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






2. The smallest particle of an element possessing the unique characteristics of that element.






3. An electrical instrument used to measure current






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






5. The opposition of a capacitor to permit current; the reciprocal of capacitive reactance. The unit is the siemens.






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






7. The actual current in a branch






8. 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.

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






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






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






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






13. 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






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






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






16. A class of integrated logic circuits that is implemented with a type of field effect transistor






17. The unit of electrical current






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






19. A receiving device on a bus






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






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






22. 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






23. In Boolean algebra - the AND operation






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






25. 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






26. A digital counter having ten states






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






28. Dual in - line memory module






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






30. 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.






31. The current left after the total load current is subtracted from the total current into the circuit






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






33. 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






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






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






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






37. The ratio of pulse width to period expressed as a percentage






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






39. In addition - the number that is added to another number called the augend






40. Describes a number system with a base of ten






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






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






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






44. Sum of all the voltage drops in series equals to the source voltage

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






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






47. 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






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






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






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