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Digital Fundamentals

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. A resettable protective device used for interrupting execessive current in an electric circuit






2. Sum of all the voltage drops in series equals to the source voltage

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3. A bidirectional set of conductive paths on which data or instruction codes are transferred into a microprocessor or on which the result of an operation is sent out from the microprocessor






4. A type of PLD nonvolatile programmable link that can be left open or can be shorted once as directed by the program






5. The phasor combination of resistive power (true power) and reactive power. The unit is the volt- amperes (VA).






6. A device used to convert an analog signal to a sequence of digital codes






7. The process of rippling an input carry to become the output carry in a full- adder when either or both of the input bits are 1's and the input carry is a 1






8. A type of counter in which each stage is clocked from the output of the preceding stage.






9. The process that prevents two sources from using a bus at the same time






10. The actual current in a branch






11. The average of a sine wave over one half- cycle. It is 0.637 times the peak value.






12. To decrease the binary state of a counter by one






13. The law that states ORing several variables and then ANDing the single variable with each of the several variables and the ORing the product






14. The action of a circuit in which it accepts current into its output from a load






15. The beginning address of a segment of memory






16. In relation to VHDL feature that permits operations to be processed in a parallel;that is operations that occur simultaneously






17. A digital circuit device that converts coded information into another (familiar) or noncoded form






18. A class of integrated logic circuits that is implemented with a type of field effect transistor






19. The number of protons in a nucleus






20. The unit of electrical current






21. A circuit that selects data from several inputs one at a time in a sequence and places them on the output; also called a multiplexer.






22. A logic gate that produces a High output only when all of the inputs are HIGH






23. The portion of the CPU that interfaces with the system buses and fetches instructions - reads operands - and writes results.






24. A stage of the DSP pipeline operation in which instructions are assigned to functional units and are decoded.






25. American wire gauge; a standardization based on wire diameter






26. Having two stable states. Flip- flops and latches are bistable multivibrators.






27. Sum of all currents entering a node is equal to the sum of all currents leaving the same node

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28. The portion within the microprocessor that provides the timing and control signals for getting data into and out of the microprocessor and for synchronizing the execution of instructions.






29. A type of bistable multivibrator in which the output assumes the state of the D input on the triggering edge of a clock pulse.






30. Describes a number system with a base of ten






31. A binary digit - which can be either 1 or 0






32. American Standard Code for Information Interchange; the most widely used alphanumeric code.






33. The range of frequencies for which the current (or output voltage) is equal to or greater than 70.7% of its value at the resonant frequency that is considered to be passed by a filter.






34. Having no stable state. An astable multivibrator oscillates between two quasi- stable states.






35. A notational system for logic symbols that specifies input and output relationships thus fully defining a given function






36. To connect 'end- to- end' as when several counters are connected from the terminal count output of one counter to the enable input of the next counter






37. Transistor-Transistor Logic and is implemented with bipolar junction transistors






38. In Boolean algebra - the AND operation






39. In a division operation the quantity that is being divided






40. A combination of logic gates interconnected to produce a specified Boolean function with no storage or memory capability; sometimes called combinatorial logic






41. A relatively small - high- speed memory that stores the most recently used instructions or data from the larger but slower main memory






42. One of the three regions in a bipolar Junction transistor(North junction of NpN)






43. A semiconductor device that conducts current in only one direction






44. A complex programmable logic device that consists basically of muliple SPLD arrays with programmable interconnections.






45. The time from the application of a valid memory address to the appearance of valid output data






46. Consisting of numerals - letters - and other characters






47. A combined coder and decoder






48. The effect created when a signal is sampled at less than twice the signal frequency. Aliasing creates unwanted frequencies that interfere with the signal frequency.






49. A method for the automated testing of printed circuit boards in which the board is mounted on a fixture that resembles a bed of nails that makes contact with test points






50. A digital circuit that compares the magnitudes of two quantiities and produces an output indicating the relationship of the quantities







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