ISRO Scientist or Engineer Electronics 2014
For the following questions answer them individually
For a point charge having electric flux density, $$D = \frac{Q}{4 \pi r^2}a_r$$, where $$a_r$$ is the unit vector in radio direction; volume charge density $$\rho_v$$ is:
What is Discrete Time Fourier Transform (DTFT) of following signal?
$$x(n) = a^n$$ where $$n \geq 0, -1 < a < 1$$
The zener diode shown in following figure is temperature compensated and current gain $$\beta$$ of transistor is very high. If current through 100 ohm resistor is 55mA at $$25^\circ C$$, what is the approximate current throughit at $$65^\circ C$$?
Wewish to transmit a digital voice at 32 Kbps through a communication channel having bandwidth of 3000 Hz. The received signal to noise powerratio is 30 dB. State which of the following statementis true :
Consider a standard rectangular and a circular waveguide having same dominant mode cut-off frequency, determine the ratio of area of circular waveguide to rectangular waveguide:
