What is mean by pulse width modulation?

by

1 Answer

Answer :

PWM means the width of pulse signal can be varied by varying ton & tOFF.
by

Related questions

What is pulse-width modulation (PWM) in Arduino?

Description : What is pulse-width modulation (PWM) in Arduino?

Last Answer : Pulse-width modulation (PWM) in Arduino is a technique used to control the brightness of an LED or the speed of a motor by varying the duty cycle of a digital signal.

What is a pulse-width modulation (PWM) signal in Arduino?

Description : What is a pulse-width modulation (PWM) signal in Arduino?

Last Answer : A PWM signal in Arduino is a digital signal that varies the width of the pulse to simulate an analog signal.

What is Pulse Width Modulation?

Description : What is Pulse Width Modulation?

Last Answer : Ans-Pulse width modulation is a modulation technique in which the width of the pulse is varied in accordance with the message signal. Pulse width Modulation is abbreviated as PWM. PWM can be used ... the pulse train and recover an average analog waveform. PWM is used in sound synthesis circuits.

Pulse width modulation may be generated:

Description : Pulse width modulation may be generated:

Last Answer : with a monostable multivibrator

A pulse modulation technique as the width of a constant amplitude pulse is varied proportional to the amplitude of the analog signal at the time the signal is sampled.

Description : A pulse modulation technique as the width of a constant amplitude pulse is varied proportional to the amplitude of the analog signal at the time the signal is sampled.

Last Answer : PWM, PLM, PDM

In single pulse modulation of PWM inverters, third harmonic can be eliminated if pulse width is

Description : In single pulse modulation of PWM inverters, third harmonic can be eliminated if pulse width is equal to   (a) 30o (b) 60o (c) 120o (d) 150o

Last Answer : In single pulse modulation of PWM inverters, third harmonic can be eliminated if pulse width is equal to 120o

A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty - cycle is equal to:

Description : A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty - cycle is equal to: A. 25% B. 50% C. 1% D. 100%

Last Answer : A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty - cycle is equal to:  25%

A technique used by codes to convert an analog signal into a digital bit stream is known as A) Pulse code modulation B) Pulse stretcher C) Query processing D) Queue management

Description : A technique used by codes to convert an analog signal into a digital bit stream is known as A) Pulse code modulation B) Pulse stretcher C) Query processing D) Queue management

Last Answer : Answer : A

Type of modulation used in TV broadcast visual transmitter. A. Pulse modulation B. DSBFC C. Vestigial sideband D. SSBFC

Description : Type of modulation used in TV broadcast visual transmitter. A. Pulse modulation B. DSBFC C. Vestigial sideband D. SSBFC

Last Answer : C. Vestigial sideband

Which of the following systems is not used in radio detection and ranging? A. Frequency shift B. Frequency modulation C. Pulse radar D. Amplitude modulation

Description : Which of the following systems is not used in radio detection and ranging? A. Frequency shift B. Frequency modulation C. Pulse radar D. Amplitude modulation

Last Answer : D. Amplitude modulation

Modulation in which no signal is present between pulses A. Pulse modulation B. QAM C. PSK D. FSK

Description : Modulation in which no signal is present between pulses A. Pulse modulation B. QAM C. PSK D. FSK

Last Answer : A. Pulse modulation

ECE Board Exam March 1996 Which of the following pulse modulation systems is analog? A. Delta B. Differential PCM C. PWM D. PCM

Description : ECE Board Exam March 1996 Which of the following pulse modulation systems is analog? A. Delta B. Differential PCM C. PWM D. PCM

Last Answer : C. PWM

ECE Board Exam March 1996 One type of pulse communications system uses pulse that appear as a group, and which vary in number according to the loudness of the voice. This type of pulse modulation is called A. pulse duration modulation B. pulse amplitude modulation C. pulse code modulation D. pulse position modulation

Description : ECE Board Exam March 1996 One type of pulse communications system uses pulse that appear as a group, and which vary in number according to the loudness of the voice. This type of ... A. pulse duration modulation B. pulse amplitude modulation C. pulse code modulation D. pulse position modulation

Last Answer : A. pulse duration modulation

ECE Board Exam March 1996 The modulation system used for telegraphy is A. frequency-shift keying B. two-tone modulation C. pulse-code modulation D. single-tone modulation

Description : ECE Board Exam March 1996 The modulation system used for telegraphy is A. frequency-shift keying B. two-tone modulation C. pulse-code modulation D. single-tone modulation

Last Answer : A. frequency-shift keying

What is the primary advantage of pulse-modulation systems?

Description : What is the primary advantage of pulse-modulation systems?

Last Answer : . Low susceptibility to noise.

Pulse-code modulation requires the use of approximations of value that are obtained by what process?

Description : Pulse-code modulation requires the use of approximations of value that are obtained by what process?

Last Answer : Quantization.

What is pulse-frequency modulation?

Description : What is pulse-frequency modulation?

Last Answer : A method of pulse modulation in which a modulating wave is used to frequency modulate a pulse-generating circuit

What is the main disadvantage of pulse-position modulation?

