Q.1

A generator ofΩ internal impedance and operating at 1 GHz feeds aΩ load via a coaxial line of characteristic impedanceΩ. The VSWR on the feed line is

  • 0.5
  • 1.5
  • 2.5
  • 1.75
Q.2

Inmicroprocessor system, can an input and output port have same port address?

  • Yes
  • No
  • Insufficient data
  • None of these
Q.3

A control system is as shown in given figure The maximum value of gain K for which the system is stable is

  • more than 5
  • equal to 5
  • less than 1
  • less than 5
Q.4

AkHz carrier wave modulatedatHz is applied to a resonant circuit tuned to a carrier frequency and having Q =What is the degree of modulation after passing the wave through this circuit?

  • 0.4
  • 0.2
  • 0.27
  • 0.554
Q.5

In the circuit s closed for a long time and steady state is reached. s is opened at t = 0+ Determine current through resistor.

  • A
  • A
  • - A
  • - A
Q.6

A lossless transmission line with air dielectric is 6 m long. What is the line length atMHz?

  • 1 wavelength long
  • 0.5 wavelength long
  • 0.6 wavelength long
  • 0.25 wavelength long
Q.7

Consider a Binary Symmetric Channel (BSC) with probability of error being p. To transmit a bit, saywe transmit a sequence of three 1 s. The receiver will interpret the received sequence to represent 1 if at least two bits areThe probability that the transmitted bit will be received in error is

  • p3 + 3p2 (1 - p)
  • p3
  • (1 - p)3
  • p3 + p2 (1 -p)
Q.8

The probability density function of a random variable x is as shown.

The mean of the distribution is:

Q.9

For a Gaussian process, auto-correlation also implies

  • statistical dependence
  • statistical independence
  • ergodic process
  • none of the above
Q.10

A short vertical grounded antenna is required to radiate at 1 MHz. The effective height of the antenna is 302 m. The calculated value of radiation resistance is

  • 1.58 Ω
  • 158 Ω
  • 15.8 Ω
  • none
Q.11

In a synchro error detector, the output voltage is proportional to [ω(t)]n, where ω(t) is the rotor velocity and n equals :

  • -2
  • -1
  • 1
  • 2
Q.12

In a number system with radix r, the decimal value ofis equal to 4r. The decimal values ofand r respective are equal to

  • 20, 5
  • 16, 4
  • 13, 3
  • 8, 2
Q.13

5 skilled workers can build a wall indays; 8 semi-skilled worker can build a wall in 25days;unskilled workers can build a wall indays, If a team has 2 killed, 6 semi-skilled and 5 unskilled workers, how long will it take to build the wall?

  • 20 days
  • 18 days
  • 16 days
  • 15 days
Q.14

In the following transistor circuit VBE =7 V, rc = 25mV/IE, and β and the capacitance are very large

The mid-band voltage gain of the amplifier is approximately

  • - 180
  • - 120
  • - 90
  • - 60
Q.15

The analog signal given below is sampled bysamples per second
m(t) = 2 sin 480pt + 3 sin 720pt
The folding (maximum) frequency is __________ .

  • 600 Hz
  • 120 Hz
  • 300 Hz
  • 360 Hz
Q.16

The eigen values of a skew symmetric matrix are

  • always zero
  • always pure imaginary
  • either zero or pure imaginary
  • always real
Q.17

Consider an angle modulated signal
x(t) = 6cos[2p x 106t + 2sin(8000pt) + 4cos(8000pt)] V
The average power of x(t) is

  • 10W
  • 18W
  • 20W
  • 28W
Q.18

Find the electric charge required on the earth and moon to balance their gravitational attraction if the charge on the earth istimes that on the moon.

  • 1.73 TC
  • 17.3 GC
  • 17.3 TC
  • 1.73 GC
Q.19

independent low pass signals of bandwidth W, 2W, 3W, W, 2W, 3W, W, 2W,Hz are to be time division multiplexer on a common channel using PAM. To achieve this, the minimum transmission capacity of the channel should be __________ .

