39 + Interview Questions in Interfacing To The Analog World in Embedded Systems Page 1 InterviewSolution

1.	Which of the following can be used for providing high gain?(a) transistor(b) darlington transistor pair(c) resistor(d) capacitorThe question was asked in an online quiz.My doubt is from Power Controls topic in division Interfacing to the Analog World of Embedded Systems
Answer» RIGHT choice is (b) darlington transistor pair To elaborate: The darlington pair of transistors can provide high gain than a single transistor. This is one of the method used to avoid voltage mismatches that the system produces. By USING high gain transistors the voltage mismatches can be reduced UPTO a LIMIT.

Discussion

2.	Which of the following can provide a speed control technique in the DC motor interfacing?(a) PCM(b) DPCM(c) ADPCM(d) PWMI got this question in an online interview.Question is from Power Controls in division Interfacing to the Analog World of Embedded Systems
Answer» Right choice is (d) PWM The explanation is: The pulse WIDTH MODULATION can PROVIDE a speed control technique in the DC motor interfacing by CHANGING its mark/space ratio.

Discussion

3.	Which of the following is a current limiting device?(a) voltage(b) current(c) buffer(d) inductorThis question was addressed to me during an interview for a job.My question is taken from Power Controls in section Interfacing to the Analog World of Embedded Systems
Answer» Correct answer is (C) buffer Easiest explanation: A buffer can be used as a current limiting DEVICE. Similarly, a TRANSISTOR can ALSO be used as a current limiting device.

Discussion

4.	How many types of logarithmic codecs are used commonly?(a) 2(b) 3(c) 4(d) 5This question was addressed to me by my school principal while I was bunking the class.Enquiry is from Codecs in chapter Interfacing to the Analog World of Embedded Systems
Answer» Right answer is (a) 2 To EXPLAIN: There are two types of logarithmic codec which are COMMONLY USED. They are a-law which is used in UK and µ-law codec which is used in the US.

Discussion

5.	Which of the following conversion is performed by using a lookup table?(a) DPCM(b) ADPCM(c) Between DPCM and ADPCM(d) Linear cdec and a-lawI have been asked this question in final exam.This interesting question is from Codecs in portion Interfacing to the Analog World of Embedded Systems
Answer» RIGHT ANSWER is (d) LINEAR cdec and a-law Easiest explanation: The conversion between a-law/µ-law and a linear DIGITAL signal or between µ-law and a-law is PERFORMED by a lookup table.

Discussion

6.	What does PCM stand for?(a) pulse codec machine(b) pulse code modulation(c) peripheral code machine(d) peculiar code modulationThe question was posed to me in an interview for internship.My enquiry is from Codecs in portion Interfacing to the Analog World of Embedded Systems
Answer» The correct answer is (b) PULSE code MODULATION The explanation: The LINEAR CODEC is also known as pulse code modulation which is commonly used in the TELECOMMUNICATIONS industry.

Discussion

7.	Which of the following introduce a phase error?(a) conversion time(b) sampling rate(c) sample size(d) sample natureI had been asked this question by my college director while I was bunking the class.Question is taken from Errors of ADC Technique topic in section Interfacing to the Analog World of Embedded Systems
Answer» Right CHOICE is (a) conversion time The BEST I can explain: The conversion time ALWAYS introduces a phase error. The conversion time will DELAY the digital output and hence introduce a phase error.

Discussion

8.	Which codec is used in the UK?(a) a-law(b) µ-law(c) linear codec(d) PCMI got this question in exam.My doubt is from Codecs in section Interfacing to the Analog World of Embedded Systems
Answer» Right option is (a) a-law Easy EXPLANATION: The a-law is a LOGARITHMIC codec which is COMMONLY USED in the UK whereas µ-law is used in the US.

Discussion

9.	Which is the first type of error caused during the conversion process?(a) sampling error(b) interrupt signal(c) counter error(d) quantisation errorThe question was posed to me in unit test.My doubt is from Errors of ADC Technique in section Interfacing to the Analog World of Embedded Systems
Answer» Right choice is (d) quantisation error For explanation I would say: The quantisation error is the first TYPE of error caused in the conversion process. This error is caused because the SAMPLES are converted to a slightly higher VALUE INSTEAD of zero.

