## Test your basic knowledge |

# Digital Fundamentals

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

**2. To decrease the binary state of a counter by one**

**3. 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.**

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

**5. American Standard Code for Information Interchange; the most widely used alphanumeric code.**

**6. A combined coder and decoder**

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

**8. A combination of logic gates interconnected to produce a specified Boolean function with no storage or memory capability; sometimes called combinatorial logic**

**9. In a pulse waveform - the height or maximum value of the pulse as measured from its low level.**

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

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

**12. American wire gauge; a standardization based on wire diameter**

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

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

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

**16. 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**

**17. A unit of the cross - sectional area of a wire.**

**18. Stands for Complementary Metal-Oxide Semiconductor and is implemented with a type of field transistor**

**19. Characterized by ten states or values**

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

**21. The mathematics of logic circuits**

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

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

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

**25. In a division operation the quantity that is being divided**

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

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

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

**29. Describes a number system with a base of ten**

**30. Altera HDL; a nonstandard HDL**

**31. A set of interconnections that interface one or more devices based on a standardized specification**

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

**33. A circuit that prevents loading of an input or output**

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

**35. A device used to convert an analog signal to a sequence of digital codes**

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

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

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

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

**40. The unit of electrical current**

**41. 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.**

**42. A circuit (digital service) that switches digital data from one input line to several output lines in a specified time sequence**

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

**44. The process of converting an analog signal to digital form**

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

**46. A receiving device on a bus**

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

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

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

**50. 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.**