1. Determine the matched filter response for signal set) shown below· <img src='./qimages/1650-1.jpg'>

<img src='./qimages/1650-1a.jpg'>

<img src='./qimages/1650-1b.jpg'>

<img src='./qimages/1650-1c.jpg'>

<img src='./qimages/1650-1d.jpg'>


2. A signal source with 100m wavelength is connected to the input terminals of a 150m long transmission line terminated in its ·characteristic impedance. The phase difference between the voltages at two ends of the transmission line in steady-state condition is:

2pie

3pie

4pie

pie

3. A charge Q2=8.854xl0 -9C is located in a vacuum at The force on Q2 due to a charge Q1=4 piexl0-3 C at P1 (note: All the coordinates are measured in meters. ax,ay and az are unit vectors in X rand Z direction respectively)

<img src='./qimages/1650-3.jpg'>

4. A low pass filter as shown in following figure is built using an operational amplifier having unity gain bandwidth of 1MHz.what is the bandwidth of this circuit?
<img src='./qimages/1650-4.jpg'>


1KHZ

10KHZ

100KHZ

500KHZ

5. what is the frequency and duty cycle of Y,when CLK frequency ids 1MHz@50% duty cycle? <img src='./qimages/1650-5.jpg'>


500 KHz 50% duty cycle

500 KHz 25% duty cycle

250 KHz 50% duty cycle

250 KHz 25% duty cycle


6. For anisotropic radiator, electric field intensity at a distance R is measured as 3V/m. what will be the electric field intensity at a distance 3R


1 V/m

1/3 V/m

1/9 V/m

3 V/m


7. The logic function implemented by following 4:1 MUX is <img src='./qimages/1650-7.jpg'>

Z X and Y

Z X or Y

X xor Y

Z xnor Y


8. Characteristic impedance of a two-wire transmission line at 10KHz is 200-j50 ohms. Line is terminated in its characteristic impedance, and a 28.28V p-p signal is measured at its input. Determine the real power supplied by the signal source to the line?

0.5W

0.485W

0.47W

0.25W

9. Which is the correct waveform across capacitor in the following circuit? <img src='./qimages/1650-9.jpg'>


<img src='./qimages/1650-9a.jpg'>

<img src='./qimages/1650-9b.jpg'>

<img src='./qimages/1650-9c.jpg'>

<img src='./qimages/1650-9d.jpg'>


10. Input voltage applied to a circuit is 1V rms and the output is 1mV rms. Net gain of the circuit is:


+30dB

-30dB

-60dB

+60dB

11. Two ideal quantizers A and B have following specifications: 5 bit Quantizer with input dynamic range of -1V to +1V with Q1 as quantization noise
power 8 bit Quantizer with input dynamic range of -0.5V to +0.5V with Q2 as quantization noise power. Then Q1/Q2 will be

16

256

64

128

12. The divergence of magnetic field intensity is

Electric charge density

Electric field intensity

Zero

Conduction current density

13. A UART is configured to transmit 8 bit data, 1 start bit and 1 stop bit. The serial data output is observed on oscilloscope, which looks like a square wave with frequency of 9600Hz. What is the baud rate and transmitted data?


Baud rate 9600, Data 55h

Baud rate 19200, Data 55h

Baud rate 19200, Data FFh

Baud rate 9600, Data =AAh


14. A transmission line having characteristic impedance of 500hms has to deliver 10KW power at 100KHz to a load. Maximum permissible value of rms current anywhere along the line is 20A.What is the maximum VSWR that can be tolerated on this line?

