Sequential Logic Circuits MCQs

Question 1

What is meant by parallel-loading the register?

Accepted Answer

Loading data in all four flip-flops at the same time

Answer

Shifting the data in all flip-flops simultaneously

Answer

Loading data in two of the flip-flops

Answer

Momentarily disabling the synchronous SET and RESET inputs

Question 2

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

Accepted Answer

bidirectional universal

Answer

tri-state

Answer

end around

Answer

conversion

Question 3

What happens to the parallel output word in an asynchronous binary down counter whenever a clock pulse occurs?

Accepted Answer

The output word decreases by 1.

Answer

The output word decreases by 2.

Answer

The output word increases by 1.

Answer

The output word increases by 2.

Question 4

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

Accepted Answer

digital clocks

Answer

frequency counters

Answer

multiplexed displays

Answer

power consumption meters

Question 5

Synchronous construction reduces the delay time of a counter to the delay of __________.

Accepted Answer

a single flip-flop and a gate

Answer

all flip-flops and gates

Answer

all flip-flops and gates after a 3 count

Answer

a single gate

Question 6

A 4-bit PISO shift register that receives 4 bits of parallel data will shift to the ________ by ________ position(s) for each clock pulse.

Accepted Answer

right, one

Answer

right, two

Answer

left, one

Answer

left, three

Question 7

In order to use a shift register as a counter, ________.

Accepted Answer

the serial output of the register is connected back to the serial input of the register

Answer

the register's serial input is the counter input and the serial output is the counter output

Answer

the parallel inputs provide the input signal and the output signal is taken from the serial data output

Answer

a serial-in, serial-out register must be used

Question 8

A sequence of equally spaced timing pulses may be easily generated by a(n) __________.

Accepted Answer

ring counter

Answer

johnson counter

Answer

binary up counter

Answer

ripple counter

Question 9

Asynchronous counters are often called ________ counters.

Accepted Answer

ripple

Answer

toggle

Answer

binary

Answer

flip-flop