Test your basic knowledge |

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. The process of converting an analog signal to digital form






2. A one- way group of conductors from the to a memory - or other external device - on which the address code is sent






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






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






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






6. A logic circuit used to add two binary numbers






7. 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.






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






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






10. Characterized by ten states or values






11. 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






12. In Boolean algebra - the AND operation






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






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






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






16. One current path in a parallel circuit; a current path that connects two nodes






17. A transformer in which the primary and secondary are in a single winding






18. A connection at the midpoint of a winding in a transformer






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






20. 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






21. The total number of data units(bits - nibbles - bytes - words) that a memory can store.






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






23. A measure of the ability of a reactive circuit to permit current; the reciprocal of impedance. the unit is the siemens






24. 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.






25. Data Communications equipment






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






27. In addition - the number to which the addend is added






28. 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






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






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






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






32. A method for internally testing a PLD based on the JTAG standard (IEEE std.)






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






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






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






36. An electrical instrument used to measure current






37. Stands for Complementary Metal-Oxide Semiconductor and is implemented with a type of field transistor






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






39. The actual current in a branch






40. A combined coder and decoder






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


42. The ratio of pulse width to period expressed as a percentage






43. A method of analog- to- digital conversion using a 1- bit quantization process






44. The opposition of a capacitor to permit current; the reciprocal of capacitive reactance. The unit is the siemens.






45. 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.






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






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






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






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






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