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






2. 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.






3. To decrease the binary state of a counter by one






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

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5. Data Communications equipment






6. The digit generated when the sum of two binary digits exceeds 1






7. A bridge circuit that is in the balanced state as indicated by 0 V across the output.






8. The beginning address of a segment of memory






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






10. Data Terminal equipment






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






12. Having two directions. the stored data can be shifted right or left






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






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






15. 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.






16. A software compiler language for SPLD programming; a type of hardware description language (HDL)






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






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






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






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






21. 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






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






23. 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






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






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






26. A digital circuit capable of counting electronic events - such as pulses - by progressing through a sequence of binary states.






27. A combined coder and decoder






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






29. Consisting of numerals - letters - and other characters






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






31. A number given in ampere- hours determined by multiplying the current times the length of the time (h) a battery can deliver that current to a load






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






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






34. The process or sequence of operations carried out to program a target device






35. The main part of a computer responsible for control and processing of data; the core of a DSP that processes the program instructions






36. A type of magnetic tape format






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






38. A receiving device on a bus






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






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






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






42. The normal level of a pulse waveform; the voltage level in the absence of a pulse.






43. A circuit with a complete current path






44. The number of protons in a nucleus






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






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






47. A circuit that selects data from several inputs one at a time in a sequence and places them on the output; also called a multiplexer.






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






49. Having two opposites charge carriers within the transistor structure






50. 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