Q.1

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.2

The Table given below is the mark obtained by 2 students in 8 different subjects.

The regression line of y on x is:

  • y + 0.57x = 9.7558
  • y - 0.57x = 9.758
  • 033y + x = 6.335
  • 0.33y - x = 6.335
Q.3

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.4

Consider differential equation with the initial condition y(=Using Euler's first order method with a step size of 0.the value of y(0.is

  • 0.01
  • 0.031
  • 0.0631
  • 0.1
Q.5

If x(t) = 0 for t < 0 and x(t) contains no impulse or higher order singularities at t =then

Q.6

What is the major cause of creeping in an energy-meter?

  • Over compensation for friction
  • Mechanical vibrations
  • Excessive voltage across the potential coil
  • Stray magnetic fields
Q.7

Consider differential equation with the initial condition y(=Using Euler's first order method with a step size of 0.the value of y(0.is

  • 0.01
  • 0.031
  • 0.0631
  • 0.1
Q.8

A single turn loop is situated in air, with a uniform magnetic field normal to its plane. The area of the loop is 5 m2 and the rate of change of flux density is 2 Wb/m2/s. What is the emf appearing at the terminals of the loop?

  • -5 V
  • -2 V
  • -0.4 V
  • 0 V
Q.9

Which among the following waveforms can be reconstructed from its samples without distortion?

  • 1 and 2
  • 2 and 3
  • 1 and 3
  • Only 2
Q.10

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.11

If x(t) = 0 for t < 0 and x(t) contains no impulse or higher order singularities at t =then

Q.12

What is the period of the sinusoidal signal x(n) = 5 cos [0.2 pn]?

  • 10
  • 5
  • 1
  • 0
Q.13

Consider differential equation with the initial condition y(=Using Euler's first order method with a step size of 0.the value of y(0.is

  • 0.01
  • 0.031
  • 0.0631
  • 0.1
Q.14

If x(t) = 0 for t < 0 and x(t) contains no impulse or higher order singularities at t =then

Q.15

What is the period of the sinusoidal signal x(n) = 5 cos [0.2 pn]?

  • 10
  • 5
  • 1
  • 0
Q.16

The output corresponding to the figure shown below is :

Q.17

A signal x1(t) and x2(t) constitute the real and imaginary parts respectively of a complex valued signal x(t). What form of waveform does x(t) possess?

  • Real symmetric
  • Complex symmetric
  • Asymmetric
  • Conjugate symmetric
Q.18

An antenna array comprises of two dipoles that are separated by wavelength. The dipoles are fed by currents of the same magnitude andin phase. The array factor is:

  • 2 cos - 2 sin
  • 2 cos + 2 sin
  • 2 cos
  • 2 sin
Q.19

The output corresponding to the figure shown below is :

Q.20

Consider the following

  1. Maximum energy of electrons liberated photoelectrically is independent of light intensity
  2. Maximum energy of electrons liberated photoelectrically varies nonlinearly with frequency of incident light.
  • (1) is true and (2) is false
  • (1) and (2) both are true
  • (1) is false and (2) is true
  • (1) and (2) both are false
Q.21

Radiation resistance of an antenna is&ohm; and loss resistance is 6 &ohm;. If antenna has power gain ofthen directivity is:

  • 9
  • 11.11
  • data not sufficient
  • 10
Q.22

When phase-lag compensation is used in a system, then gain cross over frequency, bandwidth and undamped frequency are respectively

  • Increased, Increased, Increased
  • Increased, Increased, Decreased
  • Increased, Decreased, Decreased
  • Decreased, Decreased, Decreased
Q.23

The antenna current of an AM transmitter is 8 A, when only the carrier is sent, but it increases to 8.A when the carrier is modulated by a single sine wave. Determine the antenna current when the percent of modulation changes to 0.8

  • 9.19 A
  • 9.91 A
  • 10.56 A
  • 8.61 A
Q.24

The equivalent form of the logical expression ABC + A BC + ABC + ABC + AB C 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.25

The gradient of any scalar field always yields __________ .

  • a solenoidal field
  • a conservative field
  • an irrotational field
  • none of these
Q.26

The specific gravity of tungsten is 13.8 and its atomic weight is 184.0 Assume that there are two free elements per atom. Then the Fermi level or characteristic energy for the crystal in eV will be

  • 8.95 eV
  • -8.95 eV
  • 7.326 eV
  • -7.326 eV
Q.27

For a given voltage, four heating coils will produce maximum heat when connected

  • all in parallel
  • all in series
  • with two parallel pairs in series
  • one pair in parallel with the other two in series
Q.28

What are the values of Emax and Emin displayed on the oscilloscope, when a 1 kV P-P carries is modulated to 50%?

  • 2 kV, 0.5 kV
  • 1 kV, 0.5 kV
  • 0.75 kV, 0.25 kV
  • 0.5 kV, 1.5 kV
Q.29

The analog signal given below is sampled atsamples per second. m(t) = 2 sinpt + 3 sinpt + 4 sinpt + 5 sinpt + 6 sinpt + 7 sinpt. The folding (maximum) frequency is __________ .

