Q.1

A 2 μF capacitor is shunted by a 1 kΩ 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.2

Which of the following is not a conducting material?

  • Copper
  • Tungsten
  • Germanium
  • Platinum
Q.3

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.4

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

  • Microsyn
  • DC servomotor
  • AC servomotor
  • Magnetic amplifier
Q.5

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.6

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.7

The dominant mode in a rectangular wave-guide is

  • TE01
  • TM01
  • TE10
  • TM11
Q.8

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.9

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.10

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.11

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.12

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.13

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.14

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

  • 24
  • 12
  • 10
  • 8
Q.15

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

  • The number of bits
  • Monotonicity
  • Reference voltage
  • The values of resistance
Q.16

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.17

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.18

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.19

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
Q.20

8416 - 2A16 is equal to

  • 5A16
  • 4A16
  • 7A16
  • 15A16
Q.21

When number of quantization levels are two; then the average transmission power in NRZ polar signaling is __________ that of NRZ unipolar signaling

  • 1/2
  • 1/4
  • 1/8
  • none of these
Q.22

For a message signal m(t) = cos (2pfmt) and the carrier frequency fc, which of the following represents a single side band (SSB) signal?

  • cos (2pfmt) cos (2pfct)
  • cos (2pfct)
  • cos [2p(fc + fm) t]
  • [1 + cos (2pfmt) cos (2pfct)]
Q.23

Six sets of electromagnetic waves are given below :
-KHz
-KHz
3 -MHz
-KHz
-MHz
>MHz
There are designated in the following order

  • VLF, LF, MF, HF, VHF, UHF
  • LF, VLF, MF, HF, VHF, VHF
  • LF, VLF, HF, MF, VHF, UHF
  • VHF, VLF, HF, MF, LF, UHF
Q.24

If RT, Rh represent condition for reciprocity in case of transmission parameter and hybrid parameter respectively and similarly ST, Sh represent condition for symmetry in case of transmission parameter and hybrid parameter respectively then match the following :
(RT (a) A = D
(Rh (b) h12 = h21
(ST (c) AD - BC = 1
(Sh (d) h12 = - h21
(e) B = c
(f) Δh = 1

  • 1 - c 2 - d 3 - a 4 - f
  • 1 - c 2 - b 3 - e 4 - d
  • 1 - e 2 - d 3 - a 4 - b
  • 1 - e 2 - d 3 - a 4 - f
Q.25

Consider the following statements:
For a master-slave J-K flip-flop,

  1. the toggle frequency is the maximum clock frequency at which the flip-flop will toggle reliably.
  2. the data input must precede the clock triggering edge transition time by time minimum time.
  3. the data input must remain fixed for a given time after, the clock triggering edge transition time for reliable operation.
  4. propagation delay time is equal to the rise time and fall time of the data.
Which of the above statements is/are correct?
  • 1, 2 and 3
  • 1 and 2 only
  • 2 and 3 only
  • 3 and 4 only
Q.26

A series R-C circuit with R = 3 Ω and XC = 4 Ω atHz is supplied with a voltage V =+ 141.4 sint. What is the RMS value of the current flowing through the circuit?

  • 5 A
  • 10 A
  • 20 A
  • 22-36 A
Q.27

Gain of the circuit shown below is:

  • 3
    15-03-27-2.png
    15-03-27-3.png
  • -1
Q.28

Assertion (A): The expression E = - ΔV, where E is the electric field and V is the potential is not valid for time varying fields.

Reason (R): The curl of a gradient is identically zero.

  • 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.29

A single mode fibre not suffer from which type of dispersion?

  • Waveguide dispersion
  • Material dispersion
  • Intermodal dispersion
  • Polarization mode dispersion
Q.30

Which one of the following is not LED material?

  • GaAs
  • GaP
  • SiC
  • SiO2
Q.31

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.32

Which of the following meters cannot measure a.c. quantities?

  • Thermocouple
  • Hot wire
  • P.M.M.C.
  • Electrodynamometer.
Q.33

Calculate the electrostatic force of repulsion between two mica particles at a distance of 10-13 m from each other. Charge on a particle is 3.2 x 10-19 C. (relative permittivity for mica is 5)

  • 1.843 x 10-15 N
  • 9.2 x 10-2 N
  • 14.41 x 10-9 N
  • none of these
Q.34

A ring counter with 5 flip-flops will have __________ states.

