# Sequential Logic Circuits MCQ Questions & Answers

Sequential Logic Circuits MCQs : This section focuses on the "Sequential Logic Circuits". These Multiple Choice Questions (MCQs) should be practiced to improve the Sequential Logic Circuits skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

A comparison between ring and johnson counters indicates that:

A. a ring counter has fewer flip-flops but requires more decoding circuitry
B. a ring counter has an inverted feedback path
C. a johnson counter has more flip-flops but less decoding circuitry
D. a johnson counter has an inverted feedback path

Question 2

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

A. low-frequency applications are limited because of internal propagation delays
B. high-frequency applications are limited because of internal propagation delays
C. Asynchronous counters do not have major drawbacks and are suitable for use in high- and low-frequency counting applications.
D. Asynchronous counters do not have propagation delays, which limits their use in high-frequency applications.

Question 3

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

A. shift register sequencer
B. clock
C. johnson
D. binary

Question 4

What is a shift register that will accept a parallel input and can shift data left or right called?

A. tri-state
B. end around
C. bidirectional universal
D. conversion

Question 5

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

A. float state
B. LOW state
C. high impedance state
D. float state and a high impedance state

Question 6

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

A. input clock pulses are applied only to the first and last stages
B. input clock pulses are applied only to the last stage
C. input clock pulses are not used to activate any of the counter stages
D. input clock pulses are applied simultaneously to each stage

Question 7

A. Shifting the data in all flip-flops simultaneously
D. Momentarily disabling the synchronous SET and RESET inputs

Question 8

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

A. each flip-flop
B. all flip-flops and gates
C. the flip-flops only with gates
D. only circuit gates

Question 9

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?

A. PIPO
B. SISO
C. SIPO
D. PISO

Question 10

Mod-6 and mod-12 counters are most commonly used in:

A. frequency counters
B. multiplexed displays
C. digital clocks
D. power consumption meters

Question 11

To operate correctly, starting a ring counter requires:

A. clearing all the flip-flops
B. presetting one flip-flop and clearing all the others
C. clearing one flip-flop and presetting all the others
D. presetting all the flip-flops

Question 12

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

A. key matrix
B. UART
C. memory chip
D. serial-in, parallel-out