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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 logic circuit used to add two binary numbers






2. A digital counter having ten states






3. 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.






4. Data Communications equipment






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






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






7. A VHDL feature that can be used to predefine the logic function for multiple use throughout a program or programs






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






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






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






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. Describes a number system with a base of ten






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






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






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






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






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






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






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






20. 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.






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






22. The actual current in a branch






23. 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.






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






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






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






27. To connect 'end- to- end' as when several counters are connected from the terminal count output of one counter to the enable input of the next counter






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






29. 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






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






31. 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






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






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






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






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






37. 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






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






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






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






41. American National Standards Institute






42. A type of magnetic tape format






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






44. 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






45. 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.






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






47. 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






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. In Boolean algebra - the AND operation






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