State the need of tuned amplifier in electronic circuits.

2 Answers

Answer :

Need of tuned amplifier:

i. Selects the desired radio frequency signal.

ii. Amplifies the selected high or radiosignal to a suitable voltage level.

iii. As a filter.


Answer :

Necessity of tuned amplifier:

1. Selection of the desired radio frequency signal.

2. Amplification of the selected signal to a selected voltage level.

Related questions

Description : Explain stagger tuned amplifier with the help of waveforms.

Last Answer : Circuit Diagram: Above figure shows two-stage tuned voltage amplifier. The stagger tuning in this circuit, may be achieved by resonating the tuned circuits L1C1 and L2C2 to slightly different ... outside the pass-band. Because of the stagger tuning there is a loss of voltage gain.

Description : Describe the operation of double tuned amplifier with the help of neat circuit diagram and mention its applications.

Last Answer : Circuit diagram: Operation:  *The signal to be amplified is applied at the input terminal through the coupling capacitor CC  *The resonant frequency of the tuned circuit L1 C1 is made equal ... : (i) Radio and T .V broadcasting as tuning circuit. (ii) Wireless communication system.

Description : Sketch circuit diagram of common source FET Amplifier. State working principle of it.

Last Answer : Working: -  * When small a.c. signal is applied to the gate, it produces variation in the gate to source voltage. This produces variation in the drain current. As the gate to source ... and we get amplification. Thus the AC output voltage VDS is 180º out of phase with AC input voltage.

Description : State advantages of negative feedback used in feedback amplifier.

Last Answer : Advantage of negative feedback amplifier: * Increased stability in gain * Increased bandwidth * Less amplitude and harmonic distortion * Decreased noise * Less frequency distortion * Less non-linear distortion * Input and output resistance can be modified as desired

Description : The electronic circuits which implement the various logic operations are called ________ (a) Logic gates (b) Boolean algebra (c) amplifier gain (d) logic functions

Last Answer : a) Logic gates

Description : Draw the circuit of complementary, symmetry push pull amplifier and explain its working.

Last Answer : COMPLEMENTRY SYMMETRY CLASS B PUSH PULL AMPLIFIER  Circuit Diagram:  Circuit description: * Two transistors one NPN & other PNP is used in the circuit so they are complementary to each other. ... conducts & NPN remains OFF.  So we get remaining half cycle in the output.

Description : Explain with circuit diagram and waveform the operation of class AB push pull power amplifier.

Last Answer : Class AB Push Pull Power Amplifier:  Circuit Diagram:  Circuit Decription: The circuit consists of two centre-tapped transformers T1 and T2, two identical transistors Q1 and Q2 , Resistor R and ... two halves & produces a full sine wave in the load resistor. Waveform :

Description : Define the term related to power amplifier. (i) Efficiency (ii) Voltage gain

Last Answer : (i) Efficiency: Efficiency of the power amplifier is defined as the ratio of maximum a.c. output power to the d.c. input power. Mathematically (ii) Voltage gain: Voltage gain of the power amplifier is defined as the ratio of output voltage to the input voltage. Mathematically,

Description : Explain principle of feedback amplifier.

Last Answer : Block diagram of feedback amplifier:- Explanation:- * Feedback is a process of injecting some energy from the output and then it back to the input. The amplifier which use the feedback principle are ... Now, The quantity β = Vf /Vo is called as feedback ratio or feedback fraction.

Description : With the help of neat circuit diagram, explain the operation of voltage shunt type feedback amplifier.

Last Answer : Diagram:  Fig. shows common emitter transistor amplifier with a feedback resistor RF connected between its output and input terminals. This is collector to base biasing when the input signal is ... As IS = If + Ii it is shunt type therefore it voltage shunt negative feedback amplifier.

Description : Draw the circuit diagram of class AB power amplifier and describe its working.

Last Answer : Circuit diagram: Circuit Description: The circuit consists of two center-tapped transformers T1 and T2, two identical transistors Q1 and Q2 , Resistor R and diode D. The DC voltage ... and Q2 conduct, as soon as input cross zero, negative sinusoidal voltage will appear across load.

Description : Describe the operation of class-C type of power amplifier with the help of neat sketch.

Last Answer : Circuit diagram: Operation: * Class C power amplifier is a type of amplifier where the transistor conducts for less than one half cycle of the input signal. Less than one ... resonant circuit oscillates in one frequency (generally the carrier frequency) all other frequencies are attenuated. 

