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What is the advantage of differential amplifier?

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Description : What is the use of differential amplifier?

Description : A differential amplifier has a differential gain of 28000 and CMRR is 60 dB. What will be the value of common mode gain? A) Ac = 0.125 B) Ac = 0.33 C) Ac = 3 D) Ac = 28 

Answer : A differential amplifier has a differential gain of 28000 and CMRR is 60 dB. What will be the value of common mode gain? A) Ac = 0.125 B) Ac = 0.33 C) Ac = 3 D) Ac = 28 

Description : A differential amplifier has a differential gain of 20,000, CMRR : 80 dB. The common mode gain is given by

Answer : A differential amplifier has a differential gain of 20,000, CMRR : 80 dB. The common mode gain is given by 2

Description : What type of biasing is used in CE amplifier?

Description : What do you mean by frequency response of an amplifier?

Description : What is the power amplifier?

Description : What is the meaning of operational amplifier?

Description : The purpose of the restraining coil in a biased differential relay is  (A) To reduce CT saturation during fault.  (B) To increase the sensitivity of the relay.  (C) To match the transformation ratio.  (D) To limit the spill current through the relay during heavy external fault.

Answer : d

Answer : A differential relay measures the vector difference between two or more similar electrical quantities.

Description : How does an operational amplifier work?

Description : What is the advantage of a log house?

Answer : What is the advantage of a log house? Our contemporaries most often use timber for the construction of country cottages, intended for relaxation from the bustle of the city. Such houses are ... retardants. This is a much better and more durable method when compared to impregnation from sprayers.

Description : What is the advantage of AC over DC electrical transmission?

Description : What is the advantage of using soft starters?

Description : What is the advantage of high power factor?

Answer : Reduced copper losses Smaller conductor size Improve voltage regulation Increase system capability Less energy bill

Description : Write one advantage and one disadvantage each for spring control method and gravity control method.

Answer : Advantages of Spring Control Method: 1) The spring-controlled meters may be used in any position. 2) In some instruments, springs can be used as current leads. 3) As springs are light in weight ... only. 2) Scale is non-uniform. 3) Control weights add to the weight of instrument.

Description : List one advantage and one disadvantage of one wattmeter method. 

Answer : Advantages:  1) Only one wattmeter is used.  2) Less number of connections.  3) Cost required is less.  Disadvantages:  1) Used only for 3- Φ balanced load and not for ... be accessible for connecting the Pressure coil.  3) Delta connection must be opened to connect current coil. 

Description : The main advantage of AC over DC is:  (A) Conversion flexibility from one voltage level to other (B) AC can be easily converted into DC by using a rectifier (C) AC is easy to maintain & can be easily distributed at long distances (D) All of the above

Answer : Ac is easy to maintain and ac can be easily converted to dc by rectifier .There is no commutator for conversion in ac that's why ac machines are weight less and more efficiency.ac machines occupy less space than dc .

Description : What is distortion in class B amplifier

Description : The unity gain bandwidth of an inverting amplifier is 10 MHz What would be the bandwidth if the gain is increased to 10 V/V? A) 100 MHz B) 1 MHz C) 10 MHz D) 1 kHz 

Answer : The unity gain bandwidth of an inverting amplifier is 10 MHz What would be the bandwidth if the gain is increased to 10 V/V? A) 100 MHz B) 1 MHz C) 10 MHz D) 1 kHz 

Description : What is the efficiency of Class-B amplifier?  A) 68.50% B) 78.50% C) 88.50% D) 98.50%

Answer : What is the efficiency of Class-B amplifier?  A) 68.50% B) 78.50% C) 88.50% D) 98.50%

Description : What is a BJT amplifier?

Description : What is stability in an amplifier?

Description : A feedback amplifier has a gain of 1000 without feedback. Find the gain with feedback and the amount of feedback in dB for a negative feedback of 10%. 

Description : working of class B push pull amplifier.

Answer : Circuit Diagram:- Operation:  In class B amplifier transistor conduct only for half cycle of input signal.One conduct in positive half cycle and other conducts in negative half ... Then output transformer joins these two halves and produces a full sine wave in the load resistor. 

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.

Description : role of tuned LC circuit in tuned amplifier.

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 :  applications of RC coupled amplifier

Answer : Applications of RC coupled amplifier: (i) Widely used as Voltage amplifiers. (ii) They are used in Public Address System. (iii) In Tape recorders. (iv) In stereo amplifiers (v) In T.V. V.C.R. and C.D. Players.

Description : characteristics of Hi-Fi amplifier system.

Answer : Characteristics of HI-FI amplifier: 1. Signal to noise ratio should be better than 50dB. 2. Frequency response should be flat within +-1dB. 3. Nonlinear distortion should not be more ... provided. 6. Environmental conditions should be such as to eliminate the external noise in listening room. 

Description :  two stage amplifier and need of multistage amplifier.

Answer : Circuit diagram of two stage amplifier : Need of multistage amplifier: The output from a single stage amplifier is usually insufficient to drive an output device. So that ... to second amplifier.  To increase the overall gain of the amplifier multistage amplifier is needed.

