Frequency shift keying is used mostly in:

Frequency shift keying is used mostly in: (1) Telegraphy (2) Telephony (3) Satellite communication (4) Radio transmission 
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Frequency shift keying is used mostly in: Telegraphy 

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What is a simplified difference between Phase Shift Keying and Frequency Shift Keying?

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

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

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

The modulation technique used by GSM cellular system A. Phase shift keying B. Frequency shift keying C. Gaussian minimum shift keying D. QAM

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

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

Phase-shift keying is similar to what other two types of modulation?

Description : Phase-shift keying is similar to what other two types of modulation?

Last Answer : Cw and frequency-shift keying.

Describe amplitude shift keying (ASK) modulation with suitable circuit diagram.

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:- 

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.

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

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

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

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

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

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

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

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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

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

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

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

State the method used to increase the speed of keying in a cw transmitter.

Description : State the method used to increase the speed of keying in a cw transmitter.

Last Answer : Machine keying.

Name two methods of oscillator keying.

Description : Name two methods of oscillator keying.

Last Answer : Plate keying and cathode keying.

For biomedical applications the mostly used amplifier is ...

Description : For biomedical applications the mostly used amplifier is  A) Single ended amplifier B) Differential amplifier  C) Inverting operational amplifier D) Chopper amplifier

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What ammeter is mostly used in measuring high frequency currents?

Description : What ammeter is mostly used in measuring high frequency currents?

Last Answer : thermocouple

Mostly ________ is used in wireless LAN. a) time division multiplexing b) orthogonal frequency division multiplexing c) space division multiplexing d) channel division multiplexing

Description : Mostly ________ is used in wireless LAN. a) time division multiplexing b) orthogonal frequency division multiplexing c) space division multiplexing d) channel division multiplexing

Last Answer : b) orthogonal frequency division multiplexing

If the body undergoes alkalosis the respiratory center located in the medulla gets the information and induces the lowering of the respiratory frequency. The reduction of the respiratory frequency makes the body retain more carbon dioxide and to shift the equilibrium of the formation of bicarbonate towards the production of more hydrogen ions and thus the blood pH lowers.

Description : If the body undergoes alkalosis the respiratory center located in the medulla gets the information and induces the lowering of the respiratory frequency. The reduction of the respiratory frequency makes ... of bicarbonate towards the production of more hydrogen ions and thus the blood pH lowers.

Last Answer : What is the difference between respiratory acidosis and metabolic acidosis and what is the difference between respiratory alkalosis and metabolic alkalosis?

If the body experiences acidosis the respiratory center located in the medulla gets the information and induces the increase of the respiratory frequency. The increment of the respiratory frequency makes the body eliminate more carbon dioxide and to shift the equilibrium of the formation of bicarbonate towards the spending of more hydrogen ions and thus the blood pH raises.

Description : If the body experiences acidosis the respiratory center located in the medulla gets the information and induces the increase of the respiratory frequency. The increment of the respiratory frequency makes the ... of bicarbonate towards the spending of more hydrogen ions and thus the blood pH raises.

Last Answer : How does the breathing process correct alkalosis?

What type of transmission is radiated from an aircraft’s radio altimeter antenna? A. An amplitude modulated continuous wave B. A pulse position modulated UHF signal C. A differential phase shift keyed UHF signal D. A frequency modulated continuous wave

Description : What type of transmission is radiated from an aircraft’s radio altimeter antenna? A. An amplitude modulated continuous wave B. A pulse position modulated UHF signal C. A differential phase shift keyed UHF signal D. A frequency modulated continuous wave

Last Answer : D. A frequency modulated continuous wave

Assume a frequency of 4 MHz, determine the phase shift offered by the line in the above problem. A. 108.5˚ B. 106.5˚ C. 115.5˚ D. 166.5˚

Description : Assume a frequency of 4 MHz, determine the phase shift offered by the line in the above problem. A. 108.5˚ B. 106.5˚ C. 115.5˚ D. 166.5˚

Last Answer : D. 166.5˚

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

The Doppler Effect predicts that the spectrum of light from a visible body moving AWAY from the Earth will experience a shift in frequency when viewed from Earth. This particular shift is known as the: w) Blue shift x) Neutral shift y) Red shift z) Dirac shift

Description : The Doppler Effect predicts that the spectrum of light from a visible body moving AWAY from the Earth will experience a shift in frequency when viewed from Earth. This particular shift is known as the: w) Blue shift x) Neutral shift y) Red shift z) Dirac shift

Last Answer : ANSWER: Y -- RED SHIFT

Draw the labeled circuit of RC phase shift oscillator. State the formula for frequency of oscillator.

