Description : The modulation technique used by GSM cellular system A. Phase shift keying B. Frequency shift keying C. Gaussian minimum shift keying D. QAM
Last Answer : C. Gaussian minimum shift keying
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
Description : Describe amplitude shift keying (ASK) modulation with suitable circuit diagram.
Last Answer : Explanation:- ASK MODULATOR: The process where a binary information signal directly modulates the amplitude of an analog carrier. The digital signal is used to switch the carrier between amplitude levels is ... Block diagram of ASK Transmitter / ASK modulator:- Waveforms:-
Description : What type of modulation depends on the carrier-wave phase shift?
Last Answer : Phase.
Description : What is a simplified difference between Phase Shift Keying and Frequency Shift Keying?
Last Answer : answer:FSK adjusts the frequency, PSK adjusts the phase. We use nonstandard PSK in our work because we can design a pre-amp and amp around the one frequency and design a filter with broad Q in the range of ... said ;-) Here is a good reference with pictures. If you need more then look at fsk vs psk
Description : What term is used to describe a spread spectrum communications system in which a very fast binary bit stream is used to shift the phase of an RF carrier? A. Frequency hopping B. Direct sequence C. Binary phase-shift keying D. Phase compandored spread spectrum
Last Answer : B. Direct sequence
Description : If digitaldata rateof 9600 bps is encoded using 8-level phaseshift keying (PSK) method, the modulation rate is A. 1200 bands B. 3200 bands C. 4800 bands D. 9600 bands E. None of the above
Last Answer : 3200 bands
Description : Frequency shift keying is used mostly in: (1) Telegraphy (2) Telephony (3) Satellite communication (4) Radio transmission
Last Answer : Frequency shift keying is used mostly in: Telegraphy
Description : Name two methods of oscillator keying.
Last Answer : Plate keying and cathode keying.
Description : State the method used to increase the speed of keying in a cw transmitter.
Last Answer : Machine keying.
Description : Why is a high-gain transistor used in the phase-shift oscillator?
Last Answer : Because of the losses encountered in the RC networks.
Description : Which components provide the regenerative feedback signal in the phase-shift oscillator?
Last Answer : Resistor-capacitor networks.
Description : What are the two types of angle modulation?
Last Answer : Frequency and phase.
Description : What types of modulation are shipboard receive-only equipment designed to receive?
Last Answer : Fm or psk.
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
Description : What can be added to the basic two-cavity klystron to increase the amount of velocity modulation and the power output?
Last Answer : Intermediate cavities between the input and output cavities.
Description : Name the modulation system in which the frequency alternates between two discrete values in response to the opening and closing of a key?
Last Answer : . Frequency-shift keying.
Description : Which cavity of a three-cavity klystron causes most of the velocity modulation?
Last Answer : The middle cavity.
Description : What type of modulation do most analog fiber optic communications systems use?
Last Answer : Intensity modulation.
Description : Define modulation.
Last Answer : The process of varying one or more characteristics of an optical signal to encode and convey information.
Description : Which junction of the transistor in the common-emitter detector detects the modulation envelope?
Last Answer : Emitter-base junction
Description : How is the degree of modulation expressed in an fm system?
Last Answer : As the ratio of the frequency deviation to the maximum frequency deviation allowable.
Description : What characteristic of a carrier wave is varied in frequency modulation?
Last Answer : Instantaneous frequency.
Description : What is the primary advantage of pulse-modulation systems?
Last Answer : . Low susceptibility to noise.
Description : Pulse-code modulation requires the use of approximations of value that are obtained by what process?
Last Answer : Quantization.
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 : With a single modulating tone, what is the amplitude of the sideband frequencies at 100-percent modulation?
Last Answer : One-half the amplitude of the carrier.
Description : What is percent of modulation?
Last Answer : The depth or degree of modulation.
Description : How much must the fpa plate current vary to produce 100- percent modulation in a plate modulator?
Last Answer : Between 0 and nearly two times its unmodulated value.
Description : What is high-level modulation?
Last Answer : Modulation produced in the plate circuit of the last radio stage of the system.
Description : What is modulation?
Last Answer : Modulation is the impressing of intelligence on a transmission medium.
Description : What is amplitude modulation?
Last Answer : Any method of modulating an electromagnetic carrier frequency by varying its amplitude in accordance with the intelligence.
Description : The primary advantage of key-to-tape data entry system is A) A large percentage of editing can be performed at the time of data entry B) Key verification is easily performed C) The tape is reusable D) Keying errors can be detected as they occur.
Last Answer : Answer : C
Description : Another SEG function that allows a person to be superimposed on another scene. A. Visual effect B. Wiper C. Chroma keying D. Special effect generation
Last Answer : C. Chroma keying
Description : The system administrator in CRC a) He will be responsible for the maintenance and security in the functioning of the system by keeping secrecy of his own password and also ensuring proper maintenance ... and periodical Back-up/Restore of data and cleaning up of records. d) All the above
Last Answer : d) All the above
Description : The primary advantage of key-to-tape data entry system is a. A large percentage of editing can be performed at the time of data entry b. Key verification is easily performed c. The tape is reusable d. Keying errors can be detected as they occur
Last Answer : The tape is reusable
Description : A sales clerk at a checkout counter scanning a tag on an item rather than keying it into the system, is using - 1) Input automation 2) Item data automation 3) Scanning automation 4) Source data automation
Last Answer : 3) Scanning automation
Description : A sales clerk at a checkout counter scanning a tag on an item rather than keying it into the system, is using - 1 Input automation 2 Item data automation 3 Scanning automation 4 Source data automation
Last Answer : 3 Scanning automation
Description : n digital modulation, it is similar to standard amplitude modulation except there is only two amplitudes possible.
Last Answer : amplitude shift keying
Description : To increase the magnitude of a number by 23, you must shift the number how many times and in what direction?
Last Answer : Three to the left.
Description : How many FFs would be required for an 8-bit shift register?
Last Answer : Eight.
Description : What causes the specified condition to shift position?
Last Answer : The input, or clock pulse.
Description : Armature reaction in a dc motor causes a shift of the neutral plane in which direction?
Last Answer : Opposite the rotation.
Description : What is the difference between phase and frequency modulation? A. Is purely theoretical because they are the same in practice B. Lies in poorer audio response of phase modulation C. Lies in the different definitions of the modulation index D. Is too great to make two systems compatible
Last Answer : C. Lies in the different definitions of the modulation index