The crystal oscillator frequency is very stable due to

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

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An oscillator that uses crystal control should be A) Frequency stable B) useful only at low frequencies C) AVFO D) none of the above.

Description : An oscillator that uses crystal control should be A) Frequency stable B) useful only at low frequencies C) AVFO D) none of the above.

Last Answer : A) Frequency stable

In a radio transmitter, the frequency of the crystal oscillator will be stable for a long time if the quality factor

Description : In a radio transmitter, the frequency of the crystal oscillator will be stable for a long time if the quality factor of the crystal resonator is  (a) > 100 (b) > 500 (c) > 1000 (d) > 20000

Last Answer : In a radio transmitter, the frequency of the crystal oscillator will be stable for a long time if the quality factor of the crystal resonator is  > 1000

Refer to the deviation of the operating frequency of a crystal oscillator from its nominal value due to temperature variations. A. Drift B. Flash over C. Frequency deviation D. Deviation ratio

Description : Refer to the deviation of the operating frequency of a crystal oscillator from its nominal value due to temperature variations. A. Drift B. Flash over C. Frequency deviation D. Deviation ratio

Last Answer : A. Drift

Six (6) MHz crystal oscillator has a stability of 1 part in 106. The largest frequency error expected of this crystals A) 0.06 Hz B) 0.6 Hz C) 6 Hz D) 60 Hz.

Description : Six (6) MHz crystal oscillator has a stability of 1 part in 106. The largest frequency error expected of this crystals A) 0.06 Hz B) 0.6 Hz C) 6 Hz D) 60 Hz.

Last Answer : C) 6 Hz

What transmission method uses a stable cw reference oscillator, which is locked in phase with the transmitter frequency?

Description : What transmission method uses a stable cw reference oscillator, which is locked in phase with the transmitter frequency?

Last Answer : Pulse-Doppler.

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

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. 

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.

What is Miller crystal oscillator? Explain its operation.

Description : What is Miller crystal oscillator? Explain its operation.

Last Answer : It is nothing but a Hartley oscillator its feedback Network is replaced by a crystal. Crystal normally generate higher frequency reactance due to the miller capacitance are in effect between the transistor terminal.

State the basic principle of piezoelectric crystal and draw the circuit diagram of crystal oscillator.

Description : State the basic principle of piezoelectric crystal and draw the circuit diagram of crystal oscillator.

Last Answer : Basic Principle: The main principle of a piezoelectric crystal is that a mechanical force, when applied on the crystal, it vibrates and produces electric charges on the crystal surface. When ac voltage is applied across crystal, it vibrates at the frequency of the applied voltage. (OR)

Compare between RC phase shift oscillator and crystal oscillator.

Description : Compare between RC phase shift oscillator and crystal oscillator.

Last Answer : RC phase shift oscillator Crystal oscillator This oscillator is used for low frequency range. Quartz crystal is mainly used in radio-frequency (RF) oscillators Used resistor and capacitor ... RC network is used as feedback network. Crystal is connected in feedback.

crystal oscillator and its applications.

Description : crystal oscillator and its applications.

Last Answer : Need: Any circuit that generates an alternating voltage is called an oscillator. To generate ac Voltage, it takes energy from the dc source. 1. In some applications voltages of low frequency are required where ... generate clock in digital systems.  It is used as sweep circuits in TV and CRO.

List the applications of RC oscillator and crystal oscillator.

Description : List the applications of RC oscillator and crystal oscillator.

Last Answer : Applications of RC oscillator :  1) In AF signal generators 2) In radio transmitter & Receivers 3) Sine wave generator.  Applications of Crystal oscillator : 1) Electronic navigation systems 2) Frequency Synthesizers 3) Timing circuits (Clock) with high stability. 4) RADAR systems. 

Draw the circuit diagram of crystal oscillator and explain its working.

Description : Draw the circuit diagram of crystal oscillator and explain its working.

Last Answer : To excite a crystal for operation in the series-resonant mode it may be connected as a series element in a feedback path, the crystal impedance is the smallest and the amount of positive feedback is the largest. ... which is good.  The resonant frequency is given as  Fo = 1/( 2 π √LC ) 

The main advantage of crystal oscillator is that its output is:

Last Answer : The main advantage of crystal oscillator is that its output is: A Constant frequency range

Which of the following is a negative-resistance microwave device for oscillator applications?

