Q.1

Find resistance RB to bring transistor to threshold of saturation (VCB = 0), VBE = 0.7 V, a = 0.96

  • 1.5 KΩ
  • 15 KΩ
  • 10 KΩ
  • 1 KΩ
Q.2

A first order system will never be able to give a __________ response.

  1. Band pass
  2. Band reject
  3. All pass
Choose the correct option
  • 1, 2 and 3 are true
  • 1 and 3 are true, 2 is false
  • 1 and 2 are false, 3 is true
  • 1 and 2 are true, 3 is false
Q.3

A germanium diode has a reverse saturation current ofμA at 125°C and forward current of 1 mA at a forward potential of 0.8 V and the reverse potential is 0.6 V What are its dynamic forward and reverse resistance at this temperature.

  • 10.7 Ω, 70 kΩ
  • 34 Ω, 20 kΩ
  • 80 Ω, 20 kΩ
  • 800 Ω, 40 kΩ
Q.4

Find resistance RB to bring transistor to threshold of saturation (VCB = 0), VBE = 0.7 V, a = 0.96

  • 1.5 KΩ
  • 15 KΩ
  • 10 KΩ
  • 1 KΩ
Q.5

A germanium diode has a reverse saturation current ofμA at 125°C and forward current of 1 mA at a forward potential of 0.8 V and the reverse potential is 0.6 V What are its dynamic forward and reverse resistance at this temperature.

  • 10.7 Ω, 70 kΩ
  • 34 Ω, 20 kΩ
  • 80 Ω, 20 kΩ
  • 800 Ω, 40 kΩ
Q.6

The point P in the following figure is stock atThe output f will be

  • ABC
  • A
  • AB C
  • A
Q.7

In the circuit shown, the device connected to Y5 can have address in the range

  • 2000 - 20FF
  • 2D00 - 2DFF
  • 2E00 - 2EFF
  • FD00 - FDFF
Q.8

An audio signal of FM radio station is sampled at a rate ofabove the Nyquist rate. Signal is sampled inlevels and bandwidth of the signal is 4 KHz. The minimum bandwidth required to transmit this signal will be

  • 77 K bits/sec
  • 92 K bits/sec
  • 84.8 K bits/sec
  • 82.8 K bits/sec
Q.9

The point P in the following figure is stock atThe output f will be

  • ABC
  • A
  • AB C
  • A
Q.10

In the circuit shown, the device connected to Y5 can have address in the range

  • 2000 - 20FF
  • 2D00 - 2DFF
  • 2E00 - 2EFF
  • FD00 - FDFF
Q.11

In the circuit shown, the device connected to Y5 can have address in the range

  • 2000 - 20FF
  • 2D00 - 2DFF
  • 2E00 - 2EFF
  • FD00 - FDFF
Q.12

In the circuit shown, the device connected to Y5 can have address in the range

  • 2000 - 20FF
  • 2D00 - 2DFF
  • 2E00 - 2EFF
  • FD00 - FDFF
Q.13

The point P in the following figure is stock atThe output f will be

  • ABC
  • A
  • AB C
  • A
Q.14

The point P in the following figure is stock atThe output f will be

  • ABC
  • A
  • AB C
  • A
Q.15

In a microprocessor, the service routine for a certain interrupt starts from a fixed location of memory which cannot be externally set, but the interrupt can be delayed or rejected. Such an interrupt is

  • non-maskable and non-vectored
  • maskable and non-vectored
  • non-maskable and non-vectored
  • maskable and vectored
Q.16

Which of the following Boolean algebra rules is correct?

  • A . A = 1
  • A + AB = A + B
  • A + A B = A + B
  • A(A + B) = B
Q.17

Assertion (A): As the length of the resonant antenna is increased, the number of lobes increases and the direction of the major lobes is closer and closer to the direction of the diode.

Reason (R): As the length increases, the current distribution along the wire becomes more and more uniform.

