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- Question
The timing network that sets the output frequency of a 555 astable circuit contains ________.
Options- A. three external resistors are used
- B. two external resistors and an external capacitor are used
- C. an external resistor and two external capacitors are used
- D. no external resistor or capacitor is required
- Correct Answer
- two external resistors and an external capacitor are used
- 1. A major application for DSP is in ________ and ________ of analog signals.
Options- A. sending, receiving
- B. digitizing, weighting
- C. filtering, conditioning
- D. leveling, translating Discuss
- 2. The speed-power product provides a basis for the comparison of logic circuits when power dissipation and propagation delay are important considerations in the selection of the type of logic to be used.
Options- A. True
- B. False Discuss
- 3. An RC circuit used in a nonretriggerable 74121 one-shot has an REXT of 49 kΩ and a CEXT of 0.2 µF. The pulse width (tW) is approximately ________.
Options- A. 6.9 µs
- B. 6.9 ms
- C. 69 ms
- D. 690 ms Discuss
- 4. To make an eight-bit adder from two four-bit adders you must connect ________.
Options- A. the high-order carry-in to ground
- B. the low-order carry-out to the high-order carry-in
- C. the high-order carry-out to ground
- D. the low-order sum to the high-order data input Discuss
- 5. Output 3 of a 74138 octal decoder is selected when it is enabled by a data input of:
A0 = 1
A1 = 1
A2 = 0
Options- A. True
- B. False Discuss
- 6. A typical AHDL comparator follows an algorithm described as ________.
Options- A. FUNCTION constructs
- B. CASE constructs
- C. IF/ELSE constructs
- D. PROCESS constructs Discuss
- 7. A device that selects one of several inputs to be placed on the output is a multiplexer.
Options- A. True
- B. False Discuss
- 8. PLDs did not gain widespread acceptance with digital until the mid-1980s, when a device called a PAL was introduced.
Options- A. True
- B. False Discuss
- 9. Information that is stored in an EEPROM ________.
Options- A. can be modified by performing a memory write operation
- B. is stored by the manufacturer and cannot be changed
- C. is lost if power is interrupted
- D. can be erased by applying high voltage to each storage location Discuss
- 10. The 555 timer can be used in either the astable or monostable modes.
Options- A. True
- B. False Discuss
More questions
Correct Answer: filtering, conditioning
Correct Answer: True
Correct Answer: 6.9 ms
Correct Answer: the low-order carry-out to the high-order carry-in
Correct Answer: True
Correct Answer: IF/ELSE constructs
Correct Answer: True
Correct Answer: False
Correct Answer: can be erased by applying high voltage to each storage location
Correct Answer: True
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