Test your basic knowledge |

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






2. 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






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






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






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






6. 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






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






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






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






10. 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.


11. 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






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






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






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






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






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






17. American wire gauge; a standardization based on wire diameter






18. 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






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






20. 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






21. Dual in - line memory module






22. 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.






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






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






25. An electrical instrument used to measure current






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






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






28. 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.






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






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






31. An expression of variables and operators used to express the operation of a logic circuit






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






33. Data Terminal equipment






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






35. 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






36. American National Standards Institute






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






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






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






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






41. Having two opposites charge carriers within the transistor structure






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






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






44. 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.






45. 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.






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






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






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






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






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