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






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






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






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






5. A group of eight bits






6. 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






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






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






9. 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.






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






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






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






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






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






15. 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






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






17. 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.






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






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






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






21. 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






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






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






24. Dynamic random- access memory; a type of semiconductor memory that uses capacitors as the storage elements and is a volatile - read/write memory






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


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






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






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






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






30. A receiving device on a bus






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






32. A digital code in which each of the decimal digits - 0 through 9 - is represented by a group of four bits






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






34. Having two values or states; describes a number system that has a base of two and utilizes 1 and 0 as its digits






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






36. Data Communications equipment






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






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






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






40. Having two directions. the stored data can be shifted right or left






41. A combined coder and decoder






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






43. The unit of electrical current






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






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






46. 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






47. Burst extended data output dynamic random- access memory






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






49. A digital counter having ten states






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