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






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






3. A type of semiconductor memory having capacitive storage cells that lose stored data over a period of time and therefore must be refreshed.






4. The VHDL unit that describes the internal operation of a logic function; the internal functional arrangement of the elements that give a device its particular operating characteristics.






5. The actual current in a branch






6. A condition where all the load currents are equal and the neutral current is zero






7. A group of eight bits






8. An electrical device consisting of two conductive plates separated by an insulating material and possessing the property of capacitance.






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






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






11. A number given in ampere- hours determined by multiplying the current times the length of the time (h) a battery can deliver that current to a load






12. An expression of variables and operators used to express the operation of a logic circuit






13. Arithmetic Logic Unit; the key processing element of a microprocessor that perfoms arithmetic and logic operations.






14. 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.






15. Data Terminal equipment






16. 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.






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






18. The process of producing an output carry in full- adder when both input bits are 1s.






19. In a pulse waveform - the height or maximum value of the pulse as measured from its low level.






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






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






22. The process or sequence of operations carried out to program a target device






23. Consisting of numerals - letters - and other characters






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






25. The process of converting an analog signal to digital form






26. Digital audio tape; a type of magnetic tape format






27. Basic input/output system; a set of programs in ROM that interfaces the I/) devices in a computer system






28. 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.






29. A interconnection of electrical components designed to produce a desired result. A basic circuits consists of a source - a load and an interconnecting current path.






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






31. Describes a number system with a base of ten






32. A combined coder and decoder






33. A set of interconnections that interface one or more devices based on a standardized specification






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






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






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






37. In a PLD - a matrix formed by rows of product- term lines columns of input lines with a programmable cell at each junctions. In VHDL - an array is an ordered set of individual items called elements with a single identifier name.






38. The interval of time occupied by a single bit in a sequence of bits; the period of the clock






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






40. The smallest particle of an element possessing the unique characteristics of that element.






41. The rotational rate of a phasor which is related to the frequency of the sine wave that the phasor represents






42. An array of AND gates consisting of a matrix of programmable interconnection






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






44. Direct memory access; a method to directly interface a peripheral device to memory without using the CPU for control






45. A circuit that prevents loading of an input or output






46. 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






47. A nominally continuous electrical signal that varies in amplitude or frequency in response to changes in sound - light - heat - position - or pressure.






48. A theorem that states that any amount of voltage sources and current sources can be combined into a single current source with a parallel resistor.

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49. The digit generated when the sum of two binary digits exceeds 1






50. The main part of a computer responsible for control and processing of data; the core of a DSP that processes the program instructions