Discussion

10.	Which of the following generates a back EMF?(a) relay(b) buffer(c) transistor(d) FETI got this question in an online interview.My doubt is from Power Controls topic in portion Interfacing to the Analog World of Embedded Systems
Answer» RIGHT answer is (a) relay For EXPLANATION I would say: The relay generates a BACK voltage across its terminals when the logic output SWITCHES from a HIGH to low state.

Discussion

11.	Which of the following determines the brightness of LEDs?(a) current(b) voltage(c) resistance(d) conductanceI got this question in an online quiz.I'm obligated to ask this question of Power Controls in section Interfacing to the Analog World of Embedded Systems
Answer» The correct ANSWER is (a) current For explanation: The current drive determines the BRIGHTNESS of the LEDs and it is usually associated with a current LIMITING RESISTOR in series with the LED to prevent the overheating.

Discussion

12.	Which of the following have a 16-bit digital dynamic range?(a) PCM(b) DPCM(c) linear codec(d) logarithmic codecI got this question by my school teacher while I was bunking the class.Asked question is from Codecs in section Interfacing to the Analog World of Embedded Systems
Answer» Correct choice is (b) DPCM Explanation: The differential pulse CODE modulation can improve the accuracy and RESOLUTION by having a 16-bit dynamic range. It works by the INCREASING dynamic range.

Discussion

13.	Which signal is sampled at regular intervals for the purpose of ADC?(a) analog signal(b) digital signal(c) quantised signal(d) sampled signalI have been asked this question during an online interview.This interesting question is from Errors of ADC Technique topic in chapter Interfacing to the Analog World of Embedded Systems
Answer» The correct OPTION is (a) ANALOG signal To explain: The analog signal is SAMPLED at regular intervals for the analog to digital conversion. Each sample is then quantised to divided by a given value in order to identify the number of approximate ANALOGUE value.

Discussion

14.	Which of the following defines the number of samples that are taken in the time period?(a) sample size(b) sample nature(c) sample rate(d) sample frequencyThe question was posed to me during an interview.My doubt stems from Errors of ADC Technique topic in chapter Interfacing to the Analog World of Embedded Systems
Answer» Correct OPTION is (c) sample rate To elaborate: The sample rate is DEFINED by the NUMBER of samples that are taken in a time period. The sample rate is usually MEASURED in Hertz. It can determine the speed of the conversion device itself.

Discussion

15.	Which codec is used in digital audio?(a) A-law(b) µ-law(c) linear(d) PCMI had been asked this question during a job interview.The question is from Codecs in portion Interfacing to the Analog World of Embedded Systems
Answer» Correct ANSWER is (c) linear Explanation: In the linear CODEC, the relationship between the analogue and DIGITAL values are linear. This METHOD is COMMONLY used in digital audio communication.

Discussion

16.	How is the biasing done in LEDs?(a) forward bias(b) no bias(c) supply voltage(d) reverse biasThe question was posed to me during an internship interview.My doubt is from Power Controls topic in portion Interfacing to the Analog World of Embedded Systems
Answer» Right OPTION is (d) reverse bias Explanation: The LEDs will LIGHT up only when the diode reverse breakdown is ACHIEVED. It is usually about 2 to 2.2V.

Discussion

17.	What does DPCM stand for?(a) differential pulse code modulation(b) data pulse code modulation(c) dynamic pulse code machine(d) dynamic pulse code modulationThis question was addressed to me in semester exam.I would like to ask this question from Codecs topic in division Interfacing to the Analog World of Embedded Systems
Answer» Right answer is (a) differential pulse CODE MODULATION Easiest explanation: The differential pulse code modulation is similar to pulse code modulation, but DPCM uses an encoded value which is the DIFFERENCE between the CURRENT and the previous sample.

Discussion

18.	Which of the following allows voltage reversing?(a) H bridge(b) Relays(c) LEDs(d) LCDsThis question was addressed to me during an interview.I'd like to ask this question from Power Controls in division Interfacing to the Analog World of Embedded Systems
Answer» The correct OPTION is (a) H bridge To ELABORATE: The H bridge is used in CONTROLLING DC MOTORS or any other LOADS which need voltage reversing.

