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- Question
Which of the following choices meets the minimum requirement needed to create specialized waveforms that are used in digital control and sequencing circuits?
Options- A. basic gates, a clock oscillator, and a repetitive waveform generator
- B. basic gates, a clock oscillator, and a Johnson shift counter
- C. basic gates, a clock oscillator, and a DeMorgan pulse generator
- D. basic gates, a clock oscillator, a repetitive waveform generator, and a Johnson shift counter
- Correct Answer
- basic gates, a clock oscillator, and a repetitive waveform generator
- 1. How is a J-K flip-flop made to toggle?
Options- A. J = 0, K = 0
- B. J = 1, K = 0
- C. J = 0, K = 1
- D. J = 1, K = 1 Discuss
- 2. The following combination is correct for an ODD parity data transmission system:
data = 011011100 and parity = 0
Options- A. True
- B. False Discuss
- 3. A major disadvantage of the mask ROM is that it:
Options- A. is time consuming to change the stored data when system requirements change
- B. is very expensive to change the stored data when system requirements change
- C. cannot be reprogrammed if stored data needs to be changed
- D. has an extremely short life expectancy and requires frequent replacement Discuss
- 4. One disadvantage of the tracking A/D converter is:
Options- A. that it requires two counters?one for up and one for down.
- B. that the binary output will oscillate between two binary states when the analog input is constant.
- C. the need for an accurate clock reference for the counter.
- D. the need for a latch and its associated control circuit. Discuss
- 5. Hexadecimal 44 is ________ in decimal.
Options- A. 6810
- B. 7410
- C. 7710
- D. 9810 Discuss
- 6. The CPU contains all the circuitry for ________.
Options- A. storing data
- B. keeping track of time
- C. fetching and interpreting instructions
- D. Internet operations Discuss
- 7. The Q output of a flip-flop is normally HIGH when the device is in the "CLEAR" or "RESET" state.
Options- A. True
- B. False Discuss
- 8. What must be done to interface TTL to CMOS?
Options- A. A dropping resistor must be used on the CMOS 12 V supply to reduce it to 5 V for the TTL.
- B. As long as the CMOS supply voltage is 5 V, they can be interfaced; however, the fan-out of the TTL is limited to five CMOS gates.
- C. A 5 V Zener diode must be placed across the inputs of the TTL gates in order to protect them from the higher output voltages of the CMOS gates.
- D. A pull-up resistor must be used between the TTL output-CMOS input node and Vcc; the value of RP will depend on the number of CMOS gates connected to the node. Discuss
- 9. The input levels to a flip-flop must be maintained for a minimum time period both before and after the edge of the clock signal is applied.
Options- A. True
- B. False Discuss
- 10. A Celsius thermometer is an application for the 8051 microcontroller.
Options- A. True
- B. False Discuss
More questions
Correct Answer: J = 1, K = 1
Correct Answer: True
Correct Answer: cannot be reprogrammed if stored data needs to be changed
Correct Answer: that the binary output will oscillate between two binary states when the analog input is constant.
Correct Answer: 6810
Correct Answer: fetching and interpreting instructions
Correct Answer: False
Correct Answer: A pull-up resistor must be used between the TTL output-CMOS input node and Vcc; the value of RP will depend on the number of CMOS gates connected to the node.
Correct Answer: True
Correct Answer: True
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