List of practice Questions

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

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

Let \(A\) and \(B\) be \(n\times n\) real matrices. Which of the following statements is correct?

The Gauss's law for magnetic fields is

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 characteristic impedance of the medium is

The depth of penetration decreases, if

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)

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

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

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

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

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?

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

A random process is stationary

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

The following are properties of auto correlation except

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?

The quadrature null effect of the coherent detector occur at

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

In the transmission of television signals in practice, a controlled amount of carrier is added to the VSB modulated signal. This is done to use

Prior to sampling, the type of filter used to attenuate high frequency components of the signal that lie outside the band of interest is