
  2. RH depends upon type of the semiconductor material (n - type or p - type)
  3. Hall co-efficient RH is directly proportional to hall voltage VH
From the above statements which are the false statements?
  • I only
  • II only
  • III only
  • all of the above
Q.42

In a CMOS CS amplifier, the active load is obtained by connecting a

  • p channel current mirror circuit
  • n channel transistor
  • p channel transistor
  • BJT current mirror
Q.43

The expression given is F(A, B, C, D, E, F, G, H) = Σ(255); then the __________ and __________ minterms are grouped together into dual and variable __________ is reduced using the dual

  • 243, 233, D
  • 222, 158, B
  • 243, 255, A
  • 229, 243, E
Q.44

If X = 1 in the logic equation [X + Z { Y + (Z + X Y)}] { X + Z (X + Y)} =then

  • Y = Z
  • Y = Z
  • Z = 1
  • Z = 0
Q.45

A losslessΩ transmission line is terminated+ jΩ, then voltage reflection coefficient and current reflection coefficient are

  • 062 ∠82.88, - 0.62 ∠82.88
  • 10.36 ∠11.296, - 10.36 ∠111.296
  • 0.23 ∠49.1, - 0.23 ∠ + 49.1
  • - 10.36 ∠111.296, 10.36 ∠111.296
Q.46

If the open-loop transfer function is a ratio of a numerator polynomial of degree 'm' and a denominator polynomial of degree 'n', then the integer (n - m) represents the number of:

  • breakaway points
  • unstable poles
  • separate root loci
  • asymptotes
Q.47

The electric field of 2.5 x 107 V/m can give 1 eV energy to condition electron, then in a copper block what will be the mean free path of electron?

  • 5 x 10-8 m
  • 4 x 10-7 m
  • 0.4 m
  • 0.5 m
Q.48

The magnitude plot of a composite signal x(t) = e3jt + e4jt is __________ .

  • Half wave rectified sinusoid
  • Full wave rectified sinusoid
  • Exponentially increasing sinusoid
  • Exponentially decreasing sinusoid
Q.49

The equivalent form of the logical expression (ABC + ABC + ABC + ABC + ABC) is:

  • C + (A ⊕ B)
  • (A + B + C)(A + B + C)
  • (A + B + C)(A + B + C)(A + B + C)
  • (A + B + C)(A + B + C)(A + B + C)
Q.50

Choose correct option for a stable system :

  1. Roots of the characteristic equation of the system are real and negative
  2. Area within the impulse response is finite
  • I is true, II is true
  • I is true, II is false
  • I is false, II is true
  • I is false, II is false
0 h : 0 m : 1 s