If a counter having 10 FFsis initially at 0, what countwill it hold after 2060 pulses?
ISRO Scientist or Engineer Electronics 2009
For the following questions answer them individually
Amemory system of size 16 K bytes is required to be designed using memory chips which have 12 address lines and 4 datalines each. Then the numberofsuch chips required to design the memory system is
Consider the following program for 8085
XRAA
LXI B, 0007H
LOOP: DCXB
JNZ LOOP
The loop will be executed
Acertain JK FF has $$t_{pd}$$=12 ns. The largest MOD counter that can be constructed from such FFs and still operate up to 10 MHz is
Convolution of x(t+5) with impulse function $$\delta$$ (t-7) is equal to
The purpose of a Cassegrain feed in a parabolic reflector antenna is to
A transfer function G(s) has pole-zero plot as Im "shown in the figure. Given that the steady state function gain is 2,, the transfer function A G(s) will be given by
The impedance of a series RLC circuit is
The advantage of $$\frac{\pi}{4}$$ QPSK compared to conventional QPSKis ?
A movingcoil iron ammeter may be compensated for frequency errors by
Find the value of $$V_{o}$$ in the figure.
What is the approximate skin depth in copper at 100 MHz?
While designing a low noise amplifier, what is the importanceof the noise resistance of a transistor?
Unattenuated radiation field at the surface of the earth of a quarter-wave monopole will exist if the earth surfaceis
Given that $$\begin{bmatrix}1 & 0 & 0 \\0 & 2 & 0 \\0 & 0 & 3 \end{bmatrix}$$
Evaluate $$A^{3}-6A^{2}+11A-10I$$
$$\lim_{x \rightarrow 0} x \log \sin(x)$$ is
A12 bit ADC is operating with a 1 ps clock period and the total conversion time is seen to be 14 $$\mu$$ s. The ADC must be of
Which of the following types of devices is not field programmable?
Which is the correct orderofdifferent process steps for a typical FPGA design?
The theoretical dividing line between Reduced Instruction Set computing (RISC) microprocessor and Complex Instructions Set Computing (CISC) microprocessoris
Ina pulsed radar, the peak radar transmitter poweris increased by a factor of 81 keeping all other radar parameters unchanged. The maximum range capability of the radar increases by a factor of
A radar transmitter has a PRF of 1500 PPSand a pulse width of 1 micro second. Its duty cycle is
Whichofthe following technology results in least power dissipation 2
A power MOSFET is a
The advantage of differential PSK (DPSK) over coherent PSKis
An ideal current meter should have
For the network shown in the figure V;(t) is the input and i(t) is the output. The transfer function $$\frac{I(s)}{v_{i}(s)}$$ of the network is
The length of a lossy shorted stub is $$\frac{1}{32} \lambda $$ he Whatwill be the natureof its input impedance?
Refer to the circuit in the figure. Which of the following statements is NOT true about this circuit?
Which of the followingis the correct continuity equation:
$$\alpha ,\beta$$ are the roots of the equation $$x^{2} + x + 1 = 0$$. Then $$\alpha^{3n} + \beta^{3n}$$ is
A point moving in the complex plane satisfies the following relation $$z^{2} + z^{*^{2}} = 8$$, where $$z^*$$ stands for the complex conjugate of z. The difference of the distances of the moving point from $$(2 \sqrt{2}, 0)$$ and $$(-2 \sqrt{2}, 0)$$ is
The greatest negative number which can be stored ina computer that has 8-bit word length and uses 2’s complementarithmeticis
Which of the following ADCs uses over sampling in its operation
A mealy state machine’s output depends on
The characteristic equation of the $$T - FF$$ is given by
Percentage modulation of an AM wave having a powercontent of 8 KW at carrier frequency and 2 KW in each of its side bandsis
Approximate equivalent noise temperature (deg. K) of an amplifier with a noise factor of 1.04 is
A differential amplifier is used in the input stage of Op-Ampsto achieve very high
Which two-port parameters are best suited for analyzing a series-shunt feedback circuit?
