List of top Electronics and Communication Engineering Questions asked in TANCET

A digital filter with impulse response $ h[n] = 2^n u[n] $ will have a transfer function with a region of convergence.

The number of multipliers and delay elements required in the direct form II realization of $$ H(z) = \frac{1 + 0.5z^{-1} - 2z^{-2}}{1 + z^{-1} - 2z^{-2}} $$ 

Choose the minimum number of op-amps required to implement the given expression. $ V_o = \left[ 1 + \frac{R_2}{R_1} \right] V_1 - \frac{R_2}{R_1} V_2 $

Which of the following causal analog transfer functions is used to design causal IIR digital filter with transfer function? $$ H(z) = \frac{0.05z}{z-e^{-0.42}} + \frac{0.05z}{z-e^{-0.2}} $$ Assume impulse invariance transformation with \( T = 0.1 \, \text{s} \). 

In a PCM system, speech signal bandlimited to 4 kHz is sampled at 1.5 times Nyquist rate and quantized using 256 levels. The bit rate required to transmit the signal will be
In order to check the CLR function of a counter
It is desired to mask the higher order bits (D7-D4) of the data bytes in register C. consider the following set of 8085 instruction,
(i) MOV A, C
ANI FOH
MOV C, A
HLT
(ii) MOV A, C
MVI B, FOH
ANA B
MOV C, A
HLT
(iii) MOV A, C
MVI B, 0FH
ANA B
MOV C, A
HLT
(iv) MOV A, C
ANI 0FH
MOV C, A
HLT
For the given 8086 microprocessor instructions below, which is an invalid instruction?
Let an error control system uses (16, 3) block codes. The coding efficiency of the system will be
The Modulating frequency in narrow band frequency modulation is increased from 10 kHz to 20 kHz. The bandwidth is
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?
Which of these error-detecting codes enables to find double errors in Digital Electronic devices?
The orthogonal signals S1 and S2 satisfy the following relation.
In 8085 microprocessor, unfortunately, two address lines namely A13 and A6 have become faulty and are stuck at logic 0. Which of the following address locations cannot be accessed in the memory?
NRZ and QPSK are respectively
The instruction XLAT in 8086 microprocessor is used to
An AM modulator develops an unmodulated power output of 400W across a 50\(\Omega\) resistive load. The carrier is modulated by a single tone with a modulation index of 0.6. If this AM signal is transmitted, the power developed across the load is

Match the following: For 8086 microprocessor 

The modulation index of amplitude modulation system is limited to unity because
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.
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
In the absence of attenuation on the line \( (\alpha = 0) \), the Voltage Standing Wave Ratio (VSWR) is
A wave is incident at an angle of 30°, from air to Teflon. Find the angle of transmission. Given, \(\epsilon_r\) = 2.1, \(\mu_1 = \mu_2\)
Consider an air filled rectangular waveguide with a cross section of 5cm x 3cm. For this waveguide, the cut off frequency (in MHz) of \(TE_{21}\) mode is
Calculate the propagation constant \( \gamma \) for a conducting medium in which \(\sigma\) = 58 MS/m, \( \mu_r \) = 1 and f = 100 MHz.