Description : Compare small signal amplifier with power amplifier

Last Answer : Parameters Small signal Amplifiers Power Amplifiers Amplification quantity It increases voltage into high resistance load. Hence small signal amplifiers are also called as voltage amplifiers. It ... Coupling R-C coupling Transformer coupling Power output low High

Description : List the types of coupling used in BJT amplifier. 

Last Answer : Types of coupling used in BJT amplifier: i. Resistance capacitance (RC)coupling ii. Impedance coupling iii. Transformer coupling iv. Direct coupling

Description : What is the need for a tuned amplifier?

Last Answer : In radio or TV receivers , it is necessary to select a particular channel among all other available channels.Hence some sort of frequency selective circuit is needed that will allow us to amplify ... and reject all the other unwanted signals and this function is provided by a tuned amplifier.

Description : Draw the circuit of single tuned amplifier and state its operating principle.

Last Answer : Operating Principle: The working of tuned voltage amplifier may be understood by considering a radio frequency signal, to be amplified applied at the input of the amplifier. The resonant frequency ... will be amplified. And all the other frequencies will be rejected by the tuned circuit. 

Description : How many tuned parallel LC circuits are shown in this schematic?

Last Answer : Four.

Description : Give the classification of tuned amplifier

Last Answer : (i) Small signal tuned amplifier *Single tuned *Double tuned *Stagger tuned (ii) Large signal tuned amplifier.

Description : Which of the following methods cannot be used to increase the bandwidth for cascaded RF amplifier stages? A) Wave traps in each stage B) Stagger tuning C) A shunt damping resistor across each tuned circuit D) Doubled tuned transformers with tighter coupling

Last Answer : A) Wave traps in each stage

Description : Which of the following circuit would be preferred for a 455 kHz IF amplifier? A) A resistance loaded B) Double tuned transformer C) Video amplifier D) Class C

Last Answer : B) Double tuned transformer

Description : Sketch the single tuned amplifier.

Last Answer : single tuned amplifier

Description : role of tuned LC circuit in tuned amplifier.

Last Answer : In order to pick up and amplify the desired radio frequency signal, the resistive load in the audio amplifier is replaced by a tuned circuit (also called a parallel resonant circuit)as shown ... desired radio frequency signal. (ii)Amplification of the selected signal to a suitable voltage level.

Description : The schematic diagram shown in the illustration represents which of the listed solid-state circuits? EL-0069 A. Bridge rectifier B. Magnetic amplifier C. Flip-flop generator D. Cathodic amplifier

Last Answer : Answer: A

Description : Electric circuits are protected against overloads and short circuits by means of a/an ______________. A. circuit breaker B. amplifier C. diode D. capacitor

Last Answer : Answer: A

Description : To provide its unique characteristics to analog circuits, the operational amplifier is made up of a/an ______________. A. voltage amp, current amp and output amp B. input amp, power amp and output amp C. scaling amp, power amp and voltage amp D. differential amp, voltage amp and output amp

Last Answer : Answer: D

Description : RC time constant characteristics, as shown in the illustration, are important in _____________. EL-0086 A. bridge rectifiers for alternator excitation B. timing and pulse shaping circuits C. transistor power amplifier biasing D. motor controller overload protection

Last Answer : Answer: B

Description : Electrical circuits are protected against overheating by means of a/an ______________. A. circuit breaker B. amplifier C. diode D. capacitor

Last Answer : Answer: A

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.

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.

Description : What is the major factor that limits the high-frequency response of an amplifier circuits?

Last Answer : The capacitance of the circuit.

Description : Non-inverting amplifier circuits have _______ (a) Very high input impedance (b) very low input impedance (c) low output impedance (d) none of above

Last Answer : (a) Very high input impedance

Description : Justify the need of current time base generator to obtain the specified sawtooth waveform with one example.

Last Answer : Justification:- * Current Time base generator is a circuit where the output current is a linear function of time over a specified time interval. * Time base circuits are used by radar systems to determine ... the time. * The diode D does not conduct during the sweep, because it is reverse biased.

Description : Explain the term crossover distortion. State methods to overcome it.

Last Answer : Explanation:-  * Cross over distortion occurs in Class B push pull Amplifier.  * In the push-pull configuration, the two identical transistors get into conduction, one after the other and the output ... transistors won t be OFF at the same time. The remedy is to use Class AB amplifier.

Description : State classification of Amplifiers.

