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51.	The value of dBm in power measurement is predictable by assuming the reference, which is equal to ________(a) 1mW(b) 10mW(c) 1/10 mW(d) 1/100 mWThe question was asked by my college director while I was bunking the class.This intriguing question comes from Frequency Compensation in section Frequency Response of Electronic Devices & Circuits
Answer» CORRECT option is (a) 1mW Best explanation: Basically, the Decibel (dB) is a logarithmic unit which is USED to state the gain of audio frequency amplifiers. This is so for the reason that the response of a human ear to the SOUND intensity exhibits logarithmic nature. Apart from this, dBm is a unit which is often used in power measurement.dBm refers to the dB value which is estimated by ASSUMPTION of a REFERENCE whose value is equal to 1mW.

52.	What is the total voltage gain of a high frequency response of differential amplifier if the gain of first stage is 4.8 and the gain of the second stage is 1.2?(a) 6.75(b) 6.55(c) 5.76(d) 5.65The question was posed to me in an online interview.I need to ask this question from High Frequency Response of the Differential Amplifiers topic in portion Frequency Response of Electronic Devices & Circuits
Answer» The correct answer is (C) 5.76 The EXPLANATION is: The total gain of a high frequency response of differential amplifier can be calculated by the formula given below. Where, AV = overall gain, AV1 = voltage gain of FIRST stage and AV2 = voltage gain of SECOND stage. Given AV1 = 4.8, AV2 = 1.2 AV = AV1 × AV2 = 4.8 × 1.2 = 5.76.

53.	What technique is used in Millers compensation?(a) Two – port network(b) Hybrid parameters(c) Grounding(d) Short circuitingI have been asked this question at a job interview.The doubt is from Miller Compensation and Pole Splitting in section Frequency Response of Electronic Devices & Circuits
Answer» Correct option is (a) Two – PORT network To explain: In Millers compensation, we use the equivalent two – port network of the GIVEN electrical circuit. We divide the circuit into two parts, each part representing a DIFFERENT port for EASIER analysis of the circuit.

54.	Fidelity is nothing but an ability of amplifier to reproduce ________(a) Input signal without any distortion(b) Output signal without any distortion(c) Phase shift signal(d) Amplitude shift signalThe question was posed to me in unit test.Query is from Frequency Compensation topic in portion Frequency Response of Electronic Devices & Circuits
Answer» Right answer is (a) Input signal without any distortion The explanation is: Fidelity is the property of amplifier which is USUALLY taken into consideration during the analysis of an amplifier’s frequency response. The ability or a potential of an amplifier in order to reproduce the distortion-less NATURE of input signal is known as ‘Fidelity’. Fidelity of an amplifier is dependent on the frequency response and the bandwidth of an amplifier to the greater extent. Fidelity gives an implication of satisfying the condition of distortion less output. This condition for distortion-less output IMPLIES that gain of an amplifier should be independent of frequency (CONSTANT) while the phase shift introduced by an amplifier should reveal proportionality with respect to frequency or ZERO.

55.	What is the total voltage gain of a high frequency response of multistage amplifier if the gain of first stage is 4 and the gain of the second stage is 10?(a) 0.4(b) 4(c) 40(d) 2.5This question was addressed to me during an interview.Question is from High Frequency Response of Multistage Amplifiers in chapter Frequency Response of Electronic Devices & Circuits
Answer» The correct answer is (C) 40 The explanation is: The total gain of a high frequency response of multistage amplifier can be calculated by the formula GIVEN below. Where, AV = overall gain, AV1 = voltage gain of first stage and AV2 = voltage gain of second stage. Given, AV1 = 4 & AV2 = 10 AV = AV1 × AV2 = 4 × 10 = 40.

56.	What is the voltage gain of a high frequency response of differential amplifier?(a) 1(b) 0(c) ∞(d) Cannot be determinedThe question was posed to me in an internship interview.My question is based upon High Frequency Response of the Differential Amplifiers topic in section Frequency Response of Electronic Devices & Circuits
Answer» Correct option is (a) 1 To explain: If all the RESISTOR values are of the equal value, then the circuit will have a voltage gain equal to exactly one or unity. HENCE it is also called as a Unity Gain High frequency response of differential AMPLIFIER. The output voltage expression would be the difference between the two voltages.