Discussion

19.	Which filter is used for filtering out the high frequency components?(a) bandpass filter(b) band reject filter(c) analogue filter(d) digital filterThis question was posed to me in quiz.This is a very interesting question from Errors of ADC Technique in section Interfacing to the Analog World of Embedded Systems
Answer» Right option is (c) analogue filter Easy explanation: The higher FREQUENCY COMPONENTS can be FILTERED out by USING an ANALOG filter after sampling.

Discussion

20.	Which of the following can determine the maximum frequency that can be converted?(a) sample frequency(b) sample rate(c) sample size(d) sample natureThe question was posed to me in quiz.The doubt is from Errors of ADC Technique in portion Interfacing to the Analog World of Embedded Systems
Answer» The correct CHOICE is (b) sample rate Easiest explanation: The sample rate can DETERMINE the maximum frequency that can be CONVERTED as PER the Nyquist theorem. The theorem STATES that the minimum sampling rate frequency should be twice the maximum frequency of the analog signal.

Discussion

21.	Which of the following can determine the speed of conversion device itself?(a) sample rate(b) sampled data(c) sample size(d) sample natureI had been asked this question in examination.This is a very interesting question from Errors of ADC Technique in chapter Interfacing to the Analog World of Embedded Systems
Answer» Correct answer is (a) SAMPLE rate To elaborate: The sample rate determines the various aspect of the CONVERSION PROCESS and one such is the conversion speed.

Discussion

22.	From which of the following words does codecs is derived?(a) coder(b) decoder(c) coder-decoder(d) coder-encoderThe question was asked during an internship interview.My doubt is from Codecs in chapter Interfacing to the Analog World of Embedded Systems
Answer» Right OPTION is (c) coder-decoder The best explanation: The CODEC is derived coder-decoder and is COUPLED to perform the CODING. It can support both analogue to digital conversion and digital to analogue conversion.

Discussion

23.	Which of the following can generate an interrupt?(a) timer(b) trigger(c) delay(d) counterThe question was posed to me during an internship interview.My question comes from Errors of ADC Technique topic in section Interfacing to the Analog World of Embedded Systems
Answer» Correct ANSWER is (a) timer To elaborate: The timer can generate an interrupt to the PROCESSOR at the RATE of sampling FREQUENCY.

Discussion

24.	Which of the following is used to create H bridge?(a) switches(b) led(c) capacitor(d) inductorI got this question in quiz.The question is from Power Controls in portion Interfacing to the Analog World of Embedded Systems
Answer» The correct answer is (a) SWITCHES To explain I would SAY: The H bridge can be created by using several switches. This allows a DC motor to be switched on and reversed in the direction and the switching of DC motor can be done by using two outputs and FOUR FETs.

Discussion

25.	Which factor depends on the quantisation error?(a) number of error(b) number of bits(c) size of error(d) conversion processI have been asked this question in examination.This intriguing question comes from Errors of ADC Technique in portion Interfacing to the Analog World of Embedded Systems
Answer» The correct choice is (b) number of bits Easy explanation: The QUANTISATION ERROR depends on the number of bits which is USED to represent the analogue vale.

Discussion

26.	Which of the following is used to avoid the back EMF in the relay?(a) resistor(b) capacitor(c) inductor(d) diodeI had been asked this question in an interview.This intriguing question comes from Power Controls topic in chapter Interfacing to the Analog World of Embedded Systems
Answer» CORRECT choice is (d) diode To explain: In ORDER to get rid of the back EMF which is generated by the relay a diode is connected ACROSS the terminals which OPERATE in the reverse bias so that nothing can HARM the relay.

Discussion

27.	Which of the following can switch the current by a make or break contact?(a) transistor(b) relay(c) buffer(d) fetThis question was posed to me in unit test.My question comes from Power Controls topic in portion Interfacing to the Analog World of Embedded Systems
Answer» The correct ANSWER is (b) RELAY To explain: The relays are a kind of switching POWER in which the LOGIC signal is used to energise the relay. The relay contacts are break or MAKE accordingly and helps in switching the current.

