InterviewSolution

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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

101.	What is dBFS used to measure in terms of decibels?(a) Peak amplitude of a signal(b) Power relative to 1mW(c) Amplitude of a signal(d) Volume unitThe question was posed to me in class test.This interesting question is from The Decibel in division Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits
Answer» Right option is (c) AMPLITUDE of a signal The EXPLANATION is: We use dBFS to measure the amplitude of a signal in comparison to the maximum value a device could handle prior to CLIPPING. FS stands for full scale and is used to define the power level sinusoid or a full scale SQUARE WAVE.

102.	What does cascading of two transistor amplifiers imply?(a) Output of first stage sent to input of second stage(b) Output of first stage sent to coupling device(c) Input of first stage sent to input of second stage(d) Not relatedThe question was posed to me in a national level competition.This question is from Cascading Transistor Amplifiers in portion Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits
Answer» Right option is (b) OUTPUT of first stage sent to COUPLING device The explanation: In multi-stage amplifiers, the output of first stage is coupled to the input of second stage using a coupling device. The coupling devices is typically a capacitor or a transformer. Cascading is KNOWN as the process of combining TWO amplifier stages using a coupling device.

103.	What is the other name for an emitter follower amplifier configuration?(a) Common collector(b) Common base(c) Common emitter(d) Amplifier circuitI got this question in homework.Question is from The Emitter Follower topic in section Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits
Answer» Correct option is (a) Common collector The explanation is: The emitter follower circuit configuration is ALSO known as the common collector configuration as it provides a high input impedance and a low OUTPUT impedance. The emitter follower circuit acts as a BUFFER stage, and in result is USED in several circuits where there is a need to prevent the loading of a circuit.

104.	What is the value of overall current gain in the simplified CE hybrid model while considering RS?(a) AI × IB / IS(b) AI × IC / IS(c) AI × IS / IC(d) AI × IS / IBThe question was posed to me during an internship interview.Enquiry is from Simplified CE Hybrid Model in division Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits
Answer» CORRECT choice is (a) AI × IB / IS To EXPLAIN: The current gain in a simplified common EMITTER hybrid model while considering RS is calculated as the product of current gain without external parameters and the RATIO of base current and external applied current. It is EXPRESSED as AI × IB / IS. Where, IS is the external applied current on the amplifier.

105.	How is the voltage gain measured in an n-stage cascading amplifier?(a) Volts(b) Ampere(c) Decibels(d) DimensionlessI got this question in unit test.The origin of the question is N-Stage Cascading Amplifiers topic in portion Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits
Answer» Correct answer is (c) Decibels Best explanation: The voltage GAIN is measured in terms of decibels. The TOTAL voltage gain is calculated as the product of INDIVIDUAL stages or as a sum of all the stages if the gain calculated at each INTERMEDIATE STAGE was measured in decibels as well.

106.	How do we compute the output impedance of a simplified CB amplifier?(a) RC + RL(b) RB + RL(c) RC \|\| RL(d) RB \|\| RLThis question was posed to me in final exam.My doubt stems from Simplified Calculations for the CB Configuration topic in chapter Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits
Answer» The CORRECT choice is (c) RC \|\| RL For EXPLANATION I would SAY: The output impedance of a simplified common base (CB) amplifier can be expressed in terms circuit resistor VALUES. The base impedance is RC \|\| RL. Where RC is the equivalent collector resistance and RL is the equivalent load resistance.

107.	What is the corresponding change in level for a factor of 10 change in amplitude?(a) 100dB(b) 20dB(c) 10dB(d) 0.1dBI got this question in exam.My query is from The Decibel in division Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits
Answer» The CORRECT OPTION is (b) 20dB The explanation is: A decibel is TEN times the value of power in its logarithm in base 10. Therefore a 20dB change is RESULTANT of a change in amplitude by a factor of 10. However, when calculating in terms of power the change is due to a factor on 10.

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