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Digital Fundamentals

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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 normal level of a pulse waveform; the voltage level in the absence of a pulse.






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






3. 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.






4. A group of eight bits






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






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






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






8. Sum of all currents entering a node is equal to the sum of all currents leaving the same node

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9. The actual current in a branch






10. 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






11. 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






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






13. 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






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






15. 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.






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






17. Dynamic random- access memory; a type of semiconductor memory that uses capacitors as the storage elements and is a volatile - read/write memory






18. 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






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






20. 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.






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






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






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






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






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






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






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






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






29. 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.






30. The number of protons in a nucleus






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






32. A combined coder and decoder






33. A stage of the DSP pipeline operation in which instructions are assigned to functional units and are decoded.






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






35. 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.






36. American National Standards Institute






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






38. A digital counter having ten states






39. In addition (Oring) and multiplication (ANDing) of three or more variables - the order in which the variables are grouped makes no difference






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

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41. A document that specifies parameter values and operating conditions for an integrated circuits or other device






42. An asynchronous input used to reset a flip- flop (make the Q output 0); to place a register or counter in the state in which it contains all 0's






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






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






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






46. Transistor-Transistor Logic and is implemented with bipolar junction transistors






47. A programming language that uses English like words and has a one- to- one correspondence to machine language






48. 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






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






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







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