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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 unit of the cross - sectional area of a wire.






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






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






4. The portion within the microprocessor that provides the timing and control signals for getting data into and out of the microprocessor and for synchronizing the execution of instructions.






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






6. An electrical device consisting of two conductive plates separated by an insulating material and possessing the property of capacitance.






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

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






9. A type of inductor used to block or choke off high frequencies






10. 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






11. 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.






12. In addition - the number to which the addend is added






13. The beginning address of a segment of memory






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






15. 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






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






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






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






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






20. 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






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






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






23. 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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24. 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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25. A relatively small - high- speed memory that stores the most recently used instructions or data from the larger but slower main memory






26. 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






27. An electrical instrument used to measure current






28. 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






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






30. A code within DOS that allows various operations on files and includes a primitive assembler; to eliminate a problem in hardware or software.






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






32. A group of eight bits






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






34. The ability of a capacitor to store electrical charge.






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






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






37. Characterized by ten states or values






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






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






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






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






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






43. 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






44. 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.






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






46. 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.






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






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






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






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







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