Description : What is the main disadvantage of pulse-position modulation?

Last Answer : It requires synchronization between the transmitter and receiver.

Which edges of the pulse can be modulated in pulse duration modulation?

Description : Which edges of the pulse can be modulated in pulse duration modulation?

Last Answer : Either, or both at the same time.

What characteristics of a pulse can be changed in pulse time modulation?

Description : What characteristics of a pulse can be changed in pulse time modulation?

Last Answer : The time duration of the pulses or the time of occurrence of the pulses.

What, if any, noise susceptibility advantage exists for pulse-amplitude modulation over analog amplitude modulation?

Description : What, if any, noise susceptibility advantage exists for pulse-amplitude modulation over analog amplitude modulation?

Last Answer : Both are susceptible to noise and interference

To ensure the accuracy of a transmission, what is the minimum number of times a modulating wave should be sampled in pulse modulation?

Description : To ensure the accuracy of a transmission, what is the minimum number of times a modulating wave should be sampled in pulse modulation?

Last Answer : 2.5 times the highest modulating frequency.

What action is necessary to impress intelligence on the pulse train in pulse modulation?

Description : What action is necessary to impress intelligence on the pulse train in pulse modulation?

Last Answer : Some characteristic of the pulses has to be varied.

Pulse – amplitude modulation signals are multiplexed by using

Description : Pulse – amplitude modulation signals are multiplexed by using

Last Answer : FET switches

A technique used by codes to convert an analog signal into a digital bit stream is known as a. Pulse code modulation b. Pulse stretcher c. Query processing d. Queue management

Description : A technique used by codes to convert an analog signal into a digital bit stream is known as a. Pulse code modulation b. Pulse stretcher c. Query processing d. Queue management

Last Answer : a. Pulse code modulation

A technique used by codes to convert an analog signal into a digital bit stream is known as a. Pulse code modulation b. Pulse stretcher c. Query processing d. Queue management

Description : A technique used by codes to convert an analog signal into a digital bit stream is known as a. Pulse code modulation b. Pulse stretcher c. Query processing d. Queue management

Last Answer : a. Pulse code modulation

A technique used by codes to convert an analog signal into a digital bit stream is known as a. Pulse code modulation b. Pulse stretcher c. Query processing d. Queue management

Description : A technique used by codes to convert an analog signal into a digital bit stream is known as a. Pulse code modulation b. Pulse stretcher c. Query processing d. Queue management

Last Answer : a. Pulse code modulation

Define pulse modulation. State its types.

Description : Define pulse modulation. State its types. 

Last Answer : Pulse Modulation - consists essentially of sampling analog information signals and then converting those samples into discrete pulses. OR It consists essentially of sampling analog information signals and then converting those ... PAM - PWM - PPM  ii) Digital Pulse Modulation - PCM - DM - ADM 

Indicate which of the following pulse modulation is analog

Description : Indicate which of the following pulse modulation is analog  a) PCM b) DPCM c) PWM d) Delta

Last Answer : Indicate which of the following pulse modulation is analog  a) PCM b) DPCM c) PWM d) Delta

In modulation technique, which of the following is referred to audible pitch? A. Width B. Frequency C. Harmonic D. Amplitude

Description : In modulation technique, which of the following is referred to audible pitch? A. Width B. Frequency C. Harmonic D. Amplitude

Last Answer : B. Frequency

What component in a blocking oscillator controls pulse width?

Description : What component in a blocking oscillator controls pulse width?

Last Answer : Transformer.

What controls transmitter pulse width?

Description : What controls transmitter pulse width?

Last Answer : The modulator.

What controls transmitter pulse width?

Description : What controls transmitter pulse width?

Last Answer : The modulator.

What width is the pulse radiated by fire-control tracking radar?

Description : What width is the pulse radiated by fire-control tracking radar?

Last Answer : Very narrow.

What term is used to describe the product of pulse width and pulse-repetition frequency?

Description : What term is used to describe the product of pulse width and pulse-repetition frequency?

Last Answer : Duty cycle.

It indicates what signal frequencies can be propagated through a given distance of fiber cable. ∙ A. Bandwidth Distance Product ∙ B. Pulse width dispersion ∙ C. Rise time ∙ D. Cutoff frequency

Description : It indicates what signal frequencies can be propagated through a given distance of fiber cable. ∙ A. Bandwidth Distance Product ∙ B. Pulse width dispersion ∙ C. Rise time ∙ D. Cutoff frequency

Last Answer : A. Bandwidth Distance Product

The width of the vertical sync pulse in the Philippine TV system is

Description : The width of the vertical sync pulse in the Philippine TV system is

Last Answer : 3H

The width of the vertical sync pulse in the Philippine TV system is

Description : The width of the vertical sync pulse in the Philippine TV system is

Last Answer : 3H

For the most Static RAM the write pulse width should be at least a) 10ns b) 60ns c) 300ns d) 1μs

Description : For the most Static RAM the write pulse width should be at least a) 10ns b) 60ns c) 300ns d) 1μs

Last Answer : b) 60ns

An eight stage ripple counter uses a flip-flop with propagation delay of 75 nanoseconds. The pulse width of the strobe is 50ns. The frequency of the input signal which can be used for proper operation of the counter is approximately (A) 1 MHz. (B) 500 MHz. (C) 2 MHz. (D) 4 MHz.

