ISRO Scientist or Engineer Electronics 2014

What is the output signal level of following circuit?

The effect of channel coding in communication channels is :

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 $$n \geq 0, -1 < a < 1$$

In the near field, the radiated wavestake the form of :

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:

What is the lowest level of abstraction in any hardware description language?

With the introduction of negative feedback, the gain-bandwidth product of an amplifier