1 Answer

Answer :

PWM means the width of pulse signal can be varied by varying ton & tOFF.
Like 0 like

Related Questions

Description : Pulse width modulation may be generated:

Last Answer : with a monostable multivibrator

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

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

Description : Explain the pulse width modulation technique for control of AC output voltage.

Description : In pulse code modulation the effect of quantization is to (a) remove noise (b) introduce additional noise (c) limit noise in the channel (d) remove noise in the limiter

Description : In digital modulation, if the phase in the received RF pulse is unknown (a) coherent detection can be used (b) coherent detection cannot be used (c) envelope detection cannot be used (d) non coherent techniques cannot be used

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%

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

Last Answer : Quantization.

Description : Pulse – amplitude modulation signals are multiplexed by using

Last Answer : FET switches

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

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

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

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

Last Answer : Very narrow.

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

Last Answer : . Low susceptibility to noise.

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

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

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

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

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

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.

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

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.

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.

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 

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

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

Last Answer : Transformer.

Description : What controls transmitter pulse width?

Last Answer : The modulator.

Description : What controls transmitter pulse width?

Last Answer : The modulator.

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

Last Answer : Duty cycle.

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

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

Last Answer : 3H

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

Last Answer : 3H

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

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.

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

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.

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.

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 

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

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

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

Description : A pulse transformer is used in a driver circuit to:  (A) Prevent DC triggering. (B) Shape trigger signal. (C) Generate high frequency pulses. (D) Provide isolation. 

Last Answer : b

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.

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

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

Description : Digital modulation can withstand channel noise and distortion better than analog schemes (a) as long as the channel noise is within limits (b) for any noise (c) for thermal noise only (d) statement is not true

Description :  AM transmitter has a carrier power of 30 W. The percentage of modulation is 85%. Calculate the total power : (A) 5.4 W (B) 40.8 W (C) 10.8 W (D) 20.4 W

Description : In an amplitude modulated wave. the value of V is max 10V and Vmin is 5V, then % modulation is : (A) 25% (B) 33.3% (C) 50% (D) 100%

Description : Which of the following modulation techniques is mostly used in inverters ?   (a) Pulse width modulation (b) Square wave output modulation (c) Both (a) and (b) (d) Neither (a) nor (b)

Description : What is the maximum data rate that can be transmitted using a QPSK modulation with a roll-off factor of 0.2 for a 36 MHZ transponder?  A) 7.2 Mbps B) 30 Mbps C) 43.2 Mbps D) 60 Mbps

Description : The ratio of the width to the height of the picture frame is called as A) Rastar B) Aspect Ratio C) Length Ratio D) Efficiency  

Last Answer : The ratio of the width to the height of the picture frame is called as Aspect Ratio

Show MoreNext Page → ← Prev Page