Description :  Which of the following is a negative-resistance microwave device for oscillator applications? A) IMPATT Diode B) Gunn Diode C) Snap diode D) Schottky Diode 

Last Answer :  Which of the following is a negative-resistance microwave device for oscillator applications? A) IMPATT Diode B) Gunn Diode C) Snap diode D) Schottky Diode 

The basic Hartley oscillator uses:

Description : The basic Hartley oscillator uses: (1) One inductor and two capacitors (2) A centre tapped inductor and a capacitor (3) Two capacitors (4) Tickler coil 

Last Answer : The basic Hartley oscillator uses: A centre tapped inductor and a capacitor

Positive feedback is used in 1. Amplifier 2. Rectifier 3.Oscillator 4. Detector

Description : Positive feedback is used in 1. Amplifier 2. Rectifier 3.Oscillator 4. Detector 

Last Answer : Positive feedback is used in 1. Amplifier 2. Rectifier 3.Oscillator 4. Detector 

A Hartley Oscillator is used for generating

Description : A Hartley Oscillator is used for generating (A) very low frequency Oscillation (B) radio-frequency Oscillation (C) microwave Oscillation (D) audio-frequency Oscillation

Last Answer : A Hartley Oscillator is used for generating radio-frequency Oscillation

An Oscillator produces - - - oscillations

Last Answer : An Oscillator produces Undamped oscillations

(2) stabilise the colloid and prevent crystallisation Explanation: Gelatine, being a colloid, has the property of preventing crystallization. In ice lollies and icecream this is demonstrated by the formation of a very fine crystal structure on freezing. This goes much further in that gelatine stabilized icecream does not become grainy or sandy due to the slow crystallisation of lactose with time.

Description : (2) stabilise the colloid and prevent crystallisation Explanation: Gelatine, being a colloid, has the property of preventing crystallization. In ice lollies and icecream this is demonstrated by the formation ... does not become grainy or sandy due to the slow crystallisation of lactose with time.

Last Answer : Glycol is added to aviation gasoline because it - (1) reduces evaporation of petrol (2) increases efficiency of petrol (3) prevents freezing of petrol (4) reduces consumption of petrol

Line imperfection in a crystal is called

Last Answer : Line imperfection in a crystal is called edge dislocation.

What is the local oscillator (mixer) frequency of the satellite with an uplink frequency in GHz band? A. 3500 MHz B. 4500 MHz C. 2225 MHz D. 2555 MHz

Description : What is the local oscillator (mixer) frequency of the satellite with an uplink frequency in GHz band? A. 3500 MHz B. 4500 MHz C. 2225 MHz D. 2555 MHz

Last Answer : C. 2225 MHz

When measuring a transmitter’s frequency against a suitable standard, the frequency to be measured is taken from the A. oscillator stage B. intermediate amplifier C. buffer stage D. final RF stage

Description : When measuring a transmitter’s frequency against a suitable standard, the frequency to be measured is taken from the A. oscillator stage B. intermediate amplifier C. buffer stage D. final RF stage

Last Answer : D. final RF stage

An FM receiver whose intermediate frequency is 10.7 MHz, is experiencing image channel interference from a station transmitting on 121.1 MHz. If the local oscillator is tracking above, the receiver is tuned to A. 131.8 MHz B. 110.4 MHz C. 142.5 MHz D. 99.7 MHz

Description : An FM receiver whose intermediate frequency is 10.7 MHz, is experiencing image channel interference from a station transmitting on 121.1 MHz. If the local oscillator is tracking above, the receiver is tuned to A. 131.8 MHz B. 110.4 MHz C. 142.5 MHz D. 99.7 MHz

Last Answer : D. 99.7 MHz

One of the following is a possible cause for a slow drift of frequency in a self-exited transmitter oscillator circuits resulting to a poor frequency stability. A. Loose shielding B. Heating of capacitor in the oscillator C. Poor soldered connections D. Faulty capacitor, resistor, tubes or resistors

Description : One of the following is a possible cause for a slow drift of frequency in a self-exited transmitter oscillator circuits resulting to a poor frequency stability. A. Loose shielding B. ... capacitor in the oscillator C. Poor soldered connections D. Faulty capacitor, resistor, tubes or resistors

Last Answer : B. Heating of capacitor in the oscillator

How do you eliminate radio frequency variation of an oscillator transmitter caused by its supply voltage? A. Use new power supply B. Lossen power supply shielding C. Use of regulated power supply D. Use of high capacitor in the supply circuit

Description : How do you eliminate radio frequency variation of an oscillator transmitter caused by its supply voltage? A. Use new power supply B. Lossen power supply shielding C. Use of regulated power supply D. Use of high capacitor in the supply circuit

Last Answer : C. Use of regulated power supply

One of the following is a high powered RF ac basic transmitter that has two or more stages, the oscillator stage which determines the frequency opereation and RF amplifier stage orstages that develop the high power output. The purpose of which is to develop a good frequency stability. A. Goldsmith B. MOPA C. Alexanderson D. Hartley

Description : One of the following is a high powered RF ac basic transmitter that has two or more stages, the oscillator stage which determines the frequency opereation and RF amplifier stage orstages that develop the ... to develop a good frequency stability. A. Goldsmith B. MOPA C. Alexanderson D. Hartley

Last Answer : B. MOPA

One of the following is a possible cause of an abrupt frequency variation in a self exited transmitter oscillator circuits resulting to a poor frequency stability to hold a constant frequency oscillation. A. Heating and expansion of oscillator coil B. DC and RF ac heating of resistors which cause change in values C. Heating of capacitor in the oscillatorD. Loose connections in the oscillator, amplifier, or antenna circuits.