Discussion

28.	Which of the following works by increasing the dynamic range?(a) logarithmic codec(b) linear codec(c) DPCM(d) PCMI got this question during an online exam.This is a very interesting question from Codecs topic in portion Interfacing to the Analog World of Embedded Systems
Answer» RIGHT OPTION is (c) DPCM For explanation I would say: The differential PULSE code modulation can improve the accuracy and resolution by having a 16-bit dynamic RANGE. It WORKS by the increasing dynamic range.

Discussion

29.	Which devices are used as indicators in a digital system?(a) LCD(b) LED(c) Varactor diode(d) Gunn diodeThis question was posed to me by my school principal while I was bunking the class.My question is taken from Power Controls in chapter Interfacing to the Analog World of Embedded Systems
Answer» The correct option is (b) LED Easy EXPLANATION: The light emitting diodes are USED as INDICATORS in the DIGITAL system and can be directly driven from a logic output.

Discussion

30.	Which device can make the PWM operation easier?(a) timer(b) software(c) hardware(d) transistorI have been asked this question in a job interview.This intriguing question originated from Codecs in chapter Interfacing to the Analog World of Embedded Systems
Answer»

Discussion

31.	Which is used in the telecommunication applications which has a limited bandwidth of 300 to 3100 HZ?(a) linear codec(b) logarithmic codec(c) PCM(d) DPCMThe question was posed to me in unit test.This question is from Codecs in portion Interfacing to the Analog World of Embedded Systems
Answer» The CORRECT choice is (b) logarithmic CODEC For explanation I would SAY: The logarithmic codec is frequently used in the TELECOMMUNICATION system which have a limited bandwidth of 300 to 3100 HZ. this can provide an 8-bit sample at 8 KHz, which are used in the telephones. The commonly used are A-law and µ-law.

Discussion

32.	Which term determines the random timing error?(a) jitter(b) quantisation error(c) sample error(d) delayThe question was posed to me in exam.The query is from Errors of ADC Technique in division Interfacing to the Analog World of Embedded Systems
Answer» Correct OPTION is (a) jitter The explanation is: Jitter is a random TIMING ERROR. Jitter can cause IRREGULAR SAMPLING errors.

Discussion

33.	Which allows the switching of DC motor by using two outputs and four FETs?(a) transistor(b) H bridge(c) darlington pair(d) buffer packThis question was addressed to me in an international level competition.My question is from Power Controls in division Interfacing to the Analog World of Embedded Systems
Answer» Correct choice is (B) H bridge For explanation I WOULD say: The H bridge can be created by USING several switches which allows a DC motor to be switched on and reversed in the direction. The SWITCHING can be done by using TWO outputs and four FETs.

Discussion

34.	Which of the following uses a non-linear quantisation value?(a) PCM(b) DPCM(c) ADPCM(d) linear codecThe question was asked in an interview for job.My question is taken from Codecs topic in section Interfacing to the Analog World of Embedded Systems
Answer»

Discussion

35.	Which theorem describes the sampling rate with the frequency of the analogue signal?(a) Nyquist theorem(b) Bayes theorem(c) Sampling theorem(d) Parseval’s theoremI got this question during an online exam.My doubt stems from Errors of ADC Technique topic in chapter Interfacing to the Analog World of Embedded Systems
Answer» Correct CHOICE is (a) Nyquist THEOREM To explain I would say: The Nyquist theorem states that the minimum sampling RATE frequency should be twice the MAXIMUM frequency of the ANALOG signal.

Discussion

36.	Which of the following have the same quantisation step throughout the range?(a) linear(b) PCM(c) DPCM(d) ADPCMI have been asked this question in an interview for job.Origin of the question is Codecs in portion Interfacing to the Analog World of Embedded Systems
Answer» Correct choice is (a) linear The best I can EXPLAIN: The QUANTISATION step is same throughout the dynamic range in the linear codec and THUS any INCREASE in the analogue value increases the digital value, that is, the overall performance is linear.

