Q.1

Find current i.

  • 4/5 A
  • 5/4 A
  • 1.23 A
  • 1.32 A
Q.2

The Nyquist sampling interval, for the signal sine (700t) + sine (500t) is

Q.3

Assuming the OP-AMP to be ideal, the voltage gain of the amplifier shown in figure is

Q.4

A series RLC circuit has a resonance frequency of 1 kHz and a quality factor Q =If each of R, L and C is doubled from its original value, the new Q of the circuit is

  • 25
  • 50
  • 100
  • 200
Q.5

Which of the following antennas uses a number of varying length parallel elements?

  • Helical antenna
  • Pyramidal Horn
  • Comer reflection antenna
  • Yagi-Uda antenna
Q.6

The Nyquist sampling interval, for the signal sine (700t) + sine (500t) is

Q.7

The system which is unstable is __________ .

  • h(t) = RCt . e-1 u(t)
    2-755-30-1.png
    2-755-30-2.png
    2-755-30-3.png
Q.8

VR at t < T, t = ∞

  • 500e-40x104t, 0
  • 100e-40x103t, 0
  • 100e-40x106t, 0
  • 100e-40x104t, 0
Q.9

Find current i.

  • 4/5 A
  • 5/4 A
  • 1.23 A
  • 1.32 A
Q.10

Consider a silicon p-n junction at room temperature having the following parameters:
Doping on the n-side = 1 x 1017 cm-3
Depletion width on the n-side = 0.1 μm
Depletion width on the p-side = 1.0 μm
Intrinsic carrier concentration = 1.4 x 1014F. cm-1.
Thermal voltage = 26mV
Permittivity of free space = 8.x 10-14F. cm-1.
Dielectric constant of silicon =A built in potential of the junction.

  • is 0.70V
  • is 0.76V
  • is 0.82V
  • cannot be estimated from the data given
Q.11

Which of the following capabilities are available in a Universal Shift Register?

  1. Shift left
  2. Shift right
  3. Parallel load
  4. Serial add
Select the correct answer from the codes given below:
  • 2 and 4 only
  • 1, 2 and 3
  • 1, 2 and 4
  • 1, 3 and 4
Q.12

For a Hertz dipole antenna, the Half Power Beam Width (HPBW) in the E-plane is

  • 360°
  • 180°
  • 90°
  • 45°
Q.13

Consider the following, logic diagram :

The count sequence of the above logic diagram is :

  • 0000 to 1111
  • 0000 to 1001
  • 0000 to 1010
  • 1001 to 0000
Q.14

Consider the following, logic diagram :

The count sequence of the above logic diagram is :

  • 0000 to 1111
  • 0000 to 1001
  • 0000 to 1010
  • 1001 to 0000
Q.15

Find current i.

  • 4/5 A
  • 5/4 A
  • 1.23 A
  • 1.32 A
Q.16

The system which is unstable is __________ .

  • h(t) = RCt . e-1 u(t)
    2-755-30-1.png
    2-755-30-2.png
    2-755-30-3.png
Q.17

The system which is unstable is __________ .

  • h(t) = RCt . e-1 u(t)
    2-755-30-1.png
    2-755-30-2.png
    2-755-30-3.png
Q.18

Which of the following antennas uses a number of varying length parallel elements?

  • Helical antenna
  • Pyramidal Horn
  • Comer reflection antenna
  • Yagi-Uda antenna
Q.19

The silicon sample with unit cross-sectional area shown below is in thermal equilibrium. The following information is given: T =K, electronic charge = 1.6 x 10-19C, thermal voltage = 26mV and electron mobility =cm2/V-s

The magnitude of the electric field at x = 0.5 μm is

  • 1 kV/cm
  • 5 kV/cm
  • 10 kV/cm
  • 26 kV/cm
Q.20

Laplace transform of unit triplet function is __________ .

  • 1
    3-05-67-4.png
  • s
    3-05-67-4.png
  • s2
    3-05-67-4.png
Q.21

Consider two independent random variables x and y with identical distributions. The variables X and Y take1 and2 with probabilities and respectively. What is the conditional probability P(X + Y =X - Y = 0)?

  • 0
    6-03-21-2.png
    6-03-21-3.png
  • 1
Q.22

A 2 μF capacitor is shunted by a 1 k&ohm; maintained at temperatureK. The rms noise voltage across the capacitor over the entire frequency band is:

  • 6.25 x 10-8 V
  • 5.25 x 10-6 V
  • 6.25 x 10-6 V
  • 5.25 x 10-8 V
Q.23

The input impedance of figure given below is

  • Rg(1 + Av)
    15-03-23-2.png
    15-03-23-4.png
  • Rg(1 - Av)
    15-03-23-4.png
Q.24

Consider a silicon p-n junction at room temperature having the following parameters:
Doping on the n-side = 1 x 1017 cm-3
Depletion width on the n-side = 0.1 μm
Depletion width on the p-side = 1.0 μm
Intrinsic carrier concentration = 1.4 x 1014F. cm-1.
Thermal voltage = 26mV
Permittivity of free space = 8.x 10-14F. cm-1.
Dielectric constant of silicon =A built in potential of the junction.

  • is 0.70V
  • is 0.76V
  • is 0.82V
  • cannot be estimated from the data given
Q.25

Consider the following, logic diagram :

The count sequence of the above logic diagram is :

  • 0000 to 1111
  • 0000 to 1001
  • 0000 to 1010
  • 1001 to 0000
Q.26

Laplace transform of unit triplet function is __________ .

