menu search
person
Please log in or register to answer this question.
Draw the block diagram of PWM. List its advantages 
thumb_up_alt 0 like thumb_down_alt 0 dislike
5 views

1 Answer

Block diagram of PWM:-

image

Advantages of PWM:-

1. More immune to noise.

2. Synchronization between transmitter and receiver is not required.

3. Possible to separate out signal from noise.

thumb_up_alt 0 like thumb_down_alt 0 dislike
← Prev Question Next Question →

Related questions

Description :

Draw the circuit diagram of PWM using IC555. State its operation.

Answer :

Operation: i. The timer IC555 is operated in monostable mode. ii. The negative going carrier pulses are to the differentiator formed by R1 & C1. The differentiator produces sharp negative ... . Thus PWM signal is generated at the output pin (3) of IC555 as monostablemultivibrator. 

thumb_up_alt 0 like thumb_down_alt 0 dislike
5 views 1 answer
Description :

Draw the TRF receiver block diagram and explain its working. 

Answer :

Explanation:- 1. TRF receivers are simple and having high sensitivity. The AM transmission takes place in MW band and SW band. MW frequency range is 540KHz to 1640KHz. 2. ... power level to drive the loudspeaker. 7. The loudspeaker converts electrical signal into original sound information.

thumb_up_alt 0 like thumb_down_alt 0 dislike
4 views 1 answer
Description :

Draw the block diagram of AM transmitter, explain its operation.

Answer :

AM transmitter is of two types i)High Level AM Transmitter ii)Low Level AM Transmitter i) RF crystal oscillator: It is a source of carrier signal of desired frequency. The circuit is ... AM signal is then applied to the transmitting antenna which radiates this AM signal into air or space. 

thumb_up_alt 0 like thumb_down_alt 0 dislike
3 views 1 answer
Description :

Draw block diagram of FM receiver and explain the use of limiter circuit.

Answer :

Diagram Explanation Amplitude limiter: The function of amplitude limiter is to remove all amplitude variation of FM carrier voltage that may occur due to atmospheric disturbances. Use of amplitude limiter makes the system less noisy.

thumb_up_alt 0 like thumb_down_alt 0 dislike
5 views 1 answer
Description :

Draw and explain block diagram of electronic communication system.

Answer :

Block diagram of electronic communication system. Explanation Transducer: A transducer is usually required to convert the output of a source into an electrical signal that is suitable for ... etc. Output Transducer: The output transducer converts electrical signal in to sound signal.  

thumb_up_alt 0 like thumb_down_alt 0 dislike
52 views 1 answer
Description :

Draw block diagram of basic electronic communication system and state the function of each block.

Answer :

i) Input signal: - The information can be in the form of sound, picture or data coming from computer. ii) Input transducer: - it converts original information into equivalent electrical ... back to suitable form. vii) Output transducer: - It converts electrical signal into original form. 

thumb_up_alt 0 like thumb_down_alt 0 dislike
7 views 1 answer
Description :

Draw the block diagram of FM super heterodyne radio receiver with waveforms.

Answer :

block diagram of FM super heterodyne radio receiver

thumb_up_alt 0 like thumb_down_alt 0 dislike
3 views 1 answer
Description :

Define PAM, PWM, and PPM. Draw waveforms.

Answer :

Pulse amplitude modulation is defined as a process of varying the amplitude of the carrier pulse in accordance to the modulating signal variations. Pulse width modulation is defined as a ... of varying the position of the carrier pulse, in accordance to the modulating signal variations.

thumb_up_alt 0 like thumb_down_alt 0 dislike
6 views 1 answer
Description :

Explain loop antenna with neat sketch. Draw radiation pattern. State its advantages and applications.

Answer :

Loop antenna:-The single turn coil carrying RF current through it having length less than the wavelength.   Advantages:- 1. highly directive 2. Small size Applications:- 1. For direction finding 2. In portable receivers 3. In navigation 

thumb_up_alt 0 like thumb_down_alt 0 dislike
7 views 1 answer
Description :

Draw the structure of horn antenna and its radiation pattern. List its any two applications.

