Q1: MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A 1-of-8 octal decoder has eight outputs and decodes an input of ________ bits. A) three B) four C) one
D) two
2) A multiplexer is a device which A) selects one of several inputs to be placed onto one output line. B) converts some code into a recognizable number or character. C) routes a single data input onto one of several data outputs. D) generates an encoded output from a numeric input. 3) A multiplexer is also known as a(n) A) data selector. B) code converter.
C) encoder.
4) Which device is an application of sum-of-products (SOP) logic? A) multiplexer B) demultiplexer C) comparator
D) decoder.
D) counter
5) Which logic gate is described by the following truth table?
A 0 0 1 1
B 0 1 0 1
X 0 1 1 1
A) OR
B) inverter
C) AND
D) cannot tell
C) AND
D) NOR
6) Which logic gate is described by the following truth table?
A 0 0 1 1
B 0 1 0 1
X 1 1 1 0
A) NAND
B) OR
1
7) Waveforms A and B represent the inputs to an AND gate. During which time interval will the output from the gate (X) be HIGH?
A) time interval 2
B) time interval 1
C) time interval 4
D) time interval 5
C) X = A + B
D) X = A + B
8) The Boolean equation for a NOR function is ________. A) X = A + B
B) X = A + B
9) During which time interval(s) will output X of this XOR timing diagram be HIGH?
A) time intervals 1, 4, and 5 C) time intervals 2 and 4
B) time intervals 1, 3, and 5 D) time interval 3
10) The Boolean equation for the exclusive-NOR function is A) X = AB + A B.
B) X = A + B + A + B.
C) X = A + B.
11) During which time interval(s) will output X of this XNOR timing diagram be LOW?
A) time interval 3 C) time intervals 1 and 5
B) time interval 1 D) time intervals 1, 2, 4, 5
2
D) X = AB + AB.