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BARC Full Syllabus Test 18

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Question 1

Determine the instantanous frequency of the signal 10 cos [20 πt + πt2] in hertz.

Question 2

For the self-bias circuit shown in the above figure, the stability factor ‘S’ of the given circuit approximately is ____ (S = ) where both  and β are kept constant (take β >>1)

Question 3

If a characteristics equation has roots then the values of natural frequency and damping ratio will be respectively.

Question 4

Consider the following circuit with the intial state Q0 = Q1 = 0. The D flip-flop are positive edge triggered and have set up times 25 ns and hold time 0ns.

Consider the following timing diagrams of X and C, the clock period of C = 40 nS. Which of one is correct plot of Y

Question 5

For the following circuit. Find the currents I1& I2 ? (assuming op – amp to be ideal)

Question 6

A low pass random process has a white-noise power spectral density
SX(ω) = N/2 for | ω | 2πB
Determine the Power PX contained by the process

Question 7

The Nyquist plot of an open – loop function of a negative feedback control system is shown below:

For open loop system was given as stable, the closed loop system will be________.

Question 8

What are the contents of Q1 & Q0 after 78th clock pulse. Initially the contents are Q1 = 0 , Q0 = 0



Question 9

In a uniform linear array, four isotropic radiating elements are spaced λ/2 apart. The progressivephase shift between the elements required for forming the main beam at 60 ° off the end fire is

Question 10

For a monostable multibrator using IC555 if RA = 2kΩ, RB = 4 kΩ and C = 0.1 μf calculate the frequency of output waveform is ______ KHz

Question 11

What will be the required height of a T.V. tower which can cover the population of 60.3 lakhs if average population density around the tower is 1000 km-2? [Radius of earth = 6.4 x 106 m]

Question 12

region 1, Z<0 and region 2, Z>0 are both perfect dielectrics. A uniform plane wave travelling in the direction has a frequency of .Its Wavelength in two regions are SWR in region 1 is

Question 13

In the circuit of fig output voltage is  V for a certain set of . The will be 2 V if

Question 14

The average value of the periodic waveform shown is

Question 15

The minimum value of the function occurs at x = n the interval occurs at x = ________.
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Sep 13ESE & GATE EC