For the circuit shown in the figure, the switch is closed at t = 0. After some time when the current in the inductor was 6A,the rate of change of current through the inductor was 4 A/sec. The value of the inductor is
In the circuit shown in the above figure, the value of output $$V_{0}$$ is
The characteristics equation of a closed loop control system is given as $$s^{2} + 4s + 16 = 0$$. The resonant frequency in radian/sec of the system is
Which point in the Smith Chart is labeled with the WRONG impedance?
If a line is terminated in an opencircuit, the VSWRis
Unitof relative permeability is
$$f(x) = [\tan^{2} x]$$
([ ] stands for greatest integer function)
Number of real values of $$(a+ib)^{\frac{1}{n}}+(a-ib)^{\frac{1}{n}}$$
A 5 bit DAC has a current output. For a digital input of 10100, an output current of 10 mA is produced. What will be the output current for a digital input of 11101?
The ethernet protocol uses
A micro controller differs from a microprocessor in terms of
An 8-bit microcontroller has an external RAM with the memory map from 8000H to 9FFFH. The number of bytes this RAM can storeis
An audio frequency of 15 KHz is frequency modulated with a deviation of 75 KHz. The resulting bandwidthis
A 1kW carrier is Amplitude Modulated to a depth of 60%. The total power in the modulated carrier is
The $$y_{21}$$ parameter of the network shown in the given figure will be
An inductance of 1 His realized using air core with 100 turns. Whatwill be the inductanceif the numberof turns are doubled ?
An inductor of inductance 0.1 H, carrying current of 6 Amps will store energy of
A coil has self resistance of SΩ and inductance of 1 $$\mu$$H. The value of Q at 1 MHz frequency is
The closed loop transfer function of a unity feedback control system is $$G(s) = \frac{1}{(s + 2)^{2}}$$.The closed loop transfer function will have poles at
The dominant modeof propagation in microstrip line in low frequency approximation is
Consider a transmission line of characteristic impedance 50 ohms and theline is terminated at one end by +j50 ohms, the VSWRproducedin the transmission line will be
The divergence of magnetic flux density is
A straight line and a circle of radius a are given. A chord is drawn at random to this circle parallel to the given line. Expected length of the chordis
There is a function $$f(x)$$, such that $$f(0) = 1$$ and $$f'(0) = -1$$ and $$f(x)$$ is positive for all values of $$x$$. Then,
Interrupt latencyis the time elapsed between:
Inverse Fourier transform of signal
$$X(j \omega) = 2 \pi \delta (\omega) + \pi \delta (\omega - 4 \pi )+ \pi \delta (\omega + 4 \pi )$$
Determine the discrete-time Fourier Transform for the signal
$$x[n] = [-2, -1, 0, 1, 2]$$
Auto-correlation of a sinusoid $$s(t) = A \sin(\omega t)$$ is
A source produces 4 symbols with probabilities $$\frac{1}{2},\frac{1}{4},\frac{1}{8},\frac{1}{8}$$ For this source, a practical coding scheme has an average codeword length of 2 bits/symbol. The efficiency of the code is
When signal frequency is 2000 KHz and IF is 455 KHz,the image frequency could be
The Q of RLC tuned circuit with source voltage V in the figure is 100 at resonant freuquency of 100 KHZ What is the voltage $$V_{L}$$ across inductor at resonance ?
A 5 V reference is drawn from the circuit shown in the figure. Zener diode of 400 mW and 5V with firing current of 5 mA is used. The value of $$R_{s}$$ is
Find the equivalent resistance 200 Q R for the network shown in the figure.
The Voltage across last resistor is V. All resistors are unity. Then $$V_{s}$$ is given by
Natural frequency of a unity feedback control system of transfer function G(s)=$$\frac{10}{s(s+1)}$$
Which ofthe following conditions will not guarantee a distortionless transmission line?
For a line of characteristic impedance $$Z_{o}$$ terminated in a load $$Z_{R}$$ such that $$Z_{R} > Z_{0}$$, the Voltage Standing Wave Ratio (VSWR)is given by
The beam width of a reflector antenna of diameter = 70 cm at 30 GHz is
$$T_{r} = \frac{r}{1+r^{2} + r^{4}}$$
$$\sum_1^ \infty T_{r} = $$
A man with n keys wants to open a lock. He tries his keys at random. The expected number of attempts for his success is (keys are replaced after every attempt)