Last Answer : CLASSIFICATION OF AMPLIFIERS: A] Based on input signal 1. Small signal amplifiers 2. Large signal amplifiers B] Based on output signal 1. Voltage amplifier 2. Power amplifier C ... coupling 1. Direct coupled amplifiers 2. R-C Coupled amplifier 3. Transformer coupled amplifier

Description : The main electronic component used in first generation computers was A) Transistors B) Vacuum Tubes and Valves C) Integrated Circuits D) None of above

Last Answer : Answer : B

Description : Which of the following statements is true regarding the illustrated circuit? El-0069 A. This full wave bridge should never be used aboard ship because the ground on lead 'A' will show on ... be direct current suitable for electronic circuits requiring voltage regulation. D. All the above are true.

Last Answer : Answer: B

Description : In the illustration, the component labeled 'EXC' is _______. EL-0003 A. a separate class II regulated DC generator for critical direct current loads B. a generator feeding the FLD ... to drive the governor for turbogenerator speed. D. the electronic driver for the switchboard metering circuits

Last Answer : Answer: B

Description : In electronic circuits, DC voltages can be positive (+) or negative (-) when measured with respect to the _________. A. printed circuit board 'common' trace B. chassis, console frame or hull 'ground' C. analogue or digital circuitry 'common' bus D. all of the above

Last Answer : Answer: D

Description : Time delayed or delayed action-type fuses are designed to _____________. A. prevent grounds in branch circuits B. prevent opens in motor circuits C. permit momentary overloads without melting D. guard lighting and electronic circuits

Last Answer : Answer: C

Description : When troubleshooting most electronic circuits, 'loading effect' can be minimized by using a voltmeter with a/an ___________________. A. input impedance much greater than the impedance across which the voltage ... sensitivity of less than 1000 ohms/volt D. sensitivity of more than 1000 volts/ohm

Last Answer : Answer: A

Description : Claude Shannon described the operation of electronic switching circuits with a system of mathematical logic called _____________ a) LISP b) XLISP c) Neural networking d) Boolean algebra

Last Answer : c) Neural networking

Description : Which system is used in digital computers because all electrical and electronic circuits can be made to respond to the states concept: a. Hexadecimal number b. Binary number c. Octal number d. Decimal number

Last Answer : b. Binary number

Description : Karnaugh map is used for the purpose of (A) Reducing the electronic circuits used. (B) To map the given Boolean logic function. (C) To minimize the terms in a Boolean expression. (D) To maximize the terms of a given a Boolean expression.

Last Answer : (C) To minimize the terms in a Boolean expression.

Description : The element I am thinking about has several interesting characteristics. It occupies the same column in the periodic table as lead. Resistors which are commonly found in electronic circuits are often made out ... element is one of the hardest substances on earth. What element am I thinking about? 

Last Answer : ANSWER: CARBON

Description : In electronic circuits, what name is given to a frequency discriminating network designed to select or pass certain bands of frequencies with low attenuation and cause very high attenuation to other frequencies?

Last Answer : ANSWER: FILTER

Description : The diode oftenly used for voltage regulation in electronic circuits is (a) Zener (b) Varactor (c) Silicon (d) Germanium

Last Answer : The diode oftenly used for voltage regulation in electronic circuits is  Zener.

Description : Draw Bootstrap sweep generator circuit. Compare Miller Integrator and bootstrap sweep generator with respect to the technique used.

Last Answer : Circuit diagram of bootstrap sweep generator: Miller Integrator Bootstrap sweep generator It is an integrator used to convert input step waveform into ramp waveform. In ... than Bootstrap sweep circuit The linearity of sweep voltage is poor than Miller integrator

Description : Compare Class A ,Class B, Class C and class AB power amplifiers on the basis of: i)Angle of conduction ii)Efficiency iii)Position of operating pointing power dissipation iv)Distortion

Last Answer : Compare Class A ,Class B, Class C and class AB power amplifiers on the basis of: i)Angle of conduction ii)Efficiency iii)Position of operating pointing power dissipation iv)Distortion

Description : Define : (i) Sweep time (ii) Retrace time

Last Answer : (i) Sweep time: It is defined as time interval taken by time based signal generator to increase from minimum to maximum voltage. (ii) Retrace time: It is defined as time taken by time based signal generator to decrease from maximum to minimum voltage.

Description : Comment on the effect of negative feedback on the gain, input and output resistance of the feedback amplifiers.Describe the gain bandwidth product term used in this context and its importance.

Last Answer : Effect of negative feedback: 1. Gain decreases with negative feedback. 2. Input resistance increases with negative feedback. 3. Output resistance decreases with negative feedback. Explanation ... feedback bandwidth increases which means it is stable output on more range of frequency.