  • Both A and R are individually true and R is the correct explanation of A
  • Both A and R are individually true but R is not the correct explanation of A
  • A is true but R is false
  • A is false but R is true
Q.18

Separation property of state-transition matrix is

  • φ(t - t0) = φ(t) φ(t0)
  • φ(t - t0) = φ-1(t) φ-1(t0)
  • φ(t - t0) = φ(t) φ-1(t0)
  • φ(t - t0) = φ-1(t) φ-1(t0)
Q.19

Polarization is a measure of

  • dielectric constant per unit volume
  • voltage gradient to produce electrical breakdown
  • product of charge and distance
  • excess charge density
Q.20

Which of the following cannot provide as much time interval accuracy as the oscilloscope but can capture and display eight or more signals simultaneously, something that scopes cannot do?

  • Logic analyzer
  • Digital oscilloscope
  • Frequency analyzer
  • Wave analyzer
Q.21

A DC voltage source is connected across a series R - L - C circuit. Under steady-state conditions, the applied DC voltage drops entirely across the

  • R only
  • C only
  • L only
  • R and L combination
Q.22

For the polynomial P(s) = s5 + s4 + 2s3 + 2s2 + 3s +The number of roots which lie in the right half of the s plane is :

  • 4
  • 2
  • 3
  • 1
Q.23

Noise with double-sided power spectral density of K overall frequencies is passed through a RC low pass filter with 3 dB cut-off frequency of fc. The noise power at the filter output is

  • K
  • Kfc
  • Kpfc
  • ∞
Q.24

The output of a Mealy system is 1 if there has been a pattern ofotherwiseThe minimum state for this system is :

  • 4
  • 5
  • 6
  • 7
Q.25

Consider aPLL with RT =kΩ and CT = 0.μF. What is the output frequency of the VCO?

  • 10 kHz
  • 5 kHz
  • 2.5 kHz
  • 1.25 kHz
Q.26

4 point DFT for x(n) = {-is

  • {6, 4 - 2j, 2, 2j}
  • {6, 4j, 2, - 4j}
  • {6, -1 + 3j, 4 - 4j, 4 - 2}
  • {6, 2j, 4 - 2j, - 2 + 2j}
Q.27

Which of the following transducers requires a high input impedance preamplifier for proper measurements?

  • Thermocouple
  • Piezoelectric
  • Thermistor
  • L.V.D.T
Q.28

With reference to C programming language, which of the following statements are correct?

  1. An identifier may start with an underscore.
  2. An identifier may end with an underscore.
  3. If is a valid identifier.
  4. The number of significant characters in and identifier is implementation dependent.
Select the correct answer from the codes given below:
  • 1 and 2 only
  • 2 and 3 only
  • 1, 2, 3 and 4
  • 3 and 4 only
Q.29

Assertion (A): Ideal current sources and ideal voltage sources do not exist in reality.

Reason (R): All sources have finite internal impedances.

  • Both A and R are individually true and R is the correct explanation of A
  • Both A and R are individually true but R is not the correct explanation of A
  • A is true but R is false
  • A is false but R is true
Q.30

A signal occupies a band 5 kHz tokHz. For proper error free reconstruction at what rate it should be sampled?

  • 10 kHz
  • 20 kHz
  • 5 kHz
  • (10 + 5) x 2 kHz
Q.31

By what name is the equation Δ . J = 0 frequency known?

  • Poisson's equation
  • Laplace's equation
  • Continuity equation for steady currents
  • Displacement equation
Q.32

Which of the following is true?

  • The poisson distribution is limiting case of binomial distribution.
  • In symmetrical distribution, the mean, median and mode coincide.
  • Regression is the estimation or production of unknown values of one variables from known values of another variable.
  • All are true.
Q.33

The output of a Mealy system is 1 if there has been a pattern ofotherwiseThe minimum state for this system is :

  • 4
  • 5
  • 6
  • 7
Q.34

In a conventional AM superhetrodyne receivers, the detectors employed to extract intelligence include

  • Peak detectors
  • Ratio detectors
  • PLL
  • Slope detectors
Q.35

Assertion (A): The h-parameter model of a BJT can be derived from its hybrid-p model and vice-versa.

Reason (R): The hybrid-p model has many more additional elements as compared to h-parameter model of the BJT.

