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

At room temperature, the energy band gap of different materials have been listed in the table below. Correctly match the energy band gap (List-I) with the corresponding material (List-II). 

LIST-I (Energy band gap)  LIST-II (Material)
A. \( E_g = 0.67 \) eVI. Polymer
B. \( E_g = 1.1 \) eVII. Germanium
C. \( E_g = 1.43 \) eVIII. Silicon
D. \( E_g > 5 \) eVIV. Gallium Arsenide

Signals and their Fourier Transforms are given in the table below. Match LIST-I with LIST-II and choose the correct answer.

LIST-ILIST-II  
A. \( e^{-at}u(t), a>0 \)I. \( \pi[\delta(\omega - \omega_0) + \delta(\omega + \omega_0)] \)
B. \( \cos \omega_0 t \)II. \( \frac{1}{j\omega + a} \)
C. \( \sin \omega_0 t \)III. \( \frac{1}{(j\omega + a)^2} \)
D. \( te^{-at}u(t), a>0 \)IV. \( -j\pi[\delta(\omega - \omega_0) - \delta(\omega + \omega_0)] \)
Consider an LTI system with a system function \( H(z) = \frac{1}{1 - \frac{1}{4}z^{-1}} \). Its difference equation will be
A discrete-time system has an input-output relationship: \( y[n]=\begin{cases} x[n], & n \ge 1 \\ 0, & n=0 \\ x[n+1], & n \le -1 \end{cases} \). The given system may have the properties: A. Linearity, B. Time-invariance, C. Causality, D. Stability. Choose the correct properties.

A MOD 2 and a MOD 5 up-counter when cascaded together results in a MOD ______ counter.

X is a continuous random variable with probability density function given by \(f(x) = \{kx \text{ for } 0 \le x<2; 2k \text{ for } 2 \le x<4; -kx+6k \text{ for } 4 \le x<6\}\). The value of k will be
A plane wave whose electric field is given by \(\vec{E} = 100\cos(\omega t - 6\pi x)\hat{z}\) passes normally from a material 'A' having \(\epsilon_r=4, \mu_r=1\) and \(\sigma=0\) to a material 'B' having \(\epsilon_r=9, \mu_r=4\) and \(\sigma=0\). The values of some of its parameters are given below:
A. \(6\pi\),
B. \(80\pi\),
C. \(1/7\),
D. \(8/7\).
Choose the correct sequence: intrinsic impedance of medium B, Reflection coefficient, Transmission Coefficient and Phase shift constant of medium B, respectively, from the options given below:
Consider the following statements on TCP/IP
A. At the physical and data link layers, TCP/IP does not define any specific protocol.
B. At the internetwork layer, TCP/IP supports the Internetworking Protocol.
C. At the transport layer, TCP/IP defines five protocols.
Choose the correct answer from the options given below:
The commonly used operating systems for IoT devices are
A. Contiki
B. TinyOS
C. Linux
D. Nano-RK
Choose the correct answer from the options given below:
Which application allows a user to access and change remote files without actual transfer over a complete network?
Communication Protocols that are currently used in IoT are:
A. HTTP/Rest,
B. IPv6,
C. TCP,
D. MAC.
The Communication Protocols used at each layer of IoT Network Stack: Application Layer, Transport Layer, Network Layer, Link Layer, respectively, in a sequence are
In an impedance Smith chart, a clockwise movement along a constant resistance circle gives rise to
____ is a language for creating Web pages.
IoT Communication Protocols and their architecture name are given in the following table. Match List-I (Protocol Name) with List-II (Architecture).
The input impedance of a \(\frac{\lambda}{8}\) section of a lossless transmission line of the characteristic impedance \(50\Omega\) is found to be real when the other end is terminated by a load \(Z_L = (R + jX)\Omega\). If \(X\) is \(30\Omega\) the value of R (in \(\Omega\)) is
Consider an air filled rectangular waveguide with dimensions a = 2.286 cm and b = 1.016 cm. The increasing order of the cut-off frequencies for different modes is:
A. TE\(_1_0\),
B. TE\(_0_1\),
C. TE\(_2_0\),
D. TE\(_1_1\).
Choose the correct answer from the options given below:
The law/Theory and equations are given in the table below. Match List-I with List-II
Theorem/law and its corresponding specified quality are given in the table below. Match List-I with List-II
A rectangular waveguide 2.29 cm \(\times\) 1.02 cm operates at a frequency of 11 GHz and a cut-off frequency of 6.55 GHz in TE10 mode. If the maximum potential gradient of the signal is 5 kV/cm, then the maximum power handling capacity of the waveguide will be
Consider the following codes:
A. Hamming Code,
B. Huffman Code,
C. Shannon-Fano Code,
D. Convolution Code. Which of these are source codes?
A dipole antenna, with some excitation in free space was radiating a certain amount of power. If this antenna is immersed in a lake where water is non-magnetic and non-dissipative but has a dielectric constant of 81, the radiated power with the same excitation will
Solution of Laplace's equation, which are continuous through the second derivative, are called
An image uses \(512 \times 512\) picture elements. Each of the picture elements can take any of the 8 distinguishable intensity levels. The maximum entropy associated with one image pixel will be
A baseband PCM system with a matched filter at the receiver is implemented with \(\pm 5\) V bipolar with a pulse duration of 72\(\mu\) sec. If the noise PSD is \(1.0 \times 10^{-4} V^2/Hz\), the probability of error in this system is given by
The image channel rejection in a superheterodyne receiver comes from