Top 350+ Solved Digital Electronics MCQ Questions Answer
Q. A shift register that will accept a parallel input or a bidirectional serial load and internal shift features is called as?
a. tristate
b. end around
c. universal
d. conversion
Q. How can parallel data be taken out of a shift register simultaneously?
a. use the q output of the first ff
b. use the q output of the last ff
c. tie all of the q outputs together
d. use the q output of each ff
Q. What is meant by parallel load of a shift register?
a. all ffs are preset with data
b. each ff is loaded with data, one at a time
c. parallel shifting of data
d. all ffs are set with data
Q. An 8-bit serial in/serial out shift register is used with a clock frequency of 2 MHz to achieve a time delay (td) of
a. 16 us
b. 8 us
c. 4 us
d. 2 us
Q. A sequence of equally spaced timing pulses may be easily generated by which type of counter circuit?
a. ring shift
b. clock
c. johnson
d. binary
Q. How is an strobe signal used when serially loading a shift register?
a. to turn the register on and off
b. to control the number of clocks
c. to determine which output qs are used
d. to determine the ffs that will be used
Q. An 8-bit serial in/serial out shift register is used with a clock frequency of 150 kHz. What is the time delay between the serial input and the Q3 output?
a. 1.67 s
b. 26.67 s
c. 26.7 ms
d. 267 ms
Q. What are the three output conditions of a three-state buffer?
a. high, low, float
b. high-z, 0, float
c. negative, positive, 0
d. 1, low-z, float
Q. The primary purpose of a three-state buffer is usually
a. to provide isolation between the input device and the data bus
b. to provide the sink or source current required by any device connected to its output without loading down the output device
c. temporary data storage
d. to control data flow
Q. What is the difference between a ring shift counter and a Johnson shift counter?
a. there is no difference
b. a ring is faster
c. the feedback is reversed
d. the johnson is faster