List of practice Questions

Solution of Laplace's equation, which are continuous through the second derivative, are called
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
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
Match List-I (modulation/generation techniques) with List-II (disadvantages/generated signal) and select the correct answer from the given codes:
A 10 kW carrier is sinusoidally modulated by two carriers corresponding to a modulation index of 30% and 40%, respectively. The total radiated power is
The subsystems in an FM receiver are
A. Mixer
B. RF amplifier
C. Limiter
D. IF amplifier
Choose the correct sequence of subsystems in an FM receiver from the options given below:
The image channel rejection in a superheterodyne receiver comes from
Choose the correct statements from the following
A. The lag-compensation has a pole nearer to the origin.
B. The lag-compensation has a zero nearer to the origin.
C. The lag-compensator decreases the bandwidth.
D. The lag-compensator increases the bandwidth.
The damping ratio and undamped natural frequency of a closed loop system as shown in the figure, are denoted as \(\zeta\) and \(\omega_n\) respectively. The value of \(\zeta\) and \(\omega_n\) are:
(A) \(\zeta = 0.5\)
(B) \(\zeta = 0.707\)
(C) \(\omega_n = 10\) rad/s
(D) \(\omega_n = 100\) rad/s
Choose the correct answer from the options given below:
The Nyquist plot and step response/transfer function is given. Match List-I (Nyquist plot) with List-II (corresponding step response/transfer function).
In binary data transmission, DPSK is preferred over PSK because
Coherent demodulation of FSK signal can be detected using
Consider the signal x(t) shown in the figure. Let h(t) denote the impulse response of the filter matched to x(t), with h(t) being non-zero only in the interval 0 to 4 sec. The slope of h(t) in the interval 3 greater than t greater than 4 sec is
The Boolean function f implemented in the figure using two input multiplexers is
In the root locus plot, the breakaway points
A. Need not always be on the real axis alone.
B. Must lie on the root loci.
C. Must lie between 0 and -1.
Choose the correct answer from the options given below:
The value of the steady state error for first order system, \(\frac{1}{sT+1}\) with Unit Ramp Function will be
Which one of the following statements regarding the effect of the phase lead network is not correct?
Bounded-input bounded-output stability implies asymptotic stability for
A. Completely controllable system
B. Completely observable system
C. Uncontrollable system
D. Unobservable system
Which of the above statements is/are correct?
Choose the correct answer from the options given below:
A second order control system has a damping ratio \(\zeta = 0.8\) and the natural frequency of oscillation \(\omega_n = 12\) rad/sec. Determine the damped frequency of oscillation.
In the astable multivibrator circuit shown in the figure, the frequency of oscillation at the output is
An 8-bit ADC converts analog voltage in the range of 0 to +5 V to the corresponding digital code as per the conversion characteristics shown in the figure. For \(V_{in}\) = 1.9922 volt, which of the following digital output, given in hex, is true?
Neglecting the delays due to the logic gates in the circuit shown in the figure, the decimal equivalent of the binary sequence [ABCD] of initial logic states, which will not change with the clock, is
The maximum clock frequency in MHz of a 4-stage ripple counter, utilizing flip-flops, with each flip-flop having a propagation delay of 20 ns, is
It is desired to multiply the numbers 0AH by 0BH and store the result in the accumulator. The numbers are available in registers B and C, respectively. A part of the 8085 program for this purpose is given below: MVI A, 00H; Loop:---; ---; ---; ---. The sequence of remaining 4 instructions to complete the program would be
Negative feedback in amplifiers A. improves the signal-to-noise ratio at the input. B. improves the signal-to-noise ratio at the output. C. does not affect the signal-to-noise ratio at the output. D. reduces distortion. Choose the correct answer from the options given below: