List of top Electronics and Communication Engineering Questions

Switch \(S_1\) is closed at time \(t = 0\) in the network shown. The expression for the voltage across capacitor \(C\) is _______.

A bulb in a staircase has two switches, one at the ground floor and one at the first floor. The bulb can be turned ON or OFF by either switch, regardless of the other switch’s state. The logic of this switching resembles _______.

VHF waves travel as _______.
The gate voltage in a JFET at which drain current becomes zero is called _______.
The drain current in a JFET is given by:
The emitter of a transistor is _______ doped.

Find the value for $i(t)$ from the circuit.

Find the $R_{eq}$ from the circuit.

Find the values of $V_{Th}$ & $R_{Th}$ in the given circuit.

Find the current $i_b$ in given circuit below.

In the given circuit a charge of 900 C is delivered to the 100 V source in a minute. The value of $V_1$ must be _______.

As the aperture area of an antenna increases, its gain _________.
Which of the following type of noise becomes of great importance at high frequencies?
The occurrence of double spotting indicates that _________.
The main advantage of super heterodyne receiver is ________.
The intrinsic impedance of free space is _________.
With some initial change at \(t = 0^+\), a capacitor will act as ________.
The standing wave ratio of an open wire transmission line having a characteristic impedance of 600\(\Omega\) and terminated by resistive load of 900\(\Omega\) will be ________.
A propagating wave in a lossless medium along z-direction has x and y electric field components both sinusoidal of same amplitude and in phase with each other. The wave is ________.
The skin depth of a wave propagating through aluminium medium of conductivity \(\sigma = 38.2~\text{MS/m}\) is computed at \(1.6~\text{MHz}\) frequency as \(64.4~\mu m\). The skin depth into the same medium at \(6.4~\text{MHz}\) frequency is ________.
An antenna driven by 6 Ampere current radiates 5 kW power into freespace. The radiation resistance of the antenna at 1 GHz frequency is ________.
Dominant mode of propagation in a rectangular wave guide is ________.
Commercial band for FM broadcasting is ________.
A uniform plane wave travels through fresh water characterised by \(\varepsilon_r = 78\). Fresh water is non-magnetic and non-conducting. The wavelength of propagation in fresh water at an operating frequency of \(300~\text{MHz}\) is ________.