Sequential Logic Circuits MCQs

Question 1

A ripple counter's speed is limited by the propagation delay of:

Accepted Answer

each flip-flop

Answer

all flip-flops and gates

Answer

the flip-flops only with gates

Answer

only circuit gates

Question 2

To operate correctly, starting a ring counter requires:

Accepted Answer

presetting one flip-flop and clearing all the others

Answer

clearing all the flip-flops

Answer

clearing one flip-flop and presetting all the others

Answer

presetting all the flip-flops

Question 3

What type of register would shift a complete binary number in one bit at a time and shift all the stored bits out one bit at a time?

Accepted Answer

SISO

Answer

PIPO

Answer

SIPO

Answer

PISO

Question 4

Synchronous counters eliminate the delay problems encountered with asynchronous (ripple) counters because the:

Accepted Answer

input clock pulses are applied simultaneously to each stage

Answer

input clock pulses are applied only to the first and last stages

Answer

input clock pulses are applied only to the last stage

Answer

input clock pulses are not used to activate any of the counter stages

Question 5

One of the major drawbacks to the use of asynchronous counters is that:

Accepted Answer

high-frequency applications are limited because of internal propagation delays

Answer

low-frequency applications are limited because of internal propagation delays

Answer

Asynchronous counters do not have major drawbacks and are suitable for use in high- and low-frequency counting applications.

Answer

Asynchronous counters do not have propagation delays, which limits their use in high-frequency applications.

Question 6

Which type of device may be used to interface a parallel data format with external equipment's serial format?

Accepted Answer

UART

Answer

key matrix

Answer

memory chip

Answer

serial-in, parallel-out

Question 7

When the output of a tri-state shift register is disabled, the output level is placed in a:

Accepted Answer

float state and a high impedance state

Answer

float state

Answer

LOW state

Answer

high impedance state

Question 8

A comparison between ring and johnson counters indicates that:

Accepted Answer

a johnson counter has an inverted feedback path

Answer

a ring counter has fewer flip-flops but requires more decoding circuitry

Answer

a ring counter has an inverted feedback path

Answer

a johnson counter has more flip-flops but less decoding circuitry

Question 9

A sequence of equally spaced timing pulses may be easily generated by which type of counter circuit?

Accepted Answer

shift register sequencer

Answer

clock

Answer

johnson

Answer

binary