1. Which of following is not a type of ADC?

(a) Flash ADC

(b) Dual slope ADC

(c) Recessive approximation ADC

(d) sigma-delta ADC

2. A DAC is a

(a) digital-to-analog computer

(b) digital analysis calculator

(c) data accumulation converter

(d) digital-to-analog converter

3. The throughput of a flash ADC is measured in

(a) displacement per second

(b) distance per second

(c) samples per minute

(d) samples per second

4. A digital voltmeter uses a

(a) flash ADC

(b) successive approximation ADC

(c) sigma-delta ADC

(d) dual-slope ADC

5. The most common ADC seen in telecommunications based on audio signals is

(a) flash ADC
(b) successive approximation ADC
(c) sigma-delta ADC
(d) dual-slope ADC

6. In a binary weighted DAC, the lowest-value resistor corresponds to

(a) the highest binary weighted input
(b) the lowest binary weighted input
(c) the first input
(d) the last input

7. The resolution of a 12-bit Analog to Digital converter in percent is

1. 0.01220
   
2. 0.04882
   
3. 0.02441
   
4. 0.09760

8. An n-bit Analog to Digital converter is required to convert analog input in the range (0-5) V to an accuracy of 10 mV. The value of n should be

1. 16
   
2. 9
   
3. 10
4. 8

9. What is the value of LSB of an 8 bit digital to analog converter for 0- 12.8 V range?

1. 1.6 V
   
2. 50 mV
   
3. 0.625 V
4. 1.28 V

10. A 8-bit analog to digital converter is used over a span of zero to 2.56 V. The binary representation of 1.0 V signal is

1. 01100100
   
2. 01110001
   
3. 10100101
4. 10100010

11. An analog voltage in the range of 0-8 V is divided in eight equal intervals for conversion to 3-bit
digital output. The maximum quantization error

1. 0 V
   
2. 0.5 V
   
3. 1.0 V
4. 2.0 V

12. A 4½ digit voltmeter is used for voltage measurement. How would 0.7525 V be displayed in 1 V range?

1. 0.7525 V
   
2. 0.752 V
   
3. 0.075 V
4. 0.0752 V

13. What is the analog output for a 4-bit R-2R ladder digital to analog converter when input is (1000)₂, for V_ref = 5 V?

1. 2.3333 V
   
2. 2.4444 V
   
3. 2.5556 V
4. 2.6667 V

14. An 8-bit digital to analog converter uses a ladder network. The full-scale output voltage of the converter is +10 V. The resolution expressed in percentage and in volts is, respectively

1. 0.25% and 30 mV
2. 0.39% and 30 mV
3. 0.25% and 39 mV
4. 0.39% and 39 mV

15. Consider the following statements:

1. Flash type ADCS are considered the fastest.

2. In successive approximation type ADCS, conversion time depends upon the magnitude of the analog voltage.

3. Counter-type ADCS work with fixed conversion time.

4. Dual slope ADCS are considered the slowest.

Which of the above statements are correct?

1. 2 and 3 only
2. 1 and 4 only
3. 2 and 4 only
4. 1 and 3 only