Description : An eight stage ripple counter uses a flip-flop with propagation delay of 75 nanoseconds. The pulse width of the strobe is 50ns. The frequency of the input signal which can be used for proper operation of the counter is approximately (A) 1 MHz. (B) 500 MHz. (C) 2 MHz. (D) 4 MHz.

Last Answer : Maximum time taken for all flip-flops to stabilize is 75ns x 8 + 50 = 650ns. Frequency of operation must be less than 1/650ns = 1.5 MHz.

A 3 -stage ripple counter has Flip Flop with propagation delay of 25 nsec and pulse width of strobe input 10

Description : A 3 -stage ripple counter has Flip Flop with propagation delay of 25 nsec and pulse width of strobe input 10 nsec. Then the maximum operating frequency at which counter operates reliably is

Last Answer : A 3 -stage ripple counter has Flip Flop with propagation delay of 25 nsec and pulse width of strobe input 10 nsec. Then the maximum operating frequency at which counter operates reliably is 12.67 MHz

i) State the significance of modulation index in AM transmission. ii) Explain the effect of modulation index on AM wave with waveforms.

Description : i) State the significance of modulation index in AM transmission. ii) Explain the effect of modulation index on AM wave with waveforms.

Last Answer : Significance of modulation index in AM transmission  It is used to determine the strength and quality of transmitted signal. If the modulation index is small, then the amount of variation in ... amplitude part of its information is lost in the process of modulation which is undesirable.

Compare AM with FM with respect to following points: a) Definition. b) Modulation index. c) Bandwidth. d) Side band.

Description : Compare AM with FM with respect to following points: a) Definition. b) Modulation index. c) Bandwidth. d) Side band.

Last Answer : Parameters AM FM Definition It is the process in which the amplitude of carrier signal is varied in accordance with the instantaneous value of modulating signal keeping frequency and ... frequency deviation. Side band There are two sidebands Infinite number of sideband

State the need of modulation in communication system.

Description : State the need of modulation in communication system.

Last Answer : Need of modulation:- 1. To reduce the height of antenna 2. To avoids mixing of signals 3. To increases the range of communication 4. To make multiplexing of maximum signal is possible 5. To improve the quality of reception

why equalizing pulses are needed. Draw the vertical synchronizing pulse structure.

Description : why equalizing pulses are needed. Draw the vertical synchronizing pulse structure.

Last Answer : The ½ line difference just prior to the start of serrated vertical pulse does not affect the horizontal deflection synchronization but it does affect the vertical synchronization and the interlaced scanning. The ... the vertical sync pulse to occur at the correct time after every field.

applications of : (1) Function generator (2) Video pattern generator (3) AF signal generator and (4) Pulse generator.

Description : applications of : (1) Function generator   (2) Video pattern generator (3) AF signal generator and (4) Pulse generator. 

Last Answer : 1) Function generator: i) As trouble shooting tool to different analog and digital circuits. ii) As a source of alignment of different receiver. iii) If rise time of square wave is ... trigger output, pulses are available. iii) The generator can be operated as free running generator.

A pulse radar has a pulse repetition frequency (PRF) of 3 KHz. If the radar is emitting at 10 GHz, what is the

Description :  A pulse radar has a pulse repetition frequency (PRF) of 3 KHz. If the radar is emitting at 10 GHz, what is the maximum unambiguous range for this radar? A) 5 Km B) 5 m C) 50 Km D) 15 m 

Last Answer :  A pulse radar has a pulse repetition frequency (PRF) of 3 KHz. If the radar is emitting at 10 GHz, what is the maximum unambiguous range for this radar? A) 5 Km B) 5 m C) 50 Km D) 15 m 

A pulse compression radar transmits an encoded pulse having a frequency chirp from 990 MHz to 1010 MHz

Description : A pulse compression radar transmits an encoded pulse having a frequency chirp from 990 MHz to 1010 MHz centred around 1 GHz. The range resolution capability of this radar is A) 7.5 m B) 7.5 Km C) 75 m D) 750 m 

Last Answer : A pulse compression radar transmits an encoded pulse having a frequency chirp from 990 MHz to 1010 MHz centred around 1 GHz. The range resolution capability of this radar is 7.5 m

A return echo arrives after the allocated pulse interval then

Description :  A return echo arrives after the allocated pulse interval then . (A) It will interfere with the operation of the transmitter (B) The receiver may be overloaded (C) It will not be received (D) The target will appear closer than it really is

Last Answer : A

For an SCR with turn-on time of 5 microsecond, an ideal trigger pulse should have

Description : For an SCR with turn-on time of 5 microsecond, an ideal trigger pulse should have   (a) short rise time with pulse width = 3 µsec (b) long rise time with pulse width = 6 µsec (c) short rise time with pulse width = 6 µsec (d) None of the above 

Last Answer : a