List of top Electronics and Communication Engineering Questions asked in TS PGECET

The S-parameters are used at microwave frequencies because of the following reasons, except

Find the maximum gain of a \(\frac{\lambda}{2}\) wire dipole operating at 30 MHz?

For a lossy transmission line, the characteristic impedance does not depend on

The fraction of time that the transmitter is transmitting during one radar cycle is called

A rectangular waveguide with dimensions \(a=2.5\) cm, \(b=1\) cm is operating below 15 GHz. If the guide is filled with a medium characterized by \(\sigma=0\), \(\epsilon=4\epsilon_0\), \(\mu_r=1\), calculate the cutoff frequency of dominant mode?

Identify the polarisation of the wave given, \(E_x=2\cos\omega t\), \(E_y=2\sin\omega t\) and the phase difference is \(+90^\circ\)

The Gauss's law for magnetic fields is

Snell's law states that (\(n_1\) is the index of refraction of the first medium and \(n_2\) is that of second, \(\theta_t\) is the angle of refraction and \(\theta_i\) is angle of incidence)

The depth of penetration decreases, if

The characteristic impedance of the medium is

In communication receivers, the filter used to reduce receiver gain at some specific frequency is

The Foster-Seeley discriminator along with amplitude limiter is called

A four level PAM has a input data rate of \(2400~bits/s\) then the symbol rate is

Which of the following is not correct if the intermediate frequency is too high?

Match the following: A: ASK, B: APK, C: PSK, D: FSK

If the rows of channel matrix are all equal to each other, then the channel capacity is

The problem of reducing the gain of receiver for weak signals is avoided by

A receiver connected to an antenna whose resistance is \(50~\Omega\) has an equivalent noise resistance of \(30~\Omega\). Calculate the receiver's noise figure?

What are the conditions for distortion less transmission through a system?

The random process \(X(t)=A\cos(\omega_0 t+\theta)\) is wide-sense stationary, where \(A\) and \(\omega_0\) are constants and \(\theta\) is a uniformly distributed random variable on the interval \((0,2\pi)\). Then the mean value is

A TDM system is used to multiplex four independent voice signals each sampled at the rate of 8 kHz using PAM. The system incorporates a synchronizing pulse train for its proper operation. Calculate the transmission bandwidth?

A random process is stationary

The following are properties of auto correlation except

To develop the time-domain description of SSB modulation, the required mathematical tool is known as