  • 300 Hz
  • 360 Hz
  • 600 Hz
  • 480 Hz
Q.30

Consider the amplitude modulated (AM) signal Ac cos ωct + 2 cos ωmt cos ωct For demodulating the signal using envelope detector, the minimum value of Ac should be

  • 2
  • 1
  • 0.5
  • 0
Q.31

A noiseless 3 KHz channel can transmit binary at the rate __________ .

  • 12000 bps
  • 10000 bps
  • 6000 bps
  • 3000 bps
Q.32

In a flash type ADC, employingcomparators resolution withvolts reference; is expected to be :

  • 0.625 V
  • 0.656 V
  • 0.525 V
  • insufficient data
Q.33

An air-filled rectangular waveguide has dimensions 8cm x 10cm . The phase velocity of guided wave at frequency of 3 GHz for TE10 mode is

  • 1.5 x 108 m/s
  • 5.5 x 108 m/s
  • 3.46 x 108 m/s
  • 0.18 x 107 m/s
Q.34

Denominator polynomial of a transfer function of certain network is:
s3 + s2 + 2s +
Then the network is:

  • stable
  • oscillatory
  • unstable
  • depends on numerator polynomial
Q.35

A TV picture is to be transmitted over a channel of 6 MHz bandwidth at adB S/N ratio. The capacity of the channel is

  • 50 Mbps
  • 100 Mbps
  • 36 Mbps
  • 72 Mbps
Q.36

An 8 level encoding scheme is used in a PCM system ofkHz channel BW. The channel capacity is

  • 80 kbps
  • 60 kbps
  • 30 kbps
  • 18 kbps
Q.37

As the temperature increases the mobility of electrons __________ .

  • decreases because the number of carries increases with increased collisions
  • increases because the number of carries decreases with decreased collisions
  • remains same
  • none of the above
Q.38

In a 4 bit weighted resistor D/A converter, the resistor value corresponding to LSB iskΩ. The resistor value corresponding to MSB will be

  • 32 KΩ
  • 16 KΩ
  • 8 KΩ
  • 4 KΩ
Q.39

If the characteristic equation of a closed loop system is s2 + 2s +then the system is :

  • over damped
  • critically damped
  • under damped
  • undamped
Q.40

As the temperature increases the mobility of electrons __________ .

  • decreases because the number of carries increases with increased collisions
  • increases because the number of carries decreases with decreased collisions
  • remains same
  • none of the above
Q.41

The current i(t) through aΩ resistor in series with an inductance is given by i(t) = 3 + 4 sin (100t + 45°) + 4 sin (300t + 60°) Amperes. The RMS value of the current and the power dissipated in the circuit are

  • 41 A, 410 W respectively
  • 35 A, 350 W respectively
  • 5 A, 250 W respectively
  • 11 A, 1210 W respectively
Q.42

For static electric and magnetic fields in an homogenous source-free medium, which of the following represents the correct form of Maxwell's equations?

  • Δ.E = 0
    Δ x B = 0
  • Δ.E = 0
    Δ.B = 0
  • Δ x E = 0
    Δ x B = 0
  • Δ x E = 0
    Δ.B = 0
Q.43

Given digits4 how many distinct 4 digit numbers greater thancan be formed?

  • 50
  • 51
  • 52
  • 54
Q.44

Calculate the stability factor and change in Ic from 25°C to 100°C for, β =RB/RE =ΔICO = 19.9 nA for emitter bias configuration

  • 42.553, 0.85 μF
  • 40.91, 0.58 μF
  • 38.53, 0.85 μF
  • 41.10, 0.39 μF
Q.45

In amplitude modulation, carrier signals A cos ωt has its amplitude A modulated in proportion with message bearing (low frequency) signal m(t). The magnitude of m(t) is chosen to be __________ .

  • less than 1
  • less than or equal to 1
  • more than 1
  • none of these
Q.46

Assertion (A): Conductors do not permit propagation of waves more than a short distance into the conductor at microwave frequencies.

Reason (R): The relaxation time constant for conductors is much small than the period of centimetric EM wave.

  • Both (A) and (R) are true and (R) is the correct explanation of (A)
  • Both (A) and (R) are 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.47

An antisymmetric filter having odd number of coefficient may have a performance as

  • low pass
  • high pass
  • band pass
  • all pass
Q.48

For real values of x, the minimum value of the function f(x) exp (x) + exp (- x) is

  • 2
  • 1
  • 0.5
  • 0
Q.49

Find Vx Vy Vz

  • Vx = -6 Vy = 3 Vz = -3
  • Vx = -6 Vy = -3 Vz = 1
  • Vx = 6 Vy = 3 Vz = 3
  • Vx = 6 Vy = 1 Vz = 3
Q.50

An air-filled rectangular waveguide has dimensions 8cm x 10cm . The phase velocity of guided wave at frequency of 3 GHz for TE10 mode is

  • 1.5 x 108 m/s
  • 5.5 x 108 m/s
  • 3.46 x 108 m/s
  • 0.18 x 107 m/s
0 h : 0 m : 1 s