2

1

3

2.5

15. Routh Hurwitz criterion is used to determine

Relative stability of the system

Time response of the system Roots of the characteristic equation

Absolute stability of the system

graphically

16. The decoding circuit shown in the figure is has been used to generate active low chip select signal of memory interfaced to 8 bit microprocessor with 16 bit address bus. What is address range and size of memory?
<img src='./qimages/1650-16.jpg'>


D000h to EFFFh,size= 8K Bytes

D000h to DFFFh,size= 4K Bytes

C000h to FFFFh,size= 16K Bytes

E000h to EFFFh,size 4K Bytes


17. If the wave guide cross-section of a square wave guide with TE11 propagation mode is gradually deformed into a circle, then the corresponding circular wave guide mode will be:


TE11

TE10

TE2l

TE12

18. What could be the output current rating of following shunt regulator? <img src='./qimages/1650-18.jpg'>

0 IL 100mA

20mA IL< 100mA

0 IL 50mA

10mA IL 100mA

19. An FM-CW (Frequency Modulated--Continuous Wave) Radar is essentially

bistatic

Monostatic

Can operate either as monostatic or as Bistatic

None of the above


20. The flux in a magnetic core is sinusoidally varying at 200Hz. The maximum flux density is 2 Tesla and eddy current loss is 15W. If the frequency is raised to 400Hz and maximum flux density reduced to 1 Tesla, the eddy current loss will

a)Reduce to half

b)Get doubled

Reduce to one-fourth

Remain same


21. The electric field intensity E and magnetic fuel? intensity H are coupled and propagating in free space in x and y direction respectively, the Poynting vector is given by

EHx

EHy

EHxy

None of the above


22. If x and y are two random signals with zero mean Gaussian distribution having identical standard deviation, the phase angle between them is

Zero mean Gaussian distributed

Uniform between -pie and pie

Uniform between -pie/2 and pie/2

Non-zero mean Gaussian distributed

23. The current flowing through a capacitor in an AC circuit is:

Non-existent

Conduction current

Displacement current

None of the above

24. which of the following is the Boolean function for majority voting, assuming are inputs and Y is output?


Y AB AC CB

Y

Y ABC

Y AB BC


25. For broadside antenna array,the largest possible spacing between the antenna elements without any grating lobes is

lamda/2

lamda

2lamda

None of the above

26. For the 8085 assembly language program given below, the content of the accumulator
after the execution of the program is

3000 MVI A,45H
3002 MOV B,A
3003 STC
3004 CMC
3005 RAR
3006 XRA B


00H

45H

67H

E7H

27. Conduction angle of a Class AB amplifier is:

<180°

Between 180° and 360°

360°

90°

28. For non dispersive medium

Phase velocity Group velocity

Phase velocity Group velocity

Phase velocity Group velocity

None of the above

29. Schottky clamping is resorted in TTL gates

to reduce propagation delay

to increase noise margins

to increase packing density

to increase fan-out

30. At cut-off frequency, the phase velocity of a wave guide is

Zero

Infinite

Finite

None of the above

31. A Zener diode, when used in voltage stabilization circuits, is biased in

a)reverse bias region below the breakdown voltage


reverse breakdown region

forward bias region

forward bias constant current mode

32. The closed loop frequency response of a dc-dc converter is shown in following figure.what are the gain and phase margins? <img src='./qimages/1650-32.jpg'>

20dB, 80 deg

26dB, 80 deg

20dB, 120 deg

26dB, 120 deg

33. If for a silicon npn transistor the base-to-emitter voltage(VBE) is 0.7V and the collector-to-base voltage(VCB) is 0.2 V,then the transistor is operating in the

normal active mode

saturation mode

inverse active mode

cutoff mode

34. 3 port circulator is

Reciprocal,matched

non Reciprocal,non matched

non Reciprocal,matched

Reciprocal,non matched

35. an 8 bit ripple counter and an 8 bit synchronous counter are made using flip flops having a propagation delay of 10 ns each if the worst case delay in the ripple counter and the synchronous counter be r and s respectively,then

R=10ns,S=80ns

R=40ns,S=10ns

R=10ns,S=10ns

R=80ns,S=10ns


36. Gain of an RC low pass filter having a time constant and frequency is:

<img src='./qimages/1650-36.jpg'>

37. For a directional coupler the quantities I (isolation in D (directivity in C (coupling in dB) are related by









38. The two numbers represented in signed complement form are P=11101101 and Q=11100110.
If Q is subtracted from P,the value obtained in signed complement is

