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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. 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.






2. Having two opposites charge carriers within the transistor structure






3. One of the three regions in a bipolar Junction transistor(North junction of NpN)






4. 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.






5. 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






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






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






8. Information in numeric - alphabetic - or other form.






9. A type of magnetic tape format






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






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






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






13. A receiving device on a bus






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






15. A group of eight bits






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






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






18. A class of integrated logic circuits that is implemented with a type of field effect transistor






19. 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






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






21. A circuit with a complete current path






22. The beginning address of a segment of memory






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






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






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






26. A number given in ampere- hours determined by multiplying the current times the length of the time (h) a battery can deliver that current to a load






27. In Boolean algebra - the AND operation






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






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






30. 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.






31. 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






32. A document that specifies parameter values and operating conditions for an integrated circuits or other device






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






34. A programming language that uses English like words and has a one- to- one correspondence to machine language






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

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






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






38. The process of producing an output carry in full- adder when both input bits are 1s.






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






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






41. The VHDL unit that describes the internal operation of a logic function; the internal functional arrangement of the elements that give a device its particular operating characteristics.






42. Burst extended data output dynamic random- access memory






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






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






45. A circuit that prevents loading of an input or output






46. 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.






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






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






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






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