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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. Data Terminal equipment






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






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






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






5. The number of protons in a nucleus






6. A type of bistable multivibrator in which the output assumes the state of the D input on the triggering edge of a clock pulse.






7. A combined coder and decoder






8. 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.






9. An electrical instrument used to measure current






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






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






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






13. In Boolean algebra - the AND operation






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






15. A digital circuit device that converts coded information into another (familiar) or noncoded form






16. A digital counter having ten states






17. 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.






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






19. The mathematics of logic circuits






20. 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.






21. 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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22. 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.






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

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24. The graph of a filter's frequency response showing the change in the output voltage to input voltage ratio expressed in dB as a function of frequency for a constant input voltage






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






26. Describes a number system with a base of ten






27. The unit of electrical current






28. A relatively small - high- speed memory that stores the most recently used instructions or data from the larger but slower main memory






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






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






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






32. The maximum value of a voltage or current






33. American National Standards Institute






34. 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.






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






36. 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.






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






38. A circuit that prevents loading of an input or output






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






40. Digital Signal Processor; a special type of microprocessor that processes data in real time






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






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






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






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






46. The beginning address of a segment of memory






47. 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






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






49. One of the three regions in a bipolar junction transistor






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