QUIZ -multiple choice

Choose the correct answers in the following questions:

 

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25.	The format used to present the logic output for the various combinations of logic inputs to a gate is called a(n):
	Truth Table.
	input logic function.
	Boolean constant.
	Boolean variable.
26.	The logic gate that will have HIGH or "1" at its output when any one of its inputs is HIGH is a(n):
	NOR gate
	OR gate
	AND gate
	NOT operation
27.	Which of the following equations would accurately describe a 4-input OR gate when A = 1, B = 1, C = 0 and D = 0?
	1 + 1 + 0 + 0 = 1
	1 + 1 + 0 + 0 = 01
	1 + 1 + 0 + 0 = 0
	1 + 1 + 0 + 0 = 00
28.	A NAND gate has:
	active low inputs and an active high output.
	active low inputs and an active low output.
	active high inputs and an active high output.
	active high inputs and an active low output.
29.	A small circle on the output of a logic gate is used to represent the:
	Comparator operation.
	OR operation.
	NOT operation.
	AND operation.
30.	Which timing diagram shown in figure is correct for an inverter?
	a
	b
	c
	d
31.	Which of the symbols shown in figure represents an AND gate?
	a
	b
	c
	d
32.	For a three-input AND gate, with the input waveforms as shown in figure , which output waveform is correct? ,
	a
	b
	c
	d
33.	Which of the symbols shown in figure represents an OR gate?
	a
	b
	c
	d
34.	For a three-input OR gate, with the input waveforms as shown in figure , which output waveform is correct?
	a
	b
	none
	d
35.	Which of the symbols shown in figure represents a NAND gate?
	a
	b
	c
	d
36.	For a 3-input NAND gate, with the input waveforms as shown in figure, which output waveform is correct?
	none
	b
	c
	d
37.	Which of the symbols shown in figure represents a NOR gate?
	a
	b
	c
	d
38.	For a three-input NOR gate, with the input waveforms as shown in figure, which output waveform is correct?
	a
	b
	c
	d
39.	Which of the examples below expresses the associative law of boolean algebra?
	A + (B + C) = (A + B) + C
	A + (B + C) = A + (B.C)
	A.(B.C) = (A..B) + C
	A.B.C = A + B + C
40.	Which of the examples below expresses the distributive law?
	(A + B) + C = A + (B + C)
	A.(B + C) = A.B + A.C
	A + (B + C) = A.B + A.C
	A.(B.C) = (A.B) + C
41.	Which of the following is based on DeMorgan's theorems?
42.	Which of the figures (a-d) is the DeMorgan equivalent of figure e (NAND gate)?
	a
	b
	c
	d
43.	Simplify the expression using DeMorgan's theorems.
	(A + B)C
44.	The Boolean equation for a NOR function is:
45.	A NOR gate with one HIGH input and one LOW input:
	will output a HIGH
	functions as an AND
	will not function
	will output a LOW
46.	Which logic gate does this truth table describe?
	AND
	OR
	NAND
	NOR
47.	Which step in this reduction process is using DeMorgan's theorem?
	STEP 1
	STEP 2
	STEP 3
	STEP 4
48.	An OR gate with inverted inputs functions as:
	an   AND.
	a NAND.
	a   NOR.
	a   NOT.
49.	Which of the figures below is equivalent to figure (e)?
	a
	b
	c
	d

 

50.	The implementation of simplified sum-of-products expressions may be easily implemented into actual logic circuits using all universal ________ gates with little or no increase in circuit complexity. (Select the response for the blank space that will BEST make the statement true.)
	AND/OR
	NAND
	NOR
	OR/AND
51.	Each "1" entry in a Karnaugh-map square represents:
	a HIGH for each input Truth Table condition that produces a HIGH output.
	a HIGH output on the Truth Table for all LOW input combinations.
	a LOW output for all possible HIGH input conditions.
	a DON'T CARE condition for all possible input Truth Table combinations.
52.	Which of the following statements accurately represents the two BEST methods of logic circuit simplification?
	Boolean algebra and Karnaugh mapping
	Karnaugh mapping and circuit waveform analysis
	Actual circuit trial and error evaluation and waveform analysis
	Boolean algebra and actual circuit trial and error evaluation
53.	Looping on a Karnaugh-map always results in the elimination of:
	variables within the loop that appear only in their complemented form.
	variables that remain unchanged within the loop.
	variables within the loop that appear in both complemented and uncomplemented form.
	variables within the loop that appear only in their uncomplemented form.
54.	Which of the following expressions represents  S=B?
	(A + B).(C + A)
	(A.B).(B.D)
	A.B+(C.B)
	A.B + B
55.	Which of the following expressions is in the sum-of-products form?
	(A + B).(C + D)
	(A.B).(C.D)
	A.B.(C.D)
	A.B + C.D
56.	Which of the following is an important feature of the sum-of-products form of expressions?
	All logic circuits are reduced to nothing more than simple AND and OR gates.
	The delay times are greatly reduced over other forms.
	No signal must pass through more than two gates, not including inverters.
	The maximum number of gates that any signal must pass through is reduced by a factor of two.
57.	Which of the following expressions is in the product-of-sums form?
	(A + B).(C + D)
	(A.B).(C.D)
	A.B.(C.D)
	A.B + C.D
58.	Solve the logic circuit in figure below :
	A + B.C + D
	((A + B).C) + D
	D.(A + B + C)
	(A.C + B.C).D
59.	Which of the following expressions is in the product-of-sums form?
	(A + B).(C + D)
	(A+.B).(C.D)
	A.B.(C+D)
	A.B + C.D
60.	For a two-input XNOR gate, with the input waveforms as shown in figure , which output waveform is correct?
	a
	none
	c
	d
61.	Which of the figures shown in figure represents the exclusive-NOR gate?
	a
	b
	c
	d
62.	Which statement below best describes a Karnaugh map?
	A Karnaugh map can be used to replace Boolean rules.
	The Karnaugh map eliminates the need for using NAND and NOR gates.
	Variable complements can be eliminated by using Karnaugh maps.
	Karnaugh maps provide a cookbook approach to simplifying Boolean expressions.
63.	Which of the Karnaugh-maps in figure represents the expression X = A.C + B?
	a
	b
	c
	d
64.	The simplest equation which implements the Karnaugh-map in figure is:
65.	Which of the following logic expressions represent the logic diagram shown?
66.	What type of logic circuit is represented by the figure shown in Question 65?
	XOR
	XNOR
	XAND
	XNAND
67.	Which of the following combinations cannot be combined into Karnaugh-map groups?
	Corners in the same row
	Corners in the same column
	Diagonal corners
	Overlapping combinations
68.   .Refer to figure below. What type of output arrangement is being used for the output? Complementary-symmetry Push-pull Quasi push-pull Totem-Pole   69.   What type of circuit is shown in figure below, and how is the output ordinarily connected? It is an open-collector gate and is used to drive loads that cannot be connected directly to Vcc due to high noise levels. It represents an active-LOW inverter and is used in negative logic systems. It is an open-collector gate. An external load must be connected between the output terminal and an appropriate supply voltage. Any of the above could be correct, depending on the specific application involved. How do you find this quiz? I need to study! Useful Cool!! A piece of cake!!