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
21. How would a latch circuit be used in a microprocessor system?
- as transportation for Intel employees
- for a group of data that is the same
- as a set of common connections for transfer of data
22. A 4-bit shift register that receives 4 bits of parallel data will shift to the ________ by ________ position(s) for each clock pulse.
- right, one
- right, two
- left, one
- left, three
23. How many clock pulses will be required to completely load serially a 5-bit shift register?
- 2
- 3
- 4
- 5
24. How is a strobe signal used when serially loading a shift register?
- to turn the register on and off
- to control the number of clocks
- to determine which output Qs are used
- to determine the FFs that will be used
25. What are the three output conditions of a three-state buffer?
- HIGH, LOW, float
- 1, 0, float
- both of the above
- neither of the above
26. The primary purpose of a three-state buffer is usually:
- to provide isolation between the input device and the data bus
- to provide the sink or source current required by any device connected to its output without loading down the output device
- temporary data storage
- to control data flow
27. What is the difference between a ring shift counter and a Johnson shift counter?
- There is no difference.
- A ring is faster.
- The feedback is reversed.
- The Johnson is faster.
28. What is a recirculating register?
- serial out connected to serial in
- all Q outputs connected together
- a register that can be used over again
29. When is it important to use a three-state buffer?
- when two or more outputs are connected to the same input
- when all outputs are normally HIGH
- when all outputs are normally LOW
- when two or more outputs are connected to two or more inputs
30. A bidirectional 4-bit shift register is storing the nibble 1110. Its input is LOW. The nibble 0111 is waiting to be entered on the serial data-input line. After two clock pulses, the shift register is storing ________.
- 1110
- 0111
- 1000
- 1001