Analog communication systems
Previous year question paper with solutions for Analog communication systems
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- Justify Square law equation of AM.
- Why we apply pre-emphasis circuit in FM before transmission?
- Where we use Vestigial side band transmission technique and why?
- What is FM Capture effect?
- Briefly explain the PLL direct FM transmitter.
- What do you mean by double spotting?
- Write basic difference between low level and high level modulation.
- A single side band signal contains 1KW. How much power is contained in the side bands and how much in the carrier?
- Define noise and noise figure.
- What is signal to noise ratio? Why is it important in communication systems?
- Find the modulation index if a 10 V carrier is amplitude modulated by three different frequencies with amplitudes of 1V, 2V and 3V respectively.
- Give two advantages of SSB operation compared with full carrier amplitude modulation?
- An FM modulator has deviation sensitivity of 30 kHz/V and operates at a carrier frequency of 175 MHz. Find the output frequency for an instantaneous value of modulating signal equal to 150mV.
- What is pre emphasis and de emphasis?
- Is it possible to use class C amplifiers to amplify an AM signal? Explain your answer.
- Why do some superheterodyne receivers use an RF stage while others do not?
- List three types of analog pulse modulation. Which pulse modulation scheme is used as an intermediate step in creation of pulse code modulation?
- Compare AM and FM (3 points).
- What are high level and low level modulation systems?
- What does modulation actually do to message and carrier?
- What is Flicker?
- A 400w carrier is modulated to a depth of 75% .Calculate the total power in a modulated wave.
- What do you mean by sensitivity and selectivity?
- What is the purpose of squelch circuits?
- Which type of noise occurs in a pulse amplitude modulation?
- What frequency range of AM and FM. broadcast bands?
- Write disadvantages of SSB transmission.
- Explain Dynamic Range?
- Which type of filters used in pre-emphasis and de-emphasis?