  • 1 Hz
  • 12 Hz
  • 3 Hz
  • 6 Hz
Q.20

A radio wave is incident on a layer of ionosphere at an angle ofwith the vertical. If the critical frequency is, 1.2 MHz, the maximum usable frequency is

  • 1.2 MHz
  • 2.4 MHz
  • 0.6 MHz
  • 1.386 MHz
Q.21

The minimal function that can detect a "divisible byBCD code digit (representation D8D4D2D1) is given by

  • D8D1 + D4D2 + D8D2D1
  • D8D1 + D4D2 D1 + D4D2D1 + D8D4D2D1
  • D4D1 + D4D2 + D8D4 D2D1
  • D4D2D1 + D4D2D1 + D8D4D2D1
Q.22

The Nyquist sampling rate for the signal s(t) = is given by

  • 400 Hz
  • 600 Hz
  • 1200 Hz
  • 1400 Hz
Q.23

The electric field of uniform plane wave is given by E =sin (2 p x 108t- pz) x +cos (2 p x 108t - pz) y. Find phase velocity

  • 2 x 108 m/s
  • p x 108 m/s
  • 2p x 108 m/s
  • none of these
Q.24

A lossless transmission line iscm long and operates at a frequency ofMHz. Inductance and capacitances present in a line are 0.5 μH/m andpF/m. Phase constant and phase velocity are respectively.

  • 5p, 2p x 108 m/sec
  • 5p, 108 m/sec
  • 31.4, 108 m/sec
  • 31.4, 2p x 108 m/sec
Q.25

The antenna current of an AM broad cast transmitter, modulated to a depth ofby an audio sine wave isamperes. It increased toampere as a result of simultaneous modulation by another sine wave. The modulation index due to this second sine wave is :

  • 0.4
  • 0.757
  • 0.643
  • 0.8
Q.26

The region between a pin of parallel perfectly conducting planes of infinite extent is y and z directions is partially filled with a dielectric as shown below.

AGHz TE10 wave is incident on the air-dielectric interface. The value of reflection coefficient at the interface is

Q.27

Hari (H), Gita (G), Irfan (I) and Saira (S) are sibiligs (i.e. brothers and sisters). All were born on 1st January. The age difference between any two successive siblings (that is born one after another) is less than 3 years. Given the following facts:
(i) Hari's age + Gita's age > Irfan's age + Saira's age.
(ii) The age difference between Gita and Saira is 1 year. However, Gita is not the oldest and Saira is not the youngest.
(iii) There are not twins.
In what order were they born (Oldest first)?

  • HSIG
  • SGHI
  • IGSH
  • IHSG
Q.28

A control system is as shown in given figure The maximum value of gain K for which the system is stable is

  • more than 5
  • equal to 5
  • less than 1
  • less than 5
Q.29

Fourier transform of signal obtained after taking difference between step function and its reverse version is given as __________ .

  • 2jω
  • 2/jω
  • 4/jω
  • 4jω
Q.30

Two coils X ofturns and Y ofturns are placed such thatof the flux produced by coil X links coil Y. A current of 1 A in coil X produces 0.1 wb flux. The mutual inductance between coils is

  • 0.12 H
  • 0.08 H
  • 0.06 H
  • 0.04 H
Q.31

An air-filled rectangular waveguide has dimensions 8cm x 10cm . The group velocity is

  • 1.8 x 108 m/s
  • 2.6 x 108 m/s
  • 3 x 108 m/s
  • 0.3 x 108 m/s
Q.32

In the circuit s closed for a long time and steady state is reached. s is opened at t = 0+ Determine current through resistor.

  • A
  • A
  • - A
  • - A
Q.33

The probability density function of a random variable x is as shown.

The mean of the distribution is:

Q.34

Consider the sequence x(n) whose fourier transform X(ejω) is depicted for - p ≤ ω ≤ p as shown in figure

  1. x(n) is periodic
  2. Real
  3. Even
  4. Finite energy
  • 1 - True, 2 - True, 3 - True, 4 - True
  • 1 - False, 2 - True, 3 - False, 4 - True
  • 1 - True, 2 - False, 3 - True, 4 - False
  • 1 - False, 2 - False, 3 - False, 4 - True
Q.35

The Nyquist sampling rate for the signal s(t) = is given by

  • 400 Hz
  • 600 Hz
  • 1200 Hz
  • 1400 Hz
Q.36

The region between a pin of parallel perfectly conducting planes of infinite extent is y and z directions is partially filled with a dielectric as shown below.

