Data Conversion – 3 MCQ’s

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This set of Avionics Multiple Choice Questions & Answers (MCQs) focuses on “Data Conversion – 3″.

1. Pick the odd one out?
a) R-2R converters
b) String converters
c) Weighted current source converters
d) Flash conversion

2. Which of the following does not belong to the R-2R converter?
a) Reference regulators
b) Resistor network
c) Electronic switches
d) Input amplifiers

3. Which of the following is not an advantage of undersampling?
a) Slower ADC
b) Less power
c) Fast microprocessors
d) Low memory capacity

4. What is the resolution of a sting DAC if the reference voltage is 10V and the number of input bits is 3?
a) 1.25V
b) 1.75V
c) 1.23V
d) 0.25V

5. Settling time is the time taken to convert one binary data into analog.
a) True
b) False

6. During the sample mode the sample and hold circuit passes the analog signal unchanged.
a) True
b) False

7. What is the alias produced when a signal of 15 MHz is sampled at a rate of 28 MHz?
a) 10MHz
b) 11MHz
c) 12MHz
d) 13MHz

8. What is the maximum operation frequency that can be used if the settling time is 100ns?
a) 10MHz
b) 11MHz
c) 12MHz
d) 13MHz

9. Which of the following is the fastest type of ADC?
a) Successive approximation conversion
b) Flash conversion
c) Delta encoded conversion
d) Pipelined conversion

10. What is the dynamic range of a 12 bit converter?
a) 81.5dB
b) 72.24dB
c) 62.35dB
d) 10.254dB

11. Find the resolution of an ADC which uses 14 bit numbers and have a voltage range of -6V to +6V?
a) 845.65μV
b) 3.56μV
c) 0.00154μV
d) 732.5μV

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