Discussion

37.	Which devices have high drive capability?(a) transistor(b) fet(c) buffer pack(d) darlington amplifierThis question was addressed to me in examination.My enquiry is from Power Controls topic in portion Interfacing to the Analog World of Embedded Systems
Answer» Correct answer is (c) BUFFER PACK Best explanation: The buffer pack is used to avoid the voltage mismatches which POSSESSES a high drive capacity and it can also provide high drive CURRENTS than the normal LOGIC outputs.

Discussion

38.	Which of the following is used to switch heavy loads?(a) fet(b) transistor(c) buffer pack(d) darlington pairThe question was posed to me in an international level competition.The question is from Power Controls topic in chapter Interfacing to the Analog World of Embedded Systems
Answer»

Discussion

39.	What does ADPCM stand for?(a) address differential pulse code modulation(b) adaptive differential pulse code modulation(c) address dynamic pulse code machine(d) adaptive dynamic pulse code modulationThe question was asked in a national level competition.The origin of the question is Codecs topic in portion Interfacing to the Analog World of Embedded Systems
Answer» The correct ANSWER is (b) ADAPTIVE DIFFERENTIAL pulse code modulation To EXPLAIN: The adaptive differential pulse code modulation is used in telecommunications and is based on non-linear quantisation VALUES.

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following can be used for providing high gain?(a) transistor(b) darlington transistor pair(c) resistor(d) capacitorThe question was asked in an online quiz.My doubt is from Power Controls topic in division Interfacing to the Analog World of Embedded Systems

Which of the following can provide a speed control technique in the DC motor interfacing?(a) PCM(b) DPCM(c) ADPCM(d) PWMI got this question in an online interview.Question is from Power Controls in division Interfacing to the Analog World of Embedded Systems

Which of the following is a current limiting device?(a) voltage(b) current(c) buffer(d) inductorThis question was addressed to me during an interview for a job.My question is taken from Power Controls in section Interfacing to the Analog World of Embedded Systems

How many types of logarithmic codecs are used commonly?(a) 2(b) 3(c) 4(d) 5This question was addressed to me by my school principal while I was bunking the class.Enquiry is from Codecs in chapter Interfacing to the Analog World of Embedded Systems

Which of the following conversion is performed by using a lookup table?(a) DPCM(b) ADPCM(c) Between DPCM and ADPCM(d) Linear cdec and a-lawI have been asked this question in final exam.This interesting question is from Codecs in portion Interfacing to the Analog World of Embedded Systems

What does PCM stand for?(a) pulse codec machine(b) pulse code modulation(c) peripheral code machine(d) peculiar code modulationThe question was posed to me in an interview for internship.My enquiry is from Codecs in portion Interfacing to the Analog World of Embedded Systems

Which codec is used in the UK?(a) a-law(b) µ-law(c) linear codec(d) PCMI got this question in exam.My doubt is from Codecs in section Interfacing to the Analog World of Embedded Systems

Which is the first type of error caused during the conversion process?(a) sampling error(b) interrupt signal(c) counter error(d) quantisation errorThe question was posed to me in unit test.My doubt is from Errors of ADC Technique in section Interfacing to the Analog World of Embedded Systems

Which of the following generates a back EMF?(a) relay(b) buffer(c) transistor(d) FETI got this question in an online interview.My doubt is from Power Controls topic in portion Interfacing to the Analog World of Embedded Systems

Which of the following determines the brightness of LEDs?(a) current(b) voltage(c) resistance(d) conductanceI got this question in an online quiz.I'm obligated to ask this question of Power Controls in section Interfacing to the Analog World of Embedded Systems

Which of the following have a 16-bit digital dynamic range?(a) PCM(b) DPCM(c) linear codec(d) logarithmic codecI got this question by my school teacher while I was bunking the class.Asked question is from Codecs in section Interfacing to the Analog World of Embedded Systems

Which codec is used in digital audio?(a) A-law(b) µ-law(c) linear(d) PCMI had been asked this question during a job interview.The question is from Codecs in portion Interfacing to the Analog World of Embedded Systems

