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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. 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






2. A basic logic operation in which a true(high) output occurs only when all the input conditions are true (high)






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






4. The location of a given storage cell or group of cells in a memory; a unique memory location containing on byte






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






6. A bridge circuit that is in the balanced state as indicated by 0 V across the output.






7. A type of IC package whose leads must pass through holes to the other side of a PC board






8. 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






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






10. The maximum value of a voltage or current






11. A electrical property of matter that exist because of an excess or a deficiency of electrons. Can be either positive or negative






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






13. The number of protons in a nucleus






14. A VHDL feature that can be used to predefine the logic function for multiple use throughout a program or programs






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






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






17. 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






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






19. A software compiler language for SPLD programming; a type of hardware description language (HDL)






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






21. 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






22. The unit of electrical current






23. 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






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






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






26. In Boolean algebra - the AND operation






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






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






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






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






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






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






33. A digital circuit capable of counting electronic events - such as pulses - by progressing through a sequence of binary states.






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






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






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






37. Altera HDL; a nonstandard HDL






38. 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.






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


40. 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.






41. American National Standards Institute






42. Data Terminal equipment






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






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






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






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


47. 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.






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






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






50. A unit of logic in an FPGA that is made up of multiple smaller logic modules and a local programmable interconnect that is used to connect logic modules within the CLB






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