26. True or False? A precise way of expressing a logic function is by use of a truth table.
27. True or False? Bipolar and MOS are two types semiconductor technologies.
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COMP 202
End of Semester II Exam, Page 4 of 6
10* May 2019
28. True or False? One transistor is enough to implement a NOT gate.
29. True or False? Sequential circuits contain memory and combinational circuits do not.
30. True or False? The outputs of a sequential circuit are computed using both the present and past input values.
31. True or False? A sequential circuit is a digital circuit whose logic states depend on a specified time sequence.
32. True or False? Sequential circuits contain only combinational logics.
33. True or False? Logie gates are built using vacuum tubes.
34. True or False? In an incompletely specified Boolean function "don't cares" mean work in progress in the design.
35. True or False? From DeMorgan's Laws we can easily find the complement or inverse of any Boolean expression.
36. True or False? In general, a multiplexer with n control inputs can be used to select any one of
2n data inputs.
37. True or False? An example use of multiplexers is as a CPU's program counter.
38. True or False? In general, a decoder has n inputs and 2" outputs.
39. True or False? Decoders find many uses in digital circuits an example of which is building read only memories (ROMs).
40. True or False? Once binary data is stored in the ROM, it can be read out whenever desired, but the data that is stored cannot be changed under normal operating conditions.