1000001111

00000111

11111001

111111001


39. Depletion type MOSFET operates in

Depletion model only

Enhancement Mode only

Both depletion and enhancement mode

None of the above

40. Electric Field and Magnetic Field are perpendicular to each other in:

Klystron

Magnetron

TWTA

All of the above


41. A linear regulator is attempted using discrete components as shown below. what is the output voltage?
<img src='./qimages/1650-41.jpg'>


9.3V

7.5V

0V

2.5V

42. If range of a radar is to be doubled, the peak transmit power of the radar has to be:

Increased by a factor of 2

Increased by a factor of 4

Decreased by a factor of 4

Increased by a factor of 16

43. The electric field measured in the far field of an antenna at a distance of 50m is 1V/m. The average power densities at a distance of 500m from the antenna is

26.6mew W/m2

0.1mew W/m2

10mew W/m2

13.3mew W/m2


44. If a counter haYing 10 Flip Flops is initially at what count will it hold after 2060 pulses?


000 000 1100

000 001 1100

000 001 1000

000 000 1110

45. For a frequency modulated signal represented by s(t)=l0sin(6 x l0 8t 2sin100piet). The maximum frequency deviation in the carrier from its unmodulated frequency is:

990Hz

100Hz

50Hz

200Hz

46. For which of-the following conditions, the circuit shown below will function as precision full wave rectifier? <img src='./qimages/1650-46.jpg'>

R1=R2=R

R1=R3=R

R2=2R1

R1=R2=R3

47. In a monostatic radar, if the antenna aperture is doubled, then the radar range will

Reduce by a factor of 2

Increase by a factor of 2

Reduce by a factor of root 2

Increase by a factor of root 2

48. The disadvantage of single stub matching is that

Every load needs a new stub position

Only shunt stub should be used

Only resistive load can be matched

Useful only in two wire transmission line


49. A certain antenna with an efficiency of 95% has maximum radiation intensity of 0.5 W/sr. The directivity of the antenna fed by input power of 0.4W


16.53

12.2

10.36

11.31


50. A memory system of size 16K bytes is required to be designed using memory chips which have 12 address lines and 4 data lines each. Then number of such chips required to design the memory system is

2

4

8

16


51. In the asymptotic bode plot of a transfer function of a closed loop system shown below, the number of poles and zeros are, <img src='./qimages/1650-51.jpg'>


3 pole, 2 zero

2 pole, 2 zero

2 pole, 1 zero

3 pole, 1 zero

52. Plane Wave travelling in free space has an average Poynting vector of 3W/m2 Average energy density (nJ/m3)of the wave is:

10

5

1

3

53. For two identical n-channel JFET's connected in parallel as shown in fig. below, the pinch-off voltage of equivalent JFET is:
<img src='./qimages/1650-53.jpg'>

Doubled

Becomes half

Remains same

None of the above

54. The velocity at which a sinusoidal signal of 10 9 rad/s travels down a loss-less transmission line for which L 0.4 mewH/m and C 40 pF/m is

2.36x10 8m/s

2.5x10 8m/s

5x10 9m/s

4.5x10 9m/s

55. The Maxwell's equation <img src='./qimages/1650-55.jpg'> is obtained from:

Ampere's Law

Farady;s Law

lenz's Law

both b and c

56. A lossless line having characteristic impedance Z0 is terminated with a load impedance of jZ0.VSWR of the line will be:

1

10

Infinite

none of the above

57. A signal 1+cos(2pieft)+cos(6pieft) where f=1MHz is sampled at 3MHz and Fourier Transform is carried out.how many lines will be seen in Fourier Transform?

5

1

3

2

58. The array factor of an array antenna depends on

Number of radiating elements

spacing between the elements

phase of the applied signal

all of the above

59. which of the following parameter is improved by introducing pipelining in digital design?

