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.
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Marking scheme: +3.00 positive, -0.75 negative (ICRB Standard).
The purpose of a Cassegrain feed in a parabolic reflector antenna is to
A transfer function G(s) has pole-zero plot as shown in the figure. Given that the steady state function gain is 2, the transfer function G(s) will be given by
The impedance of a series RLC circuit is
The advantage of $\pi/4$ QPSK compared to conventional QPSK is ?
A moving coil iron ammeter may be compensated for frequency errors by
Find the value of Vo in the figure.
What is the approximate skin depth in copper at 100 MHz?
While designing a low noise amplifier, what is the importance of 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 surface is
Given that $$A = \begin{bmatrix} 1 & 0 & 0 \\ 0 & 2 & 0 \\ 0 & 0 & 3 \end{bmatrix}$$ Evaluate $A^3 - 6A^2 + 11A - 10I$
$$\lim_{x \to 0} x \log(\sin x)$$ is
A 12 bit ADC is operating with a 1 ΞΌs clock period and the total conversion time is seen to be 14 ΞΌs. The ADC must be of
Which of the following types of devices is not field programmable?
Which is the correct order of different process steps for a typical FPGA design?
The theoretical dividing line between Reduced Instruction Set computing (RISC) microprocessor and Complex Instructions Set Computing (CISC) microprocessor is
In a pulsed radar, the peak radar transmitter power is 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 PPS and a pulse width of 1 micro second. Its duty cycle is
Which of the following technology results in least power dissipation ?
A power MOSFET is a
The advantage of differential PSK (DPSK) over coherent PSK is
An ideal current meter should have
For the network shown in the figure $V_i(t)$ 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 1/32 Ξ». What will be the nature of its input impedance?
Refer to the circuit in the figure. Which of the following statements is NOT true about this circuit?
Which of the following is the correct continuity equation: