List of practice Questions

The forward resistance for silicon diode carrying a current of \(20~mA\) is

The diode current equation is

The maximum time for the diode to switch from ON to OFF is called

Find the value of emitter current for a transistor with \[ \alpha_{dc}=0.98 \] and \[ I_{CBO}=5~\mu A \] when the base current is measured as \[ 100~\mu A. \]

The region of the V-I characteristic of JFET where \(I_D\) (drain current) is fairly constant is referred as

Determine the z-transform corresponding to the given pole-zero plot.

A linear time-invariant system is characterized by \[ H(z)=\frac{3-4z^{-1}} {1-3.5z^{-1}+1.5z^{-2}}. \] Which of the following is not correct?

If all the frequency components of the input signal undergo the same time delay, then the value of the group delay of the system is

A typical resistance value for a 1-cubic centimeter sample of semiconductor is

The charge carriers move gradually from the region of high carrier density to low carrier density constitutes an electric current is

The Fourier Transform of the sampled signal is given by

Determine the conditions on the sampling interval \(T\) such that \[ x(t)=\frac{\cos(2\pi t)\sin(\pi t)}{\pi t} + \frac{2\sin(6\pi t)\sin(2\pi t)}{\pi t} \] is uniquely represented by the discrete-time sequence \(x[n]=x(nT)\).

\(N\)-point DFT using FFT algorithms (radix-2) requires the following complex multiplications

A relaxed linear time-invariant system with impulse response \[ h(n)=a^n u(n), \qquad |a|<1 \] when the input is a unit step sequence, \[ x(n)=u(n), \] then the output \(y(\infty)\) of the system is

Determine the z-transform of the signal \[ x(n)=a^n(\sin\omega_0 n)u(n) \]

A square-law system is/has

If the input is \[ x[n]=-u[n]+2u[n-3]-u[n-6] \] and impulse response is \[ h[n]=u[n+1]-u[n-10] \] of an LTI system, then the output \(y[n]\) in the interval \(5\le n\le9\) is

Find the inverse Fourier Transform of \[ X(j\omega)=\frac{j\omega+1}{(j\omega)^2+5j\omega+6}. \]

The Fourier Transform of \[ \frac{d}{dt}\left(e^{-at}u(t)\right) \] is

Overlap in the shifted replicas of the original spectrum after sampling is termed

The form factor for DC supply voltage is always

The Fourier transform of a function \(f(at)\) is given by

If \(f(t)\) is a periodic waveform with even symmetry, then its Fourier series expansion does not contain

The Fourier transform of a signum function is

A \(10~\Omega\) resistor, a \(1~H\) inductor and a \(1~F\) capacitor are connected in parallel. The combination is driven by a unit step current. Under steady-state conditions, the source current flows through