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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. 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.






2. 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.






3. 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






4. 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.






5. 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






6. A theorem that states that any amount of voltage sources and current sources can be combined into a single current source with a parallel resistor.


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






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






9. A group of eight bits






10. An energy source that uses a chemical reaction to convert chemical energy into electrical energy.






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






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






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






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






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






16. Altera HDL; a nonstandard HDL






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






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






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






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






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






22. Characterized by ten states or values






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






24. The action of a circuit in which it accepts current into its output from a load






25. A one- way group of conductors from the to a memory - or other external device - on which the address code is sent






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






27. In Boolean algebra - the OR operation






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






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






30. A transformer in which the primary and secondary are in a single winding






31. The ability of a capacitor to store electrical charge.






32. 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.






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






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






35. The beginning address of a segment of memory






36. A logic circuit used to add two binary numbers






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






38. An electrical instrument used to measure current






39. Burst extended data output dynamic random- access memory






40. A relatively small - high- speed memory that stores the most recently used instructions or data from the larger but slower main memory






41. 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






42. A receiving device on a bus






43. Describes a number system with a base of ten






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






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






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






47. A two terminal circuit containing voltage sources - current sources - and resistors can be modeled as a voltage source in series with a resistor






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






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






50. The range of frequencies for which the current (or output voltage) is equal to or greater than 70.7% of its value at the resonant frequency that is considered to be passed by a filter.