Answer :

The structure of horn antenna Radiation pattern of Horn Antenna Application:- i) Used at microwave frequency. ii) Used in satellite tracking 

thumb_up_alt 0 like thumb_down_alt 0 dislike
12 views 1 answer
Description :

Draw circuit diagram of transistor reactance modulator. Explain its working.

Answer :

Explanation- A reactance modulator is illustrated in figure. It is basically a standard commonemitter class A amplifier. Resistors R1 and R2 from a voltage divider to bias ... frequency, whereas a lower capacitance increases the frequency. The circuit produces direct frequency modulations.

thumb_up_alt 0 like thumb_down_alt 0 dislike
3 views 1 answer
Description :

Draw the circuit diagram of practical diode detector and explain its working. 

Answer :

Circuit diagram of practical diode detector:  Explanation- The circuit operates in the following manner- The diode has been reversed so that now the negative envelope is demodulated. Due to this ... to produce AGC voltage. The DC AGC voltage is proportional to the amplitude of AM signal. 

thumb_up_alt 0 like thumb_down_alt 0 dislike
1 view 1 answer
Description :

Draw the circuit diagram of limiter and explain its working.

Answer :

Circuit diagram of amplitude limiter:- Explanation:- 1. In frequency modulation, the signal amplitude is held constant while the carrier frequency is varied. 2. Any noise that contaminates ... V p-p instead of the alternately driven into saturation and cutoff, it limits the signal amplitude

thumb_up_alt 0 like thumb_down_alt 0 dislike
5 views 1 answer
Description :

Draw the diagram for PAM generation using transistors. Explain its working.

Answer :

Explanation:-1. Transistor Q1 is used in the active region so it has been provided with DC biasing to its base. 2. Modulating signal is applied to the base of transistor Q1 3. In the emitter of ... . 7. In the time interval between sampling pulses output is zero. Thus we get the output as PAM.

thumb_up_alt 0 like thumb_down_alt 0 dislike
2 views 1 answer
Description :

Draw the circuit diagram of varactor diode FM modulator and explain its working.

Answer :

Varactor diode modulator is the direct method of FM generation wherein the carrier frequency is directly varied by the modulating signal. A varactor diode is a semiconductor diode whose ... the magnitude of frequency change is proportional to the amplitude of the modulating signal voltage.

thumb_up_alt 0 like thumb_down_alt 0 dislike
4 views 1 answer
Description :

Draw block diagram of practical ABS system. State its advantages.

Answer :

Advantages: Anti-lock braking system (ABS) guarantees stable braking characteristics on all road surfaces, hence avoids overturning of the vehicle. ABS reduces friction on wheels and road, thus increases the ... effectively, then an experienced driver on the non ABS vehicle. Diagram : 

thumb_up_alt 0 like thumb_down_alt 0 dislike
102 views 1 answer
Description :

for Delta-Star connection of 3-phase transformer: i) Draw the connection diagram ii) List any two advantages of this connection iii) State its area of application. 

Answer :

Disadvantages: i) In this type of connection, the secondary voltage is not in phase with the primary. Hence it is not possible to operate this connection in parallel with star-star or delta-delta ... iv) As line current is equal to phase current the conductor size of winding should be large. 

thumb_up_alt 0 like thumb_down_alt 0 dislike
583 views 2 answers
Description :

Describe the block diagram of FM superhetrodyne receiver

Answer :

RF amplifier:- There are two important functions of RF amplifier: 1) To increase the strength of weak RF signal. 2) To reject image frequency signal. In FM broadcast the ... FM broadcast, the maximum modulating frequency is 15 kHz. Hence the audio amplifier must have large bandwidth.

thumb_up_alt 0 like thumb_down_alt 0 dislike
5 views 1 answer
Description :

Explain with block diagram of Armstrong method of FM generation.

Answer :

Explanation:- The crystal oscillator generates the carrier at low frequency typically at 1 MHz this is applied to the combining network and a 90o phase shifter. The modulating signal is passed through an ... power amplifier to raise the power level of the FM signal.  Phasor Diagram:-   

thumb_up_alt 0 like thumb_down_alt 0 dislike
9 views 1 answer
Description :

Describe the block diagram of basic communication system.

