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






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






3. A combined coder and decoder






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






5. An arrangement of electrical and/or electronic components interconnected in such a way as to perform a specified function






6. 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






7. The number of protons in a nucleus






8. An instrument that can specify each of the other instruments on the bus as either a talker or a listener for the purpose of data transfer.






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






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






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






12. 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






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






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






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






16. A type of semiconductor memory having capacitive storage cells that lose stored data over a period of time and therefore must be refreshed.






17. A combination of input literals that cannot occur and can be used as a 1 or 0 on a Karnaugh Map for simplification

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






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






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






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






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






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






24. The inverse of opposite of a number - in Boolean algebra - the inverse function - expressed with a bar over the variable. The complement of a 1 is a 0 - and vice versa






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






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






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






28. An electrical device consisting of two conductive plates separated by an insulating material and possessing the property of capacitance.






29. A unit of the cross - sectional area of a wire.






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






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






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






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






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






35. The maximum value of a voltage or current






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






37. 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.






38. 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






39. Data Terminal equipment






40. Dual in - line memory module






41. 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






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






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






44. 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






45. 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






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






47. The process that prevents two sources from using a bus at the same time






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






49. Voltage Divider Rule in determining TEC Thevenin Equivalence Circuit






50. Altera HDL; a nonstandard HDL