Top 350+ Solved Digital Electronics MCQ Questions Answer
Q. Refer to the given figures (a) and (b). A logic analyzer is used to check the circuit in figure (a) and displays the waveforms shown in figure (b). The actual analyzer display shows all four data outputs, Q0-Q3. The analyzer's cursor is placed at position X and all four of the data output lines show a LOW level output. What is wrong, if anything, with the circuit?
a. nothing is wrong, according to the display. the outputs are in the open state and should show zero output voltage.
b. the circuit is in the read mode and the outputs, q0-q3, should reflect the contents of the memory at that address. the chip is defective; replace the chip.
c. the circuit is in the mode and should be writing the contents of the selected address to q0–q3.
d. the q0–q3 lines can be either low or high, since the chip is in the tristate mode in which case their level is unpredictable.
Q. What is the meaning of RAM, and what is its primary role?
a. readily available memory; it is the first level of memory used by the computer in all of its operations.
b. random access memory; it is memory that can be reached by any sub- system within a computer, and at any time.
c. random access memory; it is the memory used for short-term temporary data storage within the computer.
d. resettable automatic memory; it is memory that can be used and then automatically reset, or cleared, after being read from or written to.
Q. The storage element for a static RAM is the ________.
a. diode
b. resistor
c. capacitor
d. flip-flop
Q. In a DRAM, what is the state of R/W during a read operation?
a. low
b. high
c. hi-z
d. none of the above
Q. The condition occurring when two or more devices try to write data to a bus simultaneously is called ________.
a. address decoding
b. bus contention
c. bus collisions
d. address multiplexing
Q. The difference between a PLA and a PAL is:
a. the pla has a programmable or plane and a programmable and plane, while the pal only has a programmable and plane.
b. the pal has a programmable or plane and a programmable and plane, while the pla only has a programmable and plane.
c. the pal has more possible product terms than the pla.
d. pals and plas are the same thing.
Q. ALM is the acronym for ________.
a. array logic matrix
b. arithmetic logic module
c. asynchronous local modulator
d. adaptive logic module
Q. The GAL16V8 has:
a. 16 dedicated inputs.
b. 8 special function pins.
c. 8 pins that are used as inputs or outputs.
d. all of the above
Q. Convert the following decimal number to 8-bit binary.
a. 101110112
b. 110111012
c. 101111012
d. 101111002