On the fifth clock pulse, a 4-bit Johnson sequence is Q 0 = 0, Q 1 = 1, Q 2 = 1, and Q 3 =On the sixth clock pulse, the sequence is ________.

Q 0 = 0, Q 1 = 0, Q 2 = 1, Q 3 = 1

Q 0 = 1, Q 1 = 0, Q 2 = 0, Q 3 = 0

Q 0 = 1, Q 1 = 1, Q 2 = 1, Q 3 = 0

Q 0 = 0, Q 1 = 0, Q 2 = 0, Q 3 = 1

On the third clock pulse, a 4-bit Johnson sequence is Q 0 = 1, Q 1 = 1, Q 2 = 1, and Q 3 =On the fourth clock pulse, the sequence is ________.

Q 0 = 1, Q 1 = 1, Q 2 = 1, Q 3 = 1

Q 0 = 1, Q 1 = 1, Q 2 = 0, Q 3 = 0

Q 0 = 1, Q 1 = 0, Q 2 = 0, Q 3 = 0

Q 0 = 0, Q 1 = 0, Q 2 = 0, Q 3 = 0

Practice Shift Registers Multiple Choice Questions Quiz-3

Q.1

What is the function of a buffer circuit?

to provide an output that is inverted from that on the input
to provide an output that is equal to its input
to clean up the input
to clean up the output

Q.2

What is the preset condition for a ring shift counter?

all FFs set to 1
all FFs cleared to 0
a single 0, the rest 1
a single 1, the rest 0

Q.3

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

Q.4

Which is not characteristic of a shift register?

Serial in/parallel in
Serial in/parallel out
Parallel in/serial out
Parallel in/parallel out

Q.5

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.

Q.6

To keep output data accurate, 4-bit series-in, parallel-out shift registers employ a ________.

divide-by-4 clock pulse
sequence generator
strobe line
multiplexer

Q.7

What is a recirculating register?

serial out connected to serial in
all Q outputs connected together
a register that can be used over again

Q.8

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

Q.9

On the fifth clock pulse, a 4-bit Johnson sequence is Q₀ = 0, Q₁ = 1, Q₂ = 1, and Q₃ =On the sixth clock pulse, the sequence is ________.

Q₀ = 1, Q₁ = 0, Q₂ = 0, Q₃ = 0
Q₀ = 1, Q₁ = 1, Q₂ = 1, Q₃ = 0
Q₀ = 0, Q₁ = 0, Q₂ = 1, Q₃ = 1
Q₀ = 0, Q₁ = 0, Q₂ = 0, Q₃ = 1

Q.10

The bit sequence 0010 is serially entered (right-most bit first) into a 4-bit parallel out shift register that is initially clear. What are the Q outputs after two clock pulses?

0000
0010
1000
1111

Q.11

What is a shift register that will accept a parallel input, or a bidirectional serial load and internal shift features, called?

tristate
end around
universal
conversion

Q.12

On the third clock pulse, a 4-bit Johnson sequence is Q₀ = 1, Q₁ = 1, Q₂ = 1, and Q₃ =On the fourth clock pulse, the sequence is ________.

Q₀ = 1, Q₁ = 1, Q₂ = 1, Q₃ = 1
Q₀ = 1, Q₁ = 1, Q₂ = 0, Q₃ = 0
Q₀ = 1, Q₁ = 0, Q₂ = 0, Q₃ = 0
Q₀ = 0, Q₁ = 0, Q₂ = 0, Q₃ = 0

Q.13

A bidirectional 4-bit shift register is storing the nibbleIts input is HIGH. The nibble 1011 is waiting to be entered on the serial data-input line. After three clock pulses, the shift register is storing ________.

1101
0111
0001
1110

Q.14

A 4-bit ring counter is loaded with a singleThe frequency of any given output is ________.

the same as the clock
twice the clock frequency
one-half the clock frequency
one-fourth the clock frequency

Q.15

Assume a LOW logic level is placed on the SHIFT/LOAD input of a 74195 shift register. The output will change ________.

immediately
if the CLOCK is also LOW
on the next clock leading edge
depending on the J and K inputs

Q.16

Shifting a binary number to the left by one position is equivalent to ________.

multiplying by two
multiplying by four
dividing by two
dividing by four

Q.17

Assume a 4-bit Johnson counter is initially cleared. After the first clock pulse the output isAfter the next clock pulse the output will be ________.

0011
0010
1000
0110

Q.18

A type of shift register in which the Q or Q output of one stage is not connected to the input of the next stage is ________.

parallel in/serial out
serial in/parallel out
serial in/serial out
parallel in/parallel out

Q.19

A Johnson counter, constructed with N flip-flops, has how many unique states?

Q.20

Assume a 4-bit parallel in/serial out shift register is loaded with a binary number. How many clock pulses are required after the parallel load has occurred before the first bit in the sequence appears on the serial output line?