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






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






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






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






5. 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






6. Data Terminal equipment






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






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






9. 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






10. 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.






11. The mathematics of logic circuits






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






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






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






15. A program that translates an assembly language program for one type of microprocessor to an assembly language for another type of microprocessor






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






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

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18. 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






19. The actual current in a branch






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






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






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






23. Characterized by ten states or values






24. A notational system for logic symbols that specifies input and output relationships thus fully defining a given function






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






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






27. Having two opposites charge carriers within the transistor structure






28. 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.






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






30. 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






31. Characteristic of cells in a Karnaugh map in which there is a single- variable change from one cell to another cell next to it on any of its four sides






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






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






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






35. An application program in development software packages that controls the design flow process and translates source code into object code in a format that can be logically tested or downloaded to a target device






36. 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.






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






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






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






40. In addition (Oring) and multiplication (ANDing) of three or more variables - the order in which the variables are grouped makes no difference






41. 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






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






43. A digital counter having ten states






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






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






46. 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






47. 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.






48. A circuit with a complete current path






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






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