Description : One of the following is a possible cause of an abrupt frequency variation in a self exited transmitter oscillator circuits resulting to a poor frequency stability to hold a constant frequency ... capacitor in the oscillator D. Loose connections in the oscillator, amplifier, or antenna circuits.

Last Answer : D. Loose connections in the oscillator, amplifier, or antenna circuits.

Which of the following is one of the possible causes for a slow drift of frequency in a self exited transmitter oscillator circuits resulting to a poor frequency stability? A. Poor soldered connections B. Power supply voltage changes C. Loose connections in the oscillator, amplifier, or antenna circuits D. DC and RF heating of resistors, causing then to change values.

Description : Which of the following is one of the possible causes for a slow drift of frequency in a self exited transmitter oscillator circuits resulting to a poor frequency stability? A. Poor soldered connections ... , or antenna circuits D. DC and RF heating of resistors, causing then to change values.

Last Answer : D. DC and RF heating of resistors, causing then to change values.

What is the local oscillator frequency range commercial AM broadcast if it is equal to 455 KHz. A. 540 to 1600 KHz B. 0 to 1600 KHz C. 995 to 2055 KHz D. 0 to 455 KHz

Description : What is the local oscillator frequency range commercial AM broadcast if it is equal to 455 KHz. A. 540 to 1600 KHz B. 0 to 1600 KHz C. 995 to 2055 KHz D. 0 to 455 KHz

Last Answer : C. 995 to 2055 KHz

ECE Board Exam March 1996 What is the purpose of a beat frequency oscillator (BFO)? A. Aid in the reception of weak voice-modulated signals B. Generates a signal, whose frequency is the same as that of the intermediate frequency C. Generates a 1kHz note for Morse code reception D. Generates an output, whose frequency differs from that of the intermediate frequency by 1 kHz

Description : ECE Board Exam March 1996 What is the purpose of a beat frequency oscillator (BFO)? A. Aid in the reception of weak voice-modulated signals B. Generates a signal, whose frequency is the ... reception D. Generates an output, whose frequency differs from that of the intermediate frequency by 1 kHz

Last Answer : C. Generates a 1kHz note for Morse code reception

For an under damped harmonic oscillator, resonance A Occurs when excitation frequency is greater than undamped natural frequency B Occurs when excitation frequency is less than undamped natural frequency C Occurs when excitation frequency is equal to undamped natural frequency D Never occurs

Description : For an under damped harmonic oscillator, resonance A Occurs when excitation frequency is greater than undamped natural frequency B Occurs when excitation frequency is less than undamped natural frequency C Occurs when excitation frequency is equal to undamped natural frequency D Never occurs

Last Answer : C Occurs when excitation frequency is equal to undamped natural frequency

For an under damped harmonic oscillator, resonance a) occurs when excitation frequency is greater than undamped natural frequency b) occurs when excitation frequency is less than undamped natural frequency c) occurs when excitation frequency is equal to undamped natural frequency d) never occurs

Description : For an under damped harmonic oscillator, resonance a) occurs when excitation frequency is greater than undamped natural frequency b) occurs when excitation frequency is less than undamped natural frequency c) occurs when excitation frequency is equal to undamped natural frequency d) never occurs

Last Answer : c) occurs when excitation frequency is equal to undamped natural frequency

For an underdamped harmonic oscillator, resonance ______. (A) occurs when excitation frequency is greater than the undamped natural frequency (B) occurs when excitation frequency is less than the undamped natural frequency (C) occurs when excitation frequency is equal to the undamped natural frequency (D) never occurs

Description : For an underdamped harmonic oscillator, resonance ______. (A) occurs when excitation frequency is greater than the undamped natural frequency (B) occurs when excitation frequency is less than the ... ) occurs when excitation frequency is equal to the undamped natural frequency (D) never occurs

Last Answer : (C) occurs when excitation frequency is equal to the undamped natural frequency

For an under damped harmonic oscillator, resonance a) occurs when excitation frequency is greater than undamped natural frequency b) occurs when excitation frequency is less than undamped natural frequency c) occurs when excitation frequency is equal to undamped natural frequency d) never occurs

Description : For an under damped harmonic oscillator, resonance a) occurs when excitation frequency is greater than undamped natural frequency b) occurs when excitation frequency is less than undamped natural frequency c) occurs when excitation frequency is equal to undamped natural frequency d) never occurs

Last Answer : c) occurs when excitation frequency is equal to undamped natural frequency

Load regulation is a measure of a power supplies ability keep a constant output under conditions of changing A) Line voltage B) Current demand C) Temperature D) Oscillator frequency.

