Shift Registers problems
- 1. With a 50 kHz clock frequency, six bits can be serially entered into a shift register in ________.
Options- A. 12 µs
- B. 120 µs
- C. 12 ms
- D. 120 ms Discuss
Correct Answer: 120 µs
- 2. Ring shift and Johnson counters are:
Options- A. synchronous counters
- B. aynchronous counters
- C. true binary counters
- D. synchronous and true binary counters Discuss
Correct Answer: synchronous counters
- 3. How is a strobe signal used when serially loading a shift register?
Options- A. to turn the register on and off
- B. to control the number of clocks
- C. to determine which output Qs are used
- D. to determine the FFs that will be used Discuss
Correct Answer: to control the number of clocks
- 4. What is a shift register that will accept a parallel input, or a bidirectional serial load and internal shift features, called?
Options- A. tristate
- B. end around
- C. universal
- D. conversion Discuss
Correct Answer: universal
- 5. On the fifth clock pulse, a 4-bit Johnson sequence is Q0 = 0, Q1 = 1, Q2 = 1, and Q3 = 1. On the sixth clock pulse, the sequence is ________.
Options- A. Q0 = 1, Q1 = 0, Q2 = 0, Q3 = 0
- B. Q0 = 1, Q1 = 1, Q2 = 1, Q3 = 0
- C. Q0 = 0, Q1 = 0, Q2 = 1, Q3 = 1
- D. Q0 = 0, Q1 = 0, Q2 = 0, Q3 = 1 Discuss
Correct Answer: Q0 = 0, Q1 = 0, Q2 = 1, Q3 = 1
- 6. Which type of device may be used to interface a parallel data format with external equipment's serial format?
Options- A. key matrix
- B. UART
- C. memory chip
- D. series in, parallel out Discuss
Correct Answer: UART
- 7. A 4-bit shift register that receives 4 bits of parallel data will shift to the ________ by ________ position(s) for each clock pulse.
Options- A. right, one
- B. right, two
- C. left, one
- D. left, three Discuss
Correct Answer: right, one
- 8. By adding recirculating lines to a 4-bit parallel-in, serial-out shift register, it becomes a ________, ________, and ________-out register.
Options- A. parallel-in, serial, parallel
- B. serial-in, parallel, serial
- C. series-parallel-in, series, parallel
- D. bidirectional in, parallel, series Discuss
Correct Answer: parallel-in, serial, parallel
- 9. What is the function of a buffer circuit?
Options- A. to provide an output that is inverted from that on the input
- B. to provide an output that is equal to its input
- C. to clean up the input
- D. to clean up the output Discuss
Correct Answer: to provide an output that is equal to its input
- 10. How many clock pulses will be required to completely load serially a 5-bit shift register?
Options- A. 2
- B. 3
- C. 4
- D. 5 Discuss
Correct Answer: 5
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