Compare the fixed voltage regulators using 78XX and 79XX.

Compare the fixed voltage regulators using 78XX and 79XX.
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Compare the fixed voltage regulators using 78XX and 79XX.

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Describe the functional pin diagram of regulator IC 78XX and 79XX.

Description : Describe the functional pin diagram of regulator IC 78XX and 79XX.

Last Answer : IC 78XX: Explanation: 78XX series of IC regulators is representative of three terminal devices that are available with several fixed positive output voltages. It has three terminals labeled ... can also use 25μF aluminum electrolytic capacitor. Values given may be increased without limit. 

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

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

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 : 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

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.

Compare small signal amplifier with power amplifier

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

The kilowatt load can be adjusted on a paralleled generator by using the _____________. A. field rheostat B. governor control C. automatic voltage regulators D. hand tachometer

Description : The kilowatt load can be adjusted on a paralleled generator by using the _____________. A. field rheostat B. governor control C. automatic voltage regulators D. hand tachometer

Last Answer : Answer: B

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

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,

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

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.

The division of the reactive KVA load between paralleled AC generators is initiated by the ______________. A. prime mover governors B. voltage regulators C. phase balance relay D. proportioner

Description : The division of the reactive KVA load between paralleled AC generators is initiated by the ______________. A. prime mover governors B. voltage regulators C. phase balance relay D. proportioner

Last Answer : Answer: B

Equalization of the power factors of two alternators operating in parallel is accomplished _____________. A. manually, by adjusting the governor controls B. automatically, by automatic voltage regulators C. manually, adjusting the output of current transformers D. automatically, by the designed action of the governors

Description : Equalization of the power factors of two alternators operating in parallel is accomplished _____________. A. manually, by adjusting the governor controls B. automatically, by automatic voltage regulators ... the output of current transformers D. automatically, by the designed action of the governors

Last Answer : Answer: B

Automatic voltage regulators provided on switchboards function to _____________. A. regulate the AC load on the generator B. protect the switchboard from high voltage C. govern prime mover speed to control voltage D. vary the field excitation to the generators

Description : Automatic voltage regulators provided on switchboards function to _____________. A. regulate the AC load on the generator B. protect the switchboard from high voltage C. govern prime mover speed to control voltage D. vary the field excitation to the generators

Last Answer : Answer: D

Which is a function of the voltage regulators used with AC generators? A. To cut out generators when they are no longer required. B. To cut in additional generators automatically as required. C. To divide the KW load equally between generators operating in parallel. D. To divide reactive current between generators operating in parallel.

Description : Which is a function of the voltage regulators used with AC generators? A. To cut out generators when they are no longer required. B. To cut in additional generators automatically as ... between generators operating in parallel. D. To divide reactive current between generators operating in parallel.

Last Answer : Answer: D

The division of the kilowatt load between two AC generators operating in parallel is controlled by the settings and characteristics of the _____________. A. voltage regulators B. field rheostats C. reverse power relays D. prime mover governors

Description : The division of the kilowatt load between two AC generators operating in parallel is controlled by the settings and characteristics of the _____________. A. voltage regulators B. field rheostats C. reverse power relays D. prime mover governors

Last Answer : Answer: D

On AC vessels, which of the following statements represents the most difficult problem involved in obtaining a DC potential suitable for use by computer components? A. A stepdown transformer is always required. B. Vessel vibrations affect the voltage source. C. The voltage must be rectified and made ripple free. D. Rectifiers cannot operate with voltage regulators.

Description : On AC vessels, which of the following statements represents the most difficult problem involved in obtaining a DC potential suitable for use by computer components? A. A stepdown transformer is ... voltage must be rectified and made ripple free. D. Rectifiers cannot operate with voltage regulators.

Last Answer : Answer: C

What are the advantages of sequence control of ac voltage regulators?

Description : What are the advantages of sequence control of ac voltage regulators?

Last Answer : a. System power factor is improved. b. Harmonics are reduced in the source current and the load voltage.

What is meant by sequence control of ac voltage regulators?

Description : What is meant by sequence control of ac voltage regulators?

Last Answer : It means that the stages of voltage controllers in parallel triggered in a proper sequence one after the other so as to obtain a variable output with low harmonic content.

Give some examples of monolithic IC voltage regulators

Description : Give some examples of monolithic IC voltage regulators

Last Answer : 78XX series fixed output, positive voltage regulators 79XX series fixed output, negative voltage regulators 723 general purpose regulator.

What are the advantages of IC voltage regulators?

Description : What are the advantages of IC voltage regulators?

Last Answer : *low cost *high reliability *reduction in size *excellent performance

Give the classification of voltage regulators

Description : Give the classification of voltage regulators

Last Answer : *Series / Linear regulators  *Switching regulators.

Cold-cathode tubes can be used as voltage regulators because of what characteristic?

Description : Cold-cathode tubes can be used as voltage regulators because of what characteristic?

Last Answer : They have the ability to maintain a constant voltage drop across the tube despite changes in current flow.

The two basic types of voltage regulators are ___ and ___

Description : The two basic types of voltage regulators are ___ and ___

Last Answer : Series and shunt.

Motors, switches, voltage regulators, generators, etc., are a few examples of emi sources. What type of emi comes from these sources?