Description : advantages and disadvantages of direct coupled amplifier over RC coupled amplifier. 

Answer : Advantages:  Due to absence of coupling capacitors, the gain does not reduce on the lower frequency side.  This amplifier can amplify dc signals. Reduced cost and complexity due to absence of ...   The output waveform has a dc shift.  Poor frequency response at a higher frequency.

Description :  transformer coupled amplifier

Answer :  transformer coupled amplifier

Description : Single stage CE amplifier

Answer : Requirement(Necessity) of Multistage amplifier: -In many applications we required a high gain. But sometimes gain produced by an amplifier is not sufficient so to increase the gain, we ... necessity of multistage amplifier is for providing high gain. It is also required for high bandwidth.

Description : Give the different types of amplifier coupling.

Answer : 1. Resistance – capacitance (RC) coupling.  2. Inductance (LC) coupling.  3. Transformer coupling (TC)  4. Direct coupling (D.C.)

Description : State the need of multistage amplifier. Draw frequency response of R-C coupled amplifier.

Answer : The need of multistage amplifier The voltage (or power) gain, obtained from a single stage small signal amplifier, is limited. Therefore, it is not sufficient for all practical applications. Therefore, in ... to use a MULTISTAGE AMPLIFIER .  Frequency response of R-C coupled amplifier.

Description : Define gain and bandwidth of an amplifier.

Answer : Bandwidth  The range of frequency over which the voltage gain is equal to or greater than 70.7% of its maximum value Gain: The ratio of output parameter (voltage/ current /power) to the input parameter (voltage/ current /power) of an amplifier is known as gain. It is denoted by a letter A

Description : Draw diagram of class A push-pull amplifier and explain its operation. 

Answer : Class A Push-pull Amplifier: The circuit diagram of class A push-pull amplifier is as shown in the fig.(a). Operation: The resistors R1 and R2 along with Vcc provide the dc biasing so as ... Vcc is applied to the collectors of transistors Q1 and Q2 through the centretapped output transformer. 

Description : State the need of cascade amplifier and draw circuit diagram of 2-stage direct coupled amplifier.

Answer : Need:- The voltage (or power) gain, obtained from a single stage small signal amplifier, is limited. Therefore, it is not sufficient for all practical applications. Therefore, in order to obtain greater voltage and power gain, cascade amplifiers are used.

Description : Compare RC coupled, transformer coupled and direct coupled amplifier based on four points.

Answer : Parameter RC coupled Transformer coupled Direct coupled  Coupling element Resistor and capacitor Transformer No element Impedance matching Poor Excellent good Frequency ... Low frequency amplifier,opamp Size and cost small Large and bulky least

Description : List the advantages of RC coupled amplifier.

Answer : Advantages: 1. The frequency response is excellent 2. The circuit is very compact and extremely light 3. Cost is low because it employ resistors and capacitors which are cheap 

Description : State the need of cascade amplifier.

Answer : Most systems a single transistor amplifier does not provide sufficient gain or bandwidth or will not have the correct input or output impedance matching. Hence cascade amplifier is use which consist more than one stages of amplification.

Description : Which one of the following is another name for common-collector amplifier?  A) Source follower B) Collector follower C) Base follower D) Emitter follower

Answer : Which one of the following is another name for common-collector amplifier?  A) Source follower B) Collector follower C) Base follower D) Emitter follower

Description : The voltage gains of the amplifier with and without feedback are 20 and 100 respectively. The percentage of negative feedback would be

Answer : The voltage gains of the amplifier with and without feedback are 20 and 100 respectively. The percentage of negative feedback would be 4%

Description : An amplifier has input power of 2 microwatts. The power gain of the amplifier is 60 dB. The output power will be

Answer : An amplifier has input power of 2 microwatts. The power gain of the amplifier is 60 dB. The output power will be 2 watts

Description : An amplifier has a voltage gain of 120. To reduce distortion, 10% negative feedback is employed. The gain of the amplifier with feedback is  (1) 141 (2) 92.3 (3) 9.23 (4) 1.41

Answer : An amplifier has a voltage gain of 120. To reduce distortion, 10% negative feedback is employed. The gain of the amplifier with feedback is 9.23

Description : The voltage gain of a common -source JFET amplifier depends up on its  (1) Input impedance (2) Amplification factor (3) Dynamic drain resistance (4) Drain load resistance

Answer : 2

Description : The gain of an ideal amplifier must be

Answer : The gain of an ideal amplifier must be infinity

Description : The effect of a finite gain of an operational amplifier used in an integrator is that (A) it would not integrate (B) the slope of the output will vary with time (C) the final value of the output voltage will reduce (D) there will be instability in the circuit

Answer : The effect of a finite gain of an operational amplifier used in an integrator is that there will be instability in the circuit

Answer : The voltage regulation in magnetic amplifier type voltage regulator is effected by varying the reactance.

Description : How can BJT be used as an amplifier?

Description : How does negative feedback reduces distortion in an amplifier?

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