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






2. A digital code in which each of the decimal digits - 0 through 9 - is represented by a group of four bits






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






4. The actual current in a branch






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






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






7. 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.






8. 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






9. The location of a given storage cell or group of cells in a memory; a unique memory location containing on byte






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






11. 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.






12. 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.






13. A receiving device on a bus






14. In Boolean algebra - the OR operation






15. 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.






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






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






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






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






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






21. Burst extended data output dynamic random- access memory






22. A logic circuit used to add two binary numbers






23. A resettable protective device used for interrupting execessive current in an electric circuit






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






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

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






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






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






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






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






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






32. A basic logic operation in which a true(high) output occurs only when all the input conditions are true (high)






33. 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






34. A set of conductive paths hat connects the CPU to other parts of the computer to coordinate its operations and to communicate with external devices






35. 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.






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






37. 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.






38. The interval of time occupied by a single bit in a sequence of bits; the period of the clock






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






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






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






42. Altera HDL; a nonstandard HDL






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






44. A group of eight bits






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






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






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






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






49. A notational system for logic symbols that specifies input and output relationships thus fully defining a given function






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