ADC & Data Acquisition MCQs

Practice ADC & Data Acquisition MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1

Measurements & InstrumentationADC & Data Acquisition

For an ideal 8-bit ADC with a 0 to 5.12 V input range, the nominal LSB step size using 5.12/256 is?

Show AnswerHide Answer Report an error

Correct Answer: B. 20 mV

Explanation: An 8-bit ADC has 256 code intervals in the common idealized calculation, so 5.12/256=0.02 V=20 mV.

Reference: Standard measurements and instrumentation: adc & data acquisition

Question 2

Measurements & InstrumentationADC & Data Acquisition

Show AnswerHide Answer Report an error

Correct Answer: C. 4096

Explanation: A 12-bit converter has 2^12=4096 possible output codes.

Reference: Standard measurements and instrumentation: adc & data acquisition

Question 3

Measurements & InstrumentationADC & Data Acquisition

Show AnswerHide Answer Report an error

Correct Answer: B. 4

Explanation: 2^10/2^8=4, so the number of codes becomes four times larger.

Reference: Standard measurements and instrumentation: adc & data acquisition

Question 4

Measurements & InstrumentationADC & Data Acquisition

Show AnswerHide Answer Report an error

Correct Answer: B. 1/2 LSB

Explanation: For ideal rounding quantization, the error is bounded approximately by ±0.5 LSB.

Reference: Standard measurements and instrumentation: adc & data acquisition

Question 5

Measurements & InstrumentationADC & Data Acquisition

Show AnswerHide Answer Report an error

Correct Answer: A. Binary search

Explanation: A SAR ADC tests bits from MSB to LSB using a comparator and internal DAC, effectively performing a binary search.

Reference: Standard measurements and instrumentation: adc & data acquisition

Question 6

Measurements & InstrumentationADC & Data Acquisition

Show AnswerHide Answer Report an error

Correct Answer: A. Many comparators operating in parallel

Explanation: A flash ADC compares the input against many reference levels simultaneously, giving very fast conversion.

Reference: Standard measurements and instrumentation: adc & data acquisition