Shift Registers Questions and Answers
Shift Registers are sequential logic circuits used for data storage and transfer in digital systems. This topic includes digital electronics aptitude questions and answers on serial-in serial-out, parallel-in parallel-out, and bidirectional shift registers. These questions, frequently asked in GATE, DRDO, and ISRO exams, test your conceptual clarity and circuit understanding. Practice these Shift Registers questions with answers to enhance your digital electronics knowledge and improve your competitive exam readiness.
Shift Registers
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69 questions
31. In a parallel in/parallel out shift register, D0 = 1, D1 = 1, D2 = 1, and D3 = 0. After three clock pulses, the data outputs are ________.
- 1110
- 0001
- 1100
- 1000
32. The group of bits 10110111 is serially shifted (right-most bit first) into an 8-bit parallel output shift register with an initial state 11110000. After two clock pulses, the register contains ________.
- 10111000
- 10110111
- 11110000
- 11111100
33. By adding recirculating lines to a 4-bit parallel-in, serial-out shift register, it becomes a ________, ________, and ________-out register.
- parallel-in, serial, parallel
- serial-in, parallel, serial
- series-parallel-in, series, parallel
- bidirectional in, parallel, series
34. What type of register would have a complete binary number shifted in one bit at a time and have all the stored bits shifted out one at a time?
- parallel-in, parallel-out
- parallel-in, serial-out
- serial-in, parallel-out
- serial-in, serial-out
35. When an 8-bit serial in/serial out shift register is used for a 20 s time delay, the clock frequency is ________.
- 40 kHz
- 50 kHz
- 400 kHz
- 500 kHz
36. Ring shift and Johnson counters are:
- synchronous counters
- aynchronous counters
- true binary counters
- synchronous and true binary counters
37. What is the difference between a shift-right register and a shift-left register?
- There is no difference.
- the direction of the shift
38. What is a transceiver circuit?
- a buffer that transfers data from input to output
- a buffer that transfers data from output to input
- a buffer that can operate in both directions
39. 74HC195 4-bit parallel access shift register can be used for ________.
- serial in/serial out operation
- serial in/parallel out operation
- parallel in/serial out operation
- all of the above
40. Which type of device may be used to interface a parallel data format with external equipment's serial format?
- key matrix
- UART
- memory chip
- series in, parallel out