Description : Load regulation is a measure of a power supplies ability keep a constant output under conditions of changing A) Line voltage B) Current demand C) Temperature D) Oscillator frequency.

Last Answer : A) Line voltage

In a heterodyne-type frequency meter, what is the difference between the oscillator frequency and the unknown frequency?

Description : In a heterodyne-type frequency meter, what is the difference between the oscillator frequency and the unknown frequency?

Last Answer : Beat frequency.

What determines the frequency of a tunnel-diode oscillator?

Description : What determines the frequency of a tunnel-diode oscillator?

Last Answer : The tuned circuit or cavity frequency.

In an fm transmitter, when does an oscillator generate only a steady frequency?

Description : In an fm transmitter, when does an oscillator generate only a steady frequency?

Last Answer : When no modulation is present.

A superheterodyne radio receiver with an IF of 455KHZ is turned to 1000KHZ. Find: (i) Image frequency (ii) Local oscillator frequency

Description : A superheterodyne radio receiver with an IF of 455KHZ is turned to 1000KHZ. Find: (i) Image frequency (ii) Local oscillator frequency

Last Answer : Given Intermediate Frequency fi=455KHz Signal frequency =fs=1000KHz Local oscillator frequency fo=fs+fi  Fo=1000KHz+455KHz  =1455KHz Image frequency is the input frequency which produces the same intermediate frequency fsi=fs+2fi  =1000KHz+2*455KHz  =1910KHz 

Why should local oscillator frequency be greater than signal frequency in AM receiver? Also explain why IF has constant value?

Description : Why should local oscillator frequency be greater than signal frequency in AM receiver? Also explain why IF has constant value?

Last Answer : Reason for LO frequency to be greater than signal frequency The local oscillator frequency (f0) is made greater than signal frequency (Fs) in radio receiver: Local oscillator frequency range is 995 ... frequency of desired signal because the IF is constant and same for all the incoming RF signal.

A super heterodyne AM receiver is tuned to a station operating at 1200 KHz .Find local oscillator frequency and image frequency.

Description : A super heterodyne AM receiver is tuned to a station operating at 1200 KHz .Find local oscillator frequency and image frequency.

Last Answer : A super heterodyne AM receiver is tuned to a station operating at 1200 KHz Intermediate frequency is 455KHz. IF frequency=f0-fs Local oscillator frequency is f0=IF +fs=455K+1200K=1655kHz The image frequency which gives the same IF is f0+2*IF=2110KHz

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,

List two types of oscillator, which generates frequency in RF range.

Description : List two types of oscillator, which generates frequency in RF range.

Last Answer : Types of Oscillators generating frequencies in RF range: i) Hartley Oscillator ii) Colpitt’s Oscillator iii) Clapp Oscillator

Assertion (A) : Wein bridge oscillator is generally used as a variable audio frequency oscillator Reason (R) :

Description : Assertion (A) : Wein bridge oscillator is generally used as a variable audio frequency oscillator Reason (R) : by using either capacitor (or) resistor in one of the arms of the bridge, the frequency of a wein bridge oscillator ... C) (A) is true but (R) is false (D) (A) is false but (R) is true

Last Answer : Assertion (A) : Wein bridge oscillator is generally used as a variable audio frequency oscillator Reason (R) : by using either capacitor (or) resistor in one of the arms of the bridge, the frequency of a wein bridge oscillator ... ) (A) is true but (R) is false (D) (A) is false but (R) is true

Can MOSFET operate at very high frequency?

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

The multivibrator circuit which processes one stable state and one quasi stable is

Description : The multivibrator circuit which processes one stable state and one quasi stable is   (a) Astabel (b) Monostable (c) Bistable (d) Schmitt trigger circuit

Last Answer : The multivibrator circuit which processes one stable state and one quasi stable is Monostable 

In which region is the operating point stable in tunnel diodes?

Description : In which region is the operating point stable in tunnel diodes?  (1) Negative-resistance (2) Positive-resistance (3) Both negative- and positive-resistance (4) Neither negative- nor positive-resistance

Last Answer : In Negative-resistance region is the operating point stable in tunnel diodes.