Gibilisco - Digital Basics
- 1.Suppose inverters are placed in series with both inputs of an AND gate. Under whatconditions is the output of the resulting black box high?
- A.
If and only if both inverter inputs are high
- B.
If and only if both inverter inputs are low
- C.
If and only if one inverter input is high and the other is low
- D.
Under no conditions (the output is always low)
- 2.Suppose an AND gate is followed by an inverter. Under what conditions is the output of theresulting black box low?
- A.
If and only if both inputs are high
- B.
If and only if both inputs are low
- C.
If and only if one input is high and the other is low
- D.
Under no conditions (the output is always high)
- 3.What is the binary equivalent of decimal 29?
- A.
10101
- B.
11101
- C.
10111
- D.
11011
- 4.In Boolean algebra, addition represents
- A.
The logical NOT operation.
- B.
The logical AND operation.
- C.
The logical OR operation.
- D.
The logical NAND operation.
- 5.If the output to a logical inverter is low, it means that
- A.
Both of the two inputs are high.
- B.
Both of the two inputs are low.
- C.
The single input is high.
- D.
The single input is low.
- 6.What is the decimal equivalent of binary 1111?
- A.
15
- B.
31
- C.
63
- D.
127
- 7.The output of an AND gate is high if and only if
- A.
One input is high and the others are low.
- B.
One input is low and the others are high.
- C.
Any of the inputs is low.
- D.
All inputs are high.
- 8.DeMorgan’s Theorem states that, for all logical statements X and Y,
- A.
−(X*Y) is equivalent to X+Y.
- B.
X*Y is equivalent to −(X+Y).
- C.
(−X)+(−Y) is equivalent to X*Y.
- D.
(−X)+(−Y) is equivalent to −(X*Y).
- 9.If you see a number represented by FF in the documentation for an electronic circuit orsystem, you can be certain that the number is
- A.
Radix 16.
- B.
Radix 10.
- C.
Radix 8.
- D.
Radix 2.
- 10.Which of the following codes is digital?
- A.
Morse
- B.
Baudot
- C.
ASCII
- D.
All of the above
- 11.Which of the following voltages could normally represent a 1 in positive logic?
- A.
0.0 V
- B.
+0.5 V
- C.
+5 V
- D.
+50 V
- 12.Which of the following voltages might normally represent a 1 in negative logic?
- A.
0.0 V
- B.
+12 V
- C.
+5 V
- D.
+50 V
- 13.Fill in the blank to make the following sentence true: “ data transmission refers to digitalbits sent along a single line, one bit after another.”
- A.
Serial
- B.
Synchronous
- C.
Parallel
- D.
Analog
- 14.The inputs of an R-S flip-flop are known as
- A.
Low and high.
- B.
Octal and binary.
- C.
Synchronous and asynchronous.
- D.
Reset and set.
- 15.When both inputs of an R-S flip-flop are 0,
- A.
The outputs stay as they are.
- B.
Q = 0 and −Q = 1.
- C.
Q = 1 and −Q = 0.
- D.
The resulting outputs can be absurd.
- 16.The fifth digit from the right in a binary number carries which decimal value?
- A.
64
- B.
32
- C.
24
- D.
16
- 17.What is the octal equivalent of binary 1010?
- A.
4
- B.
10
- C.
12
- D.
There is no way to tell without more information.
- 18.What is the largest possible radix 10 number that can be represented as a six-digit binarynumber?
- A.
Decimal 256
- B.
Decimal 128
- C.
Decimal 64
- D.
Decimal 63
- 19.If one of the inputs to a two-input NOR gate is high, what is the output state?
- A.
There is not enough information to tell.
- B.
Low
- C.
High
- D.
It depends on the state of the other input.
- 20.Suppose a logic circuit has four inputs W, X, Y, and Z. How many possible inputcombinations are there?
- A.
4
- B.
8
- C.
16
- D.
32
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