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






2. A combined coder and decoder






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






5. 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






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






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






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






9. The time from the application of a valid memory address to the appearance of valid output data






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






11. Burst extended data output dynamic random- access memory






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






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






14. 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.






15. A complex programmable logic device that consists basically of muliple SPLD arrays with programmable interconnections.






16. 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






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






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






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






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






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






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






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






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






25. 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.


26. The smallest particle of an element possessing the unique characteristics of that element.






27. Consisting of numerals - letters - and other characters






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






29. 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.






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






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






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






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






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






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






36. A logic circuit used to add two binary numbers






37. The inverse of opposite of a number - in Boolean algebra - the inverse function - expressed with a bar over the variable. The complement of a 1 is a 0 - and vice versa






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






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






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






41. A receiving device on a bus






42. 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






43. A nominally continuous electrical signal that varies in amplitude or frequency in response to changes in sound - light - heat - position - or pressure.






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






45. A circuit with a complete current path






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






47. 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.






48. 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






49. A combination of input literals that cannot occur and can be used as a 1 or 0 on a Karnaugh Map for simplification


50. In Boolean algebra - the AND operation