Answer :

Describe the block diagram of basic communication system.

thumb_up_alt 0 like thumb_down_alt 0 dislike
4 views 1 answer
Description :

Compare PAM, PWM, and PPM on the basis of i. Variable characteristics ii. Bandwidth iii. Information contained in iv. Transmitted power

Answer :

Compare PAM, PWM, and PPM on the basis of i. Variable characteristics ii. Bandwidth iii. Information contained in iv. Transmitted power

thumb_up_alt 0 like thumb_down_alt 0 dislike
1 view 1 answer
Description :

Draw and label the circuit diagram of ratio detector 

Answer :

Draw and label the circuit diagram of ratio detector  

thumb_up_alt 0 like thumb_down_alt 0 dislike
3 views 1 answer
Description :

Draw and explain the block diagram of washing machine. State advantages of automatic washing machine.

Answer :

Explanation: The washing machines use inverter control for both washing and spin-drying. Inverter control helps reduce wash/spin noise and vibration and enables a washing machine to adjust the amount of ... limit. Advantages: 1. Time Saving 2. Effective 3. Consume less power 4. Save water

thumb_up_alt 0 like thumb_down_alt 0 dislike
1.1k views 1 answer
Description :

Draw neat labelled constructional diagram of INKJET printer. Describe the function of each block. State two advantages.

Answer :

It is a non-impact printer. It provides letter quality printout than dot matrix printer. Its output is sharper than Dot matrix though its output quality is not to the same level of laser printer ... is compatible in quality to that of a laser printer. Faster when compared to Dot Matrix printers.

thumb_up_alt 0 like thumb_down_alt 0 dislike
1.5k views 1 answer
Description :

Define pre-emphasis. State its need. Draw the circuit of pre-emphasis.

Answer :

Definition- The artificial boosting of higher modulating frequencies to reduce the effect of noise is called as pre-emphasis. Need:- The artificial boosting of higher audio modulating ... by increasing the amplitude of modulating signal at higher frequencies. Circuit diagram 

thumb_up_alt 0 like thumb_down_alt 0 dislike
3 views 1 answer
Description :

Draw Yagiuda antenna with its radiation pattern.

Answer :

Construction of Yagi-Uda Antenna Radiation Pattern of Yagi-Uda Antenna

thumb_up_alt 0 like thumb_down_alt 0 dislike
4 views 1 answer
Description :

Draw block diagram of microcontroller based pick and place Robot. List the four movements required by this Robot.

Answer :

Diagram : Explanation: The robot has three axes about which motion can occur. Rotation in a clockwise or anti-clock wise direction of the unit on its base Arm extension or ... . The gripper can be opened or closed by the piston in a linear cylinder extending or retracting as.

thumb_up_alt 0 like thumb_down_alt 0 dislike
89 views 1 answer
Description :

Draw circuit diagram of voltage divider biasing list two advantages of voltage divider biasing of BJT.

Answer :

Two advantages of voltage divider biasing of BJT. 1. It is very simple method of transistor biasing. 2. The biasing conditions can be very easily set. 3. there is no loading of ... 5. The resistor RE introduces a negative feedback. So all the advantages of negative feedback are obtained. 

thumb_up_alt 0 like thumb_down_alt 0 dislike
632 views 1 answer
Description :

Draw block diagram of OTDR and explain its working.

Answer :

Block diagram of OTDR Working principle of OTDR: A light pulse is launched into the fiber in the forward direction from an injection laser using either a ... backscattered light is detected using avalanche photodiode receiver. Output of photodiode receiver drivers an integrator.

thumb_up_alt 0 like thumb_down_alt 0 dislike
13 views 1 answer
Description :

Draw the block diagram of TDMA system and explain its working.

Answer :

Block diagram of TDMA system:- OR Explanation:- In TDMA, each user has all the bandwidth, all the power and part of the time. It is frequently used with data and ... receives the bursts from all other earth stations and must select from them the traffic destined only for itself.

thumb_up_alt 0 like thumb_down_alt 0 dislike
12 views 1 answer
Description :

Draw the block diagram of PCM receiver with the help of relevant wave form and explain its working

Answer :

Block diagram of PCM receiver:- Explanation:- A PCM signal contaminated with noise is available at the receive input. The regeneration circuit at the receiver will separate PCM pulses from noise ... quantized PAM signal is passed through a low pass filter recovers the analog signal x (t).

thumb_up_alt 0 like thumb_down_alt 0 dislike
7 views 1 answer
Description :

Draw the block diagram of function generator and explain its working.

