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Digital Fundamentals

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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 complex programmable logic device that consists basically of muliple SPLD arrays with programmable interconnections.






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






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






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 combined coder and decoder






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






7. 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






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






9. 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.






10. A circuit with a complete current path






11. Consisting of numerals - letters - and other characters






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






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






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






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






16. 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.






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






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






19. 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






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






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






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






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






24. 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






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






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






27. Having two stable states. Flip- flops and latches are bistable multivibrators.






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






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






30. 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.






31. The maximum value of a voltage or current






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






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






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






35. A combination of logic gates interconnected to produce a specified Boolean function with no storage or memory capability; sometimes called combinatorial logic






36. In a division operation the quantity that is being divided






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






38. 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






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






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






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






42. Digital Signal Processor; a special type of microprocessor that processes data in real time






43. An electrical instrument used to measure current






44. Data Communications equipment






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

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






47. Burst extended data output dynamic random- access memory






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






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






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