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- Question
In a 4-bit R/2R ladder digital-to-analog converter, because of negative feedback, the operational amplifier keeps the inverting (minus) input near ________.
Options- A. 5 volts
- B. zero volts
- C. a voltage determined by the binary weighted input
- D. none of the above
- Correct Answer
- zero volts
- 1. The primary disadvantage of the simultaneous A/D converter is ________.
Options- A. that it requires the input voltage to be applied to the inputs simultaneously
- B. the long conversion time required
- C. the large number of output lines required to simultaneously decode the input voltage
- D. the large number of comparators required to represent a reasonable-sized binary number Discuss
- 2. An offset error in a DAC will show up as an incorrect analog output ________.
Options- A. only for higher value inputs
- B. only for lower value inputs
- C. only for certain (scattered) inputs
- D. for all inputs Discuss
- 3. The principal advantage of the three-wire handshake on the GPIB is that it ________.
Options- A. is faster than two-wire methods
- B. allows fast and slow listeners on the same bus
- C. can be used over very long distances
- D. is compatible with the RS232C standard Discuss
- 4. When both inputs of a J-K pulse-triggered FF are high and the clock cycles, the output will ________.
Options- A. be invalid
- B. not change
- C. remain unchanged
- D. toggle Discuss
- 5. In a binary-weighted D/A converter the sum of all the currents from the binary weighted resistors flows through the operational amplifier.
Options- A. True
- B. False Discuss
- 6. PMOS and NMOS ________.
Options- A. represent MOSFET devices utilizing either P-channel or N-channel devices exclusively within a given gate
- B. are enhancement-type CMOS devices used to produce a series of high-speed logic known as 74HC
- C. represent positive and negative MOS-type devices, which can be operated from differential power supplies and are compatible with operational amplifiers
- D. None of the above Discuss
- 7. An open-collector TTL gate ________.
Options- A. can source current but cannot sink current
- B. can sink current but cannot source current
- C. cannot source or sink current
- D. can sink more current than a standard TTL gate Discuss
- 8. When data input I5 of a 74148 octal-to-binary encoder is active, the data output is:
A0 = 1
A1 = 0
A2 = 0
Options- A. True
- B. False Discuss
- 9. If data is brought into the J terminal and its complement to the K terminal, a J-K flip-flop operates as a(n) ________.
Options- A. S-C flip-flop
- B. D flip-flop
- C. gated S-C flip-flop
- D. TOGGLE flip-flop Discuss
- 10. The primary use for Gray code is:
Options- A. coded representation of a shaft's mechanical position
- B. turning on/off software switches
- C. to represent the correct ASCII code to indicate the angular position of a shaft on rotating machinery
- D. to convert the angular position of a shaft on rotating machinery into hexadecimal code Discuss
More questions
Correct Answer: the large number of comparators required to represent a reasonable-sized binary number
Correct Answer: for all inputs
Correct Answer: allows fast and slow listeners on the same bus
Correct Answer: toggle
Correct Answer: False
Correct Answer: represent MOSFET devices utilizing either P-channel or N-channel devices exclusively within a given gate
Correct Answer: can sink current but cannot source current
Correct Answer: False
Correct Answer: D flip-flop
Correct Answer: coded representation of a shaft's mechanical position
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