Area(Gate out)

Maximum clock frequency

power dissipation

Noise

60. A transmission line having characteristic impedance of varying length in series with a load impedance appears in a smith chart on:

Constant Resistance Circle

Constant VSWR Circle

Constant Reactance Circle

All of the above

61. Impedance characteristics on a smith chart repeat after a distance of:

lamda

lamda/4

lamda/2

none of the above


62. If T is the time constant and w is the applied frequency, a low pass RC filter acts as a pure integrator when:

wt=0



wt=1



63. 10mewF capacitor is connected across secondary winding of a high frequency transformer having primary to secondary turns ratio 5:2. what is the yalue of capacitance seen across primary?


4mewF

62.5mewF

25mewF

1.6mewF

64. What will be the output of the following circuit, if point-P is stuck at <img src='./qimages/1650-64.jpg'>








0

65. For the current mirror circuit shown below, if the emitter area of Q2 is thrice of Q1, the current I is: <img src='./qimages/1650-65.jpg'>


0.328mA

2.955mA

0.105mA

O.012mA


66. Output of an Op-amp is IV peak, and slew rate is 5V/mews. The maximum frequency of input sinusoidal signal that can be reproduced is:


398Hz

796Hz

796KHz

398KHz


67. what is the division factor of the following clock divider circuit? <img src='./qimages/1650-67.jpg'>

2

3

1.5

2.5


68. For the circuit given below, the voltage Vo across the op-amp output is: <img src='./qimages/1650-68.jpg'>

-9Vi

-3Vi

-11Vi

9Vi


69. The rms value of current =I1Sinwt I2Sin2wt is:

<img src='./qimages/1650-69.jpg'>

70. Given the output for the following non-inverting summing amplifier, the relation between Rf and R in the circuit is <img src='./qimages/1650-70.jpg'>

Rf=R

Rf=4R

Rf=2R

Rf=R/2


71. A pulse signal having 100 KHz and 70 n sec rise time to be measured on an oscilloscope. The minimum required bandwidth of the oscilloscope is,


500kHz

14.3MHz

5MHz

200KHz

72. Multiple collectors are used in Travelling Wave Tube(TWT) to

To distribute the dissipated heat evenly

To increase the overall efficiency

To increase the gain of the TWT

to shape the electron beam

73. A lossless antenna has directional gain theta,pie) then <img src='./qimages/1650-73.jpg'> <img src='./qimages/1650-73-1.jpg'>

4 pie

2 pie

pie

pie

74. <img src='./qimages/1650-74.jpg'>

75. If is 1 MHZ sinusoid with 1 vp-p and sampling frequency is 25KHz, the output will be: <img src='./qimages/1650-75.jpg'>

0V

DC value anywhere between -1V and +1V

0.5V and +0.5V

1Vp-p 1MHz sinusoid

76. For a practical low pass filter, the ideal amplitude and phase response will be:

<img src='./qimages/1650-76a.jpg'>

<img src='./qimages/1650-76b.jpg'>

<img src='./qimages/1650-76c.jpg'>

<img src='./qimages/1650-76d.jpg'>


77. A 10dB attenuator is put at the input of a low noise amplifier haYing 3dB noise figure. Now the noise figure of the cascaded amplifier will be

3dB

12dB

7dB

None of the above

78. A 33.33% duty cycle rectangular wave is fed to the input of an Spectrum Analyzer.
What will be observed?

<img src='./qimages/1650-78.jpg'>

79. phase function of a filter is the group delay of the filter has the shape

<img src='./qimages/1650-79a.jpg'>

<img src='./qimages/1650-79b.jpg'>

<img src='./qimages/1650-79c.jpg'>

<img src='./qimages/1650-79d.jpg'>


80. 1V p-p sinusoid is digitized by a 4 bit A-to-D converter with input dynamic range of 2V p-p The signal to noise ratio of the digitized signal is:

384

96

48

24