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
11. A modulus-12 ring counter requires a minimum of ________.
- 10 flip-flops
- 12 flip-flops
- 6 flip-flops
- 2 flip-flops
12. Stepper motors have become popular in digital automation systems because ________.
- of their low cost
- they are driven by sequential digital signals
- they can be used to provide repetitive mechanical movement
- they are driven by sequential digital signals and can be used to provide repetitive mechanical movement
13. The group of bits 11001 is serially shifted (right-most bit first) into a 5-bit parallel output shift register with an initial state 01110. After three clock pulses, the register contains ________.
- 01110
- 00001
- 00101
- 00110
14. Assume that a 4-bit serial in/serial out shift register is initially clear. We wish to store the nibble 1100. What will be the 4-bit pattern after the second clock pulse? (Right-most bit first.)
- 1100
- 0011
- 0000
- 1111
15. A serial in/parallel out, 4-bit shift register initially contains all 1s. The data nibble 0111 is waiting to enter. After four clock pulses, the register contains ________.
- 0000
- 1111
- 0111
- 1000
16. With a 200 kHz clock frequency, eight bits can be serially entered into a shift register in ________.
- 4 µs
- 40 µs
- 400 µs
- 40 ms
17. An 8-bit serial in/serial out shift register is used with a clock frequency of 2 MHz to achieve a time delay (td) of ________.
- 16 s
- 8 s
- 4 s
- 2 s
18. A sequence of equally spaced timing pulses may be easily generated by which type of counter circuit?
- ring shift
- clock
- Johnson
- binary
19. The bit sequence 10011100 is serially entered (right-most bit first) into an 8-bit parallel out shift register that is initially clear. What are the Q outputs after four clock pulses?
- 10011100
- 11000000
- 00001100
- 11110000
20. If an 8-bit ring counter has an initial state 10111110, what is the state after the fourth clock pulse?
- 11101011
- 00010111
- 11110000
- 00000000