List of top Questions asked in Tamil Nadu Common Entrance Test

Let an error control system uses (16, 3) block codes. The coding efficiency of the system will be
What is the nature of radiation pattern of an isotropic antenna?
A direct sequence spread spectrum technique uses 10 flip-flop linear feedback shift register as PN code generator. The jamming margin produced by the system will be
Early effect in bipolar transistor is caused by
When an arbitrary length of any general transmission line, is terminated in an open circuit or a short circuit, its input impedance is determined completely by

Match the following: For 8086 microprocessor 

When mean optical power launched into an 8 km length of fiber is 12 \(\mu\)W, the mean optical power at the fiber output is 3 \(\mu\)W. Find the overall signal attenuation in dB
Which characteristic of PLL is defined as the range of frequencies over which PLL can acquire lock with the input signal?
Find the differential mode gain of differential amplifier with CMRR of 5200 and common mode gain of 0.015V/V
Moist soil has a conductivity of $\sigma = 10^{-3}$ S/m and $\epsilon_r = 2.5$. Find conduction current $J_c$. Given, $E = 6 \times 10^{-6} \sin 9 \times 10^{3} t$ V/m.
Which of these error-detecting codes enables to find double errors in Digital Electronic devices?
Which of the following statements is true about error detection techniques used on communications link?
NRZ and QPSK are respectively
On a radio frequency transmission line, the velocity of signals at a frequency of 125 MHz is \( 2.1 \times 10^8 \) m/sec. What is the wavelength of the signal on the line?

Parameters of the transistor shown in the circuit below are $\beta=100$, $I_{Cq} = 1$ mA. 
Input resistance $R_i$ of the circuit is:

For the circuit shown in the Figure below, \(g_m\) of the transistor is 

For the given 8086 microprocessor instructions below, which is an invalid instruction?
Find the operating region of N-channel MOSFET with VGS = 1.4V, VTN = 0.5V, VDS = 1.8V
Forward current of 75mA passes through a diode for a forward drop of 0.6V. Find the forward resistance of the diode.
High frequency response of CS amplifier has a Miller multiplier equal to
How many AND gates are required to construct a 4 - bit parallel multiplier if four 4-bit parallel binary adders are given?
The far field of an antenna varies with distance r as
Calculate the propagation constant \( \gamma \) for a conducting medium in which \(\sigma\) = 58 MS/m, \( \mu_r \) = 1 and f = 100 MHz.
Calculate the value of LSB and MSB of a 12-bit DAC for 10V.
Which of the following Light source is popularly used in optical communication?