AGHz TE10 wave is incident on the air-dielectric interface. The value of reflection coefficient at the interface is

Q.37

In a infinite ladder circuit as shown above each resistance of r Ω then find RAB

  • ∞
    13-05-44-2.png
  • 1.61r
  • none of the above
Q.38

Consider the circuit shown below of 2 : 1 MUX is given by the function g = ac + bc

Then f is :

  • X ⊕ Y
  • XY + EXY
  • XE + XY
  • none of these
Q.39

In a synchro error detector, the output voltage is proportional to [ω(t)]n, where ω(t) is the rotor velocity and n equals :

  • -2
  • -1
  • 1
  • 2
Q.40

The electric field of uniform plane wave is given by E =sin (2 p x 108t- pz) x +cos (2 p x 108t - pz) y. Find phase velocity

  • 2 x 108 m/s
  • p x 108 m/s
  • 2p x 108 m/s
  • none of these
Q.41

The following Variable Entered Map (VEM) represents which of the following function:

  • f(A, B, C, D) = ∑(1, 2, 3, 4, 7, 8, 9, 14, 15) + Φ(3, 5, 12, 13)
  • f(A, B, C, D) = ∑(1, 2, 4, 8, 10, 8, 13, 15) + Φ(3, 6, 12, 14)
  • f(A, B, C, D) = ∑(1, 2, 4, 7, 8, 10, 13, 15) + Φ(6, 12, 13)
  • f(A, B, C, D) = ∑(1, 2, 4, 7, 8, 9, 12, 13) + Φ(3, 5, 14, 15)
Q.42

Two coils X ofturns and Y ofturns are placed such thatof the flux produced by coil X links coil Y. A current of 1 A in coil X produces 0.1 wb flux. The mutual inductance between coils is

  • 0.08 H
  • 0.12 H
  • 0.06 H
  • 0.04 H
Q.43

Hari (H), Gita (G), Irfan (I) and Saira (S) are sibiligs (i.e. brothers and sisters). All were born on 1st January. The age difference between any two successive siblings (that is born one after another) is less than 3 years. Given the following facts:
(i) Hari's age + Gita's age > Irfan's age + Saira's age.
(ii) The age difference between Gita and Saira is 1 year. However, Gita is not the oldest and Saira is not the youngest.
(iii) There are not twins.
In what order were they born (Oldest first)?

  • HSIG
  • SGHI
  • IGSH
  • IHSG
Q.44

A control system is as shown in given figure The maximum value of gain K for which the system is stable is

  • more than 5
  • equal to 5
  • less than 1
  • less than 5
Q.45

In the circuit s closed for a long time and steady state is reached. s is opened at t = 0+ Determine current through resistor.

  • A
  • A
  • - A
  • - A
Q.46

The probability density function of a random variable x is as shown.

The mean of the distribution is:

Q.47

In a synchro error detector, the output voltage is proportional to [ω(t)]n, where ω(t) is the rotor velocity and n equals :

  • -2
  • -1
  • 1
  • 2
Q.48

A generator ofΩ internal impedance and operating at 1 GHz feeds aΩ load via a coaxial line of characteristic impedanceΩ. The VSWR on the feed line is

  • 0.5
  • 1.5
  • 2.5
  • 1.75
Q.49

The Nyquist sampling rate for the signal s(t) = is given by

  • 400 Hz
  • 600 Hz
  • 1200 Hz
  • 1400 Hz
Q.50

The region between a pin of parallel perfectly conducting planes of infinite extent is y and z directions is partially filled with a dielectric as shown below.

AGHz TE10 wave is incident on the air-dielectric interface. The value of reflection coefficient at the interface is

0 h : 0 m : 1 s