57.	What type of amplifier is a high frequency response of emitter follower amplifier?(a) Voltage amplifier(b) Wideband amplifier(c) Feedback amplifier(d) Power amplifierThis question was posed to me in an international level competition.My doubt is from High-Frequency Response of the Emitter Followers in division Frequency Response of Electronic Devices & Circuits
Answer» RIGHT answer is (c) Feedback amplifier Explanation: The high frequency response of emitter FOLLOWER amplifier is one of the most noticeable feedback amplifiers. It provides a negative current feedback to the circuit. These type of amplifiers are USUALLY USED in the end stage or the last stage of a series of amplifiers.

58.	Millers compensation and pole splitting is used in the high – frequency analysis of BJTs and FETs.(a) True(b) FalseThe question was asked by my college director while I was bunking the class.I need to ask this question from Miller Compensation and Pole Splitting in chapter Frequency Response of Electronic Devices & Circuits
Answer» Correct option is (a) True To EXPLAIN I would say: Miller compensation is a method used for steadying OPERATIONAL amplifiers through the USAGE of a capacitance NAMELY called Cf which is to be connected in a negative – feedback approach across ONE of the second stage internal gain.

59.	What is the advantage of using a high frequency response of multistage amplifier?(a) High gain and high bandwidth(b) High gain and low bandwidth(c) Low gain and high bandwidth(d) Low gain and low bandwidthThe question was asked in unit test.This interesting question is from High Frequency Response of Multistage Amplifiers in division Frequency Response of Electronic Devices & Circuits
Answer» The correct answer is (a) HIGH gain and high bandwidth The explanation: A circuit having a single transistor AMPLIFIER does not provide suitable bandwidth or gain. To overcome this difficulty, we combine SEVERAL amplification STAGES. The high frequency response of multistage AMPLIFIERS theory is used for high gain as well as high bandwidth.

60.	Generally, the resistance of thermistor decreases _______(a) Linearly with an increase in temperature(b) Linearly with the decrease in temperature(c) Exponentially with an increase in temperature(d) Exponentially with the decrease in temperatureI got this question in an interview for job.Query is from Frequency Compensation topic in portion Frequency Response of Electronic Devices & Circuits
Answer» Right option is (c) Exponentially with an increase in temperature To ELABORATE: Thermistor is a device or resistor WHOSE resistance is TOTALLY dependent on the temperature. Thermistor is widely applicable for several compensation techniques. It exhibits variation in its resistance with respect to change in temperature. As the resistance of thermistor decreases with an increase in temperature, this property of thermistor is also regarded as negative temperature coefficient of RESISTIVITY.

61.	How is the power gain of a high frequency response of emitter follower amplifier?(a) Irrelevant(b) Moderate(c) Low(d) HighThe question was posed to me during an internship interview.My doubt stems from High-Frequency Response of the Emitter Followers in section Frequency Response of Electronic Devices & Circuits
Answer» The CORRECT answer is (d) High For explanation I would say: One of the most significant difference between a normal amplifier and of a high frequency response of emitter follower amplifier CIRCUIT is its high power gain. The construction of a high frequency response of emitter follower amplifier circuit is APPROXIMATELY similar to a normal amplifier, HOWEVER the resistive load provides high power gain.

62.	How is the current gain of a high frequency response of emitter follower amplifier?(a) Irrelevant(b) Moderate(c) Low(d) HighThe question was posed to me in unit test.Enquiry is from High-Frequency Response of the Emitter Followers in chapter Frequency Response of Electronic Devices & Circuits
Answer» RIGHT answer is (d) HIGH Easiest explanation: The construction of a high frequency response of EMITTER follower amplifier circuit is almost SIMILAR to an ordered FEEDBACK amplifier. Nonetheless, one of the most striking differentiating feature of a current gain with resistive load circuit is its high current gain.