  • 5
  • 10
  • 32
  • Infinite
Q.35

A negative-feedback closed-loop system is supplied to an input 5 V. The system has a forward gain of 1 and a feedback gain of 1 and a feedback gain ofWhat is the output voltage?

  • 1.0 V
  • 1.5 V
  • 2.0 V
  • 2.5 V
Q.36

There are four different algorithms AAA3 and A4 to solve, a given problem with the complexity order log(n), log(log(n)), n log and n/log(n) respectively. Which is the best algorithm?

  • A1
  • A2
  • A3
  • A4
Q.37

The amplitude of a random signal uniformly distributed between - 5 V and 5 V
If the signal to quantization noise ratio required in uniformly quantizing the signal is 4.5dB, the step size of the quantization is approximately

  • 0.0333 V
  • 0.05 V
  • 0.0667 V
  • 0.10 V
Q.38

Consider the following statements:
The conductivity of a metal has negative temperature coefficient since:

  1. The electron concentration increases with temperature.
  2. The electron mobility decreases with temperature.
  3. The electron-lattice scattering rate increases with temperature.
Which of the above statements is/are correct?
  • 1 only
  • 1 and 2
  • 2 and 3
  • 3 only
Q.39

AtGHz , the gain of a parabolic dish antenna of 1 meter diameter andefficiency is

  • 15 dB
  • 25 dB
  • 35 dB
  • 45 dB
Q.40

Which of the following statements is/are true for a good conductor of electricity?

  1. Its conductivity decreases with increasing temperature.
  2. Number of free electrons is around 1028 m-3.
  3. Its conductivity decreases with addition of impurities.
  4. It is a good conductor of heat also.
  • 1, 2, 3 and 4
  • 1 only
  • 2 and 3 only
  • 3 and 4 only
Q.41

Consider the following statements:

  1. A flip-flop is used to store 1-bit of information.
  2. Race-around condition occurs in a J-K flip-flop when both the inputs are 1.
  3. Master-slave configuration is used in flip-flops to store 2-bits of information
  4. A transparent latch consists of a D-type flip-flop.
Which of the above statements is/are correct?
  • 1 only
  • 1, 3 and 4
  • 1, 2 and 4
  • 2 and 3 only
Q.42

An electromechanical closed loop control system has the following characteristics equation :s3 + 6Ks2 + (K + 2)s = 8
where K is the forward gain of the system. The condition for closed loop stability is

  • K = 0.528
  • K = 2
  • K = 0
  • K = -2528
Q.43

Which of the following addressing modes is used in the instruction PUSH B?

  • Direct
  • Register
  • Register Indirect
  • Immediate
Q.44

Assertion (A): It is not desirable to drive a transistor into hard saturation in high speed switching circuits.

Reason (R): It may not be possible to bring it back to cutoff state, if it is driven into hard saturation.

  • 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.45

In Quine-Mclusky method of Boolean function reduction; __________ , are treated as __________ and therefore discrepancies may occur in the final solution, therefore this method is not applicable to the functions with __________ .

  • zeros, don't care conditions, zeros
  • one's, don't care conditions, one's
  • don't care conditions, zeros, don't care conditions
  • don't care conditions, don't care conditions, don't care conditions
Q.46

In TV transmission the modulation schemes for video and audio are respectively

  • FM and AM
  • FM and FM
  • AM and FM
  • AM and AM
Q.47

Assertion (A): A rectifier with inductor filter is more efficient for high load current.

Reason (R): In rectifier with inductor filter we can use a larger choke to reduce ripple, larger choke will have higher dc resistance which will result in lower dc output voltage for higher load current.

  • 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.48

The eigen values of the following matrix are

  • 3, 3 + 5j, 5 -j
  • - 6 + 5j, 3 + j, 3 - j
  • 3 + j, 3 - j, 5 + j
  • 3, - 1 + 3j, - 1 - 3j
Q.49

Hysteresis loss in a transformer working atV and at a frequency ofHz isW. When the transformer is operated atV and at a frequency ofHz, what is the hysteresis loss?

  • 50 W
  • 100 W
  • 200 W
  • 400 W
Q.50

How can the bandwidth of a control system be increased?

  • By the use of phase lead network
  • By the use of phase lag network
  • By the use of both phase-lag and phase-lead network
  • By the use of cascaded amplifiers in the system
0 h : 0 m : 1 s