Answer :

Principle of operation of function generator: Function generator operates to produce different waveforms such as sine, square, triangular of adjustable frequency which is used to test ... whose frequency is determined by the magnitude of current supplied by constant current sources.

thumb_up_alt 0 like thumb_down_alt 0 dislike
14 views 1 answer
Description :

Draw block diagram for CNC drilling machine and explain its working.

Answer :

Block diagram consist of the following points:  Machine tool with DC servo motor as feedback element. The transducer is added as adaptive control application.  The auxiliary controller ... line.  The interrupt pulses are generated by TBG and supplied to computer through inter

thumb_up_alt 0 like thumb_down_alt 0 dislike
300 views 1 answer
Description :

Draw block diagram of pneumatic system showing its basic components. State the functions of control value and air actuator.

Answer :

Diagram : Control valve: - control and regulates the direction of flow and pressure etc. Air actuator: - Air cylinders and motors are used to obtain the required movements of direction flow.

thumb_up_alt 0 like thumb_down_alt 0 dislike
607 views 1 answer
Description :

Draw optical type pyrometer and list its advantages. 

Answer :

Diagram of optical pyrometer ➢ Advantages: - 1) Flexibility 2) Portability 3) Monitor the temperature of moving object 4) Simple assembling of the device enables easy use of it. ... without contacting the heated body. 7) Fast response. 8) High output signal and moderate cost. 

thumb_up_alt 0 like thumb_down_alt 0 dislike
3 views 1 answer
Description :

Draw the multistage amplifier circuit diagram using RC coupling. State its advantages.

Answer :

Advantages: 1. It has a wide frequency response. 2. For coupling the resistor and the capacitor are used and which are not expensive so the cost is low. 3. The circuit is very ... a wide frequency band. 5. It is high fidelity amplifier. 6. It provides less frequency distortion.

thumb_up_alt 0 like thumb_down_alt 0 dislike
30 views 1 answer
Description :

Draw the circuit diagram for Instrumentation amplifier using three OP-AMPs. State its advantages and applications.

Answer :

Application: 1. In Data acquisition from low output transducers such as strain gauges, Thermocouples, Wheatstone bridge measurements e.t.c 2. In Medical instrumentation, Navigation, Radar ... video data acquisition and imaging 5. High frequency signal amplification in cable RF systems 

thumb_up_alt 0 like thumb_down_alt 0 dislike
106 views 2 answers
Description :

while(1) { while(!go); done = 0; count = 0; i = 0; while(i < 64){ temp = A[i]; if((temp > 47) && (temp <58)) { count++; A[i] = temp - 48; } i = i + 1; } done = 1; }

thumb_up_alt 0 like thumb_down_alt 0 dislike
191 views 0 answers
Description :

State the need of AGC. List the different types of AGC with neat graph.

Answer :

Need of AGC:- The need or purpose of AGC circuit is to maintain the output voltage level (volume) of radio receiver constant over a wide range of RF input signal level.  AGC also helps to smooth out the rapid ... of AGC:- 1) Simple AGC 2) Delayed AGC Graphical representation of AGC:- 

thumb_up_alt 0 like thumb_down_alt 0 dislike
7 views 1 answer
Description :

Define fading? List the causes.

Answer :

The fluctuation in signal strength at a receiver, which is mainly due to the interference of two waves which left the same source but arrived at the destination by different paths, is known ... , such as irrigation, or from multiple transmission paths, irregular earth surfaces, and varying terrains.

thumb_up_alt 0 like thumb_down_alt 0 dislike
2 views 1 answer
Description :

List the types of FM detector. Explain any one of them.

Answer :

Types of FM detector:- 1. Simple slope detector 2. Balanced slope detector 3. Phase discriminator(Foster seely discriminator) 4. Ratio detector 5. PLL detector Simple ... . If the IF amplitude is sufficiently limited prior to reaching the PLL and the loop is properly compensated 

thumb_up_alt 0 like thumb_down_alt 0 dislike
3 views 1 answer
Description :

List the types of micro-strip antennas. Explain any one of them.

