Determine the matched filter response h(t) for signal s(t) shown below:
ISRO Scientist or Engineer Electronics 2013
For the following questions answer them individually
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 :
A charge $$Q_2 = 8.854 \times 10^{-9} C$$ is located in a vacuum at $$P_2 (2,3,1)$$. The force on $$Q_2$$ due to a charge $$ Q_1 = 4 \pi \times 10^{-3} C$$ at $$P_1 (2,2,1)$$ is: (Note: All the coordinates are measured in Meters. $$a_x, a_y$$, and $$a_z$$ are unit vectors in X, Y and Z direction respectively.)
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 ?
What is the frequency and duty cycle of output Y, when CLK frequency is 1 MHz @ 50% duty cycle?
For an isotropic radiator, electric field intensity at a distance R is measured as 3 V/m. What will be the electric field intensity at a distance 3R ?
The logic function implemented by following 4 :1 MUX is
Characteristic impedance of a two-wire transmission line at 1OKHz 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?
Which is the correct waveform across capacitor in the following circuit?
Input voltage applied to a circuit is 1V rms and the output is 1 mV rms. Net gain of the circuit is:
Two ideal quantizers A and B have following specifications :
A: 5 bit Quantizer with input dynamic range of -1V to +1V with Q1 as quantization noise power
B: 8 bit Quantizer with input dynamic range of -0.5V to +0.5V with Q2 as quantization noise power.
Then Q1/Q2 will be
The divergence of magnetic field intensity is
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 9600 Hz. Whatis the baud rate and transmitted data?
A transmission line having characteristic impedance of 50ohms has to deliver 1OKW power at 100KHz to a load. Maximum permissible value of rms current anywhere along the line is 20A. Whatis the maximum VSWR that can be tolerated on this line?
Routh Hurwitz criterion is used to determine
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?
If the waveguide cross-section of a square waveguide with TE11 propagation mode isgradually deformed into a circle, then the corresponding circular waveguide mode will be:
What could be the output current rating of following shunt regulator?
An FM-CW (Frequency Modulated - Continuous Wave) Radar is essentially
The flux in a magnetic coreis sinusoidally varying at 200 Hz. The maximum flux density is 2 Tesla and eddy current loss is 15 W.If the frequency is raised to 400 Hz and maximum flux density reduced to 1 Tesla, the eddy current loss will
The eiectric field intensity E and magnetic field intensity H are coupled and propagating in free space in x and y direction respectively, the Poynfing vector is given by-
If x and y are two random signals with zero mean Gaussian distribution having identical standard deviation, the phase angle between them is
The current flowing through a capacitor in an AC circuitis :
Which of the following is the Boolean function for Majority Voting, assuming A,B,C are inputs and Y is output?
For broadside antenna array,the largest possible spacing between the antenna elements without any grating lobes is
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
Conduction angle of a Class AB amplifier is:
For non dispersive medium
Schottky clamping is resorted in TTL gates
At cut-off frequency, the phase velocity of a waveguideis
A Zener diode, when usedin voltage stabilization circuits, is biased in
The closed loop frequency response of a dc-dc converter is shown in following figure. What are the gain and phase margins?
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
3 port Circulator is
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
Gain of an RC low pass filter having a time constant $$‘\tau’$$ and frequency $$‘\omega’$$ is:
For a directional coupler, the quantities I (isolation in dB), D (directivity in dB), C (coupling in dB) are related by
The two numbers represented in signed 2’s complement form are P = 11101101 and Q = 11100110. If Q is subtracted from P, the value obtained in signed 2’s complement is
Depletion type MOSFET operates in :
Electric Field and Magnetic Field are perpendicular to each other in :
A linear regulator is attempted using discrete components as shown below. What is the output voltage?
If range of a radar is to be doubled, the peak transmit power of the radar has to be:
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
If a counter having 10 Flip Flops is initially at 0, what count will it hold after 2060 pulses ?
For a frequency modulated signal represented by $$ s(t) = 10 \sin (6 \times 10^8 t + 2 \sin 100\pi t)$$. The maximum frequéncy deviation in the carrier from its unmodulated frequency is:
For which of the following conditions, the circuit shown below will function as precision full. wave rectifier?
