Shift Registers Objective type questions:

Q.1 A group of flip-flops used to store one bit of information is called as 
a) Registers
b) Counters
c) Shift Registers
d) Multiplexers

Answer: a

Q.2 The full form of SISO is
a) Serial in parallel out
b) Parallel in serial out
c) Serial in serial out
d) Serial in sequential out

Answer: c

Q.3 Which flip-flop comprises of shift registers?
a) D flip-flop
b) T flip-flop
c) J-K flip-flop
d) S-R flip-flop

Answer: a

Q.4 The time taken by shift registers to transfer the content is called as _________.
a) Duration
b) Clock Duration
c) Bit Duration
d) Word Duration

Answer: d

Q.5 One bit information is transferred at a time is called _________.
a) Shifting
b) Serial Transfer
c) Parallel Transfer
d) Rotating

Answer: b

Q.6 The following mode is used as control inputs to a 4-bit universal shift register.
a) Loopback mode
b) Serial input mode
c) Parallel load mode
d) All of the above

Answer: c

Q.7 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 ________
a) 00101
b) 00110
c) 01110
d) 00010

Answer: a
Explanation: LSB bit is inverted and feed back to MSB:
01110->initial
10111->first clock pulse
01011->second
00101->third.

Q.8 With a 200 kHz clock frequency, eight bits can be serially entered into a shift register in ________.
a) 400µs
b) 40µs
c) 4µs
d) 40ms

Answer: b
Explanation: f = 200 KHZ; T = (1/200) m sec = (1/0.2) micro-sec = 5 micro-sec;
In serial transmission, data enters one bit at a time. After 8 clock cycles only 8 bit will be loaded = 8 * 5 = 40 micro-sec.

Q.9 In a single clock cycle, multiple shift operations can be performed by using
a) Serial Shift Registers
b) Parallel Shift Registers
c) Phased Locked Loop (PLL)
d) Barrier Shift Registers

Answer: b

Q.10 The number of flip-flops used in the construction of an 8 bit shift register will be _______.
a) 32
b) 16
c) 8
d) 4

Answer: c

These are most asked Digital Electronics Shift Registers mcqs with answers and most important digital electronics interview and Viva question.
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