Gibilisco - Digital Basics

20 Questions | Attempts: 173
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• 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.
• 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.

• B.

• C.

• D.

• 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.

• 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