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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. An electrical instrument used to measure current






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






3. An application program in development software packages that controls the design flow process and translates source code into object code in a format that can be logically tested or downloaded to a target device






4. Bipolar junction transistor; a semiconductor device used for switching or amplification. A BJT has two junctions - the base- emitter junction and the base- collector junction






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






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






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






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






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






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






11. 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






12. The maximum value of a voltage or current






13. A combined coder and decoder






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






15. A resettable protective device used for interrupting execessive current in an electric circuit






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






17. A two terminal circuit containing voltage sources - current sources - and resistors can be modeled as a voltage source in series with a resistor






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

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19. 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






20. The ability of a capacitor to store electrical charge.






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






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






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






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






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






26. 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






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






28. An instrument that can specify each of the other instruments on the bus as either a talker or a listener for the purpose of data transfer.






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






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






31. 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.






32. The normal level of a pulse waveform; the voltage level in the absence of a pulse.






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






34. The actual current in a branch






35. 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.






36. Burst extended data output dynamic random- access memory






37. A program that converts English- like mnemonics into machine code






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






39. A reduction of the output signal compared to the input signal - resulting in a ratio with a value of less than 1 for the output voltage to the input voltage of a circuit.






40. A type of magnetic tape format






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






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






43. Describes a number system with a base of ten






44. 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






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






46. A receiving device on a bus






47. A series of bits describing a final design that is sent to the target device during programming






48. 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






49. The application of a dc voltage to an electronic device to produce a desired mode of operation






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