A to D Converter – 2 MCQ’s

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This set of Signals & Systems Multiple Choice Questions & Answers (MCQs) focuses on “A to D Converter – 2″.

1. 
If a input at Va is 1010, then find the correct conversion sequence for the given circuit.
a)

Input signalSAR output at different stagescomparator output
101010001
11000
10101
10110
1010

b)

Input signalSAR output at different stagescomparator output
101000010
00101
00110
10101

c)

Input signalSAR output at different stagescomparator output
101011110
10110
10011
10101

d) None of the mentioned

2. The Integrating type converters are used in
a) Digital meter
b) Panel meter
c) Monitoring system
d) All of the mentioned

3. At what condition the digital to analog conversion is made?

Find the condition of conversion from digital to analog

a) Va > Vd
b) Va ≤ Vd
c) Va ≥ Vd
d) Va ≠ Vd

4. In integrating type ADCs, the
a) Input voltage is proportional to input averaged over the integration period
b) Output voltage is proportional to input averaged over the integration period
c) Output voltage is proportional to sum of input voltage
d) Input voltage is proportional to sum of input voltage

5. How to overcome the drawback of the charge balancing ADC?
a) By using precision integrator
b) By using Voltage to frequency converter
c) By using voltage comparator
d) By using dual slope converter

6. In which application dual slop converter are used.
a) Thermocouple
b) Digital panel meter
c) Weighting scale
d) All of the mentioned

7. Which type of ADC is chosen for noisy environment?
a) Successive approximation ADC
b) Dual slope
c) Charge balancing ADC
d) All of the mentioned

8. Which among the following has long conversion time?
a) Servo converter
b) Dual ramp converter
c) Flash converter
d) None of the mentioned

9. A dual slope has the following specifications:
16bit counter; Clock rate =4 MHz; Input voltage=12v; Output voltage =-7v and Capacitor=0.47µF.
If the counters have cycled through 2n counts, determine the value of resistor in the integrator.
a) 60kΩ
b) 50kΩ
c) 120kΩ
d) 100kΩ

10. A 12 bit dual ramp generation has a maximum output voltage of +12v. Compute the equivalent digital number for the analog signal of +6v.
a) 1000000000
b) 10000000000
c) 1000000000000
d) 100000000000

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