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- Question
Which of the statements below best describes the basic operation of a dual-slope A/D converter?
Options- A. The input voltage is used to set the frequency of a voltage-controlled oscillator (VCO). The VCO quits changing frequency when the input voltage stabilizes. The frequency of the VCO, which is proportional to the analog input voltage, is measured and is displayed on the digital display as a voltage reading.
- B. A ramp generator is used to enable a counter through a comparator. When the ramp voltage equals the input voltage, the counter is latched and then reset. The counter reading is proportional to the input voltage since the ramp is changing at a constant V/second rate.
- C. A ramp voltage and analog input voltage are applied to a comparator. As the input voltage causes the integrating capacitor to charge, it will at some point equal the ramp voltage. The ramp voltage is measured and displayed on the digital panel meter.
- D. Two ramps are generated: one by the input voltage and the other by a reference voltage. The input voltage ramp charges the integrating capacitor, while the reference voltage discharges the capacitor and enables the counter until the capacitor is discharged, at which time the counter value is loaded into the output latches.
- Correct Answer
- Two ramps are generated: one by the input voltage and the other by a reference voltage. The input voltage ramp charges the integrating capacitor, while the reference voltage discharges the capacitor and enables the counter until the capacitor is discharged, at which time the counter value is loaded into the output latches.
- 1. One example of the use of an S-R flip-flop is as a(n):
Options- A. racer
- B. astable oscillator
- C. binary storage register
- D. transition pulse generator Discuss
- 2. Packages are used to contain ________ and other information that must be available to all entities in the design file.
Options- A. types
- B. vectors
- C. components
- D. variables Discuss
- 3. A method of converting decimal to binary is by successive division.
Options- A. True
- B. False Discuss
- 4. A plot of voltage versus time is called a timing diagram.
Options- A. True
- B. False Discuss
- 5. Convert 11001010001101012 to hexadecimal.
Options- A. 121035
- B. CA35
- C. 53AC1
- D. 530121 Discuss
- 6. There are four possible combinations for subtracting two binary numbers.
Options- A. True
- B. False Discuss
- 7. A truth table with output columns numbered 0?15 may be for which type of decoder IC?
Options- A. hexadecimal 1-of-16
- B. dual octal outputs
- C. binary-to-hexadecimal
- D. hexadecimal-to-binary Discuss
- 8. What is the indication of a short to ground in the output of a driving gate?
Options- A. Only the output of the defective gate is affected.
- B. There is a signal loss to all load gates.
- C. The node may be stuck in either the HIGH or the LOW state.
- D. The affected node will be stuck in the HIGH state. Discuss
- 9. The storage element for a static RAM is the ________.
Options- A. diode
- B. resistor
- C. capacitor
- D. flip-flop Discuss
- 10. In the keypad encoder, the ________ detects when a key is pressed.
Options- A. ring counter
- B. MOD-6 counter
- C. BCD counter
- D. freeze bit Discuss
More questions
Correct Answer: binary storage register
Correct Answer: components
Correct Answer: True
Correct Answer: True
Correct Answer: CA35
Correct Answer: True
Correct Answer: hexadecimal 1-of-16
Correct Answer: There is a signal loss to all load gates.
Correct Answer: flip-flop
Correct Answer: freeze bit
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