In a monostatic radar, if the antenna aperture is doubled, then the radar range will
The disadvantage of single stub matching is that
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 0.4 W
A memory system of size 16 K bytesis required to be designed using memory chips which have 12 address lines and 4 data lines each. Then numberof such chips required to design the memory system is
In the asymptotic bode plot of a transfer function of a closed loop system shown below, the number of poles and zeros are,
Plane Wave travelling in free space has an average Poynting vector of $$3W/m^2$$. Average energy density $$(nJ/m^3)$$ of the wave is:
For two identical n-channel JFET’s connected in parallel as shown in fig. below, the pinch-off voltage of equivalent JFET is :
The velocity at which a sinusoidal signal of $$ 10^9 rad/s$$ travels down loss-less transmission line for which $$ L = 0.4 \mu H/m$$ and $$ C = 40 pF/m is
The Maxwell’s equation $$ \triangledown \times \overline{E} = -\frac{\partial \overline{B}}{\partial t} $$ is obtained from:
A lossless line having characteristic impedance Zo is terminated with a load impedanceof jZo. VSWR of the line will be :
A signal $$ 1 + \cos (2 \pi ft) + \cos (6 \pi ft)$$ where f = 1 MHz is sampled at 3 MHz and Fourier Transform is carried out. How many lines will be seen in Fourier Transform?
The array factor of an array antenna depends on
Which of the following parameter is improved by introducing pipelining in digital design?
A transmission line having characteristic impedance $$‘Z_t’$$ of varying length in series with a load impedance $$‘Z_L’$$ appears in a Smith Chart on:
Impedance characteristics on a Smith Chart repeatafter a distance of:
If $$\tau$$ is the time constant and $$\omega$$ is the applied frequency, a low pass RC filter acts as a pure integrator when:
$$10 \mu F$$ capacitor is connected across secondary winding of a high frequency transformer having primary to secondary turns ratio 5:2. What is the value of capacitance seen across primary?
What will be the output of the following circuit, if point-P is stuck at 1?
For the current mirror circuit shown below, if the emitter area of Q2 is thrice of Q1, the current I is:
Output of an Op-ampis 1V peak,and slew rate is $$ 5V/ \mu s$$. The maximum frequency of input sinusoidal signal that can be reproducedis:
What is the division factor of the following clock divider circuit?
For the circuit given below, the voltage $$ V_O$$ across the op-amp output is:
The rms value of current $$ i(t) =I_1 \sin \omega t + I_2 \sin 2\omega t $$ is:
Given the output for the following non-inverting summing amplifier, the relation between $$R_f$$ and R in the circuit is:
A pulse signal having 100 kHz frequency and 70 nsec rise time is to be measured on an oscilloscope. The minimum required bandwidth of the oscilloscope is,
Multiple collectors are used in Traveling Wave Tube (TWT)to:
A lossless antenna has directional gain $$ G(\theta,\psi)$$, then $$\int_{\psi = -\frac{\pi}{2}}^{\psi = \frac{\pi}{2}}$$ $$\int_{\theta = -\frac{\pi}{2}}^{\theta = \frac{\pi}{2}} G(\theta, \psi)d \theta d \psi$$ is:
$$\sqrt[3]{\cos x - j \sin x}$$ is equal to
If f(t) is 1 MHz sinusoid with 1 Vp - p and sampling frequency fs is 25 KHz, the output will be:
For a practical low pass filter, the ideal amplitude and phase response will be:
A 10dB attenuator is put at the input of a low noise amplifier having 3dB noise figure. Now the noise figure of the cascaded amplifier will be.
A 33.33% duty cycle rectangular wave is fed to the input of an Spectrum Analyzer. What will be observed?
Phase function of a filter is $$(f) = kf^2,k > 0$$. The group delay of the filter has the shape
1Vp-p sinusoid is digitized by a 4 bit A-to-D converter with input dynamic range of 2 Vp-p. The signal to noise ratio of the digitized signal is:
