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Digital Fundamentals

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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 device used to convert an analog signal to a sequence of digital codes






2. An asynchronous input used to reset a flip- flop (make the Q output 0); to place a register or counter in the state in which it contains all 0's






3. A type of semiconductor memory that stores data in the form of charge packets and is serially accessed






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






5. In addition (ORing) and multiplication (ANDing) of two variables the order in which the variables are ORed or ANDed makes no difference






6. A combination of input literals that cannot occur and can be used as a 1 or 0 on a Karnaugh Map for simplification

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7. In Boolean algebra - the AND operation






8. Data Terminal equipment






9. 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.






10. The maximum value of a voltage or current






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






12. American National Standards Institute






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






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






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






16. In addition - the number that is added to another number called the augend






17. The inverse of opposite of a number - in Boolean algebra - the inverse function - expressed with a bar over the variable. The complement of a 1 is a 0 - and vice versa






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






19. The basic timing signal in a digital system; a periodic waveform in which the interval between pulses equals the time for one bit; the triggering input of a flip- flop






20. An energy source that uses a chemical reaction to convert chemical energy into electrical energy.






21. An adverse condition that could occur if two or more devices try to communicate at the same time on a bus






22. A code within DOS that allows various operations on files and includes a primitive assembler; to eliminate a problem in hardware or software.






23. Digital Signal Processor; a special type of microprocessor that processes data in real time






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






25. 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.






26. In Boolean algebra - the OR operation






27. A logic circuit used to add two binary numbers






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






29. Characteristic of cells in a Karnaugh map in which there is a single- variable change from one cell to another cell next to it on any of its four sides






30. The current left after the total load current is subtracted from the total current into the circuit






31. A set of conductive paths hat connects the CPU to other parts of the computer to coordinate its operations and to communicate with external devices






32. A circuit (digital service) that switches digital data from one input line to several output lines in a specified time sequence






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






34. A filter that passes a range of frequencies lying between two critical freqencies and rejects frequencies above and below that range.






35. The unit of electrical current






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






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






38. One of the three regions in a bipolar junction transistor






39. Characterized by ten states or values






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






42. A type of inductor used to block or choke off high frequencies






43. The graph of a filter's frequency response showing the change in the output voltage to input voltage ratio expressed in dB as a function of frequency for a constant input voltage






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






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






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






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






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






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. Having two opposites charge carriers within the transistor structure







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