ISRO Scientist/Engineer ECE Solved Papers
Practice previous years' questions for Electromagnetics, Antennas, Microwave Engineering, Digital Communication, Signals & Systems, Analog Electronics, VLSI, and Optical Communications.
All ISRO ECE PYQs / All ECE Subjects / All Topics
Marking scheme: +3.00 positive, -0.75 negative (ICRB Standard).
Ξ±, Ξ² 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 in a computer that has 8-bit word length and uses 2's complement arithmetic is
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 power content of 8 KW at carrier frequency and 2 KW in each of its side bands is
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-Amps to 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 4A/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 open circuit, the VSWR is
Unit of relative permeability is
$f(x) = [\tan^2 x]$ ([] stands for greatest integer function)
Number of real values of $(a+ib)^{1/n} + (a-ib)^{1/n}$ is
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 store is
An audio frequency of 15 KHz is frequency modulated with a deviation of 75 KHz. The resulting bandwidth is
A 1kW carrier is Amplitude Modulated to a depth of 60%. The total power in the modulated carrier is
The y21 parameter of the network shown in the given figure will be