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What is a crystal oscillator?
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Description :

crystal oscillator and its applications.

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.

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Description :

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

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 ) 

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Description :

In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: A) Half the total number of electrons in the crystal B) Zero C) Half the number of atoms in the crystal D) Half the number of free electrons in the crystal

Answer :

In a single crystal of an intrinsic semiconductor, the number of free carriers at the Fermi level at room temperature is: Zero 

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Description :

Write short notes on:  1) Phosphor characteristics  2) Liquid crystal display

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Description :

Liquid Crystal Display (LCD)

Answer :

Liquid Crystal Display (LCD) LCD stands for Liquid Crystal Display. It is a flat panel electronic display device which uses light modulating properties of liquid crystal. ... pixel and passive pixel display do not consist of switch at each pixel.

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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 

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 

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Description :

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

Answer :

A Hartley Oscillator is used for generating radio-frequency Oscillation

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Description :

Describe triggering of SCR using UJT relaxation oscillator. 

Answer :

Triggering of SCR using UJT relaxation oscillator: 

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Description :

Compare amplifier and oscillator.

Answer :

Figure shows a block diagram of an amplifier and an oscillator.   An amplifier is a device, which produces an output signal with similar waveform as that of the input. ... is supplied. An oscillator does not require any external signal to start or maintain energy conversion process.

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Description :

Compare RC and LC oscillator.

Answer :

 RC and LC oscillator

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Description :

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

Answer :

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

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Description :

Draw and explain Hartley Oscillator circuit diagram.

Answer :

Function of each component: 1. An NPN transistor connected in a common emitter configuration works as the active device in amplifier stage and CE configuration provides 180°phase shift. 2. R1 and R2 ... circuit to the base-emitter circuit.  The frequency of oscillation is given as-  

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Description :

Draw and explain RC phase shift Oscillator.

Answer :

Circuit diagram of RC phase shift oscillator: WORKING: * Circuit consists of a single stage amplifier in common emitter configuration & RC phase shifting network. * R1, R2, RE provides biasing & CE ... . * The phase shift around the loop is 3600 only at one precise frequency.  

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Description :

In an R-C phase shift oscillator, the minimum no. of R-C networks to be connected in cascade will be -

Answer :

In an R-C phase shift oscillator, the minimum no. of R-C networks to be connected in cascade will be 3

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Description :

Oscillator independent of phase shift is  (1) Relaxation (2) Wein bridge (3) Clapp (4) All of these

Answer :

Oscillator independent of phase shift is Relaxation 

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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

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

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Description :

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

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)

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Description :

Compare between RC phase shift oscillator and crystal oscillator.

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.

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Description :

List the applications of RC oscillator and crystal oscillator.

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. 

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Description :

Frequency stability of crystal oscillator is due to its  A) Low Q B) Low loss C) High feed back D) High bandwidth

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Description :

Answer :

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

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Answer :

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

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Description :

What type of defect causes F -centers in a crystal ?  (a) Stoichiometric defect (b) Metal excess defect due to anion vacancies (c) Metal excess defect due to extra cations (d) Frenkel defect

Answer :

Metal excess defect due to anion vacancies

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Description :

What is a clipping circuit?

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Description :

What is a diode clamper circuit?

Answer :

Tha faction of diode 

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Description :

What do you mean by biasing of a transistor?

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Description :

What is the frequency response of a circuit?

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Description :

What does it mean to analyze a circuit?

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Description :

What is DC analysis of a circuit?

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Description :

What is the use of diode in the circuit?

Answer :

Diode is a device which allows the flow of current in one direction and blocks the current in opposite direction.

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Description :

What is forward biased?

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Description :

What type of biasing is used in CE amplifier?

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Description :

What is emitter biasing?

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Description :

What is meant by feedback in electronics?

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Description :

What are oscillators in technical analysis?

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Description :

What is meant by 3db frequency?

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Description :

What do you mean by frequency response of an amplifier?

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Description :

What is the best frequency response?

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Description :

What is the advantage of differential amplifier?

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Description :

What is IC 555?

Answer :

Ic 555 is timer used for indicating time intervals which is settled in ic 

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Description :

What is the gain of an op amp?

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Description :

What is the power amplifier?

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Description :

What is the use of differential amplifier?

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Description :

What is IC 741?

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Description :

What is op amp and its application?

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Description :

What is the use of operational amplifiers?

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Description :

What is the meaning of operational amplifier?

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Description :

What is an example of an analog device?

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