List of top Electronics and Communication Engineering Questions

A Reflex Klystron oscillator uses
In a commercial FM broadcasting the maximum frequency deviation is
A capacitor of \(0.5\,\mu F\) is used to tune a signal of \(200\,kHz\). The tuning frequency is
For M-ary PSK, the signal constellation is
The Nyquist sampling rate for a signal band limited to \(4\,kHz\) is
The modulation method that represents bits as different phase shifts of a carrier is
The data rate of a binary signal with a bit time 11.5 microseconds is
An AM wave is given by \(C(t)=10[1+0.4\cos(10^4 t)+0.3\cos(10^5 t)]\cos(10^6 t)\). The modulation index of the envelope is
The envelope detector is
The SSB-SC can be obtained from balanced modulator by connecting at its output a
Which of the following circuits is an indirect method of generating FM?
The function of a pre-emphasis circuit in a communication system is to boost
Turn-off of an SCR, it is necessary to reduce its current to less than
In a parallel inverter
A 1000 kHz carrier is simultaneously modulated with 300 Hz and 250 Hz audio waves. Which of the following frequencies will not be present in the output?
The working principle of SMPS is based on
The two transistors in a SCR consists of following transistors
Consider the following statements in respect to a solar cell (i) a solar cell is a large area p-n junction (ii) in a solar cell the p-n junction is near the surface (iii) a solar cell is a photovoltaic device Which of the statements given above are correct?
Correct Marks: 1 Wrong Marks: 0
Which of the following is active transducer?
What type of transducer is used to convert force into electrical signals?
The phenomenon of injection electro luminescence is the basis of working of
What is the function of a signal generator?
Which of the following can be used to produce a square waveform?
Which of the following signals are generated by Wien-bridge oscillators?
The characteristic equation of a closed loop control system is given as \(s^2 + 4s + 16 = 0\). The natural frequency in rad/s of the system is