**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**

- 0.01220

- 0.04882

- 0.02441

- 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**

- 16

- 9

- 10
- 8

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

- 1.6 V

- 50 mV

- 0.625 V
- 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**

- 01100100

- 01110001

- 10100101
- 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**

- 0 V

- 0.5 V

- 1.0 V
- 2.0 V

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

- 0.7525 V

- 0.752 V

- 0.075 V
- 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?**

- 2.3333 V

- 2.4444 V

- 2.5556 V
- 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**

- 0.25% and 30 mV
- 0.39% and 30 mV
- 0.25% and 39 mV
- 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?**

- 2 and 3 only
- 1 and 4 only
- 2 and 4 only
- 1 and 3 only