Description : Draw the labeled circuit of RC phase shift oscillator. State the formula for frequency of oscillator.

Last Answer : Frequency of oscillation is given by,

What is the frequency range of VHF electromagnetic waves?

Description : What is the frequency range of VHF electromagnetic waves? A) 30-300 kHz B) 30-3000 kHz C) 30-300 MHz D) 30-3000 MHz

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In a full wave rectifier with input frequency of 50 Hz, the frequency of the output is:

Description : In a full wave rectifier with input frequency of 50 Hz, the frequency of the output is: (1) 50 Hz (2) 100 Hz (3) 150 Hz (4) 200 Hz

Last Answer : In a full wave rectifier with input frequency of 50 Hz, the frequency of the output is: 100 Hz

Two sinusoidal signals having the same amplitude and frequency are applied to the X and Y inputs of a CRO.

Description : Two sinusoidal signals having the same amplitude and frequency are applied to the X and Y inputs of a CRO. The observed Lissajous figure is straight line. The phase shift between the two signals would be (1) Zero (2) 90 degrees (3) Either zero or 180 degrees (4) Either 90 degrees or 270 degrees  

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An FM signal with modulation index mƒ is passed through a frequency tripler. The modulation index of the

Description : An FM signal with modulation index mƒ is passed through a frequency tripler. The modulation index of the output signal will be (1) mƒ (2) 3mƒ (3) 9mƒ (4) 27mƒ

Last Answer : An FM signal with modulation index mƒ is passed through a frequency tripler. The modulation index of the output signal will be 3mƒ

Each flip-flop in a 4-bit ripple counter introduces a maximum delay of 40 n sec. The maximum clock frequency

Description : Each flip-flop in a 4-bit ripple counter introduces a maximum delay of 40 n sec. The maximum clock frequency is (a) 2.65 MHz (b) 6.25 MHz (c) 5.26 MHz (d) 6.52 MHz 

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Which of the following oscillators is used for generation of high frequency signal ?

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In a transistor Colpitts oscillator, C1 = 0.001 µF, C2 = 0.01 µF and L = 5 µH. The frequency of oscillation in

Description : In a transistor Colpitts oscillator, C1 = 0.001 µF, C2 = 0.01 µF and L = 5 µH. The frequency of oscillation in MHz will be (a) 2.37 MHz (b) 10.00 MHz (c) 11.54 MHz (d) 9.09 MHz 

Last Answer : c

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Description : The values of L and C for a low pass filter with cut off frequency of 2.5 KHz and operating with a terminated load resistance of 450 Ohm are given by  (a) 57.3 mH; 0.283 μF (b) 28.66 μH; 0.14 μF (c) 114.64 mH; 0.566 mF (d) 50.23 mH; 0.632 mF

Last Answer : The values of L and C for a low pass filter with cut off frequency of 2.5 KHz and operating with a terminated load resistance of 450 Ohm are given by 57.3 mH; 0.283 μF

Beta cut-off frequency of a transistor is the frequency at which the Beta is

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Low pass filter with cut off frequency of 100 kHz and high pass filter with cut off frequency of

Description : Low pass filter with cut off frequency of 100 kHz and high pass filter with cut off frequency of 50 kHz are connected in tandem, the resultant filter is Low pass filter with cut off frequency of 100 kHz ... kHz Band pass filter with pass band from 50 kHz to 100 kHz. None of the above.

Last Answer : Low pass filter with cut off frequency of 100 kHz and high pass filter with cut off frequency of 50 kHz are connected in tandem, the resultant filter is Band pass filter with pass band from 50 kHz to 100 kHz.

The frequency stability of the oscillator output is maximum in _____.

