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 : 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
Last 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 : What is the efficiency of Class-B amplifier? A) 68.50% B) 78.50% C) 88.50% D) 98.50%
Last Answer : What is the efficiency of Class-B amplifier? A) 68.50% B) 78.50% C) 88.50% D) 98.50%
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
Last Answer : The effect of a finite gain of an operational amplifier used in an integrator is that there will be instability in the circuit
Last Answer : Active region of BJT act as amplifier.
Description : A differential amplifier has a differential gain of 20,000, CMRR : 80 dB. The common mode gain is given by
Last Answer : A differential amplifier has a differential gain of 20,000, CMRR : 80 dB. The common mode gain is given by 2
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
Last Answer : B
Description : working of class B push pull amplifier.
Last 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.
Last 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.
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 : applications of RC coupled amplifier
Last 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.
Last 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.
Last 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.
Last 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
Last Answer : transformer coupled amplifier
Description : Single stage CE amplifier
Last 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.
Last 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.
Last 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.
Last 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.
Last 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.
Last 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.
Last 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.
Last 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.
Last 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 : 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
Last 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 : The voltage gains of the amplifier with and without feedback are 20 and 100 respectively. The percentage of negative feedback would be
Last 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
Last 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
Last 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 gain of an ideal amplifier must be
Last Answer : The gain of an ideal amplifier must be infinity
Last Answer : The voltage regulation in magnetic amplifier type voltage regulator is effected by varying the reactance.
Description : What is a BJT amplifier?
Last Answer : Bilpolar Juntion transistor , this fuction is control the current
Last Answer : ADC-Amplifier interface: In most data acquisition system analog to digital converter (ADC) is interfaced with the amplifier. There are different interface architectural schemes. Operational ... . The interaction between analog to digital converter and amplifier affects the system performance.
Description : The diagram shown in the illustartion represents a/an _____________. EL-0022 A. magnectic amplifier B. common base amplifier C. common collector amplifier D. common emitter amplifier
Last Answer : Answer: D
Description : In the illustrated circuit, the amplifier is connected in what basic configuration? EL-0022 A. common base B. reverse bias, negative feedback C. common emitter D. common collector
Last Answer : Answer: C
Description : In the illustrated circuit, the amplifier is connected in what basic configuration? EL-0045 A. common emitter B. common collector C. darlington paired, capacitor coupled D. common base
Description : In the common–emitter transistor circuit, if the current gain is 100 and the collector current is 10 mA, the base current is: (1) 10 µA (2) 100 µA (3) 1 A (4) 10 A
Last Answer : In the common–emitter transistor circuit, if the current gain is 100 and the collector current is 10 mA, the base current is: 100 µA
Description : Common collector arrangement is generally used - - -
Last Answer : Common collector arrangement is generally used Impedance matching
Description : In an amplifier the collector voltage equals the full V+ of 28 V instead of the normal 12 V which of the following can be the trouble? A) RL is open B) Cc is open C) RE is open D) CE is shorted.
Last Answer : B) Cc is open
Description : If the operating point of an NPN transistor amplifier is selected in saturation region, it is likely to result in A) Thermal runaway of transistor B) Clipping of output in the positive half of the ... for high dc collector supply D) Clipping of output in the negative half of the input signal
Last Answer : B) Clipping of output in the positive half of the input signal
Description : In class - A power amplifier, the collector dissipation is maximum when (a) no signal is present (b) signal swing is maximum (c) signal swing is (1/1.414) of its maximum (d) none of the above
Last Answer : In class - A power amplifier, the collector dissipation is maximum when no signal is present
Description : A transistor has a typical value of β = 200 , If the collector current is 15 mA, then base current will be
Last Answer : A transistor has a typical value of β = 200 , If the collector current is 15 mA, then base current will be 0.075 mA
Description : If a transistor were operated with emitter and collector interchanged, then 1 .emitter current will increase 2. Collector current will increase 3. Base current will decrease 4. No current flow will take place
Last Answer : If a transistor were operated with emitter and collector interchanged, then Collector current will increase
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
Description : A buffer amplifier is usually associated with (A) High input resistance (B) Low output resistance (C) Unity Voltage Gain (D) All Of the above
Last Answer : A buffer amplifier is usually associated with (A) High input resistance (B) Low output resistance (C) Unity Voltage Gain (D) All Of the above
Description : In a klystron amplifier the input cavity is called: (1) Buncher (2) Catcher (3) Pierce gun (4) Collector
Last Answer : In a klystron amplifier the input cavity is called: Buncher.
Description : Negative feedback in amplifier: (1) Improves the SNR at input (2) Improve SNR at output (3) Reduces distortion (4) Decreases bandwidth
Last Answer : Negative feedback in amplifier: Reduces distortion.
Description : Which amplifier will be preferred for highest gain? (1) Darlington pair (2) Cascade amplifier (3) Cascode amplifier (4) Depends on the circuitry
Last Answer : Cascode amplifier will be preferred for highest gain.
Description : For biomedical applications the mostly used amplifier is A) Single ended amplifier B) Differential amplifier C) Inverting operational amplifier D) Chopper amplifier
Last Answer : Inverting opamp
Last Answer : The output stage of a practical amplifier is always Transformer coupled
Last Answer : No. of 20 watts loudspeakers permitted to connect an 250 watt amplifier are 12.
Last Answer : In a CB amplifier the maximum efficiency could be 25%.