  • 1
    3-05-67-4.png
  • s
    3-05-67-4.png
  • s2
    3-05-67-4.png
Q.27

The range of memory location in given memory interfacing scheme is

  • 0000H - 07FFH
  • F800H - FFFFH
  • 0000H - 03FFH
  • 0000H - 3FFFH
Q.28

Consider the following, logic diagram :

The count sequence of the above logic diagram is :

  • 0000 to 1111
  • 0000 to 1001
  • 0000 to 1010
  • 1001 to 0000
Q.29

Consider two independent random variables x and y with identical distributions. The variables X and Y take1 and2 with probabilities and respectively. What is the conditional probability P(X + Y =X - Y = 0)?

  • 0
    6-03-21-2.png
    6-03-21-3.png
  • 1
Q.30

For a Hertz dipole antenna, the Half Power Beam Width (HPBW) in the E-plane is

  • 360°
  • 180°
  • 90°
  • 45°
Q.31

Consider two independent random variables x and y with identical distributions. The variables X and Y take1 and2 with probabilities and respectively. What is the conditional probability P(X + Y =X - Y = 0)?

  • 0
    6-03-21-2.png
    6-03-21-3.png
  • 1
Q.32

A 2 μF capacitor is shunted by a 1 k&ohm; maintained at temperatureK. The rms noise voltage across the capacitor over the entire frequency band is:

  • 6.25 x 10-8 V
  • 5.25 x 10-6 V
  • 6.25 x 10-6 V
  • 5.25 x 10-8 V
Q.33

Which of the following is not a conducting material?

  • Copper
  • Tungsten
  • Germanium
  • Platinum
Q.34

The input impedance of figure given below is

  • Rg(1 + Av)
    15-03-23-2.png
    15-03-23-4.png
  • Rg(1 - Av)
    15-03-23-4.png
Q.35

Which of the following can be used as a tachogenerator in control systems?

  • Microsyn
  • DC servomotor
  • AC servomotor
  • Magnetic amplifier
Q.36

An audio signal is to be transmitted digitally. Which is the system best suited for good fidelity?

  • 8 bit PCM
  • 13 bit PCM
  • 32 bit PCM
  • PCM system with non-uniform quantizer
Q.37

Which of the following is true?

  • A silicon wafer heavily doped boron is a p+ substrate
  • A silicon wafer lightly doped boron is a p+ substrate
  • A silicon wafer heavily doped arsenic is a p+ substrate
  • A silicon wafer lightly doped arsenic is a p+ substrate
Q.38

The dominant mode in a rectangular wave-guide is

  • TE01
  • TM01
  • TE10
  • TM11
Q.39

The pre-emphasis in FM aids in providing extra noise immunity by

  • emphasizing only the higher frequency components
  • emphasizing the entire frequency band
  • emphasizing only the lower frequency band
  • cutting down the low frequency noise
Q.40

Consider the following statements:

  1. Acceptor level is formed very close to the conduction band.
  2. The effective mass of the free electron is same as that of a hole.
  3. The magnitude of the charge of a free electron is same as that of a hole.
  4. Addition of donor impurities adds holes to the semiconductor.
Which of the above statements are correct?
  • 1 and 3
  • 2 and 3
  • 2 and 4
  • 3 and 4
Q.41

At room temperature, a possible value for the mobility of electrons in the inversion layer of a silicon n-channel MOSFET is

  • 450 cm2/V-s
  • 1350 cm2/V-s
  • 1800 cm2/V-s
  • 3600 cm2/V-s
Q.42

The full form of the abbreviations TTL and CMOS in reference to logic families are

  • Triple Transistor Logic and Chip Metal Oxide Semiconductor
  • Tristate Transistor Logic and Chip Metal Oxide Semiconductor
  • Transistor Transistor logic and Complementary Metal Oxide Semiconductor
  • Trisate Transistor Logic and Complementary Metal Oxide Silicon
Q.43

Consider the following statements:

  1. Taking 2's complement is equivalent to sign change.
  2. In the 2's complement representation the most significant bit (MSB) is zero for a positive number.
  3. In a 4 bit binary representation of a binary number A, A + 1's complement of A = 24.
Which of the above statements are correct?
  • 1 and 2 only
  • 1 and 3 only
  • 2 and 3 only
  • 1, 2 and 3
Q.44

A standard waveguide W Rhas inside wall dimensions of a = 2.cm and b = 1.cm. What is the cut-off wavelength for TE01 mode?

  • 4.572 cm
  • 2.286 cm
  • 2.032 cm
  • 1.857 cm
Q.45

In a network with twelve circuit elements and five nodes, what is the minimum number of mesh equations?

  • 24
  • 12
  • 10
  • 8
Q.46

The resolution of a DAC depends on which of the following?

  • The number of bits
  • Monotonicity
  • Reference voltage
  • The values of resistance
Q.47

In which one of the following types of analog to digital converts the conversion time is practically independent of the amplitude of the analog signal?

  • The dual slope integrating type
  • Successive approximation type
  • Counter ramp type
  • Tracking type
Q.48

Consider the following statements:

  1. Strictly speaking C supports 1-dimensional arrays only.
  2. An array element may be an array by itself.
  3. Array elements need not occupy contiguous memory locations.
Which of the above statements is/are correct?
  • 1 only
  • 2 only
  • 1 and 2
  • 2 and 3
Q.49

Which of the following oscillators is used for the generation of high frequencies?

  • R-C phase shift oscillator
  • Wien bridge oscillator
  • L-C oscillator
  • Blocking oscillator
Q.50

Consider the following:

  1. Coupling capacitor
  2. Emitter by-pass capacitor
  3. Emitter to base diffusion capacitance of the BJT
  4. Stray capacitance of the circuit.
Which of these components in a R-C coupled amplifier control the lower cut-off frequency of the amplifier?
  • 1 and 2
  • 2 and 3
  • 3 and 4
  • l and 4
0 h : 0 m : 1 s