  • Both A and R are individually true and R is the correct explanation of A
  • Both A and R are individually true but R is not the correct explanation of A
  • A is true but R is false
  • A is false but R is true
Q.36

Thin gate oxide in a CMOS process in preferably grown using

  • wet oxidation
  • dry oxidation
  • epitaxial deposition
  • ion implantation
Q.37

Consider the following statements, regarding an OP AMP:

  1. All types of negative feedback reduce non-linear distortion.
  2. All types of negative feedback reduce the output offset voltage.
  3. Non-inverting (current and voltage) feedback increases the input impedance.
  4. Inverting (current and voltage) feedback decreases input impedance.
Which of the above statements is/are correct?
  • 1 only
  • 2 and 3 only
  • 2 and 4 only
  • 1, 2, 3 and 4
Q.38

Which one of the following is applicable to any network-linear or non-linear, active or passive, time-varying or invariant - as long as Kirchhoff laws are not violated?

  • Tellegen's theorem
  • Reciprocity theorem
  • Maximum power transfer theorem
  • Superposition theorem
Q.39

Which of the following describe the correct properties of an emitter follower circuit?

  1. It is a voltage series feedback circuit.
  2. It is a current series feedback circuit.
  3. Its voltage gain in less than unity.
  4. Its output impedance is very low.
Select the correct answer from the codes given below:
  • 1, 3 and 4
  • 2, 3 and 4
  • 2 and 3 only
  • 2 and 4 only
Q.40

An air-filled rectangular waveguide has dimensions 8cm x 10cm . The wavelength of waveguide at frequency 3 GHz

  • 25 cm
  • 100 cm
  • 16.13 cm
  • 23.09 cm
Q.41

A surface charge density of 8 nc/m2 is present on a plane x = z. A line charge density ofnC/m is present on line x =y = 2 Find VAB for points A(and B(1)

  • 583.38 V
  • 58.338 V
  • 583.38 mV
  • 58.338 mV
Q.42

The property not valid for basic singularity function is

  • it is even signal
  • convolution of any arbitrary function x{t) and an impulse is the original function itself.
  • the sum of two impulses at same location is the impulse with the strength equal to the summation of individual strengths.
  • none of these.
Q.43

Which of the following circuits come under the class of combinational logic circuits?

  1. Full adder
  2. Full subtractor
  3. Half adder
  4. J-K flip-flop
  5. Counter
Select the correct answer from the codes given below:
  • 1 only
  • 3 and 4
  • 4 and 5
  • 1, 2 and 3
Q.44

The multiplication of two n bit numbers gives a product of length less than or equal to

  • n bits
  • 2n bits
  • 2n bits
  • 2n - 1 bits
Q.45

Consider the following statements:
The bias stability of an emitter-bias amplifier circuit improves by

  1. decreasing the value of RB
  2. increasing the value of RE
  3. decreasing the value of RB
  4. increasing the value of RB
  5. increasing the value of RC
Which of the above statements are correct?
  • 1 and 2
  • 2 and 3
  • 3 and 4
  • 4 and 5
Q.46

Which of the following statements about the matched filter in a communication receiver are correct?

  1. Its impulse response depends on the signed shape
  2. It maximizes the SNR at the detection shape.
  3. It produces ISI.
  4. It may produce phase error if synchronization is improper.
Select the correct answer from the codes given below:
  • 1 and 4 only
  • 1 and 2 only
  • 2, 3 and 4
  • 1, 2 and 4
Q.47

Which of the following devices is a 'hot-electron' diode?

  • Thermionic tube diode
  • Schottky-Barrier diode
  • Thomson-Deletion diode
  • Thermal electron diode
Q.48

Consider the following statements about a good power supply:

  1. The a.c. ripple should be high
  2. Sv, (Voltage stability factor) should be low
  3. ST, (Temperature stability factor) should be low
Which of the above statements are correct?
  • 1, 2 and 3
  • 2 only
  • 3 only
  • 2 and 3 only
Q.49

The input and output of a continuous time system are respectively denoted by x(t) and y(t) Which of the following descriptions corresponds to a causal system?

  • y(t) = x(t - 2) + x(t + 4)
  • y(t) = x(t - 4) + x(t + 1)
  • y(t) = x(t + 4) + x(t - 1)
  • y(t) = x(t + 5) + x(t + 5)
Q.50

NMOS devices have __________ switching speeds and __________ on-state resistance; as compared with PMOS devices.

  • slower, higher
  • faster, lower
  • faster, higher
  • slower, lower
0 h : 0 m : 1 s