ADC, DAC Interfacing MCQ’s

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This set of Microcontroller Multiple Choice Questions & Answers (MCQs) focuses on “ADC, DAC Interfacing”.

1. In an ADC, we can calculate the output voltage from the formula
a) Step size / Vin
b) Step size * Vin
c) Vin / step size
d) Vref / step size

2. ADC0848 is a ____________ bit converter?
a) 16
b) 4
c) 8
d) 48

3. Which of the following is correct about the word resolution in ADC DAC converters in AVR’s?
a) it is the smallest change that can be described by an ADC
b) it is equal to Vref/2n (where n represents the number of bits)
c) it is 0.076mV or 76uV for n=16 and Vref=5V
d) all of the mentioned

4. Which of the following factors can affect the step size calculation?
a) number of bits
b) input current
c) output current
d) all of the mentioned

5. Why do we connect a capacitor between the Vref and the Gnd pin?
a) to remove the leakage
b) to ensure more current at that place
c) to make more Vref
d) to make Vref stable and also to increase the precision of the ADC

6. What is the internal Vref of an Atmega32 series?
a) 5V
b) 3.3V
c) 2.56V
d) all of the mentioned

7. MAX1112 is a _________ type of ADC converter?
a) parallel
b) 12 bit
c) serial
d) all of the mentioned

8. Which of the following are the registers that are used for controlling the ADC conversion in the AVR?
a) ADCSRA
b) ADMUX
c) SPIOR
d) All of the mentioned

9. The output of a DAC0808 is in the form of ____________
a) electrical pulse
b) current
c) voltage
d) all of the mentioned

10. In a DAC the input is ______ and the output is ______
a) analog, digital
b) current, voltage
c) digital, analog
d) analog, current

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