List of top Electronics Engineering Questions asked in Common University Entrance Test

The circuit in the given figure is,
The following circuit employing pass transistor logic, all NMOS transistors are identical with a threshold voltage of 1 V. Ignoring the body-effect, the output voltages at P, Q and R are,
The different diodes and their applications are shown in List-I and List-II, respectively. Match list List-I with List-II. A. Varactor diode, B. PIN Diode, C. Zener diode, D. Schottky diode. I. Voltage reference, II. High-frequency switch, III. Tuned circuits, IV. Current controlled attenuator.
In the following limiter circuit, the input voltage \(V_i = 10 \sin(100 \pi t)V\) is applied. Assume that the diode drop is 0.7 V when it is forward biased and the Zener breakdown voltage is 6.8 V. The maximum and minimum values of the output voltage, respectively, are
Assuming \(V_{CEsat} = 0.2\) V and \(\beta = 50\), the minimum base current (\(I_{Bmin}\)) required to drive the transistor in the figure to saturation is
The early-effect in a BJT is caused by
If fixed positive charges are present in the gate oxide of an n-channel enhancement type MOSFET, it will lead to
Due to illumination by light, the electron and hole concentrations in a heavily doped N-type semiconductor increase by \(\Delta n\) and \(\Delta p\), respectively. If \(n_i\) is the intrinsic concentration, then
Under high electric fields, in a semiconductor with an increasing electric field,
In a p-type Si sample, the hole concentration is \(2.25 \times 10^{15} \text{ cm}^{-3}\) and the intrinsic carrier concentration is \(1.5 \times 10^{10} \text{ cm}^{-3}\). The value of electron concentration will be
Crossover distortion behavior is characteristic of
A periodic signal \(x(t)\) of period \(T_0\) is given by \( x(t) = \begin{cases} 1, & |t|<T_1 \\ 0, & T_1<|t|<\frac{T_0}{2} \end{cases} \). The dc component of \(x(t)\) is
The convolution of \(x(-t)\) with impulse function \(\delta(-t - t_0)\) is equal to
A 1 kHz signal is flat-top sampled at the rate of 1800 samples/sec and the samples are applied to an ideal rectangular low pass filter with a cut-off frequency of 1100 Hz. Then the output of the filter contains:
In the figure shown below, the ideal switch has been open for a long time. If it is closed at \(t=0\), then the magnitude of the current (in mA) through the 4 k\(\Omega\) resistor at \(t=0+\) is
For a real number \( n>1 \), \( \frac{1}{\log_2 n} + \frac{1}{\log_3 n} + \frac{1}{\log_4 n} = 1 \). The value of n is
If the number of zeros is less than the number of poles, i.e. \( Z<P \), then the value of the transfer function becomes zero for \( s \to \infty \). Hence, some zeros are located at infinity and the order of such zeros will be:
For the two port network shown below, The impedances \( Z_{11}, Z_{12}, \) and \( Z_{22} \) (in \( \Omega \)) are A. \(6\Omega\), B. \(9\Omega\), C. \(24\Omega\). Choose the correct sequence of \(Z_{11}, Z_{12}, Z_{22}\) in answer from the options given below:
In the circuit shown below, the current through the inductor (in A) is
The nodal method of circuit analysis is based on
Consider the diode circuit shown below. The diode, D, obeys the current-voltage characteristic \(I_D = I_s(\exp(V_D/nV_T) - 1)\). The circuit is biased so that voltage \(V>0\) and current \(I<0\). If you had to design this circuit to transfer maximum power from the current source (\(I_1\)) to a resistive load (not shown) at the output, what values for R1 and R2 would you choose? A. Small \(R_1\), B. Large \(R_1\), C. Small \(R_2\), D. Large \(R_2\). Choose the correct answer from the options given below:
For a given vector \( W^T = [1, 2, 3] \), the vector is normal to the plane defined by \( W^T \cdot X = 1 \).
In the given figure, the vectors u and v are related as \( Au = v \) by a transformation matrix A. The correct choice of matrix A is % Vector details u = (4,3), v = (5,0)
A quadratic function of two variables is given as \( f(x_1, x_2) = x_1^2 + 2x_2^2 + 3x_1 + 3x_2 + 1 \). The magnitude of maximum rate of change of the function at the point (1,1) is
Let the probability density function of a random variable x be given as \( f(x) = ae^{-2|x|} \). The value of 'a' is