Answer :

List the types of micro-strip antennas are as fallows. 1) RECTANGULER 2) CIRCULER. 3) SQUARE . 4) ELIPTICAL. 5) TRINGULAR. Rectangular Micro-strip Antenna: Micro-strip ... mobile phone market. Patch antennas are low cost, have a low profile and are easily fabricated. 

thumb_up_alt 0 like thumb_down_alt 0 dislike
2 views 1 answer
Description :

List and explain the properties of quarter wave transformer.

Answer :

Properties of quarter wave transformer: 1. Impedance transfomation: it provides impedance transformation upto the highest frequencies and is compatible with transmission line. 2. Impedance inversion: if ZL is ... or step up transformer,depending on whether ZL IS greater than or less than ZO.

thumb_up_alt 0 like thumb_down_alt 0 dislike
3 views 1 answer
Description :

List the types of noise in communication system. Explain any one of them.

Answer :

Explanation of External Noise:- Atmospheric Noise:- Atmospheric noise or static is caused by lighting discharges in thunderstorms and other natural electrical disturbances occurring in the atmosphere ... between two or more paths, and results from the random fluctuations in the division. 

thumb_up_alt 0 like thumb_down_alt 0 dislike
9 views 1 answer
Description :

Draw practical set-up and explain the procedure to measure selectivity of radio receiver.

Answer :

Procedure to measure selectivity of radio receiver: Throughout the measurement the receiver is kept tuned to desired frequency 950 Khz. Now the generator output frequency is deviated below ... the generator output voltage is adjusted to get a standard 50 miliwatt receiver output power.

thumb_up_alt 0 like thumb_down_alt 0 dislike
2 views 1 answer
Description :

Draw the structure and state applications of: i) Ferrite loop (rod) antenna ii) Horn antenna

Answer :

Horn antenna: Application:- i) Used at microwave frequency. ii) Used in satellite tracking.  Ferrite loop antenna: Application:- In Am radio receiver to receive MW and SW band signals. In FM radio receiver

thumb_up_alt 0 like thumb_down_alt 0 dislike
4 views 1 answer
Description :

Draw construction of Yagi-Uda antenna and explain.

Answer :

Explanation A Yagi-Uda antenna, commonly known as a Yagi antenna, is a directional antenna consisting of multiple parallel elements in a line, usually half-wave dipoles made of ... receiver with a transmission line and additional parasitic elements called reflector and one or more directors.

thumb_up_alt 0 like thumb_down_alt 0 dislike
14 views 1 answer
Description :

Draw waveform for standing waves on an open and shorted line. Prove that impedance is inverted at every quarter wavelength interval.

Answer :

Waveform- Explanation When the transmission line is short circuited voltage is zero and current is maximum.The variation is according to the wavelength. When the ... The pattern repeats for every half wavelength. Thus impedance is inverted at every quarter wavelength interval.

thumb_up_alt 0 like thumb_down_alt 0 dislike
3 views 1 answer
Description :

In a FM system, the maximum deviation is 75KHz. Find bandwidth for modulating frequency i. fm=500Hz ii. fm=5KHz iii. fm=10KHz Draw conclusion for bandwidth of FM from answer.

Answer :

Given deviation∆=75kHz i) fm=500Hz bandwidth B.W=2(∆+fm)  =2(75k+500)=151kHz  ii). fm=5KHz bandwidth B.W=2(∆+fm)  =2(75k+5k)=160KHz iii) fm=10KHz bandwidth B.W=2(∆+fm)  =2(75k+10k)=170KHz As the modulating frequency increases bandwidth also increases.

thumb_up_alt 0 like thumb_down_alt 0 dislike
3 views 1 answer
Description :

Define the transmission line? Draw it‟s general equivalent circuit.

Answer :

Transmission line: A conductor or conductors designed to carry electricity or an electrical signal over large distances with minimum losses and distortion.  Equivalent circuit:

thumb_up_alt 0 like thumb_down_alt 0 dislike
9 views 1 answer
editAsk a Question
...