How is the biasing done in LEDs?(a) forward bias(b) no bias(c) supply voltage(d) reverse biasThe question was posed to me during an internship interview.My doubt is from Power Controls topic in portion Interfacing to the Analog World of Embedded Systems

Which of the following allows voltage reversing?(a) H bridge(b) Relays(c) LEDs(d) LCDsThis question was addressed to me during an interview.I'd like to ask this question from Power Controls in division Interfacing to the Analog World of Embedded Systems

Which of the following can determine the maximum frequency that can be converted?(a) sample frequency(b) sample rate(c) sample size(d) sample natureThe question was posed to me in quiz.The doubt is from Errors of ADC Technique in portion Interfacing to the Analog World of Embedded Systems

From which of the following words does codecs is derived?(a) coder(b) decoder(c) coder-decoder(d) coder-encoderThe question was asked during an internship interview.My doubt is from Codecs in chapter Interfacing to the Analog World of Embedded Systems

Which of the following can generate an interrupt?(a) timer(b) trigger(c) delay(d) counterThe question was posed to me during an internship interview.My question comes from Errors of ADC Technique topic in section Interfacing to the Analog World of Embedded Systems

Which of the following is used to create H bridge?(a) switches(b) led(c) capacitor(d) inductorI got this question in quiz.The question is from Power Controls in portion Interfacing to the Analog World of Embedded Systems

Which factor depends on the quantisation error?(a) number of error(b) number of bits(c) size of error(d) conversion processI have been asked this question in examination.This intriguing question comes from Errors of ADC Technique in portion Interfacing to the Analog World of Embedded Systems

Which of the following is used to avoid the back EMF in the relay?(a) resistor(b) capacitor(c) inductor(d) diodeI had been asked this question in an interview.This intriguing question comes from Power Controls topic in chapter Interfacing to the Analog World of Embedded Systems

Which of the following can switch the current by a make or break contact?(a) transistor(b) relay(c) buffer(d) fetThis question was posed to me in unit test.My question comes from Power Controls topic in portion Interfacing to the Analog World of Embedded Systems

Which of the following works by increasing the dynamic range?(a) logarithmic codec(b) linear codec(c) DPCM(d) PCMI got this question during an online exam.This is a very interesting question from Codecs topic in portion Interfacing to the Analog World of Embedded Systems

Which devices are used as indicators in a digital system?(a) LCD(b) LED(c) Varactor diode(d) Gunn diodeThis question was posed to me by my school principal while I was bunking the class.My question is taken from Power Controls in chapter Interfacing to the Analog World of Embedded Systems

Which device can make the PWM operation easier?(a) timer(b) software(c) hardware(d) transistorI have been asked this question in a job interview.This intriguing question originated from Codecs in chapter Interfacing to the Analog World of Embedded Systems

Which is used in the telecommunication applications which has a limited bandwidth of 300 to 3100 HZ?(a) linear codec(b) logarithmic codec(c) PCM(d) DPCMThe question was posed to me in unit test.This question is from Codecs in portion Interfacing to the Analog World of Embedded Systems

Which term determines the random timing error?(a) jitter(b) quantisation error(c) sample error(d) delayThe question was posed to me in exam.The query is from Errors of ADC Technique in division Interfacing to the Analog World of Embedded Systems

Which of the following uses a non-linear quantisation value?(a) PCM(b) DPCM(c) ADPCM(d) linear codecThe question was asked in an interview for job.My question is taken from Codecs topic in section Interfacing to the Analog World of Embedded Systems

Which of the following have the same quantisation step throughout the range?(a) linear(b) PCM(c) DPCM(d) ADPCMI have been asked this question in an interview for job.Origin of the question is Codecs in portion Interfacing to the Analog World of Embedded Systems

Which devices have high drive capability?(a) transistor(b) fet(c) buffer pack(d) darlington amplifierThis question was addressed to me in examination.My enquiry is from Power Controls topic in portion Interfacing to the Analog World of Embedded Systems

Which of the following is used to switch heavy loads?(a) fet(b) transistor(c) buffer pack(d) darlington pairThe question was posed to me in an international level competition.The question is from Power Controls topic in chapter Interfacing to the Analog World of Embedded Systems