Description : The frequency stability of the oscillator output is maximum in _____.   (a) Crystal oscillator (b) Phase shift oscillator (c) LC oscillator (d) Wien bridge oscillator 

Last Answer : The frequency stability of the oscillator output is maximum in Crystal oscillator. 

The frequency of carrier in the carrier current pilot scheme is :

Description : The frequency of carrier in the carrier current pilot scheme is : (A) 1 kHz to 10 kHz (B) 25 kHz to 50 kHz (C) 10 kHz to 25 kHz (D) 50 kHz to 500 kHz

Last Answer : The frequency of carrier in the carrier current pilot scheme is : 50 kHz to 500 kHz

For FM signal, the frequency deviation

Description : For FM signal, the frequency deviation

Last Answer : For FM signal, the frequency deviation Independent of the modulation frequency

A 4 GHz carrier is amplitude modulated by a low-pass signal of maximum cut off frequency 1 MHz

Description : A 4 GHz carrier is amplitude modulated by a low-pass signal of maximum cut off frequency 1 MHz. lf this signal is to be ideally sampled, the minimum sampling frequency should be nearly

Last Answer : A 4 GHz carrier is amplitude modulated by a low-pass signal of maximum cut off frequency 1 MHz. lf this signal is to be ideally sampled, the minimum sampling frequency should be nearly 4 Ghz

In a 741 Op-Amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to the

Description : In a 741 Op-Amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to the (A) applied load (B) internal compensation (C) impedance of the source (D) power dissipation in the chip

Last Answer : In a 741 Op-Amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to the internal compensation

An accelerometer has input range of 0 to 10g, natural frequency 30 Hz and mass 0.001 kg. The range of the

Description : An accelerometer has input range of 0 to 10g, natural frequency 30 Hz and mass 0.001 kg. The range of the secondary displacement transducer in mm required to cover the input range is (A) 0 to 2.76 (B) 0 to 9.81 (C) 0 to 11.20 (D) 0 to 52.10

Last Answer : An accelerometer has input range of 0 to 10g, natural frequency 30 Hz and mass 0.001 kg. The range of the secondary displacement transducer in mm required to cover the input range is 0 to 2.76

Feedback factor at the frequency of oscillation of a Wien bridge oscillator is:

Description : Feedback factor at the frequency of oscillation of a Wien bridge oscillator is:  (1) 3 (2) 1/3 (3) 1/29 (4) 3/29

Last Answer : Feedback factor at the frequency of oscillation of a Wien bridge oscillator is: 1/3.

A series RLC circuit has a resonant frequency of 1 KHz and a quality factor Q = 100. If each of the R,L and C...

Description : A series RLC circuit has a resonant frequency of 1 KHz and a quality factor Q = 100. If each of the R,L and C is doubled from its original value, the new Q of the circuit is:  (1) 25 (2) 50 (3) 100 (4) 200

Last Answer : A series RLC circuit has a resonant frequency of 1 KHz and a quality factor Q = 100. If each of the R,L and C is doubled from its original value, the new Q of the circuit is: 200.

If Ф = angle(G(jw)H(jw)) where w is the gain crossover frequency of Bode plot of the system, phase margin is ...

Description : If Ф = angle(G(jw)H(jw)) where w is the gain crossover frequency of Bode plot of the system, phase margin is  A) -180+ Ф B) 180- Ф C) 180+ Ф D) -180- Ф

Last Answer : Ans:Option C

The frequency modulated (FM) radio frequency range is nearly

Last Answer : The frequency modulated (FM) radio frequency range is nearly 90 - 105 MHz.

Frequency in the UHF range propagate by means of

Last Answer : Frequency in the UHF range propagate by means of Space waves.

Tuned amplifiers are used for - - - - frequency amplification

Last Answer : Tuned amplifiers are used for Radio frequency amplification

Frequency modulation gives - - - noise

Last Answer : Frequency modulation gives Less noise

The crystal oscillator frequency is very stable due to

Last Answer : The crystal oscillator frequency is very stable due to High Q of the crystal.

Can MOSFET operate at very high frequency?

Last Answer : Yes MOSFET can operate at very high frequency.