Description : Motors, switches, voltage regulators, generators, etc., are a few examples of emi sources. What type of emi comes from these sources?

Last Answer : Man-made.

The two basic types of voltage regulators are _______ and _______.

Description : The two basic types of voltage regulators are _______ and _______.

Last Answer : Series and shunt.

Electro-mechanical voltage regulators are generally used in (a) reactors (b) generators (c) transformers (d) all of the above

Description : Electro-mechanical voltage regulators are generally used in (a) reactors (b) generators (c) transformers (d) all of the above

Last Answer : (b) generators

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

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.

Explain stagger tuned amplifier with the help of waveforms.

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.

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

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 :

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

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.

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

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.

Explain principle of feedback amplifier.

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.

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

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.

State classification of Amplifiers.

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

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.

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.

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

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.

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

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.

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

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.

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

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. 

Classify the power amplifiers on the basis of operation and input/output waveforms.

Description : Classify the power amplifiers on the basis of operation and input/output waveforms.

Last Answer : Depending upon the operation and input/output waveforms power amplifiers are classified into following type. 1) Class A amplifier. 2) Class B amplifier. 3) Class C amplifier. 4) Class AB amplifier. 5) Class D amplifier

State the need of tuned amplifier in electronic circuits.

Description : State the need of tuned amplifier in electronic circuits.

Last Answer : Necessity of tuned amplifier: 1. Selection of the desired radio frequency signal. 2. Amplification of the selected signal to a selected voltage level.

State advantages of negative feedback used in feedback amplifier.

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

List the types of coupling used in BJT amplifier.

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

Which one of the following statements is not correct? A Since voltage depends on concentrations, using standard conditions makes it easier to compare different electrochemical reactions. B We have to measure the cell potential to obtain the difference in potential energy because the potential of half-reactions cannot be measured directly. C The direction of a redox reaction can only be determined experimentally. D Half-cell potentials for half-reactions are determined by combining the relevant half-cell with a standardised half-cell.

Description : Which one of the following statements is not correct? A Since voltage depends on concentrations, using standard conditions makes it easier to compare different electrochemical reactions. B We have ... half-reactions are determined by combining the relevant half-cell with a standardised half-cell.

Last Answer : C The direction of a redox reaction can only be determined experimentally. 

What are the biggest challenges regulators dealing with regarding to peer to peer money transfers?

Description : What are the biggest challenges regulators dealing with regarding to peer to peer money transfers?

Last Answer : Peer to Peer Money transfer uses a website or app to transfer funds from one person to another over Internet or Mobile Networks. The challenges are listed below: 1) Fraud and Chargebacks 2) Cross Border Transactions 3) Card Data Security 4) Multi Currency and payment Methods

What are the different types of regulators used in LPG Stove?

Description : What are the different types of regulators used in LPG Stove?

Last Answer : Low pressure regulator is standard type and regulate up to 28mbar, the high pressure regulator handles up to 500mbar and it is adjustable. The choice of regulator will depend on the type ... and application, home use cylinder will definitely require the low pressure regulator for safety reasons.

What is the difference between conformers and regulators?

Description : What is the difference between conformers and regulators?

Last Answer : simply, Regulator uses internal control mechanism to have the best temperature it needs for its body. on the other hand, conformer find a place with a good temperature to live in, because they can't regulate.

What is the difference between conformers and regulators?

Description : What is the difference between conformers and regulators?

Last Answer : simply, Regulator uses internal control mechanism to have the best temperature it needs for its body. on the other hand, conformer find a place with a good temperature to live in, because they can't regulate.

Lactose or its analogues act as positive regulators of lac operon by (A) Attaching to i gene and preventing its expression (B) Increasing the synthesis of catabolite gene activator protein (C) Attaching to promoter region and facilitating the binding of RNA polymerase holoenzyme (D) Binding to repressor subunits so that the repressor cannot attach to the operator locus

Description : Lactose or its analogues act as positive regulators of lac operon by (A) Attaching to i gene and preventing its expression (B) Increasing the synthesis of catabolite gene activator protein (C) ... holoenzyme (D) Binding to repressor subunits so that the repressor cannot attach to the operator locus

Last Answer : Answer : D

Which of the following apex body and regulators has asked banks to swap customer related information so that the frauds and defaults may be prevented in future? (A) Bombay Stock Exchange (BSE) (B) Indian Banks Association (IBA) (C) Securities Exchange Board of India (SEBI) (D) Reserve Bank of India (RBI)

Description : Which of the following apex body and regulators has asked banks to swap customer related information so that the frauds and defaults may be prevented in future? (A) Bombay Stock Exchange (BSE) (B) Indian Banks ... (IBA) (C) Securities Exchange Board of India (SEBI) (D) Reserve Bank of India (RBI)

Last Answer : Answer: Reserve Bank of India (RBI)

Mention the functions of plant growth regulators.

Description : Mention the functions of plant growth regulators.

Last Answer : Plant growth regulators promote cell division, cell enlargement/elongation and cell differentiation. They induce photropic movement of shoot system.

Mention the types of growth regulators and give example.

Description : Mention the types of growth regulators and give example.

Last Answer : a) Plant growth promoters ex: Auxins, Gibberellins, cytokinins b) Plant growth inhibitors ex: Abscisic acid, Ethylene