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Digital Electronics last review

Total questions: 100

Worksheet time: 3hrs 23mins

Name
Class
Date
1.

What are the symbols used to represent digits in the binary number system?

a)

0,1

b)

0 through 8

c)

0,1,2

d)

1,2

2.

The circuit schematic image above represents an:

a)

Resistor

b)

LED

c)

Transistor

d)

Diode

3.
Write in standard form: 
8 x 104
a)
8,000
b)
80,000
c)
.00008
4.
Which number is correctly written in scientific notation?
a)
5.67 x 105
b)
56.7 x 103
c)
0.567 x 106
5.
How would you write 4.3756 x 104 in standard form?
a)
437,560,000
b)
0.00043756
c)
43,756
d)
4,3756
6.

A transistor is most closely related to which of the following

a)

Resistor

b)

ransistor

c)

switch

d)

current

7.

I / Current is the speed/direction of electric flow measured in which of the following?

a)

Watts

b)

Volts

c)

Amps

d)

Ohms

8.

A carbon resistor's level is measured in which of the following units?

a)

Resistance

b)

Ohms

c)

greek omega

d)

voltage

9.

The symbol above best represents which of the following?

a)

Voltage

b)

Power

c)

Ground

d)

LED

10.

The breadboard above has electrical connections in series of:

a)

5

b)

4

c)

20

d)

all are connected

11.
Convert 128 to binary
a)
10000000
b)
01111110
c)
10000001
d)
11001100
12.
Convert 00010001 to decimal
a)
17
b)
27
c)
37
d)
47
13.

The water tank in the water - electricity analogy is best compared to which of the following?

a)

volts

b)

current

c)

amps

d)

resistance

14.

Express 0.021 amps in SI notation

a)

21 A

b)

21 mA

c)

2.1 mA

d)

21 kA

15.

Express 4782000 Ohms in SI notation

a)

4.782 MΩM\Omega

b)

4.782 mΩm\Omega

c)

4782 kΩk\Omega

d)

4782 Ω\Omega

16.
What is the output of an OR gate if the inputs are 1 and 0?
a)
0
b)
1
c)
OFF
d)
2
17.
What is the output of an AND gate if the inputs are 1 and 0?
a)
ON
b)
2
c)
1
d)
0
18.
A NOT gate has…
a)
Two inputs and one output
b)
One input and one output
c)
One input and two outputs
d)
Two inputs and two outputs
19.
An OR gate has
a)
Two inputs and one output
b)
One input and one output
c)
One input and two outputs
d)
Two inputs and two outputs
20.
A logic state can only be….
a)
On or 1
b)
Off or 1
c)
1 or 0
d)
In and Out
21.
The output of a ________ gate is only 1 when both inputs are 1.
a)
OR
b)
NOT
c)
NAND
d)
AND
22.
What logic gate is this?
a)
AND
b)
OR 
c)
NOT
d)
TO
23.
What gate is this table for?
a)
AND
b)
OR
c)
NOT
d)
NOR
24.

Which logic gate is this?

a)

AND

b)

OR

c)

XOR

d)

NOT

25.

What will the circuit's output be?

a)

1

b)

0

26.
What kind of gate is this?
a)
NOR
b)
NAND
c)
OR
d)
XOR
27.
The output of an AND gate is LOW ________.
a)
all the time
b)
when any input is HIGH
c)
when all inputs are HIGH
d)
when any input is LOW
28.

Which Logic gate does this Truth Table represent?

a)

AND Gate

b)

OR Gate

c)

NOT Gate

d)

NAND Gate

29.

Which logic gate is shown?

a)

NOR Gate

b)

XOR Gate

c)

XNor Gate

d)

AND Gate

e)

NAND gate

30.

Which logic gate is shown?

a)

AND gate

b)

OR gate

c)

NOT gate

d)

NOR gate

31.

What gate is represented by the truth table shown?

a)

NOR gate

b)

NOT gate

c)

AND gate

d)

XOR gate

32.
A logic state can only be….
a)
On or 1
b)
Off or 1
c)
1 or 0
d)
In and Out
33.

Convert the binary number 01011 into decimal

a)

10

b)

11

c)

13

d)

12

34.

The NOR Gate is OR Gate followed by ...............

a)

OR Gate

b)

NOT Gate

c)

AND Gate

d)

None of the above

35.

What is the meaning of 0 in a Digital signal?

a)

Max possible value

b)

No current/voltage

c)

A light On

d)

A light Off

36.

If both inputs have to be TRUE, which truth table represents that logical relationship?

a)
b)
c)
d)
37.

If both inputs have to be FALSE, which truth table represents that logical relationship?

a)
b)
c)
d)
38.

Which logic gate outputs TRUE if one, but NOT BOTH inputs is true?

a)
b)
c)
d)
39.

When an input to a logic chip has no connection to positive or negative, the logic gate will freak out. These switches are an example of that because they are missing....

a)

Floaters

b)

Pull Down Resistors

c)

LEDs

d)

Pull Up Resistors

40.

When an input to a logic chip has no connection to positive or negative, the logic gate will freak out. That condition, not being connected is called:

a)

Pulling Down

b)

Drifting

c)

Floating

d)

Lifting

41.

Logic gate circuits require lots of positive and negative connections. The thing they connect to is called a...

a)

Breaker

b)

Shuttle

c)

Bus

d)

Array

42.

The left side is connected to

a)

5V Positive

b)

The "ground" negative

c)

An electric Jelly fish

d)

A ray

43.

Which situation would make the most sense to use an AND gate?

a)

Sound the alarm if smoke it detected. Sound the alarm if the manual lever is pulled. Sound the alarm if both happen.

b)

The missile should launch when both buttons are pushed.

c)

The night light should turn on when the regular lights are OFF (no light detected).

d)

Do not turn on the sprinklers it rained today or there is a football game today.

44.

Which situation would make the most sense to use an NOR gate?

a)

Sound the alarm if smoke it detected. Sound the alarm if the manual lever is pulled. Sound the alarm if both happen.

b)

The missile should launch when both buttons are pushed.

c)

The night light should turn on when the regular lights are OFF (no light detected).

d)

Do not turn on the sprinklers it rained today or there is a football game today.

45.

Which situation would make the most sense to use an NOT gate?

a)

Sound the alarm if smoke it detected. Sound the alarm if the manual lever is pulled. Sound the alarm if both happen.

b)

The missile should launch when both buttons are pushed.

c)

The night light should turn on when the regular lights are OFF (no light detected).

d)

Do not turn on the sprinklers it rained today or there is a football game today.

46.

Which situation would make the most sense to use an ORgate?

a)

Sound the alarm if smoke it detected. Sound the alarm if the manual lever is pulled. Sound the alarm if both happen.

b)

The missile should launch when both buttons are pushed.

c)

The night light should turn on when the regular lights are OFF (no light detected).

d)

Do not turn on the sprinklers it rained today or there is a football game today.

47.

When lots of elements are built into a single circuit, it is called a chip, or a(n)

a)

transistor.

b)

integrated circuit.

c)

drive.

d)

input.

48.

If I turn on one switch, and turn the other off, which gate would output TRUE?

a)

AND

b)

NOR

c)

XNOR

d)

OR

49.

If I turn on one switch, and turn the other on, which gate would output FALSE?

a)

AND

b)

NAND

c)

XNOR

d)

OR

50.

If I turn off one switch, and turn the other off, which gate would output TRUE?

a)

AND

b)

NOR

c)

XOR

d)

OR

51.

The circle at the end of some gates means NOT. How does adding the the word NOT change the outputs?

a)

It changes one output to false.

b)

It reverses all the outputs, changes 0 --> 1 and 1 -->0.

c)

It makes all inputs true.

d)

It makes all inputs false.

52.

Which gate outputs true only if the inputs are both true, or both false?

a)

AND

b)

NOR

c)

XNOR

d)

OR

53.

Which 2 gates only have 1 input?

a)

AND

b)

IF

c)

OR

d)

NOT

54.

Write the SOP.

a)

RT + RS

b)

R'T + RS

c)

R'T + RS'

d)

RTS

55.

Write the SOP.

a)

RSU' + S'T'T + R'U + ST

b)

RSU+STU+RU+ST

c)

RSU'+S'T'U+RU

d)

ST+RSU'

56.

Write the SOP.

a)

B+D

b)

B'+D

c)

B+D'

d)

B'+D'

57.

Write the SOP.

a)

FG'+F'G

b)

FG+F'G

c)

FG'+FG

d)

FG

58.

Write the SOP.

a)

W

b)

W'

c)

X

d)

X'

59.

Write the SOP.

a)

A'B+B'C

b)

AB'+BC'

c)

AC+B

d)

AB+B'C

60.

Write the SOP.

a)

0

b)

1

c)

A

d)

B

61.
a)

J

b)

J'

c)

K

d)

K'

62.

Write the SOP.

a)

A'B'C'D+A'BC+BCD'

b)

A'B'C'D+ABC+BCD'

c)

A'B'C'D+A'BC+BCD

d)

A'B'C'D+A'BC

63.

Write the SOP

a)

B'C+A'C

b)

B'C+A'C+AC'

c)

BC+AC

d)

B'C+AC+AC'

64.

Write the SOP.

a)

A'C+B'C

b)

A'C+BC

c)

AC+B'C

d)

AC+BC

65.

Write the SOP.

a)

A'C'+AC

b)

AC

c)

BC+B'C'

d)

C'A+A

66.

Write the SOP.

a)

A

b)

B

c)

A'

d)

B'

67.

Write the SOP.

a)

C

b)

C'

c)

A

d)

B

68.

Write the SOP.

a)

A'C'

b)

B'C

c)

A'C

d)

AC

69.

What unit is used to measure current?

a)

Ohms

b)

Omega

c)

Volts

d)

Amps

70.

What unit is used to measure resistance?

a)

Ohms

b)

Omega

c)

Volts

d)

Amps

71.

What is the current in a circuit with 6 ohms of resistance and a battery containing 24 Volts?

a)

1/4 A

b)

144 A

c)

4 A

d)

0.4 A

72.

What is the resistance of a lightbulb that experiences 9 Volts and 3 amps of current?

a)

1/3 ohms

b)

3 ohms

c)

27 ohms

d)

9 ohms

73.

What is the voltage of a circuit with 4 ohms of resistance and 3 amps of current?

a)

12 V

b)

21 V

c)

4/3 V

d)

3/4 V

74.
What size resistor would produce a 3 Amp current flow with a 12 Volt battery
a)
1 Ohm
b)
3 Ohms
c)
4 Ohms
d)
12 Ohms
75.
What is Resistance?
a)
The flow of electrons
b)
Electric potential difference
c)
A battery
d)
The ability to reduce the flow of electrons
76.
Electricity that flows in a closed path is called a
a)
path
b)
current
c)
circuit
d)
light
77.
What is the Voltage of a circuit that has a resistance of 5 Ω and a current of 2 A?
a)
25 V
b)
10 V
c)
2.5 V
d)
0.4 V
78.
The mathematical relationship among Voltage, Current, and Resistance
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
79.

What is the formula for ohms law?

a)

1+2=3

b)

R X E = I

c)

V =I x R

d)

E= MC squared

80.
How do you calculate voltage?
a)
Current X Resistance
b)
Resistance ÷ Current
c)
Current ÷ Resistance
d)
Measure it with a ruler
81.
What voltage is needed to cause a 2A current flow through a 10Ω resistor?
a)
5V
b)
0.2V
c)
20V
d)
200V
82.
What resistance is needed to cause a 50A current flow because of a 500V battery?
a)
10Ώ
b)
5Ώ
c)
2500Ώ
d)
550Ώ
83.
With the engine running the charging system produces 14.5 Volts what would the current flow be if a resistance of 6 Ohms was present
a)
2.41 Ohms
b)
2.52 Ohms
c)
2.1 Ohms
d)
0.3333 Ohms
84.
The mathematical relationship among Voltage, Current, and Resistance
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
85.
To complete a circuit the switch must be
a)
unattached
b)
open
c)
closed
d)
It depends
86.
The flow of electricity requires a
a)
complete path
b)
incomplete path
c)
insulated current
d)
complex circuit
87.
What is this symbol?
a)
resistor
b)
switch
c)
battery
d)
bulb
88.
This circuit has a 24 volt battery and the resistor is 8 ohms. How many amps are running through the circuit?
a)
3 Amps
b)
192 Amps
c)
2 Amps
d)
4 Amps
89.

RT = ?

a)

3.66 ohms

b)

4.77 ohms

c)

5.88 ohms

d)

11 ohms

90.

RT = ?

a)

4.8 ohms

b)

6.5 ohms

c)

15 ohms

d)

25 ohms

91.

If each resistor is 3 ohms, what is the RT?

a)

3 ohms

b)

1 ohms

c)

6 ohms

d)

9 ohms

92.

R1 = 10 ohms

R2 = 2 ohms

RT = ?

a)

1.67 ohms

b)

3.67 ohms

c)

12 ohms

d)

22 ohms

93.

RT = ?

a)

16.67 ohms

b)

66.67 ohms

c)

96.67 ohms

d)

150 ohms

94.

The method to solve for this scenario is known as the...

a)

Product Over Sum Method

b)

Reciprocal Method

c)

Value Over Number Method

d)

Scientific Method

95.

R1 = 40 ohms

R2 = 40 ohms

RT = ?

a)

2 ohms

b)

20 ohms

c)

10 ohms

d)

5 ohms

96.

R1 = 10K ohms

R2 = 1K ohms

a)

408.7 ohms

b)

909.1 ohms

c)

1.5K ohms

d)

11K ohms

97.

Of the three scenarios you could encounter regarding resistors in parallel, which one uses the reciprocal method?

a)

Multiple resistors that are all the same value

b)

Three or more resistors of different value

c)

Two resistors of unequal value

98.

Of the three scenarios you could encounter regarding resistors in parallel, which one uses the product over sum method?

a)

Multiple resistors that are all the same value

b)

Three or more resistors of unequal value

c)

Two resistors of unequal value

99.

Of the three scenarios you could encounter regarding resistors in parallel, which one solves RT by dividing the value of one resistor by the number of resistors in parallel?

a)

Multiple resistors that are all the same value

b)

Three or more resistors of unequal value

c)

Two resistors of unequal value

100.

The binary for 15 is

a)

111

b)

1111

c)

1100

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