RRB JE Stage II exam is scheduled to be conducted from 28th August to 1st September2019. The overall merit for the selection will be made on the basis of the marks scored in stage II, so candidates need to prepare thoroughly for the second stage. To help the aspirants, Adda247 has come up with a study plan in which we will provide you daily quizzes of all technical subjects. The below quiz will be helpful for the candidates who opted Electronics as the exam group in RRB JE stage II.
Q1. Pressing Ctrl-Alt-Del will
(a) invoke a DOS transient routine
(b) delete a file
(c) reboot DOS without having to shut off the computer
(d) execute an application program
Sol. Ctrl-Alt-Delete is the combination of keyboard keys that the computer user can press at the same time to terminate an application task or to reboot the operating system.
Q2. 12 MHz clock frequency is applied to a cascaded counter of modulus-3 counter, modulus-4 counter and modulus-5 counter. What are the lowest output frequency and the overall modulus, respectively?
(a) 200 kHz, 60
(b) 1 MHz, 60
(c) 3 MHz, 12
(d) 4 MHz, 12
Q3. The range of voltages between VL(max) and VH(min) are ________.
(d) between 2 V and 5 V
Q5. In Troposphere scatter links, diversity system is made use of to
(a) increase the bandwidth
(b) increase the directivity of the antenna
(c) prevent noise effects
(d) detect signal in the presence of fading
Q6. If a sky wave with a frequency of 50 MHz is incident on the D-region at an angle of 30°, then the angle of refraction is
Q7. Which of the following scheme is a digital modulation technique?
(a) Pulse code modulation
(b) On-off keying
(c) Pulse width modulation and Delta modulation
(d)All of the above
Sol. Pulse code modulation, on-off keying and delta modulation; all these are digital modulation techniques.
Q8. Consider the following codes:
1. Hamming code
2. Huffman code
3. Shannon-Fano code
4. Convolutional code
Which of these are source codes?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 3 and 4 only
(d) 1, 2, 3 and 4
Sol. Hamming and convolution codes are error correcting codes.
Q9. PAM signals are constructed by using a low pass filter of pass band slightly greater than base band to avoid aliasing. This avoids distortion
(a) True for flat top pulses
(b) True if law pass filter has sharp cut-off
(c) Flat top pulses introduce envelope delay
(d) Flat top pulses introduce amplitude distortion and delay
Sol. In flat top pulses due to aperture effect amplitude distortion is found.
Q10. The average information associated with an extremely likely message is zero. What is the average information associated with an extremely unlikely message?
(c